Speakers
Mr
Philipp Roloff
(Deutsches Elektronen-Synchrotron (DESY))
Philipp Roloff
(DESY)Dr
Philipp Roloff
(CERN)
Description
Differential inclusive-jet cross sections have been measured
in photoproduction for boson virtualities Q2 < 1 GeV2 with the ZEUS
detector at HERA using an integrated luminosity of 300 pb-1.
Jets were identified in the laboratory using the kt cluster algorithm
in the longitudinally inclusive mode.
Cross sections are presented as functions of the jet pseudorapidity, etajet,
and the jet transverse energy, Etjet. In addition, measurements of
double-differential inclusive-jet cross sections are presented as
functions of Etjet in different regions of etajet.
These cross sections have the potential to constrain the gluon density
in the proton and the photon when included as input to fits
to extract the proton parton distribution functions.
Next-to-leading-order QCD calculations give a good description
of the measurements.
A value of alphas(Mz) has been extracted from the measurements.
The energy-scale dependence of the coupling has also been determined.
Primary author
Aharon Levy
(Tel Aviv University (IL))
