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48
PROTON STRUCTURE FOR LHC DISCOVERIES STEFANO FORTE UNIVERSIT ` A DI MILANO & INFN HIGGS-MAXWELL MEETING EDINBURGH,FEBRUARY 8, 2012
Transcript
Page 1: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

PROTONSTRUCTURE

FORLHC

DISCOVERIES

STEFANOFORTE

UNIV

ERSITA

DIM

ILANO&

INFN

HIG

GS­M

AXWELL

MEETIN

GEDIN

BURGH,FEBRUARY8,2012

Page 2: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

DIS

COVERY

AT

THES

p

�p

SAND

AT

THELHC

DIS

COVERYOFTHE

W

(1984)

pT

distribution

ofthe

e

and

from

W

de ay

at

U

A

1

(1984)

DIS

COVERYOFTHE

HIG

GS(2011?)

[GeV

]4l

m

100

120

140

160

180

200

220

240

Events / 5 GeV

024681012-1

Ldt

= 4

.8 fb

∫ =

7 T

eV,

sD

ata

2011

,

AT

LA

SP

relim

inar

yD

ata =13

0 G

eV, 1

xSM

Hm To

tal b

ackg

roun

d 4l→

(*)

ZZ

→H

transverse

energy

distribution

in

the

four

lepton

hannelat

A

T

LA

S

(2011)

HADRON

COLLID

ER

CIR

CA1985

)“C

LEAN”DISCOVERY

SIG

NAL

HADRON

COLLID

ER

CIR

CA2010

)

PRECISIO

NPHYSIC

S

$

NEW

PHYSIC

S

Page 3: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

PDFS

FROM

THES

p

�p

STO

THELHC

PDFS

IN1984

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VSD

UKE­O

WENS

PDFS

IN2011

GLUON­G

LUON

LUMI

1/2

/ S

)S

( -3

10-2

10-1

10

G-G Lumi

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0.95

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1

1.151.2

LHC

7 T

eV

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PD

F2.

1N

NP

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=0.1

19s

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ST

W08

-

LHC

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eV

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x0.

10.

20.

30.

40.

50.

60.

70.

80.

91

)0

2 (x, Q S ∆ -0

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0.04

0.06

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1

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PD

F2.

1

CT

10

MS

TW

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VSMSTW

VSCTEQ,2011

HADRON

COLLID

ERS

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QUALITATIV

EQCD:DIS

COVERY

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S

DIS

ATNMC

ANDHERA1995­2

005

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ION

PHYSIC

S

HADRON

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ERS

CIR

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)

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$

NEW

PHYSIC

S

Page 4: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

SUMMARY

PROTON

STRUCTURE

TODAY

{

PDFS,LUMIN

OSITIE

S,STANDARD

CANDLES

{

RECENT

PROGRESS

ATNLO

ANDNNLO

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{

THE

MEANIN

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S

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ER

DATA

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ANDZ

PRECISIO

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LHC

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COLLID

ER

ONLYPDFS

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THE

ROLE

OF

THELHC

DATA

AROAD

MAPFOR

THE

FUTURE

Page 5: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

THE

STATE

OFTHE

ART

Page 6: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

CURRENTPDFSETS

�X

(s;M

2 X

)=

P a;b

R 1 xm

in

dx1dx2fa=h1(x1)fb=h2(x2)^�qaqb!

X

� x1x2s;M

2 X

data

in

global�ts

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/ M2

Q

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100

101

102

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104

105

106

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108

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± y)

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arto

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nem

atic

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10

GeV

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100

GeV

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1 T

eV

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10

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66

y =

40

22

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2)

x

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VALUES,VFN

NNPDF2.1­2

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s

VALS.,VFN

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+SOMEDY,NLO+NNLO,SIN

GLE

s

VALUE,FFN

HERAPDF1.0

(1.5?):

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,NLO+NNLO,SEVERAL

s

VALS,VFN

SETS

BASED

ON

MODEL

ASSUMPTIO

NS(G

RV/GJR,STATIS

TIC

ALPDFS,...)

