Enhancement of the lepton flavor violating Higgs boson decay rates from SUSY loops in the inverse seesaw model

Abstract

Reprinted with permission from the American Physical Society: Arganda, E., Herrero, M.J., Marcano, X. Weiland, C. (2016). Enhancement of the lepton avor violating Higgs boson decay rates from SUSY loops in the inverse seesaw model. Physical Review D 93(5): 055010 c (2017) by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. In this article, we study the full one-loop SUSY contributions to the lepton flavor violating Higgs decay h → τμ, within the context of the supersymmetric inverse seesaw model. We assume that both the righthanded neutrino masses, M R , and their supersymmetric partner masses, m~ν R , are not far from the interesting OðTeVÞ energy scale, and we work with scenarios with large neutrino Yukawa couplings that transmit large lepton flavor violating effects. By exploring the behavior with the most relevant parameters, mainly M R , m~ν R and the trilinear sneutrino coupling A ν , we will look for regions of the parameter space where the enhancement of BRðh → τμÞ is large enough to reach values at the percent level, which could explain the excess recently reported by CMS and ATLAS at the CERN Large Hadron Collider.

Analysis of the h, H, A → τμ decays induced from SUSY loops within the Mass Insertion Approximation

“…Several examples where the neutrino Yukawa couplings, which can be large if neutrinos are Majorana fermions, are the responsible for generating these LFVHD have been explored in the literature. The issue of LFVHD being radiatively generated from loops with neutrinos was first explored in a non-SUSY context [48], and later other cases were considered, including the case of the type-I seesaw model both with and without SUSY [37], the inverse seesaw model [13] and its SUSY version [47]. The study of LFVHD within the more general context of Non-Minimal-Flavor Violation (NMFV) of the MSSM has also a long story.…”

“…On the theoretical side, the subject of LFVHD has been studied for a long time in the literature within various models beyond the SM (for recent works see, for instance, ), but the most frequently explored ones are the supersymmetric (SUSY) models because the needed feature of flavor mixing among particles of different generations to produce these exotic decays is easily incorporated and well justified in the SUSY particles sector [32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47]. More specifically, it is the flavor mixing among the three generations of the charged sleptons and/or sneutrinos, typically present in SUSY models, what produces via their contributions at the one-loop level, these interesting Higgs decay channels with Lepton Flavor Violation (LFV).…”

Search for lepton flavour violating decays of the Higgs boson to μτ and eτ in proton-proton collisions at $$ \sqrt{s}=13 $$ TeV

“…These decays are forbidden in the SM but occur in many new physics scenarios. These include supersymmetric [5][6][7][8][9][10][11][12][13], composite Higgs [14,15], or Randall-Sundrum models [16][17][18], SM extensions with more than one Higgs boson doublet [19,20] or with flavour symmetries [21], and many other scenarios [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. The presence of LFV Higgs boson couplings would allow τ → µ and τ → e to proceed via a virtual Higgs boson [37,38].…”

Lepton Flavor Violating Higgs Boson Decays in Supersymmetric High Scale Seesaw Models

“…We can conclude that we may need additional sources of lepton flavor violation (other then already present in the high scale see-saw models) to explain a CMS-type excess for the channel BR(h → µτ ). Other neutrino motivated SUSY scenarios such as the inverse see-saw models can enhance lepton flavor violating Higgs boson decay rates [81,82]. However, the latest results from CMS, if confirmed, will impose severe constraints on these models.…”