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Title: Measurements of Proton Structure at HERA

Abstract

Measurements of proton structure in deep inelastic scattering in ep interactions are presented. The data were recorded with the H1 and ZEUS detectors at the HERA ep collider in both phases, HERAI (1994-2000) and HERAII (2003-2005). The data were used to extract quark and gluon parton distribution functions (PDFs) and to determine the strong coupling {alpha}s.

Authors:
 [1]
  1. Departamento de Fisica, Cinvestav, AP 14-740, 0700 Mexico DF (Mexico)
Publication Date:
OSTI Identifier:
20787691
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 809; Journal Issue: 1; Conference: EAV05: Advanced summer school in physics 2005: Frontiers in contemporary physics, Mexico City (Mexico), 11-22 Jul 2005; Other Information: DOI: 10.1063/1.2160985; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DEEP INELASTIC SCATTERING; DISTRIBUTION FUNCTIONS; ELECTRON-PROTON INTERACTIONS; GLUONS; HERA STORAGE RING; MULTIPARTICLE SPECTROMETERS; PARTICLE IDENTIFICATION; PROTONS; QUARKS; STRONG-COUPLING MODEL

Citation Formats

Lopez-Fernandez, R. Measurements of Proton Structure at HERA. United States: N. p., 2006. Web. doi:10.1063/1.2160985.
Lopez-Fernandez, R. Measurements of Proton Structure at HERA. United States. doi:10.1063/1.2160985.
Lopez-Fernandez, R. Fri . "Measurements of Proton Structure at HERA". United States. doi:10.1063/1.2160985.
@article{osti_20787691,
title = {Measurements of Proton Structure at HERA},
author = {Lopez-Fernandez, R.},
abstractNote = {Measurements of proton structure in deep inelastic scattering in ep interactions are presented. The data were recorded with the H1 and ZEUS detectors at the HERA ep collider in both phases, HERAI (1994-2000) and HERAII (2003-2005). The data were used to extract quark and gluon parton distribution functions (PDFs) and to determine the strong coupling {alpha}s.},
doi = {10.1063/1.2160985},
journal = {AIP Conference Proceedings},
number = 1,
volume = 809,
place = {United States},
year = {Fri Jan 06 00:00:00 EST 2006},
month = {Fri Jan 06 00:00:00 EST 2006}
}
  • Predictions for longitudinal spin asymmetries which single out new polarized nucleon structure functions in deeply inelastic charged current interactions at DESY HERA energies are given, exploiting their interpretation in terms of polarized quark distributions. These asymmetries turn out to be large and allow a measurement of the new polarized structure functions g{sub 1}{sup W} and g{sub 5}{sup W}, which would add valuable tests and information on the spin content of quarks inside a polarized proton. We also show that single-spin asymmetries in neutral current interactions are very small. {copyright} {ital 1997} {ital The American Physical Society}
  • Inclusive ep scattering measurements at low virtualities of the exchanged boson, Q2, allow precision tests of perturbative QCD at high gluon densities, as well as studies of the transition from the perturbative to non-perturbative QCD domain. Measurements in the transition region require special experimental approaches due to the limited detector acceptance. The current status and results of low Q2 measurements at HERA are summarised.
  • The ZEUS detector has been used to measure the proton structure function F{sub 2} in collisions of 26.7 GeV electrons and positrons with 820 GeV protons at the HERA collider. The data selection, acceptance corrections and systematic uncertainties are described. Results are shown for Q{sup 2} values up to 10{sup {minus}4}. The measurements confirm the observation of the rapid rise in F{sub 2} as x decreases and are used to extract information about the gluon distribution in the proton. New data taken with a shifted positron-proton interaction point allow a measurement of f{sub 2} at Q{sup 2} values as lowmore » as 2 GeV{sup 2}, permitting a comparison with previous results from fixed target experiments.« less
  • The proton structure function F2 is measured using inelastic QED Compton events. The data were collected by H1 experiment at the HERA in 1997 and correspond to a luminosity of 9.25 pb-1. QED Compton events allow to access very low Q2 region, down to 0.5 GeV2 and Bjorken x up to {approx} 0.06, a region that has not been covered by previous inclusive measurements at HERA. The results are in agreement with measurements from fixed targed lepton-nucleon scattering experiments.
  • We propose a phenomenological study of the next-to-leading Balitsky-Fadin-Kuraev-Lipatov (BFKL) approach applied to the data on the proton structure function F2 measured at HERA in the small-xBj region.