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

Muhammad Arslan, Ishtiaq Ahmed, Muhammad Jamil Aslam +2

The Lepton Flavor Universality ratio $R_{\tau /\mu ,e}\left(D^{(\ast )}\right)$ poses a challenge to the Standard Model (SM), as B-factory experiments, BaBar, Belle, and the LHCb show $3.31…