Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-06-05
Phys.Rev.D66:053002,2002
Physics
High Energy Physics
High Energy Physics - Phenomenology
34pp. Final version in Phys.Rev.D (refs added, minor rewording, RevTex4)
Scientific paper
10.1103/PhysRevD.66.053002
Motivated by the recent strong experimental evidence of large \nu_mu-\nu_tau neutrino mixing, we explore current bounds on the analogous mixing in the charged lepton sector. We present a general formalism for dimension-6 fermionic effective operators involving tau-mu mixing with typical Lorentz structure (\bar{mu} \Gamma tau)(\bar{q}^a \Gamma {q}^b), and discuss their relationship to the standard model gauge symmetry and the underlying flavor dynamics. We derive the low-energy constraints on the new physics scale associated with each operator, mostly from current experimental bounds on rare decay processes of tau, hadrons or heavy quarks. For operators involving at least one light quark (u,d,s), these constraints typically give a bound on the new physics scale of a few TeV or higher. Those operators with two heavy quarks turn out to be more weakly constrained at the present, giving bounds of a few hundred GeV. A few scalar and pseudo-scalar operators are free from all current experimental constraints.
Black Deirdre
Han Tao
He Hong-Jian
Sher Marc
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