Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-04-30
Phys.Rev.D76:095017,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 11 figures; included additional electroweak constraints in analysis, simplified abstract, ref. added
Scientific paper
10.1103/PhysRevD.76.095017
We compute supersymmetric contributions to pion leptonic (\pi_{l2}) decays in the Minimal Supersymmetric Standard Model (MSSM). When R-parity is conserved, the largest contributions to the ratio R_{e/\mu} = \Gamma[ \pi^+ \to e^+ \nu_e(\gamma)]/\Gamma[ \pi^+ \to \mu^+ \nu_\mu(\gamma)] arise from one-loop (V-A)x(V-A) corrections. These contributions can be potentially as large as the sensitivities of upcoming experiments; if measured, they would imply significant bounds on the chargino and slepton sectors complementary to current collider limits. We also analyze R-parity violating interactions, which may produce a detectable deviation in R_{e/\mu} while remaining consistent with all other precision observables.
Ramsey-Musolf Michael
Su Shufang
Tulin Sean
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