Page 7: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

FEATURES,TRADEOFFSAND

CHOIC

ES

DATASET:CTEQ,MSTW,NNPDF

FIX

ED

TARGET+

COLLID

ER,

eP

AND

� P

PDATA

(NNPDF:LHC);ABKM,GJR

GLOBALDIS

+FIX

ET­T

ARGETDY;HERAPDF:

HERADIS

ONLY

STATISTIC

AL

TREATMENT:CTEQ,MSTW

HESSIA

NWITH

DYNAMIC

AL

TOLERANCE;HERAPDF,STANDARDH

ESSIA

N+PARM.ERROR

ANALYSIS;GJR,

HESSIA

NWITH

FIX

ED

TOLERANCE;ABKM

STANDARDH

ESSIA

N;NNPDFM

ONTE

CARLO(A

LSO

STUDIE

DBYHERAPDF,MSTW)

PARTON

PARAMETRIZATIO

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x�(1

x)��

POLYNOMIA

LS;GJR:DITTO+

VALENCELIK

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NETS;

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s

VALUE:CTEQ,NNPDF:EXTERNALPARAMETER,SEVERALVALUES

AVAILABLE;

MSTW:FITTED,BUT

ALSO

VARIA

BLE

AS

EXT.P

ARAMETER;ABKM,GJR:FITTED,

NOT

VARIA

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AS

EXT.PARAMETER

PERTURBATIV

EORDER:CTEQ:LO+NLO;MSTW:LO+NLO+NNLO;NNPDF

LO+NLO+NNLO;ABKM,HERAPDF,GJR:NLO+NNLO

HEAVY

QUARKS:CTEQ:GM­V

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SCHEME);MSTW:GM­V

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(ACOT+TR’SCHEME);NNPDF:GM­V

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(FONLL

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Page 8: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

WHERE

DO

WE

STAND?

LHC

STANDARD

CANDLES(N

LO)

W

+

)2 Z

(MSα

0.11

40.

116

0.11

80.

120.

122

0.12

4

) (nb) ν+

l → +

B(W ⋅ +Wσ

5.4

5.6

5.86

6.2

6.4

68%

C.L

. PD

F

MS

TW

08

CT

EQ

6.6

CT

10

NN

PD

F2.

1

HE

RA

PD

F1.

0

HE

RA

PD

F1.

5

AB

KM

09

GJR

08

= 7

TeV

)s

at t

he L

HC

(ν+ l

→ +N

LO W

Out

er: P

DF

+In

ner:

PD

F o

nly

Ver

tical

err

or b

ars

G. Watt (September 2011)

)2 Z

(MSα

0.11

40.

116

0.11

80.

120.

122

0.12

4

) (nb) ν+

l → +

B(W ⋅ +Wσ

5.4

5.6

5.86

6.2

6.4

W

)2 Z

(MSα

0.11

40.

116

0.11

80.

120.

122

0.12

4

) (nb) ν-

l → -

B(W ⋅ - Wσ

3.7

3.8

3.94

4.1

4.2

4.3

4.4

4.5

68%

C.L

. PD

F

MS

TW

08

CT

EQ

6.6

CT

10

NN

PD

F2.

1

HE

RA

PD

F1.

0

HE

RA

PD

F1.

5

AB

KM

09

GJR

08

= 7

TeV

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at t

he L

HC

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LO W

Out

er: P

DF

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ner:

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Ver

tical

err

or b

ars

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(MSα

0.11

40.

116

0.11

80.

120.

122

0.12

4

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l → -

B(W ⋅ - Wσ

3.7

3.8

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4.1

4.2

4.3

4.4

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TOP

Z

)2 Z

(MSα

0.11

40.

116

0.11

80.

120.

122

0.12

4

) (nb)-l

+ l →

0 B(Z ⋅ 0

Z σ

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68%

C.L

. PD

F

MS

TW

08

CT

EQ

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CT

10

NN

PD

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HE

RA

PD

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RA

PD

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5

AB

KM

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GJR

08

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at t

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HC

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LO Z

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er: P

DF

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ner:

PD

F o

nly

Ver

tical

err

or b

ars

G. Watt (September 2011)

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(MSα

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116

0.11

80.

120.

122

0.12

4

) (nb)-l

+ l →

0 B(Z ⋅ 0

Z σ

0.84

0.86

0.880.9

0.92

0.94

0.96

0.98

1

(G

.W

att,2011)

GLOBAL

FITS

INGOOD

MUTUALAGREEMENT

CHOIC

EOF

s

VALUE

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RECOMMENDATIO

N:ENVELOPE

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Page 9: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

WHERE

DO

WE

STAND?

