CP asymmetries of B ---> phi K(S) and B ---> eta-prime K(S) in SUSY GUT Model with Non-universal Sfermion Masses
CP asymmetries of B ---> phi K(S) and B ---> eta-prime K(S) in SUSY GUT Model with Non-universal Sfermion Masses
复制标题
DOI：
10.1143/ptp.121.49
复制
发表时间：
2008-03
影响因子：
--
通讯作者：
Sung-Gi Kim;N. Maekawa;A. Matsuzaki;Kazuki Sakurai;Tadashi Yoshikawa
中科院分区：
文献类型：
--
作者：
Sung-Gi Kim;N. Maekawa;A. Matsuzaki;Kazuki Sakurai;Tadashi Yoshikawa
在超对称大统一理论中，只有SU(5)的10（Q, U^c, E^c）中包含的第三代子可以具有不同于其他子的质量，我们分析了B \to \ φ K_S和B \to \ φ K_S的CP不对称性。这种非普适性质量模型的优点之一是前两代色子质量可以很大，而左、右手两代色子都很轻，以稳定弱尺度。因此，我们研究了一个最小超对称标准模型参数区域，在该区域中，由于轻质量的停止子、胶子和希格斯子，希格斯扇区的微调被放松。在这样一个参数区域，荷子的贡献与胶子的贡献一样重要。我们发现，由于胶子和荷子贡献之间的建设性干涉，B \to \phi K_S和B \to \eta' K_S的CP不对称性可以偏离它们的标准模型预测值O（0.1）。
We analyze CP asymmetries of B \to \phi K_S and B \to \eta' K_S in a supersymmetric grand unified theory in which only the third generation sfermions contained in 10(Q, U^c, E^c) of SU(5) can have a different mass from the others. One of the advantages of this nonuniversal mass model is that the first two generation sfermion masses can be large whereas both (left and right handed) stops are light so as to stabilize the weak scale. Therefore, we studied a minimal supersymmetric standard model parameter region in which a fine tuning in Higgs sector is relaxed owing to light masses of stops, gluino and higgsinos. In such a parameter region, the chargino contribution is as important as the gluino one. We show that the CP asymmetries of B \to \phi K_S and B \to \eta' K_S can deviate from their standard model predicted values by O(0.1) because of constructive interference between gluino and chargino contributions.