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29 March 2024
 
  » arxiv » 1205.6153

 Article overview


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 ; 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. Huttmann ; Z. A. Ibrahim ; Y. Iga ; R. Ingbir ; M. Ishitsuka ; H. -P. Jakob ; F. Januschek ; T. W. Jones ; M. Jungst ; 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. Kotanski ; U. Kotz ; 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. Lohr ; 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. Perlanski ; H. Perrey ; K. Piotrzkowski ; P. Plucinski ; N. S. Pokrovskiy ; A. Polini ; A. S. Proskuryakov ; M. Przybycien ; 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. Schonberg ; T. Schorner-Sadenius ; J. Schwartz ; F. Sciulli ; L. M. Shcheglova ; R. Shehzadi ; S. Shimizu ; I. Singh ; I. O. Skillicorn ; W. Slominski ; 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. Terron ; T. Theedt ; H. Tiecke ; K. Tokushuku ; J. Tomaszewska ; V. Trusov ; T. Tsurugai ; M. Turcato ; O. Turkot ; T. Tymieniecka ; M. Vazquez ; 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. Yagues-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 ;
Date 28 May 2012
AbstractInclusive-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.
Source arXiv, 1205.6153
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