Phenomenology of Ξb→Ξcτν decays

Abstract

Deviations from the standard model prediction have been reported in various semileptonic B decays mediated via b → c charged-current interactions. In this context, we analyze corresponding semileptonic baryon decays Ξ b → Ξ c τν using the helicity formalism. We report numerical results on various observables such as the decay rate, ratio of branching ratios, lepton-side forward-backward asymmetry, longitudinal polarization fraction of the charged lepton, and the convexity parameter for this decay mode using results from the relativistic quark model. We also provide an estimate of the new physics effect on these observables under various new physics scenarios.

Semileptonic Decays of Heavy Baryons in the Relativistic Quark Model

“…Results of predictions for R Λ c are in good agreement, while our R p value is slightly lower than the estimate in Ref. [17]. Please note that lattice determination of form factors is done in the region of small recoils of the final baryon q 2 ∼ q 2 max and then their values are extrapolated to the whole kinematical region, which is broad especially for the heavy-to-light Λ b → plν l decay.…”

“…Our predictions for these ratios are given in Table 2 in comparison with calculations [17] based on lattice values of weak decay form factors [21]. Results of predictions for R Λ c are in good agreement, while our R p value is slightly lower than the estimate in Ref.…”

“…The semileptonic differential decay rates of the Λ b baryon are plotted in Figure 3. In Table 1 we compare our predictions in the framework of the relativistic quark model (RQM) for the total semileptonic decay rates of bottom baryons with the results of other theoretical approaches [12][13][14][15][16][17][18][19][20][21] and available experimental data from Particle Data Group (PDG) [22]. The most comprehensive results for different decay parameters were previously obtained in the covariant confined quark model (CCQM) [12][13][14][15], with which we find the general agreement.…”

“…[16], while effective Lagrangian approach (ELA) with form factors calculated on the lattice [21] is employed in Ref. [17]. The authors of Refs.…”

Implication of RD(*) anomalies on semileptonic decays of Σb and Rajeev1, Dutta2, Kumbhakar3 2019Phys. Rev. DSelf Cite15080View full textAdd to dashboardCite

“…where λ 2 and λ W are the respective helicities of the daughter baryon and the off-shell W boson. In the rest frame of parent baryon B 1 , the helicity amplitudes can be written as [72,73] H V…”