Model independent analysis of $$ B^* \rightarrow P \ell {\bar{\nu }}_\ell $$ B∗→Pℓν¯ℓ decay processes

• Main Authors: Atasi Ray, Suchismita Sahoo, Rukmani Mohanta
• Format: Article
• Language: English
• Published: SpringerOpen 2019-08-01
• Series: European Physical Journal C: Particles and Fields
• Online Access: http://link.springer.com/article/10.1140/epjc/s10052-019-7183-8
• ISSN: 1434-6044; 1434-6052

Abstract Very compelling deviations in the recently observed lepton nonuniversality observables $$ (R_{D^{(*)}}, R_{K^{(*)}}, R_{J/\psi } )$$ (RD(∗),RK(∗),RJ/ψ) of semileptonic B meson decays from their Standard Model predictions hint towards the presence of some kind of new physics beyond it. In this regard, we investigate the effect of new physics in the semileptonic $${\bar{B}}_{d(s)}^* \rightarrow P \ell {\bar{\nu }}_\ell $$ B¯d(s)∗→Pℓν¯ℓ decay processes, where $$P=D,\pi (D_s,K$$ P=D,π(Ds,K ), in a model independent way. We consider the presence of additional vector and scalar type interactions and constrain the corresponding new couplings by fitting $$\mathrm{Br(B_{u}^+ \rightarrow \tau ^+ \nu _\tau )}$$ Br(Bu+→τ+ντ) , $${\mathrm{\mathrm Br}(B \rightarrow \pi \tau {{\bar{\nu }}}_\tau )}$$ Br(B→πτν¯τ) , $$\mathrm{Br(B_{c}^+ \rightarrow \tau ^+ \nu _\tau )}$$ Br(Bc+→τ+ντ) , $$R_\pi ^l$$ Rπl , $$R_{D^{(*)}}$$ RD(∗) and $$R_{J/\psi }$$ RJ/ψ data. Using the constrained new parameters, we estimate the branching ratios, forward–backward asymmetry, lepton-spin asymmetry and lepton non-universality observables of $${\bar{B}}_{d,s}^{*} \rightarrow P \tau {{\bar{\nu }}}_\tau $$ B¯d,s∗→Pτν¯τ processes. We find that the branching ratios of these decay modes are sizeable and deviate significantly (for vector-type couplings) from their corresponding standard model values, which are expected to be within the reach of Run III of Large Hadron Collider experiment.