Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.221801
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Funding
- CEA [CNRS/ IN2P3]
- FASI, Rosatom
- RFBR Russia
- CNPq
- FAPERJ
- DOE and NSF (USA)
- CEA and CNRS/IN2P3 (France)
- FASI, Rosatom, and RFBR (Russia)
- CNPq, FAPERJ, FAPESP, and FUNDUNESP (Brazil)
- DAE and DST (India)
- Colciencias (Colombia)
- CONACyT (Mexico
- KRF and KOSEF (Korea)
- CONICET and UBACyT (Argentina)
- FOM (The Netherlands)
- STFC (United Kingdom)
- MSMT and GACR (Czech Republic)
- CRC Program, CFI, NSERC, and WestGrid Project (Canada)
- BMBF and DFG (Germany)
- SFI (Ireland)
- The Swedish Research Council (Sweden)
- CAS and CNSF (China)
- Alexander von Humboldt Foundation (Germany)
- STFC [ST/F007418/1, ST/F00754X/1, PP/E000487/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/E000487/1, ST/F007418/1, ST/F00754X/1, PP/D004284/1] Funding Source: researchfish
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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.
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