Discriminating electroweak-ino parameter ordering at the LHC and its impact on LFV studies

作者：Hisano Junji^*; Nojiri Mihoko M; Sreethawong Warintorn

来源：The Journal of High Energy Physics, 2009, 2009(6): 044.

DOI：10.1088/1126-6708/2009/06/044

• Supersymmetry Phenomenology

Current limit on the dark matter relic abundance may suggest that vertical bar mu vertical bar should be smaller than prediction in the minimal supergravity scenario (mSUGRA) for moderate m(0) and m(1/2). The electroweak-ino parameter M-1, M-2 and vertical bar mu vertical bar are then much closer to each other. This can be realized naturally in the non-universal Higgs mass model (NUHM). Since the heaviest neutralino ((chi) over tilde (0)(4)) and chargino ((chi) over tilde ( /-)(2)) have significant gaugino components, they may appear frequently in the left-handed squark decay and then be detectable at the LHC. In such a case, we showed that the hierarchy of M-1, M-2 and vertical bar mu vertical bar can be determined. In the light slepton mass scenario with non-vanishing lepton-flavor violation (LFV) in the right-handed sector, NUHM with small vertical bar mu vertical bar corresponds to region of parameter space where strong cancellation among leading contributions to Br(mu -> e gamma) can occur. We showed that determination of electroweak-ino hierarchy plays a crucial role in resolving cancellation point of Br(mu -> e gamma) and determination of LFV parameters. We also discussed test of the universality of the slepton masses at the LHC and the implications to SUSY flavor models.

• 出版日期2009-6