AStudyofOpenCharmProduc5on Heavy Flavor …...David"Tlusty RHIC/AGS"Annual"Users’"Mee5ng"2015...

A Study of Open Charm Produc5on in p+p Collisions at STAR

David TlustyNuclear Physics Ins5tute AS CR

Czech Technical University Prague

ICHEP 14, 04/07/2014 Heavy Flavor at STAR, R. Vértesi 1

Heavy Flavor Measurements at STAR

Nuclear Physics Institute Academy of Sciences of the Czech Republic

Róbert Vértesi

[email protected] .

for the

collaboration

l+

i_l

D0

_K /+

D0

cc

9.6%

3.89%

56.5%

56.5%

_

K

David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015

Introduc5on

2


1. Open heavy flavor

Open Charm Production – D* Reconstruction -

9

)2) (GeV/c/)-M(K//M(K0.14 0.145 0.15 0.155 0.16 0.165

Cou

nts

0

500

1000

1500

2000

2500

right sign

wrong sign

side band

)2) (GeV/c/M(K1.7 1.75 1.8 1.85 1.9 1.95 2 2.05

Cou

nts

0

200

400

600

800

1000

1200

1400

1600

1800

2000

candidates0 D

side band

dE/d

x/

mn

-5

0

5

10 (a)pK

/

edE

/dx

Kmn

-5

0

5

10 (b)

K

p

/

Momentum (GeV/c)0 1 2 3 4 5

TOF

Kmn

-20

-10

0

10(c)

K

/

p

D0

K- π+

D*+

π+

p+p 200 GeV

Quark Matter 2014, Zhenyu Ye STAR: PRD 86, 072013 (2012)

!  Heavy quarks c, b !  Produced in initial hard processes !  Probe the strongly interacting Quark–Gluon Plasma !  Modified spectrum: access parton energy loss !  Flow: sensitive to dynamics, thermalization

!  Semi-leptonic decays !  Higher branching ratio, easy to trigger on !  Indirect access to kinematics,

mixture of c and b contributions

!  Hadronic reconstruction !  Direct access to kinematics !  Large combinatorial bg., difficult to trigger

April 8, 2014 WWND

Heavy quarks

✓ c and b quarks are produced in initial hard scattering

3

• Degree of medium thermalization – production and elliptic 4ow sensitive to dynamics of the medium

• Parton energy loss mechanism

• Cross-sections calculable within pQCD

• Unique probes of QGP properties

★Heavy Quarks c, b★produced in ini5al hard processes★produc5on well described by pQCD ★excellent probe of the strongly interac5ng Quark-‐Gluon Plasma

l+

i_l

D0

_K /+

D0

cc

9.6%

3.89%

56.5%

56.5%

_

K


Introduc5on

«Direct reconstruc5on of open charm mesons

2


1. Open heavy flavor

Open Charm Production – D* Reconstruction -

9

)2) (GeV/c/)-M(K//M(K0.14 0.145 0.15 0.155 0.16 0.165

Cou

nts

0

500

1000

1500

2000

2500

right sign

wrong sign

side band

)2) (GeV/c/M(K1.7 1.75 1.8 1.85 1.9 1.95 2 2.05

Cou

nts

0

200

400

600

800

1000

1200

1400

1600

1800

2000

candidates0 D

side band

dE/d

x/

mn

-5

0

5

10 (a)pK

/

edE

/dx

Kmn

-5

0

5

10 (b)

K

p

/

Momentum (GeV/c)0 1 2 3 4 5

TOF

Kmn

-20

-10

0

10(c)

K

/

p

D0

K- π+

D*+

π+

p+p 200 GeV

Quark Matter 2014, Zhenyu Ye STAR: PRD 86, 072013 (2012)

!  Heavy quarks c, b !  Produced in initial hard processes !  Probe the strongly interacting Quark–Gluon Plasma !  Modified spectrum: access parton energy loss !  Flow: sensitive to dynamics, thermalization

!  Semi-leptonic decays !  Higher branching ratio, easy to trigger on !  Indirect access to kinematics,

mixture of c and b contributions

!  Hadronic reconstruction !  Direct access to kinematics !  Large combinatorial bg., difficult to trigger

April 8, 2014 WWND

Heavy quarks

✓ c and b quarks are produced in initial hard scattering

3

• Degree of medium thermalization – production and elliptic 4ow sensitive to dynamics of the medium

