Measurement Of Neutral Current E(+/-)P Cross Sections At High Bjorken X With The Zeus Detector

H Abramowicz,I Abt,L Adamczyk,M Adamus, R L Aggarwal,S Antonelli,Ozan Arslan,V Aushev,Y Aushev,O Bachynska,A N Barakbaev,Nazar Bartosik,O Behnke, J Behr, U Behrens,A Bertolin,S Bhadra,I Bloch,V Bokhonov,E Boos,K Borras, I Brock,R Brugnera,A Bruni,B Brzozowska,P Bussey,A Caldwell,M Capua,C D Catterall,J Chwastowski,J Ciborowski,R Ciesielski,A M Coopersarkar,M Corradi,F Corriveau,G D Agostini, R K Dementiev, R C E Devenish,Ganna Dolinska,V Drugakov,S Dusini,J Ferrando,J Figiel,B Foster,G Gach,A Garfagnini, A Geiser,Andrii Gizhko,L K Gladilin,O Gogota,Yu A Golubkov,J Grebenyuk,I M Gregor,G Grzelak,Orel Gueta,M Guzik,W Hain,G F Hartner,D Hochman,R Hori,Z A Ibrahim,Y Iga,Masaki Ishitsuka, A Iudin,F Januschek,I Kadenko,S Kananov,T Kanno,U Karshon,M Kaur,P Kaur, L A Khein, D Kisielewska,R Klanner,U Klein,Nataliia Kondrashova,O Kononenko,Ie Korol, I A Korzhavina,A Kotanski,U Koetz, N Kovalchuk,H Kowalski,O Kuprash,M Kuze,B B Levchenko,A Levy,V Libov,S Limentani,M Lisovyi,E Lobodzinska,W Lohmann,B Loehr,E Lohrmann,A Longhin,D Lontkovskyi,O Yu Lukina,J Maeda,I Makarenko

PHYSICAL REVIEW D（2014）

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摘要

The neutral current e(+/-)p cross section has been measured up to values of Bjorken x congruent to 1 with the ZEUS detector at HERA using an integrated luminosity of 187 pb(-1) of e(-p) and 142 pb(-1) of e(+)p collisions at root s = 318 GeV. Differential cross sections in x and Q(2), the exchanged boson virtuality, are presented for Q2 >= 725 GeV2. An improved reconstruction method and greatly increased amount of data allows a finer binning in the high-x region of the neutral current cross section and leads to a measurement with much improved precision compared to a similar earlier analysis. The measurements are compared to Standard Model expectations based on a variety of recent parton distribution functions.

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