Inclusive-jet photoproduction at HERA and determination of alphas

Understand

Inclusive-jet cross sections have been measured in the reaction ep->e+jet+X for photon virtuality Q2 < 1 GeV2 and gamma-p centre-of-mass energies in the region 142 < W(gamma-p) < 293 GeV with the ZEUS detector at HERA using an integrated luminosity of 300 pb-1.

• Jets were identified using the kT, anti-kT or SIScone jet algorithms in the laboratory frame.
• Single-differential cross sections are presented as functions of the jet transverse energy, ETjet, and pseudorapidity, etajet, for jets with ETjet > 17 GeV and -1 < etajet < 2.5.
• In addition, measurements of double-differential inclusive-jet cross sections are presented as functions of ETjet in different regions of etajet.