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Neutrino mass, sneutrino dark matter and signals of lepton flavor violation in the MRSSM

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Abstract

We study the phenomenology of mixed-sneutrino dark matter in the Minimal R-symmetric Supersymmetric Standard Model (MRSSM). Mixed sneutrinos fit naturally within the MRSSM, as the smallness (or absence) of neutrino Yukawa couplings singles out sneutrino A-terms as the only ones not automatically forbidden by R-symmetry. We perform a study of randomly generated sneutrino mass matrices and find that (i) the measured value of Ω DM is well within the range of typical values obtained for the relic abundance of the lightest sneutrino, (ii) with small lepton-number-violating mass terms m nn 2 ññ for the right-handed sneutrinos, random matrices satisfying the Ω DM constraint have a decent probability of satisfying direct detection constraints, and much of the remaining parameter space will be probed by upcoming experiments, (iii) the m nn 2 ññ terms radiatively generate appropriately small Majorana neutrino masses, with neutrino oscillation data favoring a mostly sterile lightest sneutrino with a dominantly μ/τ-flavored active component, and (iv) a sneutrino LSP with a significant μ component can lead to striking signals of e-μ flavor violation in dilepton invariant-mass distributions at the LHC.

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Authors and Affiliations

  1. Center for Cosmology and Particle Physics, Department of Physics, New York University, New York, NY, 10003, U.S.A.

    Abhishek Kumar & Neal Weiner

  2. Department of Physics, Williams College, Williamstown, MA, 01267, U.S.A.

    David Tucker-Smith

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  1. Abhishek Kumar
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  2. David Tucker-Smith
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Correspondence to Abhishek Kumar.

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ArXiv ePrint: 0910.2475

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Kumar, A., Tucker-Smith, D. & Weiner, N. Neutrino mass, sneutrino dark matter and signals of lepton flavor violation in the MRSSM. J. High Energ. Phys. 2010, 111 (2010). https://doi.org/10.1007/JHEP09(2010)111

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