English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The recent measurements of lepton flavor university (LFU) violatingobservables in semileptonic $b \to c \ell \bar{\nu} $ and $b\to s\ell^+ \ell^-$transitions by various experiments exhibit $(2-3)\sigma$ deviations from theircorresponding Standard Model (SM) predictions. These tantalizing signals hinttowards the possible role of new physics (NP) in $b \to c \tau \bar{\nu}$ and$b\to s\mu^+\mu^-$ decay channels. This in turn indicates that the same classof NP as appeared in $b \to c \tau \bar{\nu}$, might also show up in other treelevel processes involving $b \to u \tau \bar{\nu}$ transition. Since thesecharged current transitions are doubly Cabibbo suppressed, the NP contributionscould be significant enough leading to sizeable effects in some of theobservables. In this paper, we study the implications of the vector leptoquark$U_1(3,1,2/3)$, which is one of the few scenarios that can simultaneouslyexplain the LFU violation signals both in the charged-current as well asneutral-current sectors, on the semileptonic decays $B \to (\pi, \rho,\omega)\tau \bar{\nu}$ and $B_s \to (K, K^*) \tau \bar{\nu}$. In particular, wepay our attention to the branching fraction, lepton flavor non-universality(LNU) observable, forward-backward asymmetry and the polarization asymmetryparameters of these modes. We find substantial deviations in the branchingfractions as well as LNU observables of these decay modes due to the $U_1$contributions, which can be probed by the currently running experiments LHCband Belle-II.

Investigating the effect of $U_1$ vector leptoquark on $b\to u \tau\bar{\nu}$ mediated $B$ decays