20-27 July 2011
Alpes Congrès - Alpexpo
Europe/Paris timezone

Jet Production at HERA with ZEUS

21 Jul 2011, 09:00
15m
Bayard (Alpes Congrès - Alpexpo)

Bayard

Alpes Congrès - Alpexpo

Parallel session talk QCD

Speaker

Joerg Behr

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. 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. A value of alphas(Mz) has been extracted from the measurements. For the first time, differential inclusive-jet cross sections have been measured in neutral current deep inelastic ep scattering using the anti-kt and SIScone algorithms, as well as the nominal kt cluster algorithm. The measurements were made for boson virtualities Q2 > 125 GeV2 and the jets were identified in the Breit frame. Measurements of the ratios of cross sections using different jet algorithms are also presented and values of alphas(Mz) are extracted from the data. Single- and double-differential inclusive dijet cross sections in neutral current deep inelastic ep scattering have been measured using an integrated luminosity of 374 pb-1. The measurement was performed at large values of the photon virtuality, Q2, between 125 and 20000 GeV2. Single- and double-differential dijet cross sections have also been measured in photoproduction for boson virtualities Q2 < 1 GeV2 with the ZEUS detector at HERA using an integrated luminosity of 300 pb-1. 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.

Primary author

Dr Aharon LEVY (Tel Aviv University)

Presentation Materials