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SUMMARY:Charged Particle Distributions in Deep Inelastic Scattering and Ph
 otoproduction
DTSTART;VALUE=DATE-TIME:20100723T070000Z
DTEND;VALUE=DATE-TIME:20100723T071300Z
DTSTAMP;VALUE=DATE-TIME:20130619T102943Z
UID:indico-contribution-1171@cern.ch
DESCRIPTION:Speakers: TRAYNOR\, Daniel (Queen Mary\, Univ. of London)\nTra
 nsverse Momentum of Charged Particles at low Q^2 at HERA\nThe electron-pro
 ton collider HERA allows deep-inelastic scattering (DIS) at very small Bjo
 rken-x of about 10^-5. At such small x new parton dynamics beyond DGLAP ar
 e expected to become important. Charged particle spectra are measured in D
 IS (Q^2 > 5 GeV^2)\, in different regions of pseudorapidity\, using the in
 creased statistics of HERA-2. The measurements are compared to simulations
  based on different Monte Carlo generators. It is shown that the region of
  small transverse momenta is primarily sensitive to hadronisation\, wherea
 s the region of large transverse momenta is mainly driven by perturbative 
 parton radiation. The observed hardness of the transverse momentum spectra
 \, when compared to different model predictions\, can be interpreted as su
 pporting the idea of parton dynamics beyond DGLAP.\n\nScaled momentum dist
 ributions of charged particles in dijet photoproduction at HERA\nThe scale
 d momentum distributions of charged particles in jets have been  measured 
 for dijet photoproduction with the ZEUS detector at HERA using an  integra
 ted luminosity of 359 pb-1. The distributions are compared to  predictions
  based on perturbative QCD carried out in the framework of the  modified l
 eading-logarithmic approximation (MLLA) and assuming local  parton-hadron 
 duality (LPHD). The universal MLLA scale\, Lambda_eff\, and the LPHD param
 eter\, kappa^ch\, are extracted.\n\nScaled Momentum Spectra in deep inelas
 tic Scattering at HERA\nCharged particle production has been studied in ne
 utral current deep  inelastic ep scattering with the ZEUS detector at HERA
  using an integrated  luminosity of 0.44 fb-1. Distributions of scaled mom
 enta in the Breit  frame are presented for particles in the current fragme
 ntation region. The  evolution of these spectra with the photon virtuality
 \, Q2\, is described in  the kinematic region 10 \n\nhttp://indico.cern.ch
 /contributionDisplay.py?contribId=1171&sessionId=46&confId=73513
LOCATION: Salle 253
URL:http://indico.cern.ch/contributionDisplay.py?contribId=1171&sessionId=
 46&confId=73513
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