Dronely

Flavor at low and high $p_T$

“…with = e, µ , are well understood theoretically, since most of the hadronic (form factor) uncertainties cancel or can be reduced using lattice QCD inputs and/or heavy quark effective theory calculations [19]. On the other hand, the measured values of these ratios exhibit a combined tension of about O(3σ ) with respect to the theoretical predictions within the SM, indicating an almost universal O(20%) upward deviation [20,21].…”