b-quark mediated neutrinoless μ−–e− conversion in presence of R-parity violation

We found that in supersymmetric models with R-parity non-conservation (R/pSUSY) the b-quarks may appreciably contribute to exotic neutrinoless μ−–e−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/p parameters significantly more stringent than those existing in the literature.