Triple di.erential dijet cross sections in e±p interactions are presented in the region of photonvirtualities 2 < Q2 < 80 GeV2, inelasticities 0.1 < y < 0.85, jet transverse energies E. 1 > 7 GeV,E. 2 > 5 GeV, and pseudorapidities -2.5 < ç.1, ç.2 < 0. The measurements are made in the ã.p centre-ofmassframe, using an integrated luminosity of 57 pb-1. The data are compared with NLO QCD calculationsand LO Monte Carlo programs with and without a resolved virtual photon contribution. NLO QCDcalculations fail to describe the region of low Q2 and low jet transverse energies, in contrast to a LOMonte Carlo generator which includes direct and resolved photon interactions with both transversely andlongitudinally polarised photons. Initial and .nal state parton showers are tested as a mechanism forincluding higher order QCD e.ects in low ET jet production.
Aktas, A., Andreev, V., Anthonis, T., Asmone, A., Stella, B.R. (2004). Measurement of Dijet Production at Low Q^2 at HERA, C37, 141-159.
Measurement of Dijet Production at Low Q^2 at HERA
STELLA, Bruno Raffaele
2004-01-01
Abstract
Triple di.erential dijet cross sections in e±p interactions are presented in the region of photonvirtualities 2 < Q2 < 80 GeV2, inelasticities 0.1 < y < 0.85, jet transverse energies E. 1 > 7 GeV,E. 2 > 5 GeV, and pseudorapidities -2.5 < ç.1, ç.2 < 0. The measurements are made in the ã.p centre-ofmassframe, using an integrated luminosity of 57 pb-1. The data are compared with NLO QCD calculationsand LO Monte Carlo programs with and without a resolved virtual photon contribution. NLO QCDcalculations fail to describe the region of low Q2 and low jet transverse energies, in contrast to a LOMonte Carlo generator which includes direct and resolved photon interactions with both transversely andlongitudinally polarised photons. Initial and .nal state parton showers are tested as a mechanism forincluding higher order QCD e.ects in low ET jet production.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
