Study of FCNC mediated Z boson effectin the semileptonic rare baryonic decays Λ b → Λl+l-

2005/10/13 by A. Giri, A. K. Giri, R. Mohanta +1 · 2 citations
Physics and Astronomy · #Asymmetry #Baryon #Baryon asymmetry #Boson #Branching fraction #Coupling (piping) #Lepton #Neutral current #Neutrino #Neutrino Physics Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #Quark #Semileptonic decay #Standard Model (mathematical formulation) #Vector boson #hep-ph

paper · pdf · doi:10.1140/epjc/s2005-02407-6

published as Eur.Phys.J.C45:151-158,2006 · 17 pages, 8 figures, to appear in EPJC

arxiv created 2005/10/13 · openalex publication_date 2005/10/25 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We study the effect of the FCNC mediated Z boson in the rare semileptonic baryonic decays Λ_b → Λl⁺ l^-. We consider the model where the standard model fermion sector is extended by an extra vector like down quark, as a consequence of which it allows CP violating Z mediated flavor changing neutral current at the tree level. We find that due to this non-universal Zbs coupling, branching ratios of the rare semileptonic Λ_b decays are enhanced reasonably from their corresponding standard model values and the zero point of the forward backward asymmetry for Λ_b → Λμ⁺ μ^- is shifted to the left.

Citations

• New physics effects on theCPasymmetries inB→φKSandB→η′KSdecays
• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)

Cited by

• B, D and K decays
• Analysis of Λ b → Λl + l − rare decays in a non-universal Z′ model