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Published November 1, 2007 | public
Journal Article Open

Pion leptonic decays and supersymmetry


We compute supersymmetric contributions to pion leptonic (pil2) decays in the minimal supersymmetric standard model (MSSM). When R-parity is conserved, the largest contributions to the ratio Re/µ[equivalent]Gamma[pi+-->e+nue(gamma)]/Gamma[pi+-->µ+nuµ(gamma)] arise from one-loop (V-A)[direct-product](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 Re/µ while remaining consistent with all other precision observables.

Additional Information

©2007 The American Physical Society. (Received 23 July 2007; published 29 November 2007) We would like to thank M. Wise for useful discussions. M.R.M. and S.T. are supported under U.S Department of Energy Contract No. DE-FG02-05ER41361 and NSF No. PHY-0555674. S.S. is supported under U.S. Department of Energy Contract No. DE-FG02-04ER-41298.


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