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http://acervodigital.unesp.br/handle/11449/24379- Title:
- Search for Anomalous Wtb Couplings in Single Top Quark Production
- Abazov, V. M.
- Abbott, B.
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- Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)
- Department of Energy (DOE) and National Science Foundation (NSF) - USA
- Institut national de physique nucléaire et de physique des particules (IN2P3/CNRS)
- Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
- Department of Science and Technology (DST) - India
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- In 0.9 fb(-1) of pp collisions, the D0 Collaboration presented evidence for single top quark production in events with an isolated lepton, missing transverse momentum, and two to four jets. We examine these data to study the Lorentz structure of the Wtb coupling. The standard model predicts a left-handed vector coupling at the Wtb vertex. The most general lowest dimension, CP-conserving Lagrangian admits right-handed vector and left- or right-handed tensor couplings as well. We find that the data prefer the left-handed vector coupling and set upper limits on the anomalous couplings. These are the first direct constraints on a general Wtb interaction and the first direct limits on left- and right-handed tensor couplings.
- 28-Nov-2008
- Physical Review Letters. College Pk: Amer Physical Soc, v. 101, n. 22, p. 7, 2008.
- 7
- Amer Physical Soc
- http://dx.doi.org/10.1103/PhysRevLett.101.221801
- http://hdl.handle.net/11449/24379
- Acesso restrito
- outro
- http://repositorio.unesp.br/handle/11449/24379
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