PARTON

LUMIN

OSITIE

S(N

LO)

GLUON­G

LUON

QUARK­Q

UARK

(G

.W

att,2011)

QUARK­G

LUON

1/2

/ S

)S

( -3

10-2

10-1

10

Q-Qbar Lumi

0.8

0.850.9

0.95

1

1.051.

1

1.151.2

LHC

7 T

eV

NN

PD

F2.

1N

NP

DF

2.0 =0

.119

CT

10 -

=0.1

19s

αM

ST

W08

-

LHC

7 T

eV

CHARM­C

HARM

1/2

/ S

)S

( -3

10-2

10-1

10

C-Cbar Lumi

0.8

0.850.9

0.95

1

1.051.

1

1.151.2

LHC

7 T

eV

NN

PD

F2.

1N

NP

DF

2.0 =0

.119

CT

10 -

=0.1

19s

αM

ST

W08

-

LHC

7 T

eV

(N

N

PD

F,2011)

Page 10: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

CONTIN

UOUSPROGRESS

PARTON

LUMIN

OSITIE

S(N

LO)

GLUON­G

LUON

2010

2011

QUARK­Q

UARK

2010

2011

(G

.W

att,2011)

NNPDF2.0

!

NNPDF2.1:IN

CLUSIO

NOFHW

MASSES

CTEQ6.6

!

CT10:IM

PROVED

STATIS

TIC

S,PARAMETRIZATIO

N,DATA

CONSID

ERABLY

IMPROVED

AGREEMENT!

Page 11: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

CONTIN

UOUSPROGRESS

PARTON

LUMIN

OSITIE

S(N

NLO)

GLUON­G

LUON

N

N

P

D

F

N

LO

vs.

N

N

LO

1/2

/ S

)2 X

( M

-210

-110

G-G Lumi 0.8

0.850.9

0.95

1

1.051.

1

1.151.2

1.251.3

PD

F U

ncer

tain

ty p

arto

n lu

mis

- L

HC

7 T

eV -

Rat

io to

NN

PD

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1 N

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PD

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ncer

tain

ty p

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n lu

mis

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HC

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eV -

Rat

io to

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1 N

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N

N

LO

N

N

P

D

F

2.1

vs.

M

ST

W

08

1/2

/ S

)2 X

( M

-310

-210

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G-G Lumi 0.8

0.850.9

0.95

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1

1.151.2

1.251.3

PD

F U

ncer

tain

ty p

arto

n lu

mis

- L

HC

7 T

eV -

Rat

io to

NN

PD

F2.

1 N

NLO

NN

PD

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1 N

NLO

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TW

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NLO

PD

F U

ncer

tain

ty p

arto

n lu

mis

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HC

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eV -

Rat

io to

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F

N

LO

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LO

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-210

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NNPDF2.1

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Page 12: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

CONTIN

UOUSPROGRESS

THE

HIG

GS

CROSS

SECTIO

N

m

H

=

120

GEV:2010

m

H

=

120

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(G

.W

att)

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GSWG

NLO

2010

[GeV

]H

M

100

150

200

250

300

350

400

450

500

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LHC HIGGS XS WG 2010

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rmal

ized

to M

ST

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rent

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ues

of

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erta

intie

ss

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act P

DF

+

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HC

rec

ipe

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0

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EQ

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MS

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o

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2011

ENVELOPE(W

ATT)

NNLO

2011

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NPDF)

( G

eV )

HM

100

150

200

250

300

350

400

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0.750.8

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NN

PD

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1 N

NLO

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1 N

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(no

NM

C)

NN

PD

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1 N

NLO

(N

MC

p S

Fs)

)=0.

119

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eV, R

atio

to N

NP

DF

2.1

NN

LO

( G

eV )

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100

150

200

250

300

350

400

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0.750.8

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0.95

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)=0.

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Z(M sα

NN

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NN

PD

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AB

KM

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!

2011

IMPROVED

AGREEMENT

OF

GLOBAL

FITS

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NPDF

AGREEMENT

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Page 13: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

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Page 14: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

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Page 15: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

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THEYHAVE

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Page 16: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

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Page 17: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

DATACONSISTENCY:WHYWE

NEED

IT

DIS

ONLY

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)

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NIFIC

ANT

LOSS

IN

ACCURACY

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x

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JETS!

