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arXiv 1507.08925hep-ex
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用ATLAS探测器测定$\sqrt{s}=7$ TeV的PDMATHAAA AC碰撞中$b$ -夸克碎裂分数$f_s/f_d$的比值

Determination of the ratio of $b$-quark fragmentation fractions $f_s/f_d$ in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector

ATLAS Collaboration

备注：
8 pages plus author list + cover pages (25 pages total), 2 figures, 1 table, submitted to Physical Review Letters, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2014-02/
发表信息：
Phys. Rev. Lett. 115, 262001 (2015)
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摘要：

利用ATLAS实验记录的2.47 fb $^{-1}$的积分光度值，用$\sqrt{s}=7$ TeV的$pp$碰撞产生的$B$介子的排它衰变$B_{s}^{0}\rightarrow J/ψϕ$和$B_{d}^{0}\rightarrow J/ψK^{*0}$来确定$f_s/f_d$碎裂分数的比值.从观察到的$B_{s}^{0}\rightarrow J/ψϕ$和$B_{d}^{0}\rightarrow J/ψK^{*0}$产率，测得$\frac{f_s}{f_d}\frac{\mathcal{B}(B_{s}^{0} \rightarrow J/ψϕ)}{\mathcal{B}(B_{d}^{0} \rightarrow J/ψK^{*0})}$的量为0.199 $\pm$ 0.004（stat）$\pm$ 0.008（sys）。使用最近对$\frac{\mathcal{B}(B_{s}^{0}\rightarrow J/ψϕ)}{\mathcal{B}(B_{d}^{0}\rightarrow J/ψK^{*0})}$的理论预测，得到$\frac{f_s}{f_d} =$ 0.240 $\pm$ 0.004（stat）$\pm$ 0.010（sys）$\pm$ 0.017（th）。这一结果是基于一种新的方法，该方法大大提高了世界平均水平。

英文摘要：

With an integrated luminosity of 2.47 fb$^{-1}$ recorded by the ATLAS experiment at the LHC, the exclusive decays $B_{s}^{0}\rightarrow J/ψϕ$ and $B_{d}^{0}\rightarrow J/ψK^{*0}$ of $B$ mesons produced in $pp$ collisions at $\sqrt{s}=7$ TeV are used to determine the ratio of fragmentation fractions $f_s/f_d$. From the observed $B_{s}^{0}\rightarrow J/ψϕ$ and $B_{d}^{0}\rightarrow J/ψK^{*0}$ yields, the quantity $\frac{f_s}{f_d}\frac{\mathcal{B}(B_{s}^{0} \rightarrow J/ψϕ)}{\mathcal{B}(B_{d}^{0} \rightarrow J/ψK^{*0})}$ is measured to be 0.199 $\pm$ 0.004(stat) $\pm$ 0.008(sys). Using a recent theory prediction for $\frac{\mathcal{B}(B_{s}^{0}\rightarrow J/ψϕ)}{\mathcal{B}(B_{d}^{0}\rightarrow J/ψK^{*0})}$ yields $\frac{f_s}{f_d} =$ 0.240 $\pm$ 0.004(stat) $\pm$ 0.010(sys) $\pm$ 0.017(th). This result is based on a new approach that provides a significant improvement of the world average.

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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