B-quark mediated neutrinoless ${\mu }^{-}-e^{-}$ conversion in presence of R-parity violation

Abstract

We found that in supersymmetric models with R-parity non-conservation the b-quarks may appreciably contribute to exotic neutrinoless muon-electron conversion in nuclei via the triangle diagram with two external gluons. This allowed us to extract previously overlooked constraints on the third generation trilinear R-parity violating parameters significantly more stringent than those existing in the literature.

Comments: 6 pages, 1 figure