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Page 18: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

DATACONSISTENCY:HOW

TO

TESTFOR

IT

INCONSISTENT

DATA

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ATED

UNCERTAIN

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Page 19: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

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Page 20: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

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Page 21: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

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Page 22: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

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Page 23: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

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Page 24: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

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Page 25: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

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Page 26: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

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THENNPDF2.1

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Page 27: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

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Page 28: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

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Page 29: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

W

AND

Z

PRODUCTIO

NAT

THELHC

FITTIN

GTHEATLAS

DATA

lη0

0.5

11.

52

2.5

( pb )l η ) / d

+ ( W σd

500

520

540

560

580

600

620

640

660

680

700

NN

PD

F2.

1 N

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+ D

YN

NLO

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1

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NP

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2.1

+ A

TLA

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6 pb

Dat

a-1

36

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LAS

W

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YN

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11.

52

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3

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405060708090

100

110

120

130

140

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1 N

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YN

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1

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NP

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TLA

S W

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6 pb

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a-1

AT

LAS

Z 3

6 pb

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PD

F2.

1 N

NLO

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YN

NLO

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ON

LIG

HT

QUARKPDFS

DOWN

x-4

10-3

10-2

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10

R [ xd ] 0.850.9

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1

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, rat

io to

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PD

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eV4

= 1

02

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a-1

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1 N

NLO

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TLA

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6 pb

, rat

io to

NN

PD

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1 N

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eV4

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P

x-4

10-3

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R [ xubar ] 0.850.9

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, rat

io to

NN

PD

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NLO

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eV4

= 1

02

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PD

F2.

1 N

NLO

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a-1

NN

PD

F2.

1 N

NLO

+ A

TLA

S W

,Z 3

6 pb

, rat

io to

NN

PD

F2.

1 N

NLO

2 G

eV4

= 1

02

Q

(N

N

PD

F,2012

prelim

.)

SIG

NIFIC

ANT

IMPACT

ON

THE

SHAPE

SIZABLE

REDUCTIO

NOF

THE

UNCERTAIN

TY

Page 30: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

W

+

PRODUCTIO

NAT

THELHC

STRANGENESS

PROBED

DI­

RECTLY

MIG

HT

REPLACE

NEUTRIN

ODATA

THECMS

MEASUREMENT

R

�(W

+

+� )

�(W

+ )

;

R

�(W

+ )

�(W

+jets)

R

=

0:92

0:19stat.�

0:04syst.

R

=

0:143

0:015stat.�

0:024syst.

R

DATA

VS

TH.

R

DATA

VS

TH.

TOTAL

STRANGENESS

x0.

10.

20.

30.

40.

50.

60.

70.

80.

91

)0

2 (x, Q + xs

0

0.050.

1

0.150.2

0.25

NN

PD

F2.

1

CT

10

MS

TW

08

DIFFERENCES

BETWEEN

AVAILABLE

SETS

SIZABLE

DATA

STILLTOO

IMPRECIS

E,BUT...

Page 31: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

W

+

PRODUCTIO

NAT

THELHC

SIM

ULATED

MEASUREMENT

OF

RAPID

ITY

DISTRIB

UTIO

NWITH

AMC@NLO

(J.R

ojo,S.Frixione,M

.M

angano,2012,prelim

.)

CMS

KIN

EMATIC

S

pjet

T

>

20

G

eV

,

p� T

>

25

G

eV

�jet;

��

<

2:1

15%

CHARM

TAGGIN

GEFFIC

IENCY(C

MS)

CURRENTLY36

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1

,BUT5

FB

1

SUFFIC

IENT

THE

IMPACT

ON

STRANGENESS

INTHENNPDF2.1

FIT

INTHE

COLLID

ER­O

NLY

FIT

IMPACT

SIG

NIFIC

ANT

EVEN

ON

CURRENT

GLOBAL

FIT

COULD

DO

WITHOUT

NEUTRIN

ODATA

Page 32: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

PROMPT

PHOTON

PRODUCTIO

N

(D

.d'Enterria,J.R

ojo,2012,prelim

.)

