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F, Vint P, Vokac P, Von Toerne E, Voutilainen M, Vreeswijk M, Wagner R, Wahl H D, Wang L, Wang M H L S, Warchol J, Watts G, Wayne M, Weber M, Weber G, Weerts H, Wenger A, Wermes N, Wetstein M, White A, Wicke D, Wilson G W, Wimpenny S J, Wobisch M, Wood D R, Wyatt T R, Xie Y, Yacoob S, Yamada R, Yan M, Yasuda T, Yatsunenko Y A, Yip K, Yoo H D, Youn S W, Yu J, Yu C, Yurkewicz A, Zatserklyaniy A, Zeitnitz C, Zhang D, Zhao T, Zhou B, Zhu J, Zielinski M, Zieminska D, Zieminski A, Zivkovic L, Zutshi V, Zverev E G
Joint Institute for Nuclear Research, Dubna, Russia.
Phys Rev Lett. 2007 Nov 2;99(18):182001. doi: 10.1103/PhysRevLett.99.182001. Epub 2007 Oct 30.
We report a measurement of the Lambda(b)(0) lifetime using a sample corresponding to 1.3 fb(-1) of data collected by the D0 experiment in 2002-2006 during run II of the Fermilab Tevatron collider. The Lambda(b)(0) baryon is reconstructed via the decay Lambda(b)(0)-->micronuLambda(c)(+)X. Using 4437+/-329 signal candidates, we measure the Lambda(b)(0) lifetime to be tau(Lambda(b)(0))=1.290(-0.110)(+0.119)(stat)(-0.091)(+0.087)(syst) ps, which is among the most precise measurements in semileptonic Lambda(b)(0) decays. This result is in good agreement with the world average value.
我们报告了使用对应于费米实验室Tevatron对撞机运行II期间（2002 - 2006年）D0实验收集的1.3 fb⁻¹数据样本对Λ(b)(0)寿命的测量结果。Λ(b)(0)重子通过衰变Λ(b)(0)→μνΛ(c)(+)X进行重建。利用4437±329个信号候选事例，我们测量出Λ(b)(0)寿命为τ(Λ(b)(0)) = 1.290（-0.110）（+0.119）（统计）（-0.091）（+0.087）（系统）皮秒，这是半轻子Λ(b)(0)衰变中最精确的测量结果之一。该结果与世界平均值吻合良好。
