Studying Exclusive Semi-leptonic $b\to (s,d) \nu \bar{\nu}$ Decays in the MSSM without R-parity

TL;DR

This paper analyzes the effects of R-parity violating supersymmetry on various semi-leptonic b to s and d decays, deriving new bounds on couplings and predicting sensitivities for future experiments.

Contribution

It provides a comprehensive study of R-parity violating effects in thirteen semi-leptonic B decay modes and establishes new constraints on relevant couplings.

Findings

Thirteen decay modes are highly sensitive to R-parity violating couplings.

Derived stringent bounds on R-parity violating couplings based on current experimental limits.

Future experiments like Super-B will significantly improve these bounds.

Abstract

We present a complete study of R-parity violating supersymmetric effects in thirteen exclusive and inclusive semi-leptonic $b \to (s,d) \nu \bar{\nu}$ decays, including $B^+_u\to K^{(*)+}\nu\bar{\nu}$, $B^0_d\to K^{(*)0}\nu\bar{\nu}$, $B^0_s\to \phi\nu\bar{\nu}$, $B^0_d\to \pi^0(\rho^0)\nu\bar{\nu}$, $B^+_u\to \pi^+(\rho^+)\nu\bar{\nu}$, $B^0_s\to K^{(*)0}\nu\bar{\nu}$ and $B \to X_{s,d} \nu \bar{\nu}$ decay modes, and we find those thirteen modes are very sensitive to the constrained R-parity violating couplings. We derive stringent bounds on relevant R-parity violating couplings, which are based on all existent experimental upper limits of involved semi-leptonic decays. In addition, we also investigate the sensitivities of the branching ratios and di-neutrino invariant mass spectra to the survived R-parity violating coupling spaces. Since the experimental bounds would become much better soon through Super-B, we expect that future experiments will greatly strengthen our bounds.