Charged Lepton Flavour Violation and (g-2)(mu) in the Littlest Higgs Model with T-Parity: A Clear Distinction from Supersymmetry

By M. Blanke, Andrzej Buras, Bjoern Duling, A. Poschenrieder, C. Tarantino. 2007

169 citations recorded by the source corpus.

We calculate the rates for the charged lepton flavour violating decays l_i -> l_j gamma, tau -> l pi, tau -> l eta, tau -> l eta', mu^- -> e^- e^+ e^-, the six three body leptonic decays tau^- -> l_i^- l_j^+ l_k^- and the rate for mu-e conversion in nuclei in the Littlest Higgs model with T-Parity (LHT). We also calculate the rates for K_{L,S} -> mu e, K_{L,S} -> pi^0 mu e and B_{d,s} -> l_i l_j. We find that the relative effects of mirror leptons in these transitions are by many orders of magnitude larger than analogous mirror quark effects in rare K and B decays analyzed recently. In particular, in order to suppress the mu -> e gamma and mu^- -> e^- e^+ e^- decay rates and the mu-e conversion rate below the experimental upper bounds, the relevant mixing matrix in the mirror lepton sector V_Hl must be rather hierarchical, unless the spectrum of mirror leptons is quasi-degenerate. We find that the pattern of the LFV branching ratios in the LHT model differs significantly from the one encountered in the MSSM, allowing in a transparent manner to distinguish these two models with the help of LFV processes. We also calculate (g-2)_mu and find the new contributions to a_mu below 10^{-10} and consequently negligible. We compare our results with those present in the literature.

Subfields: Artificial Intelligence, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/02c4013631b77436f8072862c779c4a9b24e2b81

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Artificial Intelligence

In Nuclear and High Energy Physics

Citations in the corpus

Research Proposal for an Experiment to Search for the Decay $\mu \to eee$ (2013, background): “02− 1 have been predicted [53, 54, 88, 89], or in Left-Right Symmetric models with additional Higgs triplets.”
Anatomy and phenomenology of FCNC and CPV effects in SUSY theories (2009, methodology): “This would provide a powerful tool to discriminate between different NP scenarios as, for instance, SUSY and LHT models, as the latter do not predict a dipole dominance for `i → `j`k`k [73].”
Patterns of flavour violation in the presence of a fourth generation of quarks and leptons (2010, methodology): “It is therefore sucient to consider the formulae for the (partially) integrated branching ratios, which can be directly obtained from the corresponding expressions in [ 4 ] by appropriately replacing the loop functions by those of the SM4.”