Collider signals from slow decays in supersymmetric models with an intermediate-scale solution to the μ problem -: art. no. 095008

被引:33
作者
Martin, SP [1 ]
机构
[1] No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA
[2] Fermi Natl Accelerator Lab, Batavia, IL 60510 USA
来源
PHYSICAL REVIEW D | 2000年 / 62卷 / 09期
关键词
D O I
10.1103/PhysRevD.62.095008
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The problem of the origin of the mu parameter in the minimal supersymmetric standard model can be solved by introducing singlet supermultiplets with non-renormalizable couplings to the ordinary Higgs supermultiplets. The Peccei-Quinn symmetry is broken at a scale which is the geometric mean between the weak scale and the Planck scale, yielding a mu term of the right order of magnitude and an invisible axion. These models also predict one or more singlet fermions which have electroweak-scale masses and suppressed couplings to MSSM states. I consider the case that such a singlet fermion, containing the axino as an admixture, is the lightest supersymmetric particle. I work out the relevant couplings in several of the simplest models of this type, and compute the partial decay widths of the next-to-lightest supersymmetric particle involving leptons or jets. Although these decays will have an average proper decay length which is most likely much larger than a typical collider detector, they can occasionally occur within the detector, providing a striking signal. With a large sample of supersymmetric events, there will be an opportunity to observe these decays, and so gain direct information about physics at very high energy scales.
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页码:1 / 12
页数:12
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