LHCb has recently provided the first-ever branching fraction as $\mathcal{B}( \Lambda_b \to \Lambda_c \tau^- \nu_\tau) = (1.50 \pm 0.16 0.25 0.23)$, and ratio $R(\Lambda_c)$. Considering new physics effects in $b\to c\tau^-\bar{\nu}_{\tau}$ transitions, we have constrained Wilson coefficients of one operator two scenarios from available data on these decays. The two-operator scenario with scalar-pseudoscalar tensor quark current provides most plausible solution to data. Also, tested...

We investigate flavour bounds on the $\mathcal{Z}_2 \times \mathcal{Z}_5$ and \mathcal{Z}_9$ symmetries. These symmetries are a minimal non-minimal forms of \mathcal{Z}_N$ symmetry, that can provide simple set-up for Froggatt-Nielsen mechanism. The capable explaining fermionic masses mixing pattern standard model including neutrinos. parameter space flavon field derived using current quark lepton physics data future projected sensitivities effects. strongest symmetry come from $D^0 - \bar...

The flavor changing rare decay $B\to K^{*}(\to K\pi)\ell^+\ell^-$ is one of the most studied modes due to its sensitivity physics beyond standard model and several discrepancies have come light among plethora observables that are measured. In this paper we revisit analogous baryonic mode $\Lambda_{b}\rightarrow \Lambda (\to p\pi) \ell^{+}\ell^{-}$ present a complete set ten angular can be measured using mode. Our calculations done retaining finite lepton mass so signal non-universality...

The radiative decays of $b$-baryons facilitate the direct measurement photon helicity in $b\to s\gamma$ transitions thus serving as an important test physics beyond Standard Model. In this paper we analyze complete angular distribution ground state $b$-baryon ($\Lambda_{b}^{0}$ and $\Xi_{b}^{-}$) to multibody final states assuming initially polarized sample. Our sensitivity study suggests that polarization asymmetry can be extracted a good accuracy along with simultaneous initial...

Abstract Recently, the LHCb Collaboration provided updated measurements for lepton flavour ratios $$R_K$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>R</mml:mi> <mml:mi>K</mml:mi> </mml:msub> </mml:math> and $$R_{K^*}$$ <mml:msup> <mml:mo>∗</mml:mo> </mml:msup> . The currently observed values align with predictions of standard model. In light these recent updates, our investigation delves into repercussions new physics characterized by universal couplings to...

A bstract We study the four-fold angular distribution of semileptonic $$ {\Lambda}_b\to {\Lambda}_c^{+}\left(\to \Lambda {\pi}^{+}\right){\ell}^{-}{\overline{\nu}}_{\ell } <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>Λ</mml:mi> <mml:mi>b</mml:mi> </mml:msub> <mml:mo>→</mml:mo> <mml:msubsup> <mml:mi>c</mml:mi> <mml:mo>+</mml:mo> </mml:msubsup> <mml:mfenced> <mml:mrow> <mml:msup> <mml:mi>π</mml:mi> </mml:msup> </mml:mrow> </mml:mfenced> <mml:mi>ℓ</mml:mi>...

A number of measurements in decays induced by the semileptonic $b\to s$ and c$ transitions hint towards a possible role new physics both sectors. Motivated these anomalies, we investigate lepton flavor violating $B\to K^*_2 (1430)\mu^{\pm}\tau^{\mp}$ decays. We calculate two-fold angular distribution K^*_2\ell_1\ell_2$ decay presence vector, axial-vector, scalar pseudo-scalar interactions. then compute branching fraction forward-backward asymmetry framework $U^{2/3}_1$ vector leptoquark...

Based on the standard model (SM) of particle physics, we study decays ${\mathrm{\ensuremath{\Lambda}}}_{b}\ensuremath{\rightarrow}\mathrm{\ensuremath{\Lambda}}{\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}$ in light available inputs from lattice simulations and data LHCb. We fit form factors this decay mode using theoretical experimental after defining different scenarios checking for consistency. The theory include relations between heavy quark effective soft collinear at end...

We study the 4-body angular distribution for $\Lambda_b \to \Lambda_c^{+}(\to \Lambda \pi^{+})\ell^- \bar{\nu}$ decays and find out analytical expressions various asymmetric observables in Standard Model new physics scenarios compared them with literature. Using available inputs from lattice, we have predicted values uncertainties of all these Model. Considering effects $b\to c\tau^-\bar{\nu}_{\tau}$ transitions, constrained Wilson coefficients one operator two data on decays. The...

We study the 4-body angular distribution for Λ b → c + (→ π ) ℓ − ν decays and discuss various asymmetric observables in Standard Model new physics scenarios. Considering effects cτ τ transitions, we have constrained Wilson coefficients of one operator two scenarios from available data on these decays. The two-operator scenario with scalar-pseudoscalar tensor quark current provides most plausible solution to data. Also, tested sensitivities (one or scenarios) different found correlations among them.

Recently, the LHCb Collaboration provided updated measurements for lepton flavour ratios $R_K$ and $R_{K^*}$. The currently observed values align with predictions of standard model. In light these recent updates, our investigation delves into repercussions new physics characterized by universal couplings to electrons muons. We specifically focus on their impact various observables within $B\to K_2^*(1430)(\to K\pi)\mu^+ \mu^-$ decay. These include differential branching ratio,...

Quantum dynamics means studying the evolution of an initially prescribed wave function. This is analytically tractable for special wavefunctions simplest situations—free particle and simple harmonic oscillator. The purely anharmonic oscillators are virtually impossible to handle. We show here that study Ehrenfest's equation provides alternative route quantum dynamics. It does not give exact answers but clarifies some basic aspects by providing a prescription constructing equivalent oscillators.

The recent anomalies in $b\ensuremath{\rightarrow}s{\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}$ transitions could originate from some new physics beyond the Standard Model. Either to confirm or rule out this assumption, more tests of transition are needed. Polarized ${\mathrm{\ensuremath{\Lambda}}}_{b}$ decay a $\mathrm{\ensuremath{\Lambda}}$ and dilepton pair offers plethora observables that suitable discriminate In paper, we present full angular analysis polarized...

A number of measurements in decays induced by the semileptonic $b\to s$ and c$ transitions hint towards a possible role new physics both sectors. Motivated these anomalies, we investigate lepton flavor violating $B\to K^*_2 (1430)μ^{\pm}τ^{\mp}$ decays. We calculate two-fold angular distribution K^*_2\ell_1\ell_2$ decay presence vector, axial-vector, scalar pseudo-scalar interactions. then compute branching fraction forward-backward asymmetry framework $U^{2/3}_1$ vector leptoquark which is...

We investigate flavour bounds on the $\mathcal{Z}_2 \times \mathcal{Z}_5$ and \mathcal{Z}_9$ symmetries. These symmetries are a minimal non-minimal forms of \mathcal{Z}_N$ symmetry, that can provide simple set-up for Froggatt-Nielsen mechanism. The capable explaining fermionic masses mixing pattern standard model including neutrinos. parameter space flavon field derived using current quark lepton physics data future projected sensitivities effects. strongest symmetry come from $D^0 - \bar...