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Structure functions at low x and Q 2 at ZEUS. 8th International Workshop on Deep Inelastic Scattering and QCD Liverpool, April 2000. Jonathan Scott ZEUS Collaboration. University of Bristol. Introduction. HERA provides a unique opportunity to explore

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Structure functions at low x and Q 2 at ZEUS

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Structure functions at low x and q 2 at zeus

Structure functions at

low x and Q2 at ZEUS

8th International Workshop on

Deep Inelastic Scattering and QCD

Liverpool, April 2000

Jonathan Scott

ZEUS Collaboration

University of Bristol


Structure functions at low x and q 2 at zeus

Introduction

HERA provides a unique opportunity to explore

the transition region between perturbative and

non perturbative QCD.

The kinematic region at low Q2 and x can be

reached using small angle detectors and

Initial State radiative events.

  • This presentation

  • Kinematics

  • BPC/BPT Detectors

  • Results

  • Possibilities from ISR

  • Summary


Structure functions at low x and q 2 at zeus

Kinematics 1

27.5GeV positrons

820GeV protons

Negative 4-momentum squared of virtual photon

Bjorken scaling

Fractional energy loss of electron in proton rest frame

Mass2 of Hadronic system


Structure functions at low x and q 2 at zeus

Kinematics 2

Differential cross section for * + p  X is

FL Longitudinal structure function

- relevant at high y

xF3 - Parity violating Term

Low x approximation


Structure functions at low x and q 2 at zeus

Kinematic Region

Lowest Q2 bin  0.045GeV2

Highest y bin 0.84

Lowest y bin  0.005


Structure functions at low x and q 2 at zeus

BPC/BPT


Structure functions at low x and q 2 at zeus

BPC/BPT Bins

High yE´e > 4.4GeVElectron Method

Medium yE´e > 7GeVElectron Method

Low y(+prescale)E´e > 20GeVSigma Method


Structure functions at low x and q 2 at zeus

BPC/BPT event selection


Structure functions at low x and q 2 at zeus

Control Plots


Structure functions at low x and q 2 at zeus

Control Plots


Structure functions at low x and q 2 at zeus

Results


Structure functions at low x and q 2 at zeus

Results


Structure functions at low x and q 2 at zeus

Results


Structure functions at low x and q 2 at zeus

ISR


Structure functions at low x and q 2 at zeus

FL


Structure functions at low x and q 2 at zeus

ISR Kinematic range

Bridges Q2 range between BPC/BPT

and nominal F2 analyses as well

as overlap in y with Fixed Target experiments


Structure functions at low x and q 2 at zeus

Summary


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