ZEUS

Dec

. 200

1 Nikhef Jamboree

ZEUS experiment 2001

• Installation of Microvertex Detector

• Hera upgrade for higher collision rates

• Data analyses

ZEUS

Dec

. 200

1 Nikhef Jamboree

• Proposal, design and construction took 4 years• February 2001 final transport from NIKHEF to

DESY– Feb/March full system test– March 27th installation in ZEUS– July short cosmic run– December first collision(s)

Silicon Microvertex Detector

ZEUS

Dec

. 200

1 Nikhef Jamboree

electrons protons

60 cm

32 cm

Layout Microvertex Detector

Cross section wheel Cross section barrel

Support cylinderdivided in 2 halves

=

=

ZEUS

Dec

. 200

1 Nikhef Jamboree

Barrel Sensors

Detector side Hybrid side

2 half modules Ladder

ZEUS

Dec

. 200

1 Nikhef Jamboree

MVD assembly

300 barrel half modules 112 wheel modules 30 ladders 8 half wheels

ZEUS

Dec

. 200

1 Nikhef Jamboree

MVD assembly (2 halves)

ZEUS

Dec

. 200

1 Nikhef Jamboree

MVD assembly (two halves)

ZEUS

Dec

. 200

1 Nikhef Jamboree

Full System test

• 200 k readout channels have to function together• test final setup for the cabling• setting/monitoring low voltage front end readout• setting/monitoring bias voltage sensors• test complete readout chain analog datalink/ADC,

triggers for pedestals and testpulses• cooling • slow control monitoring• measure cosmics

• Full system operational, No bad surprises• about 1% of channels give problems

ZEUS

Dec

. 200

1 Nikhef Jamboree

• Cosmic Ray setup at DESY

Scintillatortowers

Scintillatorplates forforward wheels

Scintillatorat the side

x-y plane z-y plane

Full System Test

ZEUS

Dec

. 200

1 Nikhef Jamboree

• First Results Reconstruction Cosmic Rays

– Event display single track event

E.Maddox

Full System test

ZEUS

Dec

. 200

1 Nikhef Jamboree

• First Results Reconstruction Cosmic Rays• Distribution of residuals track fit obtained

with default geometry, more survey data to be included.

Residual (mm)Residual (mm)

R Phi hits Z hits

Full System Test

ZEUS

Dec

. 200

1 Nikhef Jamboree

• Response ‘inclined’ Tracks

clustersum

angle beta angle

angle alpha0 1.5 rad

1.5 rad0

clustersum

clustersum

Full System Test

ZEUS

Dec

. 200

1 Nikhef Jamboree

Detailed Monte Carlo simulations exist for MVD

GEANT

Status of the new tracking software

MC tracks

Impact parameter resolution at vertex for fitted single tracks

E.Maddox

With MVD included!

Up to NOW,CTD only

xy

xy

z

z

0.4mm

0.07mm

2.2mm

0.08mm

ZEUS

Dec

. 200

1 Nikhef Jamboree

Manifold water cooling(two mounted on top of eachother, input/output)

Polyurethane tubes

Stainless steel tube

MVD assembly (cooling)

ZEUS

Dec

. 200

1 Nikhef Jamboree

• Monitoring Cooling system as function of Time (hor.scale hist. 12 hours)

Switch on low voltage

Water temp. (14C) Water press (1.6bar) Humidity in MVD

Temp. wheel ~23C

Temp. ladder ~18C Temp. ladder ~18CTemp. ladder ~18C

Temp. in MVD ~18C Temp. in MVD ~18CMonitor 1 Monitor 2

Cooling Performance

ZEUS

Dec

. 200

1 Nikhef Jamboree

Inserted in front (proton side) Cables at the rear

MVD in ZEUS

March 27th 2001 in ZEUS Hall

ZEUS

Dec

. 200

1 Nikhef Jamboree

4 years of design and construction work beautifully documented onweb page and put on CD by Marco Kraan

1 year assemblyand installation workcompiled on a 25’video byEls Koffeman

Documentation

ZEUS

Dec

. 200

1 Nikhef Jamboree

Install quadrupoles near interaction pointinstall spinrotators, long.polarized e-beams

Luminosityx 5

1000 pb-1

end 2005

HERA +ZEUS upgrade

ZEUS

Dec

. 200

1 Nikhef Jamboree

HELIX chips (AMS 0.8 CMOS) •tested up to 500Krad

• worse performances (S/N)• partly recoverable changing operation point

Radiation damage FE electronics

J.Velthuis

Single sensor

m

ZEUS

Dec

. 200

1 Nikhef Jamboree

• irradiation from IP negligible•off momentum e- and e-

(<20 GeV)•Synchrotron radiation,

backscattered fromcollimators (<100 keV )complex pattern

•Proton beam loss (accidents)

Monitor radiation backgroundwith pin diodes near the beampipe inside the MVD.

