We present a pilot study on extracting the P-wave form factors of the $ B_s $ to $ D_s $ semi-leptonic decays from the $B_s$ four-point correlators. With their inclusive nature, four-point correlators include all the exclusive states from $B_s$ with valence content of $c$ and $s$ quarks. We access the excited-state contributions by carefully fitting the correlators using multiple exponentials....
Semileptonic $B_{(s)}