In this work we study the lepton flavor violating (LFV) semileptonic ! f 0 ð980Þ decay within the context of SUSY-Seesaw Models, where the MSSM spectrum is extended by three right-handed neutrinos and their SUSY partners, and where the seesaw mechanism is used to generate the neutrino masses. We estimate its decay rate when it proceeds via the Higgs-mediated channel ! H Ã ! f 0 ð980Þ, where H refers to the CP-even MSSM Higgs bosons h 0 and H 0 , and the lepton flavor violating H vertex is radiatively generated via SUSY loops. In order to describe the f 0 ð980Þ meson we follow the guidelines from chiral constraints. As an implication of our computation, we explore the sensitivity to the Higgs sector in this decay and compare it with other LFV tau decay channels. The confrontation of our predictions for BRð ! f 0 ð980ÞÞ with its very competitive present experimental bound leads us to extract some interesting restrictions on the most relevant model parameters, particularly, tan and m H 0 .
Journal of High Energy Physics 2011.5 (2011): 063 reproduced by permission of Scuola Internazionale Superiore di Studi Avanzati (SISSA)We present a full diagrammatic computation of the one-loop corrections from the neutrino/sneutrino sector to the renormalized neutral CP-even Higgs boson self-energies and the lightest Higgs boson mass, Mh, within the context of the so-called MSSM-seesaw scenario. This consists of the Minimal Supersymmetric Standard Model with the addition of massive right handed Majorana neutrinos and their supersymmetric partners, and where the seesaw mechanism is used for the lightest neutrino mass generation. We explore the dependence on all the parameters involved, with particular emphasis in the role played by the heavy Majorana scale. We restrict ourselves to the case of one generation of neutrinos/ sneutrinos. For the numerical part of the study, we consider a very wide range of values for all the parameters involved. We find sizeable corrections to Mh, which are negative in the region where the Majorana scale is large (1013 - 1015 GeV) and the lightest neutrino mass is within a range inspired by data (0.1-1 eV). For some regions of the MSSM-seesaw parameter space, the corrections to Mh are substantially larger than the anticipated Large Hadron Collider precisionThe work of S.H. was partially supported by CICYT (grant FPA 2007-66387) and by the Spanish Consolider-Ingenio 2010 Program under grant MultiDark CSD2009-00064. The work of M.H. and A.R.-S. was partially supported by CICYT (grants FPA2006-05423 and FPA2009-09017) and the Comunidad de Madrid project HEPHACOS, S2009/ESP-1473. A.R.-S. thanks the Spanish Ministry of Science and Education for her FPU fellowship ref. AP2006-02535. The work of S.P. was supported by a Ramón y Cajal contract from MEC (Spain) (PDRYC-2006-000930) and partially by CICYT (grants FPA2006-2315 and FPA2009-09638) and the Comunidad de Aragón project DCYT-DGA E24/2. The work is also supported in part by the European Community’s Marie-Curie Research Training Network under contract MRTN-CT-2006-035505 and also by the Spanish Consolider-Ingenio 2010 Programme CPAN (CSD2007-00042
Abstract. Here we review the main results of LFV in the semileptonic tau decays τ → µPP (PP = π + π − , π 0 π 0 , K + K − , K 0K0 ), τ → µP (P = π, η, η ′ ), and τ → µV (V = ρ, φ ) as well as in µ − e conversion in nuclei within SUSY-seesaw scenarios, and compare our predictions with the present experimental bounds 1 . FRAMEWORK FOR LFVWe work within the framework of the Minimal Supersymmetric Standard Model (MSSM) enlarged by three right handed neutrinos and their SUSY partners, where potentially observable LFV effects in the charged lepton sector are expected to occur. We further assume a seesaw mechanism for neutrino mass generation and use thethe three heavy ones. U MNS is given by the three (light) neutrino mixing angles θ 12 , θ 23 and θ 13 , and three phases, δ , φ 1 and φ 2 . With this parameterisation it is easy to accommodate the neutrino data, while leaving room for extra neutrino mixings (from the right handed sector). It further allows for large Yukawa couplings Y ν ∼ O(1) by choosing large entries in m diag N and/or θ i . Here we focus in the particular LFV proc-φ ) decays and 2) µ − e conversion in heavy nuclei. The predictions in the following are for two different constrained MSSM-seesaw scenarios, with universal and non-universal Higgs soft masses. The respective parameters (in addition to the previous neutrino sector parameters) are: 1) CMSSM-seesaw: M 0 , M 1/2 , A 0 tan β , and sign(µ), and 2) NUHM-seesaw:1 Talk given at the SUSY08 conference, Seoul, by M. Herrero.and M H 2 = M 0 (1 + δ 2 ) 1/2 . The predictions presented here for the µ − e conversion rates include the full set of SUSY one-loop contributing diagrams, mediated by γ, Z, and Higgs bosons, as well as boxes, and do not use the Leading Logarithmic (LLog) nor the mass insertion approximations. In the case of semileptonic tau decays we have not included the boxes which are clearly subdonimant. The hadronisation of quark bilinears is performed within the chiral framework, using Chiral Perturbation Theory and Resonance Chiral Theory. This is a very short summary of the works in [1] and [2] to which we refer the reader for more details. RESULTS AND DISCUSSIONHere we present the predictions for BR(τ → µPP)and CR(µ − e, Nuclei) within the previously described framework and compare them with the following experimental bounds:, CR(µ − e, Au) < 7 × 10 −13 and CR(µ − e, Ti) < 4.3 × 10 −12 .As a general result in LFV processes that can be mediated by Higgs bosons we have found that the H 0 and A 0 contributions are relevant at large tan β if the Higgs masses are light enough. It is in this aspect where the main difference between the two considered scenarios lies. Within the CMSSM, light Higgs H 0 and A 0 bosons are only possible for low M SUSY (here we take M SUSY = M 0 = M 1/2 to reduce the number of input parameters). In contrast, within the NUHM, light Higgs bosons can be
In this work we study the radiative corrections to the mass of the lightest Higgs boson of the MSSM from three generations of Majorana neutrinos and sneutrinos. The spectrum of the MSSM is augmented by three right handed neutrinos and their supersymmetric partners. A seesaw mechanism of type I is used to generate the physical neutrino masses and oscillations that we require to be in agreement with present neutrino data. We present a full one-loop computation of these Higgs mass corrections, and analyze in full detail their numerical size in terms of both the MSSM and the new (s)neutrino parameters. A critical discussion on the different possible renormalization schemes and their implications, in particular concerning decoupling, is included. * email: Sven.Heinemeyer@cern.ch †
Here we study and compare the sensitivity to the Higgs sector of the SUSY-seesaw models via the LFV tau decays: tau-> 3 mu, tau->K^{+}K^{-}, tau->mu eta and tau-> mu f_{0}. We emphasize that, at present, the two later channels are the most efficient ones to test indirectly the Higgs particles.Comment: 4 pages, 3 figures, conference SUSY09 Boston (M.Herrero
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