arXiv 1306.04342013-06hep-phhep-lat

来自格点量子色动力学的具有形状因子的B -> Kll的标准模型预测

Standard Model predictions for B -> Kll with form factors from lattice QCD

Chris Bouchard, G. Peter Lepage, Christopher Monahan, Heechang Na, Junko Shigemitsu

备注：: 6 pages, 3 figures; v4 corrected error in evaluation of Wilson coefficient C9eff, resulting in <~ 1σ shift in observables; v3 matches version published in Phys. Rev. Lett; v2 updated to include comparison with most recent, and significantly more precise, results from LHCb. References updated
发表信息：: Phys. Rev. Lett. 111, 162002 (2013)
DOI：: 10.1103/PhysRevLett.111.162002

摘要：

我们计算，第一次使用非淬灭格点量子色动力学形状因子，标准模型微分分支分数$dB/dq^2(B \to Kll)$为$l=e, μ, τ$和比较与Belle，BABAR，CDF，和LHCb的实验测量。我们报告$q^2$箱中的$\mathcal{B}(B \to Kll)$用于实验和预测$\mathcal{B}(B \to K ττ) = (1.44 \pm 0.15) 10^{-7}$。我们还计算了支化分数比$R^μ_e = 1.00023(63)$和预测$R^τ_l = 1.159(40)$，$l=e, μ$。最后，我们计算的“平坦项”的角分布的差分衰减率$F_H^{e, μ, τ}$在实验动机$q^2$箱。

英文摘要：

We calculate, for the first time using unquenched lattice QCD form factors, the Standard Model differential branching fractions $dB/dq^2(B \to Kll)$ for $l=e, μ, τ$ and compare with experimental measurements by Belle, BABAR, CDF, and LHCb. We report on $\mathcal{B}(B \to Kll)$ in $q^2$ bins used by experiment and predict $\mathcal{B}(B \to K ττ) = (1.44 \pm 0.15) 10^{-7}$. We also calculate the ratio of branching fractions $R^μ_e = 1.00023(63)$ and predict $R^τ_l = 1.159(40)$, for $l=e, μ$. Finally, we calculate the "flat term" in the angular distribution of the differential decay rate $F_H^{e, μ, τ}$ in experimentally motivated $q^2$ bins.

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英文摘要：

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