• Parton energy loss mechanism

• Cross-sections calculable within pQCD

• Unique probes of QGP properties

★Heavy Quarks c, b★produced in ini5al hard processes★produc5on well described by pQCD ★excellent probe of the strongly interac5ng Quark-‐Gluon Plasma

STAR%Detector%System%%TPC#MTD#Magnet# BEMC# BBC#EEMC# TOF#

HFT#

6/19/14% RHC(AGS%users%meeDng% 7%David Tlusty RHIC/AGS Annual Users’ Mee5ng 2015

The STAR Detector

3

EEMC TOFTPCBEMCMTDMagnet


HFT#


The STAR Detector

« VPD: minimum bias trigger

3



HFT#


The STAR Detector


« TPC: par4cle iden4fica4on, momentum

3



HFT#


The STAR Detector



« TOF: par4cle iden4fica4on (4me resolu4on 110 ps in p+p, 87 ps in Au+Au)

3



HFT#


The STAR Detector



« TOF: par4cle iden4fica4on (4me resolu4on 110 ps in p+p, 87 ps in Au+Au)

« BEMC: high-‐energy trigger, electron iden4fica4on

3


0 1 2 3 4 5

1

2

p [GeV/c ]

ln(dE/dx

)ln

keVcm

!1 TPC PID

0.5 1 1.5 2 2.5 31

2

3

4

1/!

p [GeV/c ]

protons

kaonspions

1/! =ctL

t from TOFL from TPC

1/!m2

p2+ 1

criterium of PID

Energy 200 GeV 500 GeV 500 GeVTrigger VPDMB VPDMB BHT1# events 105M 51M 111M�pp 30± 3.5 mb 34± 4 mb 6± 1 µb


Daughter Par5cle Iden5fica5on

4

TOF provides clean sample of kaons with momentum up to ∼1.6 GeV/c

kaon -‐ pion separa5on be\er by TPC than by TOF for track with momentum above ∼2.5 GeV/c

0 1 2 3 4 5

1

2

p [GeV/c ]

ln(dE/dx

)ln

keVcm

!1 TPC PID

0.5 1 1.5 2 2.5 31

2

3

4

1/!

p [GeV/c ]

protons

kaonspions

1/! =ctL

t from TOFL from TPC

1/!m2

p2+ 1

criterium of PID

Energy 200 GeV 500 GeV 500 GeVTrigger VPDMB VPDMB BHT1# events 105M 51M 111M�pp 30± 3.5 mb 34± 4 mb 6± 1 µb


Daughter Par5cle Iden5fica5on

4

TOF provides clean sample of kaons with momentum up to ∼1.6 GeV/c

kaon -‐ pion separa5on be\er by TPC than by TOF for track with momentum above ∼2.5 GeV/c

ln(dE/dx) [ln(keV/cm)]0.6 0.8 1 1.2 1.4 1.6 1.8

1

10

210

310 protonskaonspionselectrons

4.5 < p < 5 GeV/c

]2 [GeV/c/KM1.75 1.8 1.85 1.9 1.95 2 2.05

)2R

aw Y

ield

(/10

MeV

/c

-1-0.5

00.5

11.5

22.5

33.5

310=

1016(RwYld = 4584 /ndf = 27.426/332r

0.003( = 1.865 +

0.0025( = 0.0112 m

]2 [GeV/c/KM0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4

0

5

10

)2R

aw Y

ield

(/10

MeV

/c

15

20

410=

0 1 2 3 4 5 6 7 8 9 10 11Unlike-Sign (left scale)

Like-Sign (left scale)Rotated Momentum (left scale)Unlike – Like (right scale)Unlike – Rotated (right scale)

]2 [GeV/c/KM1.75 1.8 1.85 1.9 1.95 2 2.05

)2R

aw Y

ield

(/10

MeV

/c

-1-0.5

0

0.51

1.5

22.5

33.5

310=

996(RwYld = 3564 /ndf = 17.643/332r

0.003( = 1.866 +

0.0029( = 0.0110 m

410=

1 < pT(K/) < 2 GeV/c-1 < y(K/) < 1

K0*(892)

K2*(1430) D0(1865)

VPDMBp+p @ 500 GeV


D0 Meson Reconstruc5on

5

D0

K−

π+


D* Meson Reconstruc5on

6

wrong-sign method was included in the systematic uncer-tainties. Details in determining the uncertainties on the rawD! yields including the double-counting effect will bediscussed in Sec. VA. The D! raw yields are summarizedin Table II.

