Correlation between flavor-violating decay of long-lived slepton and tau in the coannihilation scenario with the seesaw mechanism

Journal Article · Wed Jun 01 00:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.115005· OSTI ID:21502700

Kaneko, Satoru ^[1]; Saito, Hiroki; Sato, Joe ^[2]; Shimomura, Takashi ^[3]; Vives, Oscar ^[4]; Yamanaka, Masato ^[5]

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1. Juntendo University, Graduate School of Medicine, Hongo 2-1-1, Bunkyo-ku, Tokyo, 113-8421 (Japan)
2. Department of Physics, Saitama University, Shimo-Okubo, Sakura-ku, Saitama, 338-8570 (Japan)
3. Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan)
4. Departament de Fisica Teorica and IFIC, Universitat de Valencia--CSIC, E46100, Burjassot, Valencia (Spain)
5. Maskawa Institute, Kyoto Sangyo University, Kyoto 603-8555 (Japan)

We investigate flavor violating decays of the long-lived lightest slepton and the tau lepton in the coannihilation region of the minimal supersymmetric standard model with a seesaw mechanism to generate neutrino masses. We consider a situation where the mass difference between the lightest neutralino, as the lightest supersymmetric particle, and the lightest slepton, as the next-to-lightest supersymmetric particle, is smaller than the mass of tau lepton. In this situation, the lifetime of the lightest slepton is very long and it is determined by lepton flavor violating (LFV) couplings because the slepton mainly consists of the lighter stau and the flavor conserving 2-body decay is kinematically forbidden. We show that the lifetime can change many orders of magnitude by varying the Yukawa couplings entering the seesaw mechanism. We also show that the branching ratios of LFV tau decays are strongly correlated with the lightest slepton lifetime. Therefore the branching ratios of LFV tau decays can be determined or constrained by measuring the slepton lifetime at the LHC experiment.

• OSTI ID: 21502700
• Journal Information: Physical Review. D, Particles Fields, Vol. 83, Issue 11; Other Information: DOI: 10.1103/PhysRevD.83.115005; (c) 2011 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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