Jul 20 – 27, 2011
Alpes Congrès - Alpexpo
Europe/Paris timezone

Jet Production at HERA and determination of alpha_s with H1

Jul 21, 2011, 9:15 AM
Bayard (Alpes Congrès - Alpexpo)


Alpes Congrès - Alpexpo

Parallel session talk QCD


Artem Baghdasaryan


Inclusive-jet, dijet and trijet differential cross sections have been measured in neutral current deep-inelastic ep scattering for exchanged boson virtualities 150 < Q2 < 15000 GeV2 with the H1 detector at HERA. The measurements are used to determine value of the strong coupling alpha_s(M_Z). Additionally, the production of jets is studied at low four momentum transfer squared $5 < Q2 < 100 GeV2$ using integrated luminosity of 300 $pb^{-1}$. Cross sections are measured as a function of Q2 and jet transverse momentum and compared to the perturbative next-to-leading order QCD calculations corrected for hadronisation effects. Finally, the production of jets is studied in deep-inelastic e+p scattering at low negative four momentum transfer squared 5 < Q2 < 100 GeV2 and at inelasticity 0.2 < y < 0.7 using data recorded by the H1 detector at HERA in the years 1999 and 2000, corresponding to an integrated luminosity of 43.5 pb-1. Inclusive jet, 2-jet and 3-jet cross sections as well as the ratio of 3-jet to 2-jet cross sections are measured as a function of Q2 and jet transverse momentum. The 2-jet cross section is also measured as a function of the proton momentum fraction xi. The measurements are well described by perturbative quantum chromodynamics at next-to-leading order corrected for hadronisation effects and are subsequently used to extract the strong coupling alpha_s.

Primary author

Dr Katja KRUEGER (KIP, Heidelberg University, H1 Collaboration)

Presentation materials