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Abramowicz, H.; Abt, I.; Adamczyk, L.; Aggarwal, R.; Antonioli, P.; Arneodo, M.; Bamberger, A.; Bartosik, N.; Basile, M.; Behnke, O.; Behr, J.; Behrens, U.; Bellagamba, L.; Bot, D.; Brzozowska, B.; Catterall, C.D.; Ciesielski, R.; Cindolo, F.; Cooper-Sarkar, A.M.; Coppola, N.; del Peso, J.; Dementiev, R.K.; Eisenberg, Y.; Eskreys, A.; Fazio, S.; Ferrero, M.I.; Garfagnini, A.; Geiser, A.; Gogota, O.; Grigorescu, G.; Gueta, O.; Guzik, M.; Gwenlan, C.; Hain, W.; Hamatsu, R.; Hart, J.C.; Hartmann, H.; Hori, R.; Horton, K.; Hüttmann, A.; Iga, Y.; Ingbir, R.; Kaur, P.; Khein, L.A.; Kim, J.Y.; Kitamura, S.; Kooijman, P.; Korol, Ie; Kowalski, H.; Ling, T.Y.; Löhr, B.; Longhin, A.; Lukina, O.Yu; Makarenko, I.; Malka, J.; Mastroberardino, A.; Miglioranzi, S.; Mohamad Idris, F.; Monaco, V.; Montanari, A.; Nagano, K.; Nania, R.; Nobe, T.; Notz, D.; Nowak, R.J.; Okazaki, N.; Papageorgiu, K.; Pawlak, J.M.; Perrey, H.; Pluciński, P.; Pokrovskiy, N.S.; Reeder, D.D.; Ren, Z.; Robertson, A.; Rubinsky, I.; Ruspa, M.; Schioppa, M.; Shehzadi, R.; Singh, I.; Słomiński, W.; Solano, A.; Son, D.; Stanco, L.; Stefaniuk, N.; Stern, A.; Stopa, P.; Theedt, T.; Trusov, V.; Turcato, M.; Tymieniecka, T.; Vlasov, N.N.; Walczak, R.; Wan Abdullah, W.A.T.; Wrona, K.; Yamada, S.; Yamazaki, Y.; Zabiegalov, O.; Zhautykov, B.O.; Zichichi, A.; Zotkin, D.S.
Nuclear physics. B, 11/2012, Letnik: 864, Številka: 1Journal Article
Inclusive-jet cross sections have been measured in the reaction ep→e+jet+X for photon virtuality Q2<1 GeV2 and γp centre-of-mass energies in the region 142<Wγp<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, ηjet, for jets with ETjet>17 GeV and −1<ηjet<2.5. In addition, measurements of double-differential inclusive-jet cross sections are presented as functions of ETjet in different regions of ηjet. Next-to-leading-order QCD calculations give a good description of the measurements, except for jets with low ETjet and high ηjet. The influence of non-perturbative effects not related to hadronisation was studied. Measurements of the ratios of cross sections using different jet algorithms are also presented; the measured ratios are well described by calculations including up to O(αs2) terms. Values of αs(MZ) were extracted from the measurements and the energy-scale dependence of the coupling was determined. The value of αs(MZ) extracted from the measurements based on the kT jet algorithm is αs(MZ)=0.1206−0.0022+0.0023(exp.)−0.0035+0.0042(th.); the results from the anti-kT and SIScone algorithms are compatible with this value and have a similar precision.
