R-parity violating enhancement of Bu+→ℓ +ν and Bc+→ℓ +ν

Abstract

We study the decays B + u →ℓ + ν and B + c →ℓ + ν in the context of the Minimal Supersymmetric Standard Model (MSSM) with explicit R-parity violation. We analyse the correlation between the two decays and show that branching ratios (BRs) for B + c →ℓ + ν may be of order 5% (over 40% in one case), without violating current bounds on B + u →ℓ + ν. Although B c mesons are inaccessible at the e + e − B factories, such large BRs for B + c →ℓ + ν would possibly be within experimental observability at LEP and the Tevatron Run II, with much larger yields expected at the hadronic B factories. We also update some earlier bounds on products of R-parity violating couplings in the light of new experimental results.