Data di Pubblicazione:
2014
Abstract:
The ratio of the top-quark branching fractions R = B(t --> Wb)/B(t --> Wq), where the denominator includes the sum over all down-type quarks (q = b, s, d), is measured in the t (t) over bar dilepton final state with proton-proton collision data at root s = 8 TeV from an integrated luminosity of 19.7 fb(-1), collected with the CMS detector. In order to quantify the purity of the signal sample, the cross section is measured by fitting the observed jet multiplicity, thereby constraining the signal and background contributions. By counting the number of b jets per event, an unconstrained value of R = 1.014 +/- 0.003 (stat.) +/- 0.032 (syst.) is measured, in a good agreement with current precision measurements in electroweak and flavour sectors. A lower limit R > 0.955 at the 95% confidence level is obtained after requiring R <= 1, and a lower limit on the Cabibbo-Kobayashi-Maskawa matrix element |V-tb| > 0.975 is set at 95% confidence level. The result is combined with a previous CMS measurement of the t-channel single-top-quark cross section to determine the top-quark total decay width, Gamma(t) = 1.36 +/- 0.02 (stat.)(-0.11)(+0.14) (syst.) GeV.
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
Khachatryan V; Sirunyan AM; Tumasyan A; Adam W; Bergauer T; Dragicevic M; Ero J; Fabjan C; Friedl M; Fruwirth R; Ghete VM; Hartl C; Hormann N; Hrubec J; Jeitler M; Kiesenhofer W; Knunz V; Krammer M; Kratschmer I; Liko D; Mikulec I; Rabady D; Rahbaran B; Rohringer H; Schofbeck R; Strauss J; Taurok A; Treberer-Treberspurg W; Waltenberger W; Wulz CE; Mossolov V; Shumeiko N; Gonzalez JS; Alderweireldt S; Bansal M; Bansal S; Cornelis T; De Wolf EA; Janssen X; Knutsson A; Luyckx S; Ochesanu S; Roland B; Rougny R; Van de Klundert M; Van Haevermaet H; Van Mechelen P; Van Remortel N; Van Spilbeeck A; Blekman F; Blyweert S; D'Hondt J; Daci N; Heracleous N; Kalogeropoulos A; Keaveney J; Kim TJ; Lowette S; Maes M; Olbrechts A; Python Q; Strom D; Tavernier S; Van Doninck W; Van Mulders P; Van Onsem GP; Villella I; Caillol C; Clerbaux B; De Lentdecker G; Favart L; Gay APR; Grebenyuk A; Leonard A; Marage PE; Mohammadi A; Pernie L; Reis T; Seva T; Thomas L; Vander Velde C; Vanlaer P; Wang J; Adler V; Beernaert K; Benucci L; Cimmino A; Costantini S; Crucy S; Dildick S; Fagot A; Garcia G; Klein B; Mccartin J; Rios AAO; Ryckbosch D; Diblen SS; Sigamani M; Strobbe N; Thyssen F; Tytgat M; Yazgan E; Zaganidis N; Basegmez S; Beluffi C; Bruno G; Castello R; Caudron A; Ceard L; Da Silveira GG; Delaere C; du Pree T; Favart D; Forthomme L; Giammanco A; Hollar J; Jez P; Komm M; Lemaitre V; Liao J; Nuttens C; Pagano D; Pin A; Piotrzkowski K; Popov A; Quertenmont L; Selvaggi M; Marono MV; Garcia JMV; Beliy N; Caebergs T; Daubie E; Hammad GH; Alves GA; Martins MC; Martins TD; Pol ME; Alda WL; Carvalho W; Chinellato J; Custodio A; Da Costa EM; Damiao DD; Martins CD; De Souza SF; Malbouisson H; Malek M; Figueiredo DM; Mundim L; Nogima H; Da Silva WLP; Santaolalla J; Santoro A; Sznajder A; Manganote EJT; Pereira AV; Bernardes CA; Dias FA; Tomei TRFP; Gregores EM; Mercadante PG; Novaes SF; Padula SS; Genchev V; Iaydjiev P; Marinov A; Piperov S; Rodozov M; Sultanov G; Vutova M; Dimitrov A; Glushkov I; Hadjiiska R; Kozhuharov V; Litov L; Pavlov B; Petkov P; Bian JG; Chen GM; Chen HS; Chen M; Du R; Jiang CH; Liang D; Liang S; Plestina R; Tao J; Wang X; Wang Z; Asawatangtrakuldee C; Ban Y; Guo Y; Li Q; Li W; Liu S; Mao Y; Qian SJ; Wang D; Zhang L; Zou W; Avila C; Sierra LFC; Florez C; Gomez JP; Moreno BG; Sanabria JC; Godinovic N; Lelas D; Polic D; Puljak I; Antunovic Z; Kovac M; Brigljevic V; Kadija K; Luetic J; Mekterovic D; Morovic S; Sudic L; Attikis A; Mavromanolakis G; Mousa J; Nicolaou C; Ptochos F; Razis PA; Bodlak M; Finger M; Finger M; Assran Y; Kamel AE; Mahmoud MA; Radi A; Kadastik 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; Lethuill
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