研究B+对p Lambdabar gamma、p Lambdabar pi0和B0对p Lambdabar pi-
Study of B+ to p Lambdabar gamma, p Lambdabar pi0 and B0 to p Lambdabar pi-
摘要：
本文研究了B介子的无粲重子三体衰变：B ~+到p λ ~（？）γ，B ~+到p λ ~（？）π ~ 0和B ~ 0到p λ ~（？）π ~-。给出了重子-反重子系统中部分分支分数与重子-反重子质量和质子极角分布的关系。这项研究包括B+到p λ pi 0的首次观测，测量其分支分数为（3.00^{+0.61}_{-0.53} \pm 0.33）乘以10^{-6}。我们还在90%的置信水平下，对两体衰变B 0到p Sigmabar^{*-}、B 0到Δ ^0 Lambdabar、B+到p Sigmabar^{*0}和B+到Δ ^+ Lambdabar的分支分数设定了上限。这些结果是从KEKB非对称能量e+ e-对撞机上Belle探测器在Upperion（4S）共振附近收集的414 fb ^{-1}数据样本中获得的。
英文摘要：
We study the charmless baryonic three-body decays of B mesons: B+ to p Lambdabar gamma, B+ to p Lambdabar pi0 and B0 to p Lambdabar pi-. The partial branching fractions as a function of the baryon-antibaryon mass and the polar angle distributions of the proton in the baryon-antibaryon system are presented. This study includes the first observation of B+ to p Lambdabar pi0, which is measured to have a branching fraction of (3.00^{+0.61}_{-0.53}\pm 0.33) times 10^{-6}. We also set upper limits on branching fractions of the two-body decays B0 to p Sigmabar^{*-}, B0 to Delta^0 Lambdabar, B+ to p Sigmabar^{*0}, and B+ to Delta^+ Lambdabar at the 90% confidence level. These results are obtained from a 414fb^{-1} data sample collected near the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+ e- collider.
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