Probing New Physics in light of recent developments in $b\to c\ell \nu$ transitions

Abstract

The experimental studies of the observables associated with the $b\to c$ transitions in the semileptonic $B-$ meson decays at BaBar, Belle and LHCb have shown some deviations from the Standard Model (SM) predictions, consequently, providing a handy tool to probe the possible new physics (NP). In this context, we have first revisited the impact of recent measurements of $R(D^{(\ast )})$ and $R({\Lambda }_c)$ on the parametric space of the NP scenarios. In addition, we have included the $R(J/\psi )$ data in the analysis and found that their influence on the best-fit points and the parametric space is mild. Using the recent HFLAV data, after validating the well established sum rule of $R({\Lambda }_c)$, we derived the similar sum rule for $R(J/\psi )$. Furthermore, according to the updated data, we have modified the correlation among the different observables, giving us their interesting interdependence. Finally, to discriminate the various NP scenarios, we have plotted the different angular observables and their ratios for $B\to D^{\ast }\tau {\nu }_{\tau }$ against the transfer momentum square $\left(q^2\right)$, using the $1\sigma$ and $2\sigma$ parametric space of considered NP scenarios. By implementing the collider bounds on NP Wilson coefficients, we find that, in the parametric space of some NP WCs is significantly restrained. To see the clear influence of NP on the amplitude of the angular observables, we have also calculated their numerical values in different $q^2$ bins and shown them through the bar plots. We hope their precise measurements will help to discriminate various NP scenarios.

33 pages, 9 figures, 8 Tables, Final version accepted in PTEP

References in corpus (23)

• Test of lepton universality using $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays
• B-physics anomalies: a guide to combined explanations
• On the B to D* tau nu Sensitivity to New Physics
• Measurement of the branching ratio of ${\bar{B}}^0\to D^{\ast +}{\tau }^{-}{\bar{\nu }}_{\tau }$ relative to ${\bar{B}}^0\to D^{\ast +}{\ell }^{-}{\bar{\nu }}_{\ell }$ decays with a semileptonic tagging method
• Gauge leptoquark as the origin of B-physics anomalies
• The lifetime of the $B_c^{-}$ meson and the anomalies in $B\to D^{(\ast )}\tau \nu$
• Baryon Number and Lepton Universality Violation in Leptoquark and Diquark Models
• New physics in the weak interaction of $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$
• Measurement of the $\tau$ lepton polarization and $R(D^{\ast })$ in the decay $\bar{B}\to D^{\ast }{\tau }^{-}{\bar{\nu }}_{\tau }$ with one-prong hadronic $\tau$ decays at Belle
• B-decay Anomalies in a Composite Leptoquark Model
• Renormalization-group evolution of new physics contributions to (semi)leptonic meson decays
• Simultaneous Explanation of the $R_K$ and $R_{D^{(\ast )}}$ Puzzles: a Model Analysis
• Leptoquark Flavor Patterns & B Decay Anomalies
• B -> D tau nu Branching Ratios: Opportunity for Lattice QCD and Hadron Colliders
• Constraint on the branching ratio of B_c \to tau nu from LEP1 and consequences for R(D(*)) anomaly
• New Physics in the Visible Final States of $B\to D^{(\ast )}\tau \nu$
• Observation of the decay ${\Lambda }_b^0\to {\Lambda }_c^{+}{\tau }^{-}{\overline{\nu }}_{\tau }$
• Tension in the inclusive versus exclusive determinations of $|V_{cb}|$: a possible role of new physics
• Lepton flavor universality violation in semileptonic tree level weak transitions
• Non-resonant new physics search at the LHC for the $b\to c\tau \nu$ anomalies
• A comprehensive study on the semileptonic decay of heavy flavor mesons
• Relativistic description of the semileptonic decays of bottom mesons
• Anomalies in Weak Decays of Hadrons Containing a b Quark

Cited by in corpus (6)

• Global fit to $b\to c\tau \nu$ anomalies as of Spring 2024
• On sum rules for semi-leptonic $b\to c$ and $b\to u$ decays
• Addressing the $R_{\tau /\mu ,e}\left(D^{(\ast )}\right)$ puzzle through New Physics four-fermion operators and their impact on ${\Lambda }_b\to {\Lambda }_c\tau {\bar{\nu }}_{\tau }$ decay
• Chirality structure of vector like new physics operators in charged current transitions
• The Angular Observables of ${\Lambda }_b\to {\Lambda }_c(\to {\Lambda }^0{\pi }^{+}){\tau }^{-}(\to {\pi }^{-}{\nu }_{\tau }){\bar{\nu }}_{\tau }$ within the Paradigm of FCCC Anomalies
• The effects of polarization on the observables in the decay ${\Xi }_{cc}^{++}\to {\Xi }_c^{+}\bar{\ell }{\nu }_{\ell }$