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Experimental measurements collected by the BABAR, Belle, and LHCb experimentson different observables associated with the semileptonic transition $b \to c\tau \bar{\nu}_\tau$, indicate the existence of disagreement respect with theStandard Model predictions. We analyse the charged scalar boson contributionsto these charged-current $B$ meson anomalies within the framework of two Higgsdoublet model with the most general Yukawa couplings to quarks and leptons fromthe third generation, involving left-handed and right-handed (sterile)neutrinos. We perform a phenomenological study of the Yukawa couplingsparameter space that accommodates these anomalies. We consider the most recentdata from HFLAV world-average and Belle combination, and the upper limits ${\rmBR}(B_c^- \to \tau^- \bar{\nu}_{\tau}) < 30\%$ and $10\%$. In addition, weinclude in our study the prospect measurements on $R(D^{(\ast)})$ that theBelle II experiment could achieve and explore, for the first time, the futureimplications for the corresponding charged scalar Yukawa couplings. Thisanalysis updates the existing literature and includes new importantobservables. Our results show that current experimental $b\rightarrow c \tau\bar{\nu}_\tau$ data and Belle II projection favor the interpretation of acharged scalar boson interacting with right-handed neutrinos. Furthermore, as aside analysis regarding the charged scalar boson interpretation, we revisit therelation between $R(D^\ast)$ and ${\rm BR}(B_c^- \to \tau^- \bar{\nu}_{\tau})$by investigating whether the claim that pseudoscalar new physicsinterpretations of $R(D^{\ast})$ are implausible due to the $B_c$ lifetime isstill valid, to the light of the recent data and Belle II prospects on$R(D^{\ast})$. Lastly, we reexamine addressing the $R(D^{(\ast)})$ anomalies inthe context of the 2HDM of Type II.

Analysing the charged scalar boson contribution to the charged-current $B$ meson anomalies