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M, Wormser G, Wotton S A, Wright S, Wu S, Wyllie K, Xie Y, Xing Z, Xu Z, Yang Z, Yuan X, Yushchenko O, Zangoli M, Zavertyaev M, Zhang L, Zhang W C, Zhang Y, Zhelezov A, Zhokhov A, Zhong L, Zvyagin A
Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands.
Universidad de Santiago de Compostela, Santiago de Compostela, Spain.
Phys Rev Lett. 2014 Oct 3;113(14):141801. doi: 10.1103/PhysRevLett.113.141801. Epub 2014 Sep 29.
Three-body B+ → ppK+ and B(+) → ppπ(+) decays are studied using a data sample corresponding to an integrated luminosity of 3.0 fb(-1) collected by the LHCb experiment in proton-proton collisions at center-of-mass energies of 7 and 8 TeV. Evidence of CP violation in the B(+) → ppK(+) decay is found in regions of the phase space, representing the first measurement of this kind for a final state containing baryons. Measurements of the forward-backward asymmetry of the light meson in the pp rest frame yield A(FB)(ppK(+),m(pp)<2.85 GeV/c(2)) = 0.495 ± 0.012 (stat) ± 0.007 (syst) and A(FB)(ppπ(+),m(pp) <2.85 GeV/c(2)) = -0.409 ± 0.033 (stat) ± 0.006 (syst). In addition, the branching fraction of the decay B(+) → Λ(1520)p is measured to be B(B(+) → Λ(1520)p) = (3.15 ± 0.48 (stat) ± 0.07 (syst) ± 0.26 (BF)) × 10(-7), where BF denotes the uncertainty on secondary branching fractions.
利用大型强子对撞机底夸克（LHCb）实验在质心能量为7和8 TeV的质子-质子碰撞中收集的对应于3.0 fb⁻¹积分亮度的数据样本，研究三体B⁺→ppK⁺和B⁺→ppπ⁺衰变。在相空间区域发现了B⁺→ppK⁺衰变中CP破坏的证据，这是对包含重子的末态进行的此类首次测量。在pp静止参考系中对轻介子的前后不对称性测量得到A(FB)(ppK⁺,m(pp)<2.85 GeV/c²) = 0.495±0.012（统计）±0.007（系统）和A(FB)(ppπ⁺,m(pp)<2.85 GeV/c²) = -0.409±0.033（统计）±0.006（系统）。此外，测得衰变B⁺→Λ(1520)p的分支比为B(B⁺→Λ(1520)p) = (3.15±0.48（统计）±0.07（系统）±0.26（分支分数）)×10⁻⁷，其中分支分数表示二级分支分数的不确定性。
