Study of taupair production at HERA

M Adamus,J M Pawlak,K Papageorgiu,L Bellagamba,V Schönberg,S Fourletov,E Ron,B Kamaluddin,R K Dementiev,N Zhmak,T Namsoo,B Kahle,G Bari,A Eskreys,A Longhin,D.S Zotkin,D Boscherini,K Olkiewicz,D Gladkov,O Behnke,M Kuze,S De Pasquale,S Antonelli,N Brümmer,V Bokhonov,F Dal Corso,H Kowalski,B Reisert,D Bot,M Basile,P Roloff,C Blohm,G Grzelak,A Kotański,D H Saxon,H Hartmann,U Kötz,M Turcato,K Mujkic,I Rubinsky,J Whyte,M Derrick,A Bruni,J Tomaszewska,M Przybycień,G Marini,B B Levchenko,A T Doyle,Y Eisenberg,S Bhadra,A Galas,D Hochman,A Nigro,F Januschek,S Limentani,P Stopa,S Dusini,P Göttlicher,B Foster,W B Schmidke,A Bertolin,B Musgrave,A Polini,I Gialas,O Gogota,W Hain,A Garfagnini,Y Iga,J Malka,L Zawiejski,P Kaur,A Bamberger,B A Dolgoshein,A Salii,M Wlasenko,F Karstens,Ie Korol,T Y Ling,K Horton,V Monaco,B Pawlik,C Youngman,E Hilger,O Bolilyi,P Łużniak,O Volynets,B Löhr,P G Pelfer,U Karshon,V Aushev,P Kulinski,S Kananov,A Keramidas,Z Zulkapli,L K Gladilin,D Szuba,S Magill,L S Durkin,D Notz,T Tymieniecka,B Brzozowska,R J Nowak,R Hori,V Drugakov,L Suszycki,A Raval,A N Barakbaev,M Jüngst,J Del Peso,U Samson,J Grebenyuk,R Ingbir,Y Aushev,G Sartorelli,S Schlenstedt,G Grigorescu,U Schneekloth,H Wolfe,F Mohamad Idris,T Tsurugai,R Yoshida,Yu A Golubkov,M Zolko,R Walczak,L Wiggers,U Noor,D Nicholass,I A Korzhavina,A Hüttmann,R Hamatsu,J Szuba,R Brugnera,T Kanno,K Oliver,J Ciborowski,A Stifutkin,A Parenti,T Theedt,E Brownson,O Bachynska,K Wrona,N Okazaki,G Barbagli,T Haas,J Behr,K Long ,P Schleper,A E Nuncio-Quiroz ,Z A Ibrahim,M Ruspa,J Ferrando,V Sola,G P Gach ,E Lohrmann,M Corradi,M Capua,Y.d Ri ,S Shimizu,D Reeder ,Inderpal Singh ,J F Martin,A Margotti,M Wing,A Caldwell,M Ishitsuka,I M Gregor ,Y Onishchuk ,J Maeda,A.s Proskuryakov ,G Susinno,W H Smith,C Uribe-Estrada ,J Terrón,H Tiecke,M Forrest,D Kisielewska,A Stern,G Wolf,E Koffeman,M.c.k Mattingly ,A Montanari,H Perrey,R Klanner,J H Loizides,M Arneodo,H Abramowicz,D Bartsch,N Vlasov ,S S Fang ,E.g Boos ,R.c.e Devenish ,I Katkov ,J M Butterworth,Z Ren,T Schörner-Sadenius ,A Geiser,J J Whitmore,I O Skillicorn ,L Cifarelli,F Barreiro,J Schwartz,T W Jones,V Libov,D Son,R Ciesielski,A I Robertson ,J Y Kim,A Savin ,F Cindolo,G Hartner,F Sciulli,M Costa,K Nagano,А Спиридонов ,E Lobodzinska,E Gallo,A M Cooper-Sarkar ,S Suchkov,H.‐P Jakob ,C Zhou,K Piotrzkowski,S Chekanov,A Contin,M Bindi,G Bruni,B.o Zhautykov ,P Bussey ,M I Ferrero,A Solano,L.m Shcheglova ,J Sztuk-Dambietz ,O Kuprash,O Yu Lukina,C Gwenlan,M Lisovyi,P Ermolov ,A Tapper ,D Dobur,І Каденко ,S Boutle ,G D’Agostini,Oleksandr Tomalak ,J Repond,M Kaur,A G Yagües-Molina ,P Kooijman,M Jiménez ,S Miglioranzi,Ning Ye ,I.-A Melzer-Pellmann ,R Aggarwal,А Антонов ,N Bartosik,B Bylsma,M Vázquez,U Klein,O Gueta,T Bołd ,Y Yamazaki,L Adamczyk,E Tassi,G Iacobucci,A Zichichi,A Verbytskyi,I Brock,A F Żarnecki ,S Kitamura,N Coppola,W Słomiński ,A Levy,C Glasman,I Makarenko,N S Pokrovskiy ,A Pellegrino,S Fazio,S Yamada,A Lee,R Shehzadi,C D Catterall,K Borras,F Corriveau,R Mankel,J Figiel,T P Stewart,W Lohmann,H Stadie,S Mergelmeyer,J D Morris,A Mastroberardino,B.y Oh ,L A Khein,W Perlański ,R Nania,E Paul,V Sosnovtsev,U Behrens,M Schioppa,D Lontkovskyi,G Dolinska,P Antonioli,J J Chwastowski ,R Carlin,W D Zeuner ,O Viazlo,R Sacchi,P Pluciński ,O Zenaiev,L Stančo ,K Tokushuku,J C Hart,I Grabowska-Bołd ,Wan Ahmad Tajuddin Wan Abdullah

doi:10.1007/jhep02(2011)117

Abstract

A study of events containing two tau leptons with high transverse momentum has been performed with the ZEUS detector at HERA, using a data sample corresponding to an integrated luminosity of 0.33 fb−1. The tau candidates were identified from their decays into electrons, muons or hadronic jets. The number of tau-pair candidates has been compared with the prediction from the Standard Model, where the largest contribution is expected from Bethe-Heitler processes. The total visible cross section was extracted. Standard Model expectations agree well with the measured distributions, also at high invariant mass of the tau pair.

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