DIR

ECTPROBE

OFTHE

qg

LUMIN

OSITY

MEASURED

BYCMS+ATLAS

xt

=

x1x2

RANGE

Tx-3

10-2

10-1

101

data / NLO

0

0.51

1.52

2.5

pro

duct

ion:

γIs

olat

ed

= 2

.76,

7 T

eVs

LHC

pp,

= 1

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.96

TeV

s, p

Teva

tron

p

= 5

46, 6

30 G

eVs

, pS

,Tev

atro

n p

pS

p

= 2

00 G

eVs

RH

IC p

p,

JET

PH

OX

1.3

γ T =

pR

,F,F

FµN

NP

DF

2.1

THE

IMPACT

OFLHC

PROMPT

PHOTON

DATA

GLUON

x-3

10-2

10-1

10

Ratio of Gluon PDFs 0.850.9

0.95

1

1.051.

1

1.151.2

2 =

10

GeV

2 Q

NN

PD

F2.

1 N

LO

NN

PD

F2.

1 N

LO +

LH

C7

IsoP

hoto

ns

2 =

10

GeV

2 Q

HIG

GS

FROM

GLUON

FUSIO

N

( G

eV )

HM

150

200

250

300

350

400

450

500

Ratio to NNPDF2.1

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1

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gs g

gF N

LO c

ross

sec

tion

(MC

FM

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PD

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1 +

LH

C Is

oPho

tons

Hig

gs g

gF N

LO c

ross

sec

tion

(MC

FM

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MODERATE

IMPACT

ON

GLOBAL

FIT

(BUT

COULD

RESOLVE

DIS

CREPANCIE

S)

SUFFIC

IENT

TO

AFFECT

HIG

GS

CROSS

SECTIO

N

Page 33: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

OUTLOOK

Page 34: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

WIS

HLIS

T

,

ROADMAP

PRECISIO

NLHC

PHYSIC

SMUST

USE

PRECISELHC

DATA

A“C

OLLID

ER

ONLY”HERA+LHC

PDF

FIT

(TEVATRON

DATA

MIG

HT

BE

SUPERFLUOUS)

{

MEDIU

M&

LARGE

x

GLUON

PROMPT

PHOTONS

(PRECIS

ION)JETS

INCLUSIV

E

W

pT

DIS

TRIB

UTIO

NS

{

LIG

HT

FLAVOR

SEPARATIO

N

LOW–MASSDRELL­Y

AN

HIG

H–MASSDRELL­Y

AN

Z

RAPID

ITY

DIS

TRIB

UTIO

NS

W

ASYMMETRIE

S

{

STRANGENES&

HEAVY

FLAVORS

STRANGENESS

)

W

+

CHARM

)

Z

+

,

+

BOTTOM

Z

+

b

MOST

OF

THESE

ALREADY

AVAILABLE(A

TLEAST

INPRELIM

.FORM)

ATLAS

JETS

AND

W

,Z

RAP.DISTNS.FULLY

AVAILABLE(36

PB

1

)

Page 35: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

FOR

DIS

COVERY,WE

NEED

TO

TRUST

OUR

SIG

NAL!

Page 36: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

EXTRAS

Page 37: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

NMC

DATA:A

PROBLEM?

NMC

PROTON

AND

DEUTERON

DATA

FORDIS

F

2

STRUCTURE

FUNCTIO

N

F

2

STRUCTURE

FUNCTIO

NDATA

USED

INMSTW,CTEQ,NNPDF

FITS,

WOULD

THE

USE

OF

CROSS

SECTIO

NDATA

MAKE

ADIFFERENCE?

(A

lekhin,

B

l�um

lein,

M

o h,

2011)

e�(x;y;Q2 )=F 2(x;Q

2)

� 2

2y

+

y2=[1

+

R

(x;Q

2)℄

(N

LO

:arXiv:1102.3182;N

N

LO

:prelim

inary)

Page 38: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

NMC

DATA:A

PROBLEM?

NMC

PROTON

AND

DEUTERON

DATA

FORDIS

F

2

STRUCTURE

FUNCTIO

N

F

2

STRUCTURE

FUNCTIO

NDATA

USED

INMSTW,CTEQ,NNPDF

FITS,

WOULD

THE

USE

OF

CROSS

SECTIO

NDATA

MAKE

ADIFFERENCE?

(A

lekhin,

B

l�um

lein,

M

o h,

2011)

e�(x;y;Q2 )=F 2(x;Q

2)

� 2

2y

+

y2=[1

+

R

(x;Q

2)℄

�NNPDF

FIT

REPEATED

WITHNMC

XSECT

OR

NONMC

(N

LO

:arXiv:1102.3182;N

N

LO

:prelim

inary)

EFFECT

ON

GLUON

x-4

10-3

10-2

10-1

10

)]2

R[g (x, Q 0.850.9

0.95

1

1.051.

