arXiv subjects

Juhi Vardani

Publications and source records attributed to Juhi Vardani.

3 recordsLinked to original sources

arXiv2025

Violation of LGtI inequalities in the light of NO$ν$A and T2K anomaly

The recent anomaly observed in NO$ν$A and T2K experiments in standard three-flavor neutrino oscillation could potentially signal physics extending beyond the standard model (SM). For the NSI parameters that can accommodate this anomaly, we explore the violation of Leggett-Garg type inequalities (LGtI) within the context of three-flavor neutrino oscillations. Our analysis focuses on LGtI violations in scenarios involving complex NSI with $ε_{eμ}$ or $ε_{eτ}$ coupling in long baseline accelerator experiments for normal and inverted mass ordering.LGtI violation is significantly enhanced in normal ordering (NO) for $ε_{eτ}$ scenario for T2K, NO$ν$A, and DUNE experiment set-up. We find that for inverted ordering (IO), in the DUNE experimental set-up above $8.5$ GeV, the LGtI violation can be an indication of $ε_{eτ}$ new physics scenario.

hep-ph↗

arXiv2024

Model-independent analysis of new physics effects in $B\rightarrow K^*_2(1430)μ^+ μ^-$ decay

Recently, the LHCb Collaboration provided updated measurements for the lepton flavour ratios $R_K$ and $R_{K^*}$. The currently observed values align with the predictions of the standard model. In light of these recent updates, our investigation delves into the repercussions of new physics characterized by universal couplings to electrons and muons. We specifically focus on their impact on various observables within the $B\to K_2^*(1430)(\to Kπ)μ^+ μ^-$ decay. These observables include the differential branching ratio, forward-backward asymmetry ($A_{FB}$), longitudinal polarization asymmetry ($F_L$), and a set of optimized observables ($P_i$). Our findings indicate that the branching ratio of $B\to K_2^*(\to Kπ)μ^+ μ^-$ decay can be suppressed up to $25\%$ for various new physics solutions. Furthermore, all permissible new physics scenarios demonstrate finite enhancement in the muon forward-backward asymmetry $(A_{FB})$ as well as an increase in the value of the optimized angular observable $P_2$. Moreover, in the presence of new physics zero crossing points for $A_{FB}$ and $P_2$ shift towards higher $q^2$. The current data have a mild deviation from SM predictions in $P_5'$ observable in the low-$q^2$ bin. We also explored massive $Z'$ models, which can generate universal 1D new physics scenarios, characterized by $C_9^{NP}<0$, $C_9^{NP}=-C_{10}^{NP}$, and $C_9^{NP}=-C_9'$. Using additional constraints coming from $B_s-\overline{B_s}$ mixing and neutrino trident process, we find that the conclusions of the model-independent analysis remain valid.

hep-ph↗

arXiv2023

Lepton Flavor Violating $B\to K^*_2(1430)μ^{\pm}τ^{\mp}$ Decays

A number of measurements in decays induced by the semileptonic $b\to s$ and $b\to c$ transitions hint towards a possible role of new physics in both sectors. Motivated by these anomalies, we investigate the lepton flavor violating $B\to K^*_2 (1430)μ^{\pm}τ^{\mp}$ decays. We calculate the two-fold angular distribution of $B\to K^*_2\ell_1\ell_2$ decay in presence of vector, axial-vector, scalar and pseudo-scalar new physics interactions. We then compute the branching fraction and lepton forward-backward asymmetry in the framework of $U^{2/3}_1$ vector leptoquark which is a viable solution to the current $B$ anomalies. We find that the upper limits are $\mathcal{B}(B\to K^*_2μ^-τ^+)\leq 1.64\times 10^{-7}$ and $\mathcal{B}(B\to K^*_2μ^+τ^-)\leq 0.60\times 10^{-7}$ at $90\%$ C.L.

hep-ph↗