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| 題名: | Measurement of the ratio B(t→Wb)/B(t→Wq) in pp collisions at s=8 TeV |
| 作者: | 林宗泰;Sirunyan, A.M.;Waltenberger, W.;Wulz, C.-E.;De Wolf, E.A.;Grebenyuk, A.;Beernaert, K.;Hammad, G.H.;Iaydjiev, P.;Marinov, A.;Liang, S.;Li, W.;Qian, S.J.;Zou, W.;Florez, C.;Nicolaou, C.;Givernaud, A.;Dahms, T.;Seidel, M.;Mozer, M.U.;Manthos, N.;Szillasi, Z.;Bhatnagar, V.;Shukla, P.;Mohanty, G.B.;Dugad, S.;Silvestris, L.;Abbiendi, G.;Fanfani, A.;Masetti, G.;Tosi, N.;Cappello, G.;Gonzi, S.;Fabbri, F.;Menichelli, M.;Biino, C.;Casasso, S.;Umer, T.;Park, S.K.;Lee, J.;Komaragiri, J.R.;Salazar Ibarguen, H.A.;Szleper, M.;Vorobyev, A.;Vorobyev, An;Semenov, S.;Sobol, A.;Benaglia, A.;Bloch, P.;Bocci, A.;Bondu, O.;Cerminara, G.;Krajczar, K.;Mannelli, M.;Sakulin, H.;Sharma, A.;Bäni, L.;Frazier, R.;Kreczko, L.;Lucas, C.;Thea, A.;Kenzie, M.;Reid, I.D.;St. John, J.;Cutts, D.;Kukartsev, G.;Breedon, R.;Malberti, M.;Barge, D.;Iiyama, Y.;Weng, Y.;Wittich, P.;Abdullin, S.;Fisk, I.;Hirschauer, J.;Vidal, R.;Dobur, D.;Rinkevicius, A.;Hewamanage, S.;Linn, S.;Prosper, H.;Baarmand, M.M.;Onel, Y.;Penzo, A.;Stringer, R.;Lu, Y.;Keller, J.;Chasco, M.;Massironi, A.;Orimoto, T.;Trocino, D.;Drozdetskiy, A.;Flowers, S.;Svyatkovskiy, A.;Somalwar, S.;Spanier, S.;Kamon, T.;Appelt, E.;Gurrola, A.;Lin, C.;Woods, N. |
| 貢獻者: | 理學院物理學系 |
| 關鍵詞: | CKM;CMS;HEP;hep-ex;High Energy Physics;PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;Top;Width |
| 日期: | 2014-09-07 |
| 上傳時間: | 2026-04-23 12:16:22 (UTC+8) |
| 出版者: | Netherlands: Elsevier B.V |
| 摘要: | 摘要： 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 tt¯ dilepton final state with proton–proton collision data at 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 |Vtb|>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, Γt=1.36±0.02(stat.)−0.11+0.14(syst.) GeV.
出版者： Netherlands: Elsevier B.V
出版日期： 2014-09-07
出處： Physics letters. B, 2014-09, Vol.736 (C), p.33-57
資源來源： Elsevier ScienceDirect Journals Complete **
版權： 2014 The Authors
識別號： ISSN: 0370-2693
識別號： EISSN: 1873-2445
識別號： DOI: 10.1016/j.physletb.2014.06.076 |
| 顯示於類別: | [物理學系] 期刊論文
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