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arXiv 0812.1167hep-ph
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CDF多μ子事件和MSSM的单态扩展

CDF Multi-Muon Events and Singlet Extensions of the MSSM

Florian Domingo, Ulrich Ellwanger

摘要:

我们讨论了标准模型的最小超对称扩展的推广,以三个额外的单重超场的形式,这将解释最近提出的CDF多μ子事件的基本特征:~ 100 pb的大的产生截面源自具有70 - 80 GeV范围内的质量和~ 40的大的tan(β)值的CP奇标量A的产生。CP奇标量A主要衰变为CP奇标量a_1和CP偶标量h_1,它们产生级联衰变h_1 -> 2h_2-> 4a_2-> 8 τ轻子和a_1 -> h_1a_2,其中h_1的衰变过程与上述过程相同。衰变a_2 -> τ + τ-慢,寿命为O(20)ps。该模型的现象学与之前提出的类似场景不同,因为两个级联中的一个导致10个而不是8个τ轻子,并且其他生产过程,如关联A生产与b b棒对是相关的。

英文摘要:

We discuss a generalization of the minimal supersymmetric extension of the Standard Model in the form of three additional singlet superfields, which would explain the essential features of the CDF multi-muon events presented recently: a large production cross section of ~ 100 pb originates from the production of a CP-odd scalar A with a mass in the 70 - 80 GeV range and a large value of tan(beta) ~ 40. The CP-odd scalar A decays dominantly into CP-odd and CP-even scalars a_1 and h_1, which generate decay cascades h_1 -> 2 h_2 -> 4 a_2 -> 8 tau-leptons, and a_1 -> h_1 a_2 with h_1 decaying as above. The decay a_2 -> tau+ tau- is slow, leading to a lifetime of O(20) ps. The phenomenology of the model differs from similar scenarios presented before in that one of the two cascades leads to 10 instead of 8 tau-leptons, and additional production processes like associate A production with b b-bar pairs are relevant.

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