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University of Illinois, Urbana, Illinois 61801, USA.
Phys Rev Lett. 2007 Mar 23;98(12):122001. doi: 10.1103/PhysRevLett.98.122001. Epub 2007 Mar 19.
We report a measurement of the Lambda b0 lifetime in the exclusive decay Lambda b0-->J/psi Lambda 0 in pp collisions at square root s=1.96 TeV using an integrated luminosity of 1.0 fb-1 of data collected by the CDF II detector at the Fermilab Tevatron. Using fully reconstructed decays, we measure tau(Lambda b0)=1.593(-0.078)(+0.083)(stat)+/-0.033(syst) ps. This is the single most precise measurement of tau(Lambda b0) and is 3.2sigma higher than the current world average.
我们报告了在费米实验室万亿电子伏特加速器的CDF II探测器收集的1.0飞靶-1的积分光度下，对质心能量为√s = 1.96 TeV的质子-质子碰撞中，Λb0通过专属衰变Λb0→J/ψ Λ0的寿命进行的测量。利用完全重建的衰变，我们测量出τ(Λb0)=1.593(-0.078)(+0.083)(统计)+/-0.033(系统)皮秒。这是对τ(Λb0)最精确的单次测量，比当前世界平均值高3.2倍标准差。
