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High Energy Physics - Phenomenology

arXiv:hep-ph/0510404 (hep-ph)
[Submitted on 31 Oct 2005 (v1), last revised 21 Nov 2005 (this version, v2)]

Title:The See-Saw Mechanism, Neutrino Yukawa Couplings, LFV Decays l_i to l_j + gamma and Leptogenesis

Authors:S. T. Petcov, W. Rodejohann, T. Shindou, Y. Takanishi
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Abstract: The LFV charged lepton decays mu to e + gamma, tau to e + gamma and tau to mu + gamma and thermal leptogenesis are analysed in the MSSM with see-saw mechanism of neutrino mass generation and soft SUSY breaking with universal boundary conditions. The case of hierarchical heavy Majorana neutrino mass spectrum, M_1 << M_2 << M_3, is investigated. Leptogenesis requires M_1 > 10^9 GeV. Considering the natural range of values of the heaviest right-handed Majorana neutrino mass, M_3 > 5*10^{13} GeV, and assuming that the soft SUSY breaking universal gaugino and/or scalar masses have values in the range of few 100 GeV, we derive the combined constraints, which the existing stringent upper limit on the mu to e + gamma decay rate and the requirement of successful thermal leptogenesis impose on the neutrino Yukawa couplings, heavy Majorana neutrino masses and SUSY parameters. Results for the three possible types of light neutrino mass spectrum -- normal and inverted hierarchical and quasi-degenerate -- are obtained.
Comments: 25 pages, 9 figures; typos corrected, few clarifying comments and one figure added; version submitted for publication
Subjects: High Energy Physics - Phenomenology (hep-ph)
Report number: SISSA 78/2005/EP, IC/2005/102, TUM-HEP-606/05
Cite as: arXiv:hep-ph/0510404
  (or arXiv:hep-ph/0510404v2 for this version)
  https://doi.org/10.48550/arXiv.hep-ph/0510404
Journal reference: Nucl.Phys. B739 (2006) 208-233
Related DOI: https://doi.org/10.1016/j.nuclphysb.2006.01.034

Submission history

From: Tetsuo Shindou [view email]
[v1] Mon, 31 Oct 2005 07:50:49 UTC (351 KB)
[v2] Mon, 21 Nov 2005 17:52:51 UTC (501 KB)
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