1

1.151.2

1.25

2 G

eV4

= 1

02

Rat

io to

NN

PD

F2.

1, Q

NN

PD

F2.

1

NN

PD

F2.

1-N

MC

xsec

NN

PD

F2.

1-no

NM

C

2 G

eV4

= 1

02

Rat

io to

NN

PD

F2.

1, Q

EFFECT

ONHIG

GS

XSECT

[ G

eV ]

HM

100

120

140

160

180

200

220

240

260

280

300

320

( H -> gg ) ) σ R (

0.9

0.95

1

1.051.

1

1.15

NN

LO g

g->H

pro

duct

ion,

Rat

io to

NN

PD

F2.

5 (T

MP

)

NN

PD

F2.

5 N

NLO

(TM

P)

NM

C-X

SE

C

NN

PD

F2.

5 N

NLO

(TM

P)

NM

C S

F

NN

LO g

g->H

pro

duct

ion,

Rat

io to

NN

PD

F2.

5 (T

MP

)

NO

SIG

NIFIC

ANTCHANGE

OBSERVED

Page 39: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

NMC

DATA:A

PROBLEM?

ACLOSER

LOOK

ALEKHIN

ET

AL.SEE

LARGE

SHIFT

INBEST­F

IT

s

:FROM

0.1170(N

MC

F

2

)TO

0.1135(N

MC

s

)

HOW

MUCH

OF

THEIR

CHANGE

INH

IGGS

XSECT(�

8%

)DUE

TO

CHANGE

IN

s

?

BASED

ON

POWER

COUNTIN

G,EXPECT

2:8�

s

=

8%

(!)

EITHER

REMOVENMC

DATA,OR

CHANGE

VALUE

OF

s

INMSTW

FIT

(Thorne,presented

by

W

att

at

P

D

F

4LH

C

2011

):

{ {

s

{

s

=

0:113

Page 40: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

NMC

DATA:A

PROBLEM?

ACLOSER

LOOK

ALEKHIN

ET

AL.SEE

LARGE

SHIFT

INBEST­F

IT

s

:FROM

0.1170(N

MC

F

2

)TO

0.1135(N

MC

s

)

HOW

MUCH

OF

THEIR

CHANGE

INH

IGGS

XSECT(�

8%

)DUE

TO

CHANGE

IN

s

?

BASED

ON

POWER

COUNTIN

G,EXPECT

2:8�

s

=

8%

(!)

EITHER

REMOVENMC

DATA,OR

CHANGE

VALUE

OF

s

INMSTW

FIT

(Thorne,presented

by

W

att

at

P

D

F

4LH

C

2011

):

{

IMPACT

OFNMC

DATA

NEGLIG

IBLE

{

IMPACT

OF

s

VALUE

COMPARABLE(S

OMEWHAT

SMALLER)TO

WHOLEABKM

EFFECT

{

MSTW

ANDABKM

RESULTS

STILL

QUITE

DIFFERENT

EVEN

FOR

SAME

s

=

0:113

Page 41: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

THE

VALUE

OF

s

DEDIC

ATEDM

UNIC

HMEETIN

G(F

EB2011):

S.BETHKE

PROPOSES

TWO

UPDATED

VALUES:

{

(1)

s

=

0:1174

0:0011

{

(2)

s

=

0:1187

0:0006

{

BOTH

INCLUDE

NEW

VALUE

FROM

DECAYS

s

=

0:1213

0:0014

(WAS

s

=

0:1197

0:0016

)

{

VALUE(1)ALSO

INCLUDES

NEW

SCET

VALUE

FROM

e+

e�

THRUST

(A

bbate

et

al.,2010)

s

=

0:1135

0:0010

,BUT

ALL

UNCERTAIN

TIE

SRESCALED

BY

FACTOR2

{

VALUE(2)EXCLUDES

IT

AVERAGIN

GTHE

TWO

MOST

RELIA

BLE

VALUES(G

LOBALEW

FIT

&

,BOTH

N

3

LO,NO

DEP.ON

HADRON

STRUCTURE)GIV

ES

s

=

0:1209

0:0013

0

:0

0

2

Page 42: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

THE

VALUE

OF

s

DEDIC

ATEDM

UNIC

HMEETIN

G(F

EB2011):

