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High Energy Physics - Phenomenology

arXiv:hep-ph/0510008 (hep-ph)
[Submitted on 2 Oct 2005 (v1), last revised 16 May 2006 (this version, v3)]

Title:Efficiency and maximal CP-asymmetry of scalar triplet leptogenesis

Authors:Thomas Hambye, Martti Raidal, Alessandro Strumia
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Abstract: We study thermal leptogenesis induced by decays of a scalar SU(2)_L triplet. Despite the presence of gauge interactions, unexpected features of the Boltzmann equations make the efficiency close to maximal in most of the parameter space. We derive the maximal CP asymmetry in triplet decays, assuming that it is generated by heavier sources of neutrino masses: in this case successful leptogenesis needs a triplet heavier than 2.8 10^{10} GeV and does not further restrict its couplings, allowing detectable mu --> e gamma, tau --> mu gamma rates in the context of supersymmetric models. Triplet masses down to the TeV scale are viable in presence of extra sources of CP-violation.
Comments: 12 pages, 6 figures. Interference term added to eq. (16d), figures recomputed (the difference is almost invisible)
Subjects: High Energy Physics - Phenomenology (hep-ph)
Report number: IFUP-TH/2005-17
Cite as: arXiv:hep-ph/0510008
  (or arXiv:hep-ph/0510008v3 for this version)
  https://doi.org/10.48550/arXiv.hep-ph/0510008
Journal reference: Phys.Lett.B632:667-674,2006
Related DOI: https://doi.org/10.1016/j.physletb.2005.11.007

Submission history

From: Alessandro Strumia [view email]
[v1] Sun, 2 Oct 2005 12:07:10 UTC (165 KB)
[v2] Tue, 8 Nov 2005 18:36:39 UTC (166 KB)
[v3] Tue, 16 May 2006 15:36:35 UTC (130 KB)
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