B 0 s -B 0 s mixing and the B s →J/ψφ asymmetry in supersymmetric models
B 0 s -B 0 s mixing and the B s →J/ψφ asymmetry in supersymmetric models
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DOI：
10.1103/physrevd.69.115011
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发表时间：
2003-11
影响因子：
5
通讯作者：
P. Ball;S. Khalil;E. Kou
中科院分区：
文献类型：
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作者：
P. Ball;S. Khalil;E. Kou
利用质量插入近似，分析了超对称对B_S混合的贡献及其对混合引起的CP不对称的影响。我们特别讨论了B_S->；J/psi；Phi和B_d->；K_S的CP不对称性中的超对称效应的关联，发现在B_S混合和B_d->；PhI K_S中占主导地位的质量插入分别是(Delta_{23}^d)_{LL，RR}和(Delta_{23}^d)_{LR，RL}。结果表明，具有优势的(δ_(23)^d)_{LR，RL}的模型可以容纳负值S_{Phi K_S}，这与观测到的Belle测量结果一致，但产生的B_S混合相太小而无法观察到。另一方面，(Delta_(23)^d)_{Ll，Rr}占优势的模型预测了对Delta M_S和混合相都有相当大的超对称贡献，但不允许B_d>；Phi K_S的不对称性变为负值，除了平均下夸克质量的小值，这反过来又意味着DeltaM_S的值太大，以至于在Tevatron和LHC都观察不到。我们的结论是，在强子机上观测到B_S混合，再加上确认S_{PhI K_S}为负值，不利于具有单一主导质量插入的模型。评论：17页，5位数字
We analyse supersymmetric contributions to B_s mixing and their impact on mixing-induced CP asymmetries, using the mass insertion approximation. We discuss in particular the correlation of SUSY effects in the CP asymmetries of B_s -> J/psi phi and B_d -> phi K_S and find that the mass insertions dominant in B_s mixing and B_d -> phi K_S are (delta_{23}^d)_{LL, RR} and (delta_{23}^d)_{LR, RL}, respectively. We show that models with dominant (delta_{23}^d)_{LR, RL} can accomodate a negative value of S_{phi K_S}, in agreement with the BELLE measurement of that observable, but yield a B_s mixing phase too small to be observed. On the other hand, models with dominant (delta_{23}^d)_{LL, RR} predict sizeable SUSY contributions to both Delta M_s and the mixing phase, but do not allow the asymmetry in B_d -> phi K_S to become negative, except for small values of the average down squark mass, which, in turn, entail a value of Delta M_s too large to be observed at the Tevatron and the LHC. We conclude that the observation of B_s mixing at hadron machines, together with the confirmation of a negative value of S_{phi K_S}, disfavours models with a single dominant mass insertion. Comment: 17 pages, 5 figures