Chinese Physics C > 2017, Vol. 41 > Issue(6): 063101 DOI: 10.1088/1674-1137/41/6/063101

A general analysis of Wtb anomalous couplings

Qing-Hong Cao^1,2,3,,,
Bin Yan^1,,,
Jiang-Hao Yu^4,,,
Chen Zhang^1,,

1.
Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
2.
Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
3.
Center for High Energy Physics, Peking University, Beijing 100871, China
4.
Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
5.
Amherst Center for Fundamental Interactions, Department of Physics, University of Massachusetts-Amherst, Amherst, MA 01003, U.S.A.

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Abstract：
We investigate new physics effects on the Wtb effective couplings in a model-independent framework. The new physics effects can be parametrized by four independent couplings, f ₁ ^L, f ₁ ^R, f ₂ ^Land f ₂ ^R. We further introduce a set of parameters x ₀, x _m, x _pand x ₅which exhibit a linear relation to the single top production cross sections. Using recent data for the t-channel single top production cross section σ _t, tW associated production cross section σ _tW, s-channel single top production cross section σ _s, and W-helicity fractions F ₀, F _Land F _Rcollected at the 8 TeV LHC and Tevatron, we perform a global fit to impose constraints on the top quark effective couplings. Our global fitting results show that the top quark effective couplings are strongly correlated. We show that (i) improving the measurements of σ _tand σ _tWis important in constraining the correlation of ( f ₁ ^R, f ₂ ^R) and ( f ₂ ^L, f ₂ ^R); (ii) f ₁ ^Land f ₂ ^Rare anti-correlated, and are sensitive to all the four experiments; (iii) f ₁ ^Rand f ₂ ^Lare also anti-correlated, and are sensitive to the F ₀and F _Lmeasurements; (iv) the correlation between f ₂ ^Land f ₂ ^Ris sensitive to the precision of the σ _t, σ _tWand F ₀measurements. The effective Wtb couplings are studied in three kinds of new physics models: the G(221)= SU(2) ₁⊗ SU(2) ₂⊗ U(1) _Xmodels, the vector-like quark models and the Littlest Higgs model with and without T-parity. We show that the Wtb couplings in the left-right model and the un-unified model are sensitive to the ratio of gauge couplings when the new heavy gauge boson's mass ( M _W') is less than several hundred GeV, but the constraint is loose if M _W'>1 TeV. Furthermore, the Wtb couplings in vector-like quark models and the Littlest Higgs models are sensitive to the mixing angles of new heavy particles and SM particles.
- top quark,
- TeV physics,
- anomalous coupling

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Qing-Hong Cao, Bin Yan, Jiang-Hao Yu and Chen Zhang. A general analysis of Wtb anomalous couplings[J]. Chinese Physics C, 2017, 41(6): 063101. doi: 10.1088/1674-1137/41/6/063101

Qing-Hong Cao, Bin Yan, Jiang-Hao Yu and Chen Zhang. A general analysis of Wtb anomalous couplings[J]. Chinese Physics C, 2017, 41(6): 063101. doi:10.1088/1674-1137/41/6/063101 shu

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Supported by National Science Foundation of China (11275009, 11675002, 11635001), National Science Foundation (PHY-1315983, PHY-1316033) and DOE (DE- SC0011095)}

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A general analysis of Wtb anomalous couplings

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A general analysis of Wtb anomalous couplings

Corresponding author:Qing-Hong Cao,

Corresponding author:Bin Yan,

Corresponding author:Jiang-Hao Yu,

Corresponding author:Chen Zhang,

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