Production of Z0 bosons in elastic and quasi-elastic ep collisions at HERA

H Abramowicz,I Abt,L Adamczyk,M Adamus,Rohit Aggarwal,S Antonelli,P Antonioli,A S Antonov,M Arneodo,Ozan Arslan,V Aushev,Y Aushev,O Bachynska,A Bamberger,A N Barakbaev, G Barbagli,G Bari,F Barreiro,Nazar 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 Boos,K Borras, D Boscherini,D Bot, I Brock, E Brownson,R Brugnera,N Brummer,A Bruni, G Bruni,B Brzozowska, P 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 Coopersarkar,N Coppola,M Corradi,F Corriveau,Marco Costa,G Dagostini,F Dal Corso,J Del Peso, R K Dementiev,S De Pasquale,M Derrick, R C E Devenish, D Dobur, B A Dolgoshein,Ganna Dolinska,A T Doyle,V Drugakov, L S Durkin,S Dusini,Y Eisenberg,P Ermolov,A Eskreys,S Fang,S Fazio,James Ferrando,M I Ferrero,J Figiel,B Foster,G Gach,A Galas, E Gallo,A Garfagnini, A Geiser,I Gialas,Andrii Gizhko,L K Gladilin,D Gladkov,C Glasman,O Gogota,Yu A Golubkov,P Gottlicher,I Grabowskabold,J Grebenyuk,I M Gregor,G Grigorescu,G Grzelak,Orel Gueta,M Guzik,C Gwenlan,T Haas, W Hain,R Hamatsu, J C Hart,H Hartmann,G F Hartner,E Hilger,D Hochman,R Hori,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 Katkov, M Kaur,P Kaur,A Keramidas,L A Khein,J Y Kim, D Kisielewska,S Kitamura,R Klanner,U Klein, E Koffeman,N N Kondrashova,O Kononenko,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 Melzerpellmann,Sebastian Mergelmeyer,S Miglioranzi,F Mohamad Idris, Vincenzo Monaco,A Montanari, J D Morris,K Mujkic,B Musgrave,Kunihiro Nagano,T Namsoo, R Nania,A Nigro,Y Ning,T Nobe,D Notz,R J Nowak,A E Nuncioquiroz,B Y Oh,Naoaki Okazaki,K Olkiewicz,Yu Onishchuk,K Papageorgiu,A Parenti,E Paul,J M Pawlak,B Pawlik,P G Pelfer,A Pellegrino,W Perlanski,Hanno Perrey,Krzysztof Piotrzkowski,Pawel Plucinski,N S Pokrovskiy, A Polini,A S Proskuryakov,M Przybycien,Amita 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 Savin,D H Saxon, M Schioppa,S Schlenstedt, P Schleper,W B Schmidke,U Schneekloth,V Schonberg,T Schornersadenius,J Schwartz,F Sciulli,L M Shcheglova,R Shehzadi, S Shimizu, I P Singh,I O Skillicorn,W Slominski,W H Smith,Valentina Sola,Ada 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 Sztukdambietz,D Szuba,J Szuba,Alexander 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, Oleksandr Viazlo,N N Vlasov, R Walczak,W A T Wan Abdullah,J Whitmore,K Wichmann,L Wiggers,M Wing,M Wlasenko,G Wolf,H Wolfe,K Wrona,A G Yaguesmolina, S Yamada,Y Yamazaki,R Yoshida,C Youngman,O Zabiegalov,A F Zarnecki,L Zawiejski,O Zenaiev, W Zeuner,B O Zhautykov,N Zhmak, A Zichichi,Z Zolkapli,D S Zotkin

PHYSICS LETTERS B（2013）

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摘要

The production of Z(0) bosons in the reaction ep -> eZ(0)p((*)), where p((*)) stands for a proton or a low-mass nucleon resonance, has been studied in ep collisions at HERA using the ZEUS detector. The analysis is based on a data sample collected between 1996 and 2007, amounting to 496 pb(-1) of integrated luminosity. The Z(0) was measured in the hadronic decay mode. The elasticity of the events was ensured by a cut on eta(max) <3.0, where eta(ma)x is the maximum pseudorapidity of energy deposits in the calorimeter defined with respect to the proton beam direction. A signal was observed at the Z(0) mass. The cross section of the reaction ep -> eZ(0)p((*)) was measured to be sigma(ep -> eZ(0)p((*))) = 0.13 +/- 0.06(stat.) +/- 0.01(syst) pb, in agreement with the Standard Model prediction of 0.16 pb. Thfs is the first measurement of Z(0) production in ep collisions. (C) 2012 Elsevier B.V. All rights reserved.

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