arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0809.2526hep-ex
收藏

在sqrt(s)~10.87 GeV的e+e湮没中衰变B_s^0-> D_s^- pi^+的测量和B_s^0 -> D_s^{+/-} K^{-/+}的证据

Measurement of the Decay B_s^0 -> D_s^- pi^+ and Evidence for B_s^0 -> D_s^{+/-} K^{-/+} in e+e- Annihilation at sqrt(s)~10.87 GeV

The Belle Collaboration, R. Louvot, J. Wicht, O. Schneider

摘要:

我们利用KEKB e ~+对撞机上Belle探测器在Upperion(5S)共振条件下收集的23.6 /fb的数据,研究了Bs ~ 0-> Ds ~ π ~+和Bs ~ 0-> Ds ~^(-/+)K ~^(+/-)衰变。将此高纯度的Bs 0-> Ds- pi+样品用于测量支化分数,BR(Bs 0-> Ds- pi+)=[3.67 + 0.35,-0.33}(stat.)+0.43,-0.42(系统)+-0.49(f_s)] × 10^{-3}(f_s=N(Bs(*)Bs(*)bar)/N(b \bar b)),以及在地震(5S)能量处的Bs 0事件类型的分数,{特别是N(Bs* Bs*bar)}/N(N(Bs(*)Bs(*)bar)=(90.1 +3.8,-4.0 +-0.2)%。我们还确定了质量M(Bs 0)=(5364.4 +-1.3 +-0.7)MeV/c^2和M(Bs*)=(5416.4 +-0.4 +-0.5)MeV/c^2。此外,我们还观察到了Bs 0-> Ds^(-/+)K^(+/-)的显著性为3.5σ的衰变,并测量了BR(Bs 0-> Ds^(-/+)K^(+/-))=[2.4 +1.2,-1.0(stat.)+-0.3(系统)+-0.3(f_s)] × 10^{-4}。

英文摘要:

We have studied Bs0 -> Ds- pi+ and Bs0 -> Ds^(-/+) K^(+/-) decays using 23.6 /fb of data collected at the Upsilon(5S) resonance with the Belle detector at the KEKB e+e- collider. This highly pure Bs0 -> Ds- pi+ sample is used to measure the branching fraction, BR(Bs0 -> Ds- pi+)=[3.67 +0.35,-0.33}(stat.) +0.43,-0.42(syst.) +-0.49(f_s)] x 10^{-3} (f_s=N(Bs(*) Bs(*)bar)/N(b\bar b)) and the fractions of Bs0 event types at the Upsilon(5S) energy, {in particular N(Bs* Bs*bar}/N(N(Bs(*) Bs(*)bar)=(90.1 +3.8,-4.0 +-0.2)%. We also determine the masses M(Bs0)=(5364.4 +-1.3 +-0.7) MeV/c^2 and M(Bs*)=(5416.4 +-0.4 +-0.5) MeV/c^2. In addition, we observe Bs0 -> Ds^(-/+) K^(+/-) decays with a significance of 3.5σand measure BR(Bs0 -> Ds^(-/+) K^(+/-))=[2.4 +1.2,-1.0(stat.) +-0.3(syst.) +-0.3(f_s)] x 10^{-4}.

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。

↑