Jet-radius dependence of inclusive-jet cross sections in deep inelastic scattering at HERA

S Chekanov,M Rosin,U Holm,M Kuze,H Hartmann,B Brzozowska,A Dossanov,S Menary,M Kataoka,C Targett-Adams,S Magill,J Szuba,I Abt,F Dal Corso,S Bhadra,M Derrick,J Whyte,A Everett,A Cottrell,E Hilger,G Marini,J Rautenberg,J Sztuk,A Longhin,K Wick,E Lohrmann,P Łużniak,G Sartorelli,D Hochman,C Horn,S Dusini,B Kahle,R Hamatsu,S De Pasquale,D Szuba,U Samson,R Yoshida,J Ciborowski,T Matsumoto,F Karstens,V Schönberg,U Schneekloth,Y.D Ri,R Walczak,R Brugnera,A Raval,T Gosau,V Monaco,S Kananov,P Ryan,I Rubinsky,M Jechow,J Malka,E Brownson,L Zawiejski,H Kowalski,Y Eisenberg,M Adamus,M Przybycień,A Bruni,L Wiggers,M Turcato,A Eskreys,W Słomiński,U Noor,D Boscherini,O Ota,S Limentani,G Grigorescu,V Roberfroid,A Bertolin,A Garfagnini,A Ukleja,T Danielson,R Ingbir,K Wichmann,I Giller,J Ukleja,T Tsurugai,D Kçira,U Karshon,P Kulinski,U Kötz,J Del Peso,P Stopa,G Bari,D.S Zotkin,J Fourletova,C Uribe-Estrada,R Hori,P Göttlicher,K Olkiewicz,B.O Zhautykov,L Labarga,M Zambrana,P Bellan,B Löhr,B Musgrave,M.C.K Mattingly,M Wlasenko,T Namsoo,R Santamarta,L Bellagamba,K Wrona,A Polini,B.Y Oh,D Gladkov,A Keramidas,B Kamaluddin,S Fourletov,A Nigro,L Suszycki,H Wolfe,J Standage,A.G Yagües Molina,N Brümmer,S Fazio,J Łukasik,B Foster,A.S Proskuryakov,R.C.E Devenish,S Antonelli,G Grzelak,D Notz,T Tymieniecka,A Kotański,M Jüngst,W Hain,K Korcsak-Gorzo,V Adler,J De Favereau,A Bamberger,S Schlenstedt,M Basile,A Galas,I Gialas,E Ron,D.D Reeder,N Pavel,S Goers,Y Iga,N Okazaki,T Theedt,A Stifutkin,C Youngman,J Sutiak,D Nicholass,R Shehzadi,R Renner,M R Sutton ,V A Kuzmin ,S A Zotkin ,J E Cole ,M Jiménez ,Wan Ahmad Tajuddin Wan Abdullah ,P Pluciński ,P.B Straub,H Tiecke,A Pellegrino,A F Żarnecki ,А Спиридонов ,C D Catterall ,H Abramowicz,Z Ren,S Miglioranzi,M Capua,H Stadie,K.J Ma,A I Robertson ,M Schioppa,C Glasman,G Susinno,B A Dolgoshein ,William M Dunne ,J J Whitmore ,P Kooijman,A Geiser,J M Pawlak ,P Bussey ,Shruti Patel ,G Bruni,B B Levchenko ,Meng Wang ,A M Cooper-Sarkar ,K Piotrzkowski,A N Barakbaev ,Hiroshi Kaji ,I.-A Melzer-Pellmann,N Coppola,E Gallo,K Tokushuku,P Schleper,I Katkov ,T Y Ling ,M Gil,E Tassi,A Contin,A Montanari,D C Son ,I M Gregor ,F Cindolo,L Adamczyk,P Ermolov ,S Suchkov,L Stančo ,M S Soares ,R Sacchi,K Long ,A Caldwell,T Bołd,M Corradi,F Barreiro,J Repond,K Nagano,S Shimizu,T Haas,R Ciesielski,I Bloch,L.M Shcheglova,P D Allfrey ,G Wolf,M A Bell ,A Bonato,A M Gabareen ,F Sciulli,E Koffeman,L A Khein ,H Salehi,D Bartsch,L Cifarelli,G Iacobucci,C Büttner,G Hartner,C A Fry ,E Lobodzinska,P Antonioli,I Grabowska-Bołd,S Kagawa,O Yu Lukina ,W B Schmidke ,G P Heath ,B Bylsma,А Антонов ,Yanou Cui ,Ning Ye ,R Carlin,K Borras,D Kisielewska,O M Kind ,J M Butterworth ,M Bindi,D Kollár ,R J Nowak ,W H Smith ,F Corriveau,A Lee,R K Dementiev ,A Margotti,J Figiel,A Levy,A Zichichi,Wolfram Dietrich Zeuner ,N H Brook ,R Nania,E.G Boos,T Schörner-Sadenius,N Vlasov ,D H Saxon ,A Mastroberardino,T Tawara,M Ruspa,T W Jones ,J D Morris ,V Sosnovtsev,J J Chwastowski ,C Gwenlan,I Brock,J C Hart ,L Rinaldi,Chuanlei Liu ,W Lohmann,S Boutle ,R Klanner,M I Ferrero ,Zainol Abidin Ibrahim ,J.Y Kim,A.A Savin,N S Pokrovskiy ,Y Yamazaki,A E Nuncio-Quiroz ,A Solano,E Paul,H.‐P Jakob ,U Behrens,S Kitamura,S Yamada,P G Pelfer ,L K Gladilin ,L S Durkin ,G Barbagli,C Foudas,A T Doyle ,J H Loizides ,R Walsh,J F Martin ,I A Korzhavina ,D Dobur,M Wing,M Arneodo,I O Skillicorn ,R Mankel,G D’agostini ,C Zhou,A Tapper ,M Vázquez,J Ferrando,J Terrón,U Stößlein

doi:10.1016/j.physletb.2007.03.039

Abstract

Differential inclusive-jet cross sections have been measured for different jet radii in neutral current deep inelastic ep scattering for boson virtualities Q^2 > 125 GeV^2 with the ZEUS detector at HERA using an integrated luminosity of 81.7 pb^-1. Jets were identified in the Breit frame using the k_T cluster algorithm in the longitudinally inclusive mode for different values of the jet radius R. Differential cross sections are presented as functions of Q^2 and the jet transverse energy, E_T,B^jet. The dependence on R of the inclusive-jet cross section has been measured for Q^2 > 125 and 500 GeV^2 and found to be linear with R in the range studied. Next-to-leading-order QCD calculations give a good description of the measurements for 0.5 <= R <= 1. A value of alpha_s(M_Z) has been extracted from the measurements of the inclusive-jet cross-section dsigma/dQ^2 with R=1 for Q^2 > 500 GeV^2: alpha_s(M_Z) = 0.1207 +- 0.0014 (stat.) -0.0033 +0.0035 (exp.) -0.0023 +0.0022 (th.). The variation of alpha_s with E_T,B^jet is in good agreement with the running of alpha_s as predicted by QCD.

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