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arXiv 1012.3138hep-ex
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sqrt（s）=1.96TeV p-pbar碰撞中含a J/psi的排他衰变中b强子寿命的测量

Measurement of b hadron lifetimes in exclusive decays containing a J/psi in p-pbar collisions at sqrt(s)=1.96TeV

T. Aaltonen et al.

备注：
revised version. accepted for PRL publication
发表信息：
Phys.Rev.Lett.106:121804,2011
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摘要：

我们报告了在完全重建的衰变模式B^+ -->J/Psi K+，B^0 --> J/Psi K*，B^0--> J/Psi Ks和Lambda_b --> J/Psi Lambda中测量$b$ -强子寿命的结果，使用的数据对应于积分亮度为4.3 ${\rm fb}^{-1}$，由费米实验室Tevatron的CDF II探测器收集。测得的寿命为$τ$ B^+ = $1.639 \pm 0.009 ({\rm stat}) \pm 0.009 {\rm (syst) ~ ps}$、$τ$ B^0 = $1.507 \pm 0.010 ({\rm stat}) \pm 0.008 {\rm (syst) ~ ps}$和$τ$ Lambda_b = $1.537 \pm 0.045 ({\rm stat}) \pm 0.014 {\rm (syst) ~ ps}$。寿命比为$τ$ B^+/ $τ$ B^0 = $1.088 \pm 0.009 ({\rm stat})\pm 0.004 ({\rm syst})$和$τ$ λ_b/ $τ$ B^0 = $1.020 \pm 0.030 ({\rm stat})\pm 0.008 ({\rm syst})$。这些是从一个实验中得到的这些量的最精确的测定。

英文摘要：

We report on a measurement of $b$-hadron lifetimes in the fully reconstructed decay modes B^+ -->J/Psi K+, B^0 --> J/Psi K*, B^0 --> J/Psi Ks, and Lambda_b --> J/Psi Lambda using data corresponding to an integrated luminosity of 4.3 ${\rm fb}^{-1}$, collected by the CDF II detector at the Fermilab Tevatron. The measured lifetimes are $τ$B^+ = $1.639 \pm 0.009 ({\rm stat}) \pm 0.009 {\rm (syst) ~ ps}$, $τ$B^0 = $1.507 \pm 0.010 ({\rm stat}) \pm 0.008 {\rm (syst) ~ ps}$ and $τ$Lambda_b = $1.537 \pm 0.045 ({\rm stat}) \pm 0.014 {\rm (syst) ~ ps}$. The lifetime ratios are $τ$B^+/$τ$B^0 = $1.088 \pm 0.009 ({\rm stat})\pm 0.004 ({\rm syst})$ and $τ$Lambda_b/$τ$B^0 = $1.020 \pm 0.030 ({\rm stat})\pm 0.008 ({\rm syst})$. These are the most precise determinations of these quantities from a single experiment.

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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