arXiv 1202.04102012-02-02hep-ex

支化分数比的测量$\frac{\mathcal{BR}(B^0\to K^*γ)}{\mathcal{BR}(B_s^0\toϕγ)}$

Measurement of the ratio of branching fractions $\frac{\mathcal{BR}(B^0\to K^*γ)}{\mathcal{BR}(B_s^0\toϕγ)}$

Savrina Daria

备注：: Presented at the 2011 Hadron Collider Physics symposium (HCP-2011), Paris, France, November 14-18 2011, 3 pages, 2 figures
DOI：: 10.1051/epjconf/20122812031

摘要：

对LHCb中B介子辐射衰变的研究主要是由于对$B_s^0\toϕγ$衰变过程中光子偏振的测量，这可能为标准模型提供一个灵敏的探测。LHCb实验于2010年开始在$\sqrt{s} = 7 TeV$的能量下进行数据采集，本文介绍了2011年上半年利用$340 pb^{-1}$数据对两种罕见辐射衰变$B^0\to K^*γ$和$B_s^0\toϕγ$的研究结果。利用该数据，我们得到了$\frac{\mathcal{BR}(B^0\to K^*γ)}{\mathcal{BR}(B_s^0\toϕγ)} = 1.52\pm0.14(stat.)\pm0.10(syst.)\pm0.12(f_s/f_d)$的初步测量值，并假设测量值为$\mathcal{B}(B^0\to K^*γ) = (4.33 \pm 0.15)\times10^{-5}$，我们推断出$\mathcal{B}(B_s^0\to ϕγ) = (2.8\pm0.5)\times10^{-5}$ \cite{bib:conf}。

英文摘要：

The interest to the rare radiative decays of the B-mesons at LHCb is mostly aroused due to the measurement of the photon polarization in the $B_s^0\toϕγ$ decay, which may provide a sensitive probe for the Standard Model. The LHCb experiment has started to take data at the energy of $\sqrt{s} = 7 TeV$ in 2010 and the current paper presents the result of the studies of the two rare radiative decays $B^0\to K^*γ$ and $B_s^0\toϕγ$ with $340 pb^{-1}$ of data taken in the first half of 2011. With this data we have a preliminary measurement of $\frac{\mathcal{BR}(B^0\to K^*γ)}{\mathcal{BR}(B_s^0\toϕγ)} = 1.52\pm0.14(stat.)\pm0.10(syst.)\pm0.12(f_s/f_d)$ and assuming the measured value of $\mathcal{B}(B^0\to K^*γ) = (4.33 \pm 0.15)\times10^{-5}$ we infer $\mathcal{B}(B_s^0\to ϕγ) = (2.8\pm0.5)\times10^{-5}$ \cite{bib:conf}.

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