S.BETHKE

PROPOSES

TWO

UPDATED

VALUES:

{

(1)

s

=

0:1174

0:0011

{

(2)

s

=

0:1187

0:0006

{

BOTH

INCLUDE

NEW

VALUE

FROM

DECAYS

s

=

0:1213

0:0014

(WAS

s

=

0:1197

0:0016

)

{

VALUE(1)ALSO

INCLUDES

NEW

SCET

VALUE

FROM

e+

e�

THRUST

(A

bbate

et

al.,2010)

s

=

0:1135

0:0010

,BUT

ALL

UNCERTAIN

TIE

SRESCALED

BY

FACTOR2

{

VALUE(2)EXCLUDES

IT

AVERAGIN

GTHE

TWO

MOST

RELIA

BLE

VALUES(G

LOBALEW

FIT

&

,BOTH

N

3

LO,NO

DEP.ON

HADRON

STRUCTURE)GIV

ES

s

=

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TY

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0

:0

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2

QUITE

UNLIK

ELY

Page 43: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

METHODOLOGY:“S

TANDARD”(H

ESSIA

N)APPROACH

THE

TOLERANCE

PROBLEM

CHOOSE

AFIX

ED

FUNCTIO

NAL

FORM

(�25

30

PARMS.GLOBALLY)AND

FIT

PARMS

TO

DATA

UNCERTAIN

TIE

SDETERMIN

ED

FROM

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NMATRIX

AT

MIN

IMUM

STANDARD

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ENVELOPE

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TIE

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ENTS

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AL

)

SEPARATELY

DETERMIN

ED

FOR

EACH

HESSIA

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ENVECTOR

Page 44: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

MIN

IMUM

�2 i

VS

GLOBAL

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ollins,Pum

plin

2001

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Xµµ →Nν CCFR

Xµµ →Nν NuTeV NCr σ H1 ep 97-00 NCr σ ZEUS ep 95-00 CCr σ H1 ep 99-00 CCr σ ZEUS ep 99-00

charm

2 H1/ZEUS ep FH1 ep 99-00 incl. jets

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asym. νl → II W ∅ D

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CDF II Z rap.

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Xµµ →Nν NuTeV NCr σ H1 ep 97-00 NCr σ ZEUS ep 95-00 CCr σ H1 ep 99-00 CCr σ ZEUS ep 99-00

charm

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global2

χ∆ Distance =

-20

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68%

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1112

1314

1516

1718

1920

12

34

56

78

910

1112

1314

1516

1718

1920

global2

χ∆ Tolerance T =

-20

-15

-10-505101520

(M

RS

T)

50+

(M

RS

T)

50-

(C

TE

Q)

100

+

(C

TE

Q)

100

-

NCr σ H1 ep 97-00

NCr σ H1 ep 97-00

2 d F µ NMC Xµµ →Nν NuTeV

Xµµ →Nν NuTeV Xµµ →Nν CCFR

E866/NuSea pd/pp DY E866/NuSea pd/pp DY

Xµµ →Nν NuTeV 3 N xF ν NuTeV

Xµµ →Nν NuTeV Xµµ →Nν NuTeV

asym. νl → II W ∅ D 2 d F µ BCDMS

2 d F µ BCDMS 2 p F µ BCDMS

NCr σ H1 ep 97-00

NCr σ ZEUS ep 95-00

2 d F µ BCDMS 2 SLAC ed F

NCr σ H1 ep 97-00

NCr σ ZEUS ep 95-00

E866/NuSea pd/pp DY E866/NuSea pd/pp DY

E866/NuSea pp DY 3 N xF ν NuTeV

2 d F µ NMC asym. νl → II W ∅ D

NCr σ H1 ep 97-00 2 N F ν NuTeV

Xµµ →Nν CCFR E866/NuSea pd/pp DY

Xµµ →Nν NuTeV Xµµ →Nν CCFR

asym. νl → II W ∅ D E866/NuSea pd/pp DY

NCr σ H1 ep 97-00

NCr σ H1 ep 97-00

3 N xF ν NuTeV Xµµ →Nν NuTeV

MS

TW

200

8 N

LO P

DF

fit

Page 45: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

METHODOLOGY:NNPDF

APPROACH

BASIC

IDEA:MONTE

CARLO

SAMPLIN

G

OF

THE

PROBABILITY

MEASURE

INTHE(F

UNCTIO

N)SPACE

OFPDFS

START

FROM

MONTE

CARLO

SAMPLIN

GOF

DATA

SPACE

EACH

PDF

$

NEURAL

NETWORK

PARAMETRIZED

BY37

PARAMETERS( N

NPDF2.0:

37

7

=

259

PARMS)

“INFIN

ITE”NUMBER

OF

PARAMETERS

)

CAN

REP­

RESENT

ANY

FUNCTIO

N

FIT

STOPS

WHEN

QUALITY

OF

FIT

TO

RAN­

DOMLY

SELECTED

“VALID

ATIO

N”

DATA(N

OT

FIT­

TED)STOPS

IMPROVIN

G

Experimental Data

MC generation

NN parametrization

Fi i=1,...,Ndata

NMC,BCDMS,SLAC,HERA,CHORUS...

Fi(1)

Fi(2)

Fi(N)

Fi(N-1)

q0net(1)

q0net(2)

q0net(N-1)q0net(N)

REPRESENTATION OF

PROBABILITY DENSITY

EVOLUTION

TRAINING

Page 46: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

METHODOLOGY:NNPDF

APPROACH

BASIC

IDEA:MONTE

CARLO

SAMPLIN

G

OF

THE

PROBABILITY

MEASURE

INTHE(F

UNCTIO

N)SPACE

OFPDFS

START

FROM

MONTE

CARLO

SAMPLIN

GOF

DATA

SPACE

EACH

PDF

$

NEURAL

NETWORK

PARAMETRIZED

BY37

PARAMETERS( N

NPDF2.0:

37

7

=

259

PARMS)

“INFIN

ITE”NUMBER

OF

PARAMETERS

)

CAN

REP­

RESENT

ANY

FUNCTIO

N

FIT

STOPS

WHEN

QUALITY

OF

FIT

TO

RAN­

DOMLY

SELECTED

“VALID

ATIO

N”

DATA(N

OT

FIT­

TED)STOPS

IMPROVIN

G

CAN

DETERMIN

EBOTH

68C.L.&

1­�

x-5

10-4

10-3

10-2

10-1

10

)0

2xg (x, Q

-3-2-1012345N

NP

DF

2.0

- 68

% C

L

σN

NP

DF

2.0

- 1-

Indi

vidu

al R

eplic

as

Page 47: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

BEYOND

DGLAP?

DIS

COVERIN

GA

NEW

QCD

EFFECTIN

HERA

DATA

IDEA:

(G

�elis,2008,)

C

aola,s.f.

,R

ojo

2010)

CUT

OUT

DATA

INTHE“D

ANGEROUS”(S

MALL

x

)

REGIO

N

DETERMIN

EPDFS

INTHE“S

AFE”

(LARGE

x

AND

Q

2

)REGIO

N

EVOLVE

BACKWARDS

AND

COMPARE

TO

DATA

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xxxxxxxxxx

xxxxxxxxxx

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xxxxxx

xxxxxx

xxxxxx

xxxxxx

� �

x

Q

2

x

Q

2

Page 48: TRUCTURE DISCOVERIES , F · CONTINUOUS PROGRESS PARTON LUMINOSITIES (NNLO) GLUON GLUON NNPDF NLO vs. NNLO 1/2 / S ) 2 X ( M-2 10-1 10 G-G Lumi PDF Uncertainty parton lumis - LHC 7

BEYOND

DGLAP?

DIS

COVERIN

GA

NEW

QCD

EFFECTIN

HERA

DATA

IDEA:

(G

�elis,2008,)

C

aola,s.f.

,R

ojo

2010)

CUT

OUT

DATA

INTHE“D

ANGEROUS”(S

MALL

x

)

REGIO

N

DETERMIN

EPDFS

INTHE“S

AFE”

(LARGE

x

AND

Q

2

)REGIO

N

EVOLVE

BACKWARDS

AND

COMPARE

TO

DATA

OLD

HERADATA

BACKWARD

EV.VS

DATA

x

-41

0-3

10

-21

0

)2

=3.5 GeV2

(x,Q 2 F

0.2

0.4

0.6

0.81

1.2

1.4

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