To obtain the cross section, the event-selection criteriadescribed in the previous section were applied. The rawdistributions were further divided into pT slices to obtainthe raw D! yields in each pT bin. Figure 8 shows the D!

candidates and background distributions in different pT

bins. The bottom panel on each plot was generated bysubtracting the sideband background from the right-signcandidates. The mean and width from Gaussian fits arecompared with MC simulation in the right panel of Fig. 6,

and it shows the obtained D! peak positions and widthsagree with the MC simulation well. From this analysis, thetotal signal consisted of 364" 68 counts, and the raw yieldratio of D!#=D!$ is 0:93" 0:37.

IV. EFFICIENCYAND TRIGGER OR VERTEXBIAS CORRECTION

The final charmed-hadron cross section in p$ p colli-sions is calculated as follows:

Ed3!

dp3 % 1

2"& 1

#rec& 1

BR& !ND

pT!pT!y& !NSD

NMB& ftrg;vtx; (3)

where !NSD is the total nonsingly diffractive (NSD) crosssection, which is measured at STAR to be 30:0" 2:4 mb[30].NMB is the total number of minimum-bias events usedfor the analysis. !ND is the raw charmed-hadron signal ineach pT bin within a rapidity window !y. BR is thehadronic decay branching ratio for the channel of interest.There are two correction factors: #rec, which is the recon-struction efficiency including geometric acceptance, trackselection efficiency, PID efficiency, and analysis cut effi-ciency; and ftrg;vtx'pT(, which is the correction factor to

)2) (GeV/c!)-M(KM(K!!0.14 0.145 0.15 0.155 0.16 0.165

Cou

nts

0

500

1000

1500

2000

2500

right sign

wrong sign

sideband

)2) (GeV/c!M(K1.7 1.75 1.8 1.85 1.9 1.95 2 2.05

Cou

nts

0

200

400

600

800

1000

1200

1400

1600

1800

2000

candidates0 D

sideband

FIG. 7 (color online). Upper: Raw D! candidate signal fromthe right-sign combinations in all p$ p minimum-biasevents. Histograms are combinatorial background distributionsfrom wrong-sign and sideband methods. Lower: Raw D0

candidates after requiring the D! candidate cut (0:144<!M<0:147 GeV=c2).

TABLE II. D! raw yields.

pT range (GeV=c) 2–3 3–4 4–5 5–6

pT (GeV=c) 2.45 3.44 4.45 5.45Raw yields 209" 58 98" 35 27" 11 12:3" 4:1

Cou

nts

100

200

300

400

500

600 <3GeV/cT

2<p

right sign (RS) wrong sign (WS) sideband (SB)

)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

50

100RS-SB

Cou

nts

20

40

60

80

100 <4GeV/cT

3<p


)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

20

40 RS-SB

Cou

nts

5

10

15

20

25

30<5GeV/c

T4<p right sign (RS)

wrong sign (WS) sideband (SB)

)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

-5

0

5

10

15 RS-SB

Cou

nts

2

4

6

8

10

12 <6GeV/cT

5<p right sign (RS) wrong sign (WS) sideband (SB)

)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

5

RS-SB

FIG. 8 (color online). Raw D! signals in different pT bins.In each plot, the bottom panel distribution is generated bysubtracting the sideband background from the right-sign distri-bution. Variable binning is used in the bottom panel for betterillustration.

L. ADAMCZYK et al. PHYSICAL REVIEW D 86, 072013 (2012)

072013-8

Phys. Rev. D 86, 72013a)

b)



6








Ed3!

dp3 % 1

2"& 1

#rec& 1

BR& !ND

pT!pT!y& !NSD

NMB& ftrg;vtx; (3)


)2) (GeV/c!)-M(KM(K!!0.14 0.145 0.15 0.155 0.16 0.165

Cou

nts

0

500

1000

1500

2000

2500

right sign

wrong sign

sideband

)2) (GeV/c!M(K1.7 1.75 1.8 1.85 1.9 1.95 2 2.05

Cou

nts

0

200

400

600

800

1000

1200

1400

1600

1800

2000

candidates0 D

sideband




pT range (GeV=c) 2–3 3–4 4–5 5–6


Cou

nts

100

200

300

400

500

600 <3GeV/cT

2<p


)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

50

100RS-SB

Cou

nts

20

40

60

80

100 <4GeV/cT

3<p


)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

20

40 RS-SB

Cou

nts

5

10

15

20

25

30<5GeV/c



)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

-5

0

5

10

15 RS-SB

Cou

nts

2

4

6

8

10

12 <6GeV/cT


)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

5

RS-SB



072013-8

Phys. Rev. D 86, 72013a)

b)

