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arXiv · 1205.6153

Inclusive-jet photoproduction at HERA and determination of alphas

ZEUS Collaboration·H. Abramowicz·I. Abt·L. Adamczyk·M. Adamus·R. Aggarwal·S. Antonelli·P. Antonioli·A. Antonov·M. Arneodo·V. Aushev·Y. Aushev·O. Bachynska·A. Bamberger·A. N. Barakbaev·G. Barbagli·G. Bari·F. Barreiro·N. Bartosik·D. Bartsch·M. Basile·O. Behnke·J. Behr·U. Behrens·L. Bellagamba·A. Bertolin·S. Bhadra·M. Bindi·C. Blohm·V. Bokhonov·T. Bold·K. Bondarenko·E. G. Boos·K. Borras·D. Boscherini·D. Bot·I. Brock·E. Brownson·R. Brugnera·N. Brummer·A. Bruni·G. Bruni·B. Brzozowska·P. J. Bussey·B. Bylsma·A. Caldwell·M. Capua·R. Carlin·C. D. Catterall·S. Chekanov·J. Chwastowski·J. Ciborowski·R. Ciesielski·L. Cifarelli·F. Cindolo·A. Contin·A. M. Cooper-Sarkar·N. Coppola·M. Corradi·F. Corriveau·M. Costa·G. D'Agostini·F. Dal Corso·J. del Peso·R. K. Dementiev·S. De Pasquale·M. Derrick·R. C. E. Devenish·D. Dobur·B. A. Dolgoshein·G. Dolinska·A. T. Doyle·V. Drugakov·L. S. Durkin·S. Dusini·Y. Eisenberg·P. F. Ermolov·A. Eskreys·S. Fang·S. Fazio·J. Ferrando·M. I. Ferrero·J. Figiel·M. Forrest·B. Foster·G. Gach·A. Galas·E. Gallo·A. Garfagnini·A. Geiser·I. Gialas·A. Gizhko·L. K. Gladilin·D. Gladkov·C. Glasman·O. Gogota·Yu. A. Golubkov·P. Gottlicher·I. Grabowska-Bold·J. Grebenyuk
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Abstract

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. Next-to-leading-order QCD calculations give a good description of the measurements, except for jets with low ETjet and high etajet. 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(alphas2) terms. Values of alphas(Mz) were extracted from the measurements and the energy-scale dependence of the coupling was determined. The value of alphas(Mz) extracted from the measurements based on the kT jet algorithm is alphas(Mz) = 0.1206 +0.0023 -0.0022 (exp.) +0.0042 -0.0035 (th.); the results from the anti-kT and SIScone algorithms are compatible with this value and have a similar precision.

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ZEUS Collaboration, H. Abramowicz, I. Abt, L. Adamczyk, M. Adamus, R. Aggarwal, S. Antonelli, P. Antonioli, A. Antonov, M. Arneodo, V. Aushev, Y. Aushev, O. Bachynska, A. Bamberger, A. N. Barakbaev, G. Barbagli, G. Bari, F. Barreiro, N. Bartosik, D. Bartsch, M. Basile, O. Behnke, J. Behr, U. Behrens, L. Bellagamba, A. Bertolin, S. Bhadra, M. Bindi, C. Blohm, V. Bokhonov, T. Bold, K. Bondarenko, E. G. Boos, K. Borras, D. Boscherini, D. Bot, I. Brock, E. Brownson, R. Brugnera, N. Brummer, A. Bruni, G. Bruni, B. Brzozowska, P. J. Bussey, B. Bylsma, A. Caldwell, M. Capua, R. Carlin, C. D. Catterall, S. Chekanov, J. Chwastowski, J. Ciborowski, R. Ciesielski, L. Cifarelli, F. Cindolo, A. Contin, A. M. Cooper-Sarkar, N. Coppola, M. Corradi, F. Corriveau, M. Costa, G. D'Agostini, F. Dal Corso, J. del Peso, R. K. Dementiev, S. De Pasquale, M. Derrick, R. C. E. Devenish, D. Dobur, B. A. Dolgoshein, G. Dolinska, A. T. Doyle, V. Drugakov, L. S. Durkin, S. Dusini, Y. Eisenberg, P. F. Ermolov, A. Eskreys, S. Fang, S. Fazio, J. Ferrando, M. I. Ferrero, J. Figiel, M. Forrest, B. Foster, G. Gach, A. Galas, E. Gallo, A. Garfagnini, A. Geiser, I. Gialas, A. Gizhko, L. K. Gladilin, D. Gladkov, C. Glasman, O. Gogota, Yu. A. Golubkov, P. Gottlicher, I. Grabowska-Bold, J. Grebenyuk. 2012-05-28. Inclusive-jet photoproduction at HERA and determination of alphas. https://doi.org/10.1016/j.nuclphysb.2012.06.006

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