34 mm

28 mm

diodes

Monitor Background Radiation

ZEUS

Dec

. 200

1 Nikhef Jamboree

Proton structure -evolution equations -parton densitiesGluon radiation - first and higher orderHadronization - many MonteCarlo generators

‘hard scale’ : high Q2, high ET jets, high mass…...

What do we observe?

-Diffractive events-Deep inelastic scattering-multi jet events-heavy quark production….

DGLAP,BFKL,CCFM,MRS,GRV,CTEQnn,..

HVQDIS,DISENT,JETNLO,DISASTER,..

HERWIG,RAPGAP,EPSOFT,PHOJET,LEPTO,ARIADNE,CASCADE,PYTHIA,DJANGO,HERACLES….

Physics at HERA test and understanding QCD

ZEUS

Dec

. 200

1 Nikhef Jamboree

322

22

4

2

2

2

))1(1())1(1(2

xFyFyFyxQdxdQ

dL

x fractional four-momentum of struck quarky inelasticity

Q2 four-momentum transfer squared e

N. Tuning(PhD thesis Sept.2001)

e

Proton structure function

ZEUS

Dec

. 200

1 Nikhef Jamboree

N. Tuning

Highest x-bins

Proton structure function F2

ZEUS

Dec

. 200

1 Nikhef Jamboree

HERA II: -improve high x,Q2 data - e-running, balance samples - progress theory (NNLO), better fits

Proton structure function xF3

322

22

4

2

2

2

))1(1())1(1(2

xFyFyFyxQdxdQ

dL

ZEUS

Dec

. 200

1 Nikhef Jamboree

Any sign of charm production

πDD* S.Schagen.. ec

K

eOpen Charm Production in DIS

c2F

)M(Kπ)M(K-) M(K s

ZEUS

Dec

. 200

1 Nikhef Jamboree

DD *.. ec

Kinematical quantities

S.Schagen

Open Charm Production in DIS

ZEUS

Dec

. 200

1 Nikhef Jamboree

Contribution of charm to proton structure function F2

S.Schagen

Open Charm Production in DIS

ZEUS

Dec

. 200

1 Nikhef Jamboree

Available data very still very scarce

Reconstruct jets and look for electrons or muonsin jet as function of

HERA II: + MicroVertex gives proper b- data + MicroVertex gives more c-decay channels, smaller Background, smaller kin extrapolations--> better measurement

Beauty Production in Photoproduction

relt

p

ZEUS

Dec

. 200

1 Nikhef Jamboree

data? e versusein productionD differenceAny - *

More Open Charm Production in DIS

ZEUS

Dec

. 200

1 Nikhef Jamboree

More Open Charm Production in DISNo special triggers requiredAll DIS events accepted

0KM

M 2KM3KM 00

-M

-M KK

-M KK

ZEUS

Dec

. 200

1 Nikhef Jamboree

•Use the large number of D* collected in ZEUS (~31K)

•Select D+s1 D*+K0

S (K-++

S)(+-) + c.c.•From the well measured f(c D*+) we get the fragment. fraction f(c D+

s1)

.)%(14.0.)(.)(18.024.1)( 08.006.01 brsyststatDcf s

HERA: a Charm factory

Just an example

ZEUS

Dec

. 200

1 Nikhef Jamboree

• D* production in diffractive DIS• Charm in Photoproduction vs NLO• Charm dijet photoproduction vs LO

and NLO• Huge D* sample in photoproduction

– charm fragmentation universal?– spectroscopy of D mesons– probe rare decays– ..

D*)f(c

Many new results

BUT HERA II + MicroVertex will do better + improved triggers

HERA: a Charm factory

ZEUS

Dec

. 200

1 Nikhef Jamboree

ZEUS

Dec

. 200

1 Nikhef Jamboree

ZEUS

Dec

. 200

1 Nikhef Jamboree

ZEUS

Dec

. 200

1 Nikhef Jamboree

ZEUS

Dec

. 200

1 Nikhef Jamboree

ZEUS

Dec

. 200

1 Nikhef Jamboree

322

22

4

2

2

2

))1(1())1(1(2

xFyFyFyxQdxdQ

dL

x fractional four-momentum of struck quark

Q2 four-momentum transfer squared

y inelasticity

W photon-proton centre of mass energy

22 kkQ

qp

Qx

2

2

kp

qpy

2kpW

Proton structure function

ZEUS

Dec

. 200

1 Nikhef Jamboree

MVD assembly (two halves)

• Install Beampipe on lower MVD half• Carbonfiber tube surrounds Beampipe

– protection silicon– electrical shielding beam

• Turn upper MVD half upside down • Mount both halves together with help precision pins on

support frames• Connect both halves electrically and create Faraday cage

for the front end readout• keep supportframes attached until installation in ZEUS

ZEUS

Dec

. 200

1 Nikhef Jamboree

Rear end MVD

Super conducting magnetburied in MVD cables

HERA +ZEUS upgrade