D0

K−π+



6








Ed3!

dp3 % 1

2"& 1

#rec& 1

BR& !ND

pT!pT!y& !NSD

NMB& ftrg;vtx; (3)


)2) (GeV/c!)-M(KM(K!!0.14 0.145 0.15 0.155 0.16 0.165

Cou

nts

0

500

1000

1500

2000

2500

right sign

wrong sign

sideband

)2) (GeV/c!M(K1.7 1.75 1.8 1.85 1.9 1.95 2 2.05

Cou

nts

0

200

400

600

800

1000

1200

1400

1600

1800

2000

candidates0 D

sideband




pT range (GeV=c) 2–3 3–4 4–5 5–6


Cou

nts

100

200

300

400

500

600 <3GeV/cT

2<p


)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

50

100RS-SB

Cou

nts

20

40

60

80

100 <4GeV/cT

3<p


)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

20

40 RS-SB

Cou

nts

5

10

15

20

25

30<5GeV/c



)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

-5

0

5

10

15 RS-SB

Cou

nts

2

4

6

8

10

12 <6GeV/cT


)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

5

RS-SB



072013-8

Phys. Rev. D 86, 72013a)

b)

D0

K−π+

π+

D*+

M( ) M( )



6








Ed3!

dp3 % 1

2"& 1

#rec& 1

BR& !ND

pT!pT!y& !NSD

NMB& ftrg;vtx; (3)


)2) (GeV/c!)-M(KM(K!!0.14 0.145 0.15 0.155 0.16 0.165

Cou

nts

0

500

1000

1500

2000

2500

right sign

wrong sign

sideband

)2) (GeV/c!M(K1.7 1.75 1.8 1.85 1.9 1.95 2 2.05

Cou

nts

0

200

400

600

800

1000

1200

1400

1600

1800

2000

candidates0 D

sideband




pT range (GeV=c) 2–3 3–4 4–5 5–6


Cou

nts

100

200

300

400

500

600 <3GeV/cT

2<p


)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

50

100RS-SB

Cou

nts

20

40

60

80

100 <4GeV/cT

3<p


)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

20

40 RS-SB

Cou

nts

5

10

15

20

25

30<5GeV/c



)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

-5

0

5

10

15 RS-SB

Cou

nts

2

4

6

8

10

12 <6GeV/cT


)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

5

RS-SB



072013-8

Phys. Rev. D 86, 72013a)

b)

D0

K−π+

π+

D*+

M( ) M( )



6








Ed3!

dp3 % 1

2"& 1

#rec& 1

BR& !ND

pT!pT!y& !NSD

NMB& ftrg;vtx; (3)


)2) (GeV/c!)-M(KM(K!!0.14 0.145 0.15 0.155 0.16 0.165

Cou

nts

0

500

1000

1500

2000

2500

right sign

wrong sign

sideband

)2) (GeV/c!M(K1.7 1.75 1.8 1.85 1.9 1.95 2 2.05

Cou

nts

0

200

400

600

800

1000

1200

1400

1600

1800

2000

candidates0 D

sideband




pT range (GeV=c) 2–3 3–4 4–5 5–6


Cou

nts

100

200

300

400

500

600 <3GeV/cT

2<p


)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

50

100RS-SB

Cou

nts

20

40

60

80

100 <4GeV/cT

3<p


)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

20

40 RS-SB

Cou

nts

5

10

15

20

25

30<5GeV/c



)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

-5

0

5

10

15 RS-SB

Cou

nts

2

4

6

8

10

12 <6GeV/cT


)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

5

RS-SB



072013-8

Phys. Rev. D 86, 72013a)

b)

D0

K−π+

π+

D*+

M( ) M( )



6








Ed3!

dp3 % 1

2"& 1

#rec& 1

BR& !ND

pT!pT!y& !NSD

NMB& ftrg;vtx; (3)


