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arXiv 1801.08259hep-phhep-ex
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根据$R(D^{(*)})$测量研究包含$B \to X_c\ell \barν$衰变的新物理

New physics in inclusive $B \to X_c\ell \barν$ decay in light of $R(D^{(*)})$ measurements

Saeed Kamali, Ahmed Rashed, Alakabha Datta

摘要:

本文研究了具有不同Lorentz结构的新物理算符对包含$B \to X_cτ\barν$衰变的影响,并对总衰变率$R(X_c)=\frac{Γ(B \to X_cτ\barν_τ)}{Γ(B \to X_c \ell \barν_\ell)}$与$\ell=e, μ$之比、微分衰变率$\frac{dΓ}{dq^2}$与$\frac{dΓ}{dE_τ}$、前后不对称性$A_{FB}$以及微分衰变率之比$B(q^2)=\frac{dΓ(B \to X_cτ\barν_τ)/dq^2}{dΓ(B \to X_c \ell \barν_\ell)/dq^2}$进行了预言.此外,我们还引入了一些细夸克模型作为NP算符的显式模型,并研究了它们对包含衰变的影响。我们认为$\mathcal{O}(α_s)$辐射和$1/m_b$非微扰修正的标准模型(SM)的衰变率,忽略它们的小影响,在NP的贡献。

英文摘要:

In this work we study the effects of new-physics (NP) operators with different Lorentz structures on the inclusive $B \to X_cτ\barν$ decay and make predictions for the ratio of total decay rates $R(X_c)=\frac{Γ(B \to X_cτ\barν_τ)}{Γ(B \to X_c \ell \barν_\ell)}$ with $\ell=e, μ$, the differential decay rates, $\frac{dΓ}{dq^2}$ and $\frac{dΓ}{dE_τ}$, forward-backward asymmetry $A_{FB}$ and the ratio of the differential decay rates $B(q^2)=\frac{dΓ(B \to X_cτ\barν_τ)/dq^2}{dΓ(B \to X_c \ell \barν_\ell)/dq^2}$. In addition, we introduce some leptoquark models as explicit models of the NP operators and study their effects on the inclusive decay. We consider $\mathcal{O}(α_s)$ radiative and $1/m_b$ nonperturbative corrections to the Standard Model (SM) decay rate and ignore their small effects in the NP contributions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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