Search for pair production of the scalar top quark in muon + tau final states

V M Abazov ,M Naimuddin,M Cooke,T Hoang,C Schwanenberger,G Obrant,D Menezes,M Buehler,D Wicke,B Åsman,I Ripp-Baudot,S Chevalier-Théry,M Padilla,E De La Cruz-Burelo,W Ye,S Chakrabarti,S Söldner-Rembold,T Scanlon,M Jaffré,P Neustroev,B Hoeneisen,R Madar,Y Peters,R Yamada,R Van Kooten,B Sanghi,P Rubinov,J Orduna,G Savage,E Kajfasz,A Jayasinghe,G Golovanov,S Banerjee,L Welty-Rieger,R Illingworth,S Kermiche,A Patwa,J Hays,J Weichert,K Devaughan,D Smirnov,S Greder,S Fuess,R Magaña-Villalba,Y Scheglov,S Blessing,V Shary,D Boline,B Baldin,A Meyer,P Lebrun,H Greenlee,P Salcido,B Penning,J Snow,B Tuchming,P Skubic,A Lobodenko,A Evdokimov,M Diesburg,P Polozov,J Lellouch,F Badaud,D Edmunds,D Chakraborty,J Backusmayes,T Nunnemann,I Katsanos,M Prewitt,A Alton,M Rominsky,Y Ilchenko,P Verdier,A Chandra,S Atkins,M Merkin,V Hynek,N Parua,N Osman,U Bassler,J Warchol,T Dorland,J Ellison,B Quinn,P Renkel,T Schliephake,A Croc,R Jesik,O Atramentov,D Karmanov,J Osta,A Melnitchouk,V Bunichev,A Bross,D Denisov,H Hegab,M Fortner,S Cihangir,P Svoisky,G Grenier,R Piegaia,J Sekaric,G Alkhazov,M Hohlfeld,N Khalatyan,J Martínez-Ortega,M Eads,L Stutte,G Sajot,A Boehnlein,A Jonckheere,W Geng,T Yasuda,D Vilanova,L Han,L Bellantoni,V Sirotenko,S Uvarov,M Vesterinen,I Heredia-De La Cruz,D Jamin,S Schlobohm,T Head,F Miconi,L Bagby,K Yip,J Barreto,E Camacho-Pérez,G Ginther,A Pal,R Partridge,D Hedin,H Schellman,I Razumov,S Uzunyan,J Clutter,V Parihar,R Beuselinck,K Herner,K Tschann-Grimm,R Bernhard,Q Z Li ,A S Santos ,L Li,M Lokajı́ček ,S J De Jong ,J M Kohli ,R Brock,A Kharchilava,S W Cho ,M Zieliński ,B Abbott,T H Burnett ,H Severini,V Stolin,S Bhatia,J P Negret ,P A Kasper ,M Strauss,L Sonnenschein,G W Wilson ,Arun Das ,M Hildreth ,G A García-Guerra ,Y A Yatsunenko ,D Strom,M Begalli,G Watts,Z Hubáček ,R Démina ,N Prokopenko,N Varelas,L S Vertogradov ,R Schwienhorst,K Bloom,G Blazey,E Shabalina,M Wobisch,R Ruchti,Ph Gris,H A Neal ,T Kurča,M Perfilov,D R Claes ,S Dutt,G Hamel De Monchenault ,A Dyshkant,G Landsberg,A Ross,L Uvarov,Y Liu,S B Beri ,R K Shivpuri ,H J Lubatti ,S Snyder,D Ćutts ,T Ferbel,S Hagopian,E Boos ,D Tsybychev,D Duggan,J F Bartlett ,M Aoki,J Kraus,F Déliot,H E Fisk ,J.-F Grivaz,S Grünendahl,J Hobbs ,Y Xie,V L Malyshev ,V Gavrilov,A K.a Maciel ,A Dubey,G Davies,P C Bhat ,B Calpas,K A Johns ,X B Bu ,K Kaadze,H S Lee ,G J Otero Y Garzón ,K Petridis,P N Ratoff ,S P Denisov ,A G Goussiou ,P G Mercadante ,V V Lipaev ,W E Cooper ,K Augsten,F Filthaut,E W Varnes ,D Brown,L Sawyer,Arun Kumar ,J Joshi,A Quadt,C Bélanger-Champagne ,D A Stoyanova ,K Soustružnı́k ,T Guillemin,P Pétroff,R Lipton,S Jabeen,L Suter,D Wood ,T Hebbeker,C Deterre,A P Heinson ,M Grünewald ,É Chapon ,W M Van Leeuwen ,M R Adams ,P L.m Podesta-Lerma ,C L Mcgivern ,B C Choudhary ,J Meyer,P Slattery,A S Ito ,O Brandt,U Heintz,E Barberis,M Corcoran,A Duperrin,P Jönsson ,A Popov ,G Gutiérrez ,M Weber,A Juste Rozas ,A Dominguez,Y N Kharzheev ,V Bhatnagar,Sung Wook Choi ,Rafael De ,S W Youn ,S Kulikov,D V Bandurin ,D Lincoln,M Verzocchi,A W Jung ,K Harder,V D Elvira ,A L Lyon ,J M Hauptman ,P Gutiérrez ,R Luna-García ,A García-Bellido ,A Brandt,A Haas,R Kehoe,J Linnemann,S Malik,V Šimák ,S Desai,H Li,S Lammers,D Mackin,A Grohsjean,W C Yang ,Michael Wang ,H Castilla‐Valdez ,R D Schamberger ,Jaehoon Lim ,M Wayne,A White,W M Lee ,A A Shchukin ,M M Meijer ,V A Kuzmin ,J Qian,P Baringer,N K Mondal ,M A Carrasco-Lizarraga ,H T Diehl ,T Zhao,C P Buszello ,I A Vasilyev ,G Petrillo,J Stark,V M Podstavkov ,K Ranjan,T Bose,P Vokáč ,M P Sanders ,D Price,R Hirosky,A Bean,S Burdin,J Brown,V E Bazterra ,Y T Tsai ,I Iashvili,Y Gershtein,M Takahashi,K M Chan ,G Chen,N Parashar,J Zhu,Mark Richard James Williams ,L Dudko ,E Nagy,S K Park ,M Besançon,C Hensel,D Gerbaudo,F Fiedler,D Ziemińska ,V Buescher,В Н Евдокимов ,M Narain,G Brooijmans,A V Kozelov ,W C Fisher ,I A Bertram ,C Royon,G R Snow ,P D Grannis ,G Borissov,G S Muanza ,A Kupčo ,M C Cousinou ,A Askew,G Facini,M Johnson,Y Enari,D K Cho ,A Sánchez-Hernández,G Safronov,G D Alexeev ,C Ávila ,A Khanov,G G Hesketh ,M Titov,B S Acharya ,F Rizatdinova,M S Rangel ,S M Lietti ,H Fox,H Evans,S F Novaes ,C E Gerber ,H Yin,E M Gregores ,T R Wyatt ,A J Tanasijczuk ,Z Ye,A Harel,C Tully,M A Pleier ,M Mulhearn,S W Lee ,K Smith ,R L Mccarthy ,T Adams,R Nayyar,P F Ding ,F Couderc,M Rijssenbeek,H D Wahl ,Y Maravin,G Bernardi,B Zhou,B C.k Casey ,V V Tokmenin ,Z D Greenwood ,J Haley,V A Bezzubov ,L Živković

doi:10.1016/j.physletb.2012.03.028

Abstract

We present a search for the pair production of scalar top quarks (t˜1), the lightest supersymmetric partners of the top quarks, in pp¯ collisions at a center-of-mass energy of 1.96 TeV, using data corresponding to an integrated luminosity of 7.3 fb−1 collected with the D0 experiment at the Fermilab Tevatron Collider. Each scalar top quark is assumed to decay into a b quark, a charged lepton, and a scalar neutrino (ν˜). We investigate final states arising from t˜1t˜¯1→bb¯μτν˜ν˜ and t˜1t˜¯1→bb¯ττν˜ν˜. With no significant excess of events observed above the background expected from the standard model, we set exclusion limits on this production process in the (mt˜1,mν˜) plane.

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