)2) (GeV/c!)-M(KM(K!!0.14 0.145 0.15 0.155 0.16 0.165

Cou

nts

0

500

1000

1500

2000

2500

right sign

wrong sign

sideband

)2) (GeV/c!M(K1.7 1.75 1.8 1.85 1.9 1.95 2 2.05

Cou

nts

0

200

400

600

800

1000

1200

1400

1600

1800

2000

candidates0 D

sideband




pT range (GeV=c) 2–3 3–4 4–5 5–6


Cou

nts

100

200

300

400

500

600 <3GeV/cT

2<p


)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

50

100RS-SB

Cou

nts

20

40

60

80

100 <4GeV/cT

3<p


)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

20

40 RS-SB

Cou

nts

5

10

15

20

25

30<5GeV/c



)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

-5

0

5

10

15 RS-SB

Cou

nts

2

4

6

8

10

12 <6GeV/cT


)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

5

RS-SB



072013-8

Phys. Rev. D 86, 72013a)

b)

D0

K−π+

π+

D*+

π−

M( ) M( )



6








Ed3!

dp3 % 1

2"& 1

#rec& 1

BR& !ND

pT!pT!y& !NSD

NMB& ftrg;vtx; (3)


)2) (GeV/c!)-M(KM(K!!0.14 0.145 0.15 0.155 0.16 0.165

Cou

nts

0

500

1000

1500

2000

2500

right sign

wrong sign

sideband

)2) (GeV/c!M(K1.7 1.75 1.8 1.85 1.9 1.95 2 2.05

Cou

nts

0

200

400

600

800

1000

1200

1400

1600

1800

2000

candidates0 D

sideband




pT range (GeV=c) 2–3 3–4 4–5 5–6


Cou

nts

100

200

300

400

500

600 <3GeV/cT

2<p


)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

50

100RS-SB

Cou

nts

20

40

60

80

100 <4GeV/cT

3<p


)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

20

40 RS-SB

Cou

nts

5

10

15

20

25

30<5GeV/c



)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

-5

0

5

10

15 RS-SB

Cou

nts

2

4

6

8

10

12 <6GeV/cT


)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

5

RS-SB



072013-8

Phys. Rev. D 86, 72013a)

b)

D0

K−π+

π+

D*+

M( ) M( )



6








Ed3!

dp3 % 1

2"& 1

#rec& 1

BR& !ND

pT!pT!y& !NSD

NMB& ftrg;vtx; (3)


)2) (GeV/c!)-M(KM(K!!0.14 0.145 0.15 0.155 0.16 0.165

Cou

nts

0

500

1000

1500

2000

2500

right sign

wrong sign

sideband

)2) (GeV/c!M(K1.7 1.75 1.8 1.85 1.9 1.95 2 2.05

Cou

nts

0

200

400

600

800

1000

1200

1400

1600

1800

2000

candidates0 D

sideband




pT range (GeV=c) 2–3 3–4 4–5 5–6


Cou

nts

100

200

300

400

500

600 <3GeV/cT

2<p


)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

50

100RS-SB

Cou

nts

20

40

60

80

100 <4GeV/cT

3<p


)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

20

40 RS-SB

Cou

nts

5

10

15

20

25

30<5GeV/c



)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

-5

0

5

10

15 RS-SB

Cou

nts

2

4

6

8

10

12 <6GeV/cT


)2) (GeV/c!) - M(K M(K!!0.14 0.145 0.15 0.155

)2C

ount

s (/

0.2

MeV

/c

0

5

RS-SB



072013-8

Phys. Rev. D 86, 72013a)

b)

D0

K−π+

π+

D*+

)2) (GeV/c/)-M(K//M(K0.14 0.145 0.15 0.155 0.16 0.165

Cou

nts

100

200

300

400

500

600

right signwrong signside band

STAR preliminary

= 500 GeVsp+p > 4.2 GeVTE

[GeV/c]T

p0 2 4 6 8 10 12 14 16 18 20

]-2

dy) [

mb(

GeV

/c)

Tdp Tp/

/(2

/< / p

pm2 d

-910

-810

-710

-610

-510

-410

-310

-210

-110

1

10 Trigger Efficiency=BHT1 pions

Nucl. Phys. B 335 261-287 500 GeVpUA1 pions from p

scaled from pp 200 to pp 500 GeV by PythiaSTAR pions, Phys. Rev. Lett. 108 72302

< 13.5 GeV/cT

in 12 < pPythia Pions scaled to match STAR pions

with lower and upper boundHagedorn Power-law fit to STAR pions

STAR Pions, measured from Min Bias sample

[GeV/c]T

p

0 2 4 6 8 10 12 14 16 18 20

Eff

icie

ncy

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

[GeV/c]T

p

4 6 8 10 12 14 16 18 20

Effic

iency

-610

-510

-410

-310

-210

-110

Matching0

D

Reconstruction0

D

Matching MB*D

Reconstruction MB*D

Reconstruction HT*D

Trigger HT*D

p+p @ 500 GeV


Correc5ons

7

pT [GeV/c] 1-‐2 2-‐3 3-‐8

VPDMB bias 0.70 0.65 0.63

Pion Spectra in VPDMB and BHT1 D0 & D* efficiencies

[GeV/c]Tp0 2 4 6 8 10 12 14 16 18 20

]-2

dy) [

mb(

GeV

/c)

