期刊
PHYSICAL REVIEW D
卷 85, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.85.091104
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资金
- DOE
- NSF (USA)
- CEA
- CNRS/IN2P3 (France)
- FASI
- Rosatom
- RFBR (Russia)
- CNPq
- FAPERJ
- FAPESP
- FUNDUNESP (Brazil)
- DAE
- DST (India)
- UBACyT (Argentina)
- FOM (The Netherlands)
- STFC
- Royal Society (United Kingdom)
- MSMT
- GACR (Czech Republic)
- BMBF
- DFG (Germany)
- SFI (Ireland)
- Swedish Research Council (Sweden)
- CAS
- CNSF (China)
- Colciencias (Colombia)
- CONACyT (Mexico)
- NRF (Korea)
- STFC [ST/K001604/1, ST/K50208X/1, PP/E000487/1, ST/F00754X/1, ST/F007418/1, ST/H00095X/1, ST/J501074/1, ST/K000713/1, ST/M000664/1, ST/H00095X/2, ST/K001388/1, ST/I505756/1] Funding Source: UKRI
- Division Of Physics
- Direct For Mathematical & Physical Scien [1066578] Funding Source: National Science Foundation
- ICREA Funding Source: Custom
- Science and Technology Facilities Council [ST/H00095X/2, ST/K001604/1 CMS Upgrade, ST/K001604/1 SuperNEMO, ST/K001604/1 LHCb, PP/E000487/1, ST/M000664/1, ST/J501074/1, ST/K001604/1 T2K, ST/H00095X/1, ST/K001604/1, ST/F007418/1, ST/K50208X/1, ST/K000713/1, PP/D004284/1, ST/K001388/1, ST/K001604/1 DMUK, ST/K001604/1 LHCb Upgrades, ST/K001604/1 GRIDPP, ST/K001604/1 MICE/UKNF, ST/F00754X/1, ST/I505756/1] Funding Source: researchfish
We present an improved determination of the total width of the top quark, Gamma(t), using 5.4 fb(-1) of integrated luminosity collected by the D0 Collaboration at the Tevatron p (p) over bar Collider. The total width Gamma(t) is extracted from the partial decay width Gamma(t -> Wb) and the branching fraction B(t -> Wb). Gamma(t -> Wb) is obtained from the t-channel single top-quark production cross section and B(t -> Wb) is measured in t (t) over bar events. For a top mass of 172.5 GeV, the resulting width is Gamma(t) = 2.00(-0.43)(+0.47) GeV. This translates to a top-quark lifetime of tau(t) = (3.29(-0.63)(+0.90)) x 10(-25) s. We also extract an improved direct limit on the Cabibbo-Kobayashi-Maskawa quark-mixing matrix element 0.81 < vertical bar V-tb vertical bar <= 1 at 95% C.L. and a limit of vertical bar V-tb'vertical bar < 0.59 for a high-mass fourth-generation bottom quark assuming unitarity of the fourth-generation quark-mixing matrix.
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