Anatomy and phenomenology of μ–τ lepton flavour violation in the MSSM

By A. Brignole, A. Rossi. 2004

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Abstract We perform a detailed analysis of several μ – τ lepton flavour violating (LFV) processes, namely τ → μ X ( X = γ , e + e − , μ + μ − , ρ , π , η , η ′ ), Z → μ τ and Higgs boson decays into μτ . First we present a model independent operator analysis relevant to such decays, then we explicitly compute the LFV operator coefficients [and ( g μ − 2 ) ] in a general unconstrained MSSM framework, allowing slepton mass matrices to have large μ – τ entries. We systematically study the role and the interplay of dipole and non-dipole operators, showing how the rates and the mutual correlations of those LFV decays change in different regions of the MSSM parameter space. Values of the LFV branching ratios in the experimentally interesting range 10 −9 –10 −7 can be achieved. For at least two MSSM Higgs bosons, the branching ratio of the LFV decay into μτ can reach values of order 10 −4 .

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/be291a46c97568d8dcb5ff4bc71399855d679c15

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In Nuclear and High Energy Physics

Citations in the corpus

Anatomy and phenomenology of FCNC and CPV effects in SUSY theories (2009, background): “However, these effects become relevant only if tan β = O(40−50) and if the Higgs masses are roughly one order of magnitude lighter then the slepton masses [174, 175, 176, 177, 178, 179, 180].”
Patterns of flavour violation in the presence of a fourth generation of quarks and leptons (2010, methodology): “Table 3: Comparison of various ratios of branching ratios in the LHT model [55], the MSSM without [63, 64] and with significant Higgs contributions [65, 66] and the SM4 calculated here.”