Tdp Tp/

)/(2

ccppm2

(d

-810

-710

-610

-510

-410

-310

-210

-110 / 0.224 BHT1D*md

/ 0.224 MBD*md

/ 0.565 MB0Dmd

Levy-fit to All

0FONLL D

FONLL D*

fact. + BCFY FFTk

fact. + Peterson FFTk

[GeV/c]Tp0 2 4 6 8 10 12 14 16 18 20

]-2

dy) [

mb(

GeV

/c)

Tdp Tp/

)/(2

cppm2

(d

-810

-710

-610

-510

-410

-310

-210

-110

kT fact. : ѥF = ѥR = (mc)T, mc = 1.5 GeV/c2

FONLL D0: ѥF = ѥR = mc = 1.27 GeV/c2

FONLL D*: ѥF = ѥR = (mc)T, 1.3 < mc < 1.7 GeV/c2

[JHEP 9805 007]

[Phys. Rev. C87 014908]

[Phys. Rev. D 87 094022]

[Phys. Rev. D 87 094022]

p+p @ 500 GeV

[GeV/c]T

p0 2 4 6 8 10 12 14 16 18 20

]-2

dy) [

mb(

GeV

/c)

Tdp Tp/

)/(2

ccppm2

(d

-810

-710

-610

-510

-410

-310

-210

[GeV/c]T

p0 2 4 6 8 10 12 14 16 18 20

]-2

dy) [

mb(

GeV

/c)

Tdp Tp/

)/(2

cppm2

(d

-810

-710

-610

-510

-410

-310

-210 ccmd

Levy-fit

cFONLL c

limits cFONLL c

[JHEP 9805 007]

quadratic sum of mass and scale uncertainty

p+p @ 500 GeV

ccmd = dmD ×FONLL ccFONLL D


Charm Cross Sec5on at Mid-‐rapidity

8

[GeV]s210 310 410

b]+ [

ccNNm

1

10

210

310

410

NLONLO limitSPS/FNALPHENIX ePamir/MuonUA2

STAR p+pSTAR Au+AuALICE[2]

ATLAS PreliminaryLHCb Preliminary

[1] Vogt R. et al., PoS ConfinementX (2012) 203ALICE Collaboration, JHEP07(2012)191

�+ F/m, + R

/m) = (1.35, 1.71)�+ F/m, + R

/m) = (4.65, 1.48)

NLO: m = 1.27 GeV/c2

+F/m = 2.1+R/m = 1.6

d�cc̄

dy⇥

((5.6± 0.1) @ 500 GeV(4.7± 0.7) @ 200 GeV


Total Charm Cross Sec5on

9

Extrapola5on to full rapidity from Pythia simula5on:

[3] Phys. Rev. D86, 72013

[3]

[GeV]s210 310 410

b]+ [

ccNNm

1

10

210

310

410

NLONLO limitSPS/FNALPHENIX ePamir/MuonUA2

STAR p+pSTAR Au+AuALICE[2]

ATLAS PreliminaryLHCb Preliminary

[1] Vogt R. et al., PoS ConfinementX (2012) 203ALICE Collaboration, JHEP07(2012)191

�+ F/m, + R

/m) = (1.35, 1.71)�+ F/m, + R

/m) = (4.65, 1.48)

NLO: m = 1.27 GeV/c2

+F/m = 2.1+R/m = 1.6

d�cc̄

dy⇥

((5.6± 0.1) @ 500 GeV(4.7± 0.7) @ 200 GeV


Total Charm Cross Sec5on

9

Many thanks to:

Jaro BielcikXin DongWitek BorowskiJamie DunlopZhangbu XuPavol Federic

Extrapola5on to full rapidity from Pythia simula5on:

[3] Phys. Rev. D86, 72013

[3]


Special Thanks To

10

Prof. Zdeněk Janout Msgr. Georges Lemaître

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