Probing the R-parity violating supersymmetric effects in the exclusive $c\to d/s\ell\nu_\ell$ decays

TL;DR

This paper investigates how R-parity violating supersymmetry could influence charm quark decays, deriving new constraints from experimental data and predicting potential observable effects for future measurements.

Contribution

It provides the first-time upper limits on R-parity violating couplings in charm decays and predicts their effects on various decay observables.

Findings

New upper limits on R-parity violating couplings were obtained.

Slepton exchange could significantly affect certain decay branching ratios.

All relevant semileptonic D decay branching ratios are sensitive to squark exchange couplings.

Abstract

A lot of branching ratios of the exclusive $c \to d/s\ell\nu_\ell$ ($\ell=e,\mu$) decays have been quite accurately measured by CLEO-c, BELLE, BABAR, BES(I,II,III), ALEPH and MARKIII collaborations. We probe the R-parity violating supersymmetric effects in the exclusive $c \to d/s\ell\nu_\ell$ decays. From the latest experimental measurements, we obtain new upper limits on the relevant R-parity violating coupling parameters within the decays, and many upper limits are obtained for the first time. Using the constrained new parameter spaces, we predict the R-parity violating effects on the observables, which have not been measured or have not been well measured yet. We find that the R-parity violating effects due to slepton exchange could be large on the branching ratios of $D_{d/s}\to e\nu_e$ decays and the normalized forward-backward asymmetries of $D_{u/d}\to \pi/K \ell\nu_\ell$ as well as $D_s\to K \ell\nu_\ell$ decays, and all branching ratios of the relevant semileptonic $D$ decays are sensitive to squark exchange couplings. Our results in this work could be used to probe new physics effects in the leptonic decays as well as the semileptonic decays, and will correlate with searches for direct supersymmetric signals at LHC and BESIII.