Studying Double Charm Decays of B_{u,d} and B_{s} Mesons in the MSSM with R-parity Violation

TL;DR

This paper investigates how R-parity violating supersymmetry could influence double charm B meson decays, constraining parameters with current data and exploring potential effects on CP asymmetries, aiding future experimental searches.

Contribution

It derives bounds on R-parity violating couplings from experimental data and analyzes their impact on CP asymmetries in B meson decays, highlighting potential large effects on mixing-induced asymmetries.

Findings

R-parity violating effects could be very large on mixing-induced CP asymmetries.

Effects on direct CP asymmetries are insufficient to explain Belle's large observed CP violation.

Constraints on R-parity violating couplings are consistent with current measurements.

Abstract

Motivated by the possible large direct CP asymmetry of \bar{B}^0_d \to D^+ D^- decay measured by Belle collaboration, we investigate double charm B_{u,d} and B_s decays in the minimal supersymmetric standard model with R-parity violation. We derive the bounds on relevant R-parity violating couplings from the current experimental data, which show quite consistent measurements among relative collaborations. Using the constrained parameter spaces, we explore R-parity violating effects on other observables in these decays, which have not been measured or have not been well measured yet. We find that the R-parity violating effects on the mixing-induced CP asymmetries of \bar{B}^0_d \to D^{(*)+} D^{(*)-} and \bar{B}^0_s \to D^{(*)+}_s D^{(*)-}_s decays could be very large, nevertheless the R-parity violating effects on the direct CP asymmetries could not be large enough to explain the large direct CP violation of \bar{B}^0_d \to D^{+} D^{-} from Belle. Our results could be used to probe R-parity violating effects and will correlate with searches for direct R-parity violating signals in future experiments.