Inclusive-jet photoproduction at HERA and determination of α s

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. BasileO. Behnke, J. Behr, U. Behrens, L. Bellagamba, A. Bertolin, S. Bhadra, M. Bindi, C. Blohm, V. Bokhonov, T. Bołd, K. Bondarenko, E. G. Boos, K. Borras, D. Boscherini, D. Bot, I. Brock, E. Brownson, R. Brugnera, N. Brümmer, 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. Göttlicher, I. Grabowska-Bołd, J. Grebenyuk, I. Gregor, G. Grigorescu, G. Grzelak, O. Gueta, M. Guzik, C. Gwenlan, T. Haas, W. Hain, R. Hamatsu, J. C. Hart, H. Hartmann, G. Hartner, E. Hilger, D. Hochman, R. Hori, K. Horton, A. Hüttmann, Z. A. Ibrahim, Y. Iga, R. Ingbir, M. Ishitsuka, H. P. Jakob, F. Januschek, T. W. Jones, M. Jüngst, I. Kadenko, B. Kahle, S. Kananov, T. Kanno, U. Karshon, F. Karstens, I. I. Katkov, M. Kaur, P. Kaur, A. Keramidas, L. A. Khein, J. Y. Kim, D. Kisielewska, S. Kitamura, R. Klanner, U. Klein, E. Koffeman, N. Kondrashova, O. Kononeko, P. Kooijman, Ie Korol, I. A. Korzhavina, A. Kotański, U. Kötz, H. Kowalski, O. Kuprash, M. Kuze, A. Lee, B. B. Levchenko, A. Levy, V. Libov, S. Limentani, T. Y. Ling, M. Lisovyi, E. Lobodzinska, W. Lohmann, B. Löhr, E. Lohrmann, K. R. Long, A. Longhin, D. Lontkovskyi, O. Yu Lukina, J. Maeda, S. Magill, I. Makarenko, J. Malka, R. Mankel, A. Margotti, G. Marini, J. F. Martin, A. Mastroberardino, M. C.K. Mattingly, I. A. Melzer-Pellmann, S. Mergelmeyer, S. Miglioranzi, F. Mohamad Idris, V. Monaco, A. Montanari, J. D. Morris, K. Mujkic, B. Musgrave, K. Nagano, T. Namsoo, R. Nania, A. Nigro, Y. Ning, T. Nobe, U. Noor, D. Notz, R. J. Nowak, A. E. Nuncio-Quiroz, B. Y. Oh, N. Okazaki, K. Oliver, K. Olkiewicz, Yu Onishchuk, K. Papageorgiu, A. Parenti, E. Paul, J. M. Pawlak, B. Pawlik, P. G. Pelfer, A. Pellegrino, W. Perlański, H. Perrey, K. Piotrzkowski, P. Pluciński, N. S. Pokrovskiy, A. Polini, A. S. Proskuryakov, M. Przybycień, A. Raval, D. D. Reeder, B. Reisert, Z. Ren, J. Repond, Y. D. Ri, A. Robertson, P. Roloff, I. Rubinsky, M. Ruspa, R. Sacchi, U. Samson, G. Sartorelli, A. A. Savin, D. H. Saxon, M. Schioppa, S. Schlenstedt, P. Schleper, W. B. Schmidke, U. Schneekloth, V. Schönberg, T. Schörner-Sadenius, J. Schwartz, F. Sciulli, L. M. Shcheglova, R. Shehzadi, S. Shimizu, I. Singh, I. O. Skillicorn, W. Słomiński, W. H. Smith, V. Sola, A. Solano, D. Son, V. Sosnovtsev, A. Spiridonov, H. Stadie, L. Stanco, N. Stefaniuk, A. Stern, T. P. Stewart, A. Stifutkin, P. Stopa, S. Suchkov, G. Susinno, L. Suszycki, J. Sztuk-Dambietz, D. Szuba, J. Szuba, A. D. Tapper, E. Tassi, J. Terrón, T. Theedt, H. Tiecke, K. Tokushuku, J. Tomaszewska, V. Trusov, T. Tsurugai, M. Turcato, O. Turkot, T. Tymieniecka, M. Vázquez, A. Verbytskyi, O. Viazlo, N. N. Vlasov, R. Walczak, W. A.T. Wan Abdullah, J. J. Whitmore, L. Wiggers, M. Wing, M. Wlasenko, G. Wolf, H. Wolfe, K. Wrona, A. G. Yagües-Molina, S. Yamada, Y. Yamazaki, R. Yoshida, C. Youngman, O. Zabiegalov, A. F. Zarnecki, L. Zawiejski, O. Zenaiev, W. Zeuner, B. O. Zhautykov, N. Zhmak, C. Zhou, A. Zichichi, Z. Zolkapli, D. S. Zotkin

Research output: Contribution to journalArticlepeer-review

Abstract

Inclusive-jet cross sections have been measured in the reaction ep→e+jet+X for photon virtuality Q 2<1 GeV 2 and γp centre-of-mass energies in the region 142<W γp<293 GeV with the ZEUS detector at HERA using an integrated luminosity of 300 pb -1. Jets were identified using the k T, anti-k T or SIScone jet algorithms in the laboratory frame. Single-differential cross sections are presented as functions of the jet transverse energy, ETjet, and pseudorapidity, jet, for jets with ETjet>17 GeV and -1< jet<2.5. In addition, measurements of double-differential inclusive-jet cross sections are presented as functions of ETjet in different regions of jet. Next-to-leading-order QCD calculations give a good description of the measurements, except for jets with low ETjet and high jet. 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 α s(M Z) were extracted from the measurements and the energy-scale dependence of the coupling was determined. The value of α s(M Z) extracted from the measurements based on the k T jet algorithm is αs(MZ)=0.1206-0.0022+0.0023(exp.)-0.0035+0.0042(th.); the results from the anti-k T and SIScone algorithms are compatible with this value and have a similar precision.

Original languageEnglish
Pages (from-to)1-37
Number of pages37
JournalNuclear Physics B
Volume864
Issue number1
DOIs
StatePublished - 1 Nov 2012

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