Rare decaysBu+→π+ℓ+ℓ−,ρ+ℓ+ℓ−andBd0→ℓ+ℓ−in theR-parity violating supersymmetry

2007/11/02 by Jian-Jun Wang, Jianjun Wang, Ru-Min Wang +3 · 3 citations
Physics and Astronomy · #Neutrino Physics Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1103/physrevd.77.014017

published as Phys.Rev.D77:014017,2008 · 27 pages, 6 figures

arxiv created 2007/11/02 · openalex publication_date 2008/01/22 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We study the rare decays B_u⁺\ensuremath→\ensuremathπ⁺\ensuremathℓ⁺\ensuremathℓ^\ensuremath-, \ensuremathρ⁺\ensuremathℓ⁺\ensuremathℓ^\ensuremath- and B_d⁰\ensuremath→\ensuremathℓ⁺\ensuremathℓ^\ensuremath- (\ensuremathℓ=e, \ensuremathμ) in the R-parity violating supersymmetric standard model. From the latest upper limits of B(B_u⁺\ensuremath→\ensuremathπ⁺\ensuremathℓ⁺\ensuremathℓ^\ensuremath-) and B(B_d⁰\ensuremath→\ensuremathℓ⁺\ensuremathℓ^\ensuremath-), we have derived new upper bounds on the relevant R-parity violating couplings products, which are stronger than the existing ones. Using the constrained parameter space, we present the R-parity violating effects on the branching ratios and the forward-backward asymmetries of these decays. We find that B(B_d⁰\ensuremath→\ensuremathℓ⁺\ensuremathℓ^\ensuremath-) and B(B_u⁺\ensuremath→\ensuremathρ⁺\ensuremathℓ⁺\ensuremathℓ^\ensuremath-) could be enhanced several orders by the R-parity violating sneutrino and squark exchanges, respectively. The R-parity violating effects on the dilepton invariant mass spectra of B_u⁺\ensuremath→\ensuremathπ⁺\ensuremathℓ⁺\ensuremathℓ^\ensuremath-, \ensuremathρ⁺\ensuremathℓ⁺\ensuremathℓ^\ensuremath- and the normalized forward-backward asymmetry A_FB(B_u⁺\ensuremath→\ensuremathπ⁺\ensuremathℓ⁺\ensuremathℓ^\ensuremath-) and A_FB(B_u⁺\ensuremath→\ensuremathρ⁺\ensuremathℓ⁺\ensuremathℓ^\ensuremath-) are studied in detail. Our results could be used to probe the R-parity violating effects and will correlate with searches for the direct R-parity violating signals at the future experiments.

Cited by

• Flavor signatures of isosinglet vector-like down quark model
• Rates and asymmetries ofB→πℓ+ℓ−decays
• Predictions for B_s → K^* ℓ ℓ in non-universal Z' models

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