Sensitivity to the Higgs sector of supersymmetric-seesaw models in the lepton flavor violatingτ→μf0(980)decay

Abstract

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 .

SuperB Progress Report for Physics

“…Such a configuration cannot be realized in the CMSSM, but it could be realized in the so-called Non Universal Higgs Masses (NUHM) SUSY scenario. In such a framework, there are specific regions of the parameter space in which processes like τ → µη and τ → µf 1 (980), f 1 (980) → π + π − could have a branching ratio in the range 10 −9 to 10 −10 , comparable or even slightly larger than B(τ → µγ) [8,18,19].…”

Model-discriminating power of lepton flavor violatingτdecays

“…Many scenarios of physics beyond the SM predict rates for LFV processes of charged leptons within the reach of present and future experiments. Some examples are: the SM with additional right-handed heavy Majorana neutrinos or with left-handed and right-handed neutral singlets [2], supersymmetric models [3][4][5][6][7][8][9][10][11][12][13][14], left-right symmetric models [15,16], technicolor models with non-universal Z exchange [17], multi-Higgs doublet models [18][19][20][21][22][23], leptoquark models [24][25][26], models with heavy vector-like leptons [27][28][29][30], and, the Littlest Higgs model with T-parity [31,32]. It is obvious then that if LFV transitions among charged leptons are observed at some point, it will be a challenging task to disentangle all the possible NP candidates.…”

Precision tools in hadron physics for Dalitz plot studies

“…The bands in the scalar form factors are given by the uncertainty in the kaon form factor normalizations. We emphasize that both the spectral forms and the normalizations are constrained in a fully model-independent way: no assumptions on dominance by certain resonances (e.g., the ρ 0 (770) or the f 0 (980)) or their specific PoS(Confinement X)240 quark substructure need to be made, in contrast to alternative approaches [11]. Experimental upper limits on the decay τ − → µ − π + π − have been given by the Belle collaboration [12] with and without kinematical cuts to isolate certain resonances.…”