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Czech participation in the H1 experiment. J. Žáček, Institute of Particle and Nuclear P hysics, Charles University in Prague. Institute of Physics of the Academy of Sciencies of the Czech Republic

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slide1

Czech participation in the H1 experiment

J. Žáček,

Institute of Particle and Nuclear Physics,

Charles University in Prague

  • Institute of Physics of the Academy of Sciencies of the
  • Czech Republic
  • Institute of Particle and Nuclear Physics, Faculty of Mathematics and
  • Physics, Charles University in Prague
  • Participation since 1987: subdetector construction
  • design and production of electronics
  • program development
  • data analysis

H1 Prague group : 5 senior physicists, 4 PhD students

Financial support : Ministry of Education, Youth and Sports

running costs , visits at DESY and conferences

h1 experiment

H1 experiment

Prague contribution:

Calorimeter SPACAL

(1994-1995)

p

Liquid argon

Calorimeter

(1987-1990)

Backward

silicon tracker

(1996-1997)

e

Forward silicon tracker

(2001-2005)

prague contribution to the forward silicon tracker fst
Prague contribution to the Forward silicon tracker (FST)
  • Testing of silicon sensors (laser tests etc. .. }
  • Development and production of electronics
  • Development of the slow control and DAQ
  • Simulation of FST
  • Analysis of data taken in 2004 ( D* production)

FST was constructed mainly by DESY-Zeuthen and Prague

The first FST data were taken in 2004

J. Žáček

slide4

Forward and backward silicon detectors

p

BST

electronics cards

(repeaters)

e

FST

wheels of strip

Si sensors

electronics cards

J. Žáček

slide5

converters

Si sensor wheels

repeaters

J. Žáček

Converters + repeaters were designed and produced in Prague

slide8

Track reconstruction in FST

Reconstructed event

FST wheels

FST track residuals

longitudinal view

J. Žáček

transverse view

slide9

Very Forward proton spectrometer (VFPS)

Installed in 2003.

Detection of diffracted protons scattered in the beam pipe

H1

e

VFPS, 220 m

p

IP

Beam pipe

t < 0.25 GeV2

VFPS2

J. Žáček

VFPS1

3.7 m

slide10
VFPS

Czech participation: Reconstruction of tracks in VFPS

(in collaboration with Belgian H1 group)

A method based on the neural network was developed

Goal: From hits in the VFPS to get proton track parameters in the interaction

vertex. This is a complicated procedure since there are accelerator

magnets which have influence on proton tracks.

data analysis
Data analysis

Measurement of dijet production at low Q2 at HERA

e + p

e + X

Pp q

Q2 = - (k – k’ )2 , y =

Pp k

Q2

jet

g

Direct photon

interactions

e

e

LO

undetected jet

p

p

NLO

e

Resolved photon

interactions

LO

p

NLO

LO

slide12

Measurement of dijet production at low Q2 at HERA

DATA 99/00, 2 < Q2 < 80 GeV2

GOAL : Detailed comparison of triple differential cross

sections

(e.g. d3s / dQ2dy dh* , h* jet rapidity in g-p CMS)

with generators and NLO QCD calculations

Generators : HERWIG,LO MC, DGLAP evolution, dir + res photons

+ parton showering+ cluster hadronisation

CASCADE,LO MC,unintegrated PDF+ CCFM evolution

scheme + LUND string hadronisation

NLO calculations: JETVIP

J. Žáček

slide13

Measurement of dijet production at low Q2 at HERA

0.1 < y < 0.25 0.25 < y < 0.5 0.5 < y < 0.85

● H1 data

(pb)

Generators

HERWIG dir

HERWIG dir+resT

HERWIG dir+resT

+resL

CASCADE

QCD calculations

NLO JTEVIP

dir

NLO JTEVIP

total

h*

-2 -1 0 -2 -1 0 -2 -1

  • NLO QCD calculations underestimate data at high y
  • HERWIG – better agreement if the longitudinal photon is included
slide14

Dijets in difractive photoproduction

DATA 99/00 , Q2 < 0.1 GeV2 ( photoproduction) , t < 1 GeV2

  • Test of QCD factorisation in dijet diffractive photoproduction
  • Comparison of data with NLO calculations

J. Žáček

slide15

Dijets in difractive photoproduction

Motivation: Dijet diffractive cross section determined at TEVATRON

is lower by a factor ~ 5 than the QCD calculation using

HERA diffractive PDFs.

Exporting HERA PDFs tothe Tevatron doesn’t

work ?, factorisation breaking?

Analogy of pp interactions and ep resolved photon interactions

H1 data analysis is performed by our PhD student

J. Žáček

further activities and outlook
Further activities and outlook

Further activities:

  • Calibration of the VFPS with r mesons , data 2005/2007
  • Calibration of final state hadronic energies
  • Development of the software package HZTOOL, which enables fast
  • comparison of theoretical calculations with published experimental
  • results

Outlook: ~ next 4 years analysis of H1 data from 05-07

(~ 3 PhD thesis)

- measurement of the longitudinal diffractive

proton structure function

- forward jets in diffraction

J. Žáček

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