Measurement of top quark–antiquark pair production in association with a W or Z boson in pp collisions at √s = 8 TeV
Articolo
Data di Pubblicazione:
2014
Abstract:
A measurement of the cross section for the production of top quark–antiquark pairs (tt) in association with a vector boson V (W or Z) in proton-proton collisions at √s = 8 TeV is presented. The results are based on a dataset corresponding to an integrated luminosity of 19.5 fb−1 recorded with the CMS detector at the LHC. The measurement is performed in three leptonic (e and µ) channels: a same-sign dilepton analysis targeting ttW events, and trilepton and four-lepton analyses designed for ttZ events. In the same-sign dilepton channel, the ttW cross section is measured as σ(ttW) = 170+90−80 (stat) ± 70 (syst) fb, corresponding to a significance of 1.6 standard deviations over the background-only
hypothesis. Combining the trilepton and four-lepton channels, a direct measurement of the ttZ cross section, σ(ttZ) = 200+80−70 (stat)+40−30 (syst) fb, is obtained with a significance
of 3.1 standard deviations. The measured cross sections are compatible with standard model predictions within their experimental uncertainties. The inclusive ttV process is observed with a significance of 3.7 standard deviations from the combination of all three leptonic channels.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
CMS, top quark
Elenco autori:
tik M; Murumaa M; Raidal M; Tiko A; Eerola P; Fedi G; Voutilainen M; Harkonen J; Karimaki V; Kinnunen R; Kortelainen MJ; Lampen T; Lassila-Perini K; Lehti S; Linden T; Luukka P; Maenpaa T; Peltola T; Tuominen E; Tuominiemi J; Tuovinen E; Wendland L; Tuuva T; Besancon M; Couderc F; Dejardin M; Denegri D; Fabbro B; Faure JL; Favaro C; Ferri F; Ganjour S; Givernaud A; Gras P; de Monchenault GH; Jarry P; Locci E; Malcles J; Nayak A; Rander J; Rosowsky A; Titov M; Baffioni S; Beaudette F; Busson P; Charlot C; Dahms T; Dalchenko M; Dobrzynski L; Filipovic N; Florent A; de Cassagnac RG; Mastrolorenzo L; Minee P; Mironov C; Naranjo IN; Nguyen M; Ochando C; Paganini P; Salerno R; Sauvan JB; Sirois Y; Veelken C; Yilmaz Y; Zabi A; Agram JL; Andrea J; Aubin A; Bloch D; Brom JM; Chabert EC; Collard C; Conte E; Fontaine JC; Gele D; Goerlach U; Goetzmann C; Le Bihan AC; Van Hove P; Gadrat S; Beauceron S; Beaupere N; Boudoul G; Brochet S; Montoya CAC; Chasserat J; Chierici R; Contardo D; Depasse P; El Mamouni H; Fan J; Fay J; Gascon S; Gouzevitch M; Ille B; Kurca T; Lethuillier M; Mirabito L; Perries S; Alvarez JDR; Sabes D; Sgandurra L; Sordini V; Vander Donckt M; Verdier P; Viret S; Xiao H; Tsamalaidze Z; Autermann C; Beranek S; Bontenackels M; Calpas B; Edelhoff M; Feld L; Hindrichs O; Klein K; Ostapchuk A; Perieanu A; Raupach F; Sammet J; Schael S; Sprenger D; Weber H; Wittmer B; Zhukov V; Ata M; Caudron J; Dietz-Laursonn E; Duchardt D; Erdmann M; Fischer R; Guth A; Hebbeker T; Heidemann C; Hoepfner K; Klingebiel D; Knutzen S; Kreuzer P; Merschmeyer M; Meyer A; Olschewski M; Padeken K; Papacz P; Reithler H; Schmitz SA; Sonnenschein L; Teyssier D; Thuer S; Weber M; Cherepanov V; Erdogan Y; Flugge G; Geenen H; Geisler M; Ahmad WH; Hoehle F; Kargoll B; Kress T; Kuessel Y; Lingemann J; Nowack A; Nugent IM; Perchalla L; Pooth O; Stahl A; Asin I; Bartosik N; Behr J; Behrenhoff W; Behrens U; Bell AJ; Bergholz M; Bethani A; Borras K; Burgmeier A; Cakir A; Calligaris L; Campbell A; Choudhury S; Costanza F; Pardos CD; Dooling S; Dorland T; Eckerlin G; Eckstein D; Eichhorn T; Flucke G; Garcia JG; Geiser A; Gunnellini P; Hauk J; Hellwig G; Hempel M; Horton D; Jung H; Kasemann M; Katsas P; Kieseler J; Kleinwort C; Krucker D; Lange W; Leonard J; Lipka K; Lohmann W; Lutz B; Mankel R; Marfin I; Melzer-Pellmann IA; Meyer AB; Mnich J; Mussgiller A; Naumann-Emme S; Novgorodova O; Nowak F; Ntomari E; Perrey H; Pitzl D; Placakyte R; Raspereza A; Cipriano PMR; Ron E; Sahin MO; Salfeld-Nebgen J; Saxena P; Schmidt R; Schoerner-Sadenius T; Schroder M; Trevino ADRV; Walsh R; Wissing C; Martin MA; Blobel V; Vignali MC; Erfle J; Garutti E; Goebel K; Gorner M; Gosselink M; Haller J; Hoing RS; Kirschenmann H; Klanner R; Kogler R; Lange J; Lapsien T; Lenz T; Marchesini I; Ott J; Peiffer T; Pietsch N; Rathjens D; Sander C; Schettler H; Schleper P; Schlieckau E; Schmidt A; Seidel M; Sibille J; Sola V; Stadie H; Steinbruck G; Troendle D; Usai E; Vanelderen L; Barth C; Baus C; Berger J; Boser C; Butz E; Chwalek T; De Boer W; Descroix A; Dierlamm A; Feindt M; Guthoff M; Hartmann F; Hauth T; Husemann U; Katkov I; Kornmayer A; Kuznetsova E; Pardo PL; Mozer MU; Muller T; Nurnberg A; Quast G; Rabbertz K; Ratnikov F; Rocker S; Simonis HJ; Stober FM; Ulrich R; Wagner-Kuhr J; Wayand S; Weiler T; Anagnostou G; Daskalakis G; Geralis T; Giakoumopoulou VA; Kyriakis A; Loukas D; Markou A; Markou C; Psallidas A; Topsis-Giotis I; Gouskos L; Panagiotou A; Saoulidou N; Stiliaris E; Aslanoglou X; Evangelou I; Flouris G; Foudas C; Kokkas P; Manthos N; Papadopoulos I; Paradas E; Bencze G; Hajdu C; Hidas P; Horvath D; Sikler F; Veszpremi V; Vesztergombi G; Zsigmond AJ; Beni N; Czellar S; Karancsi J; Molnar J; Palinkas J; Szillasi Z; Raics P; Trocsanyi ZL; Ujvari B; Swain SK; Beri SB; Bhatnagar V; Dhingra N; Gupta R; Kalsi AK; Kaur M; Mittal M; Nishu N; Singh JB; Kumar A; Kumar A; Ahuja S; Bhardwaj A; Choudhary BC; Kumar A; Malhotra S; Naimuddin M; Ranjan K; Sharma V; Banerjee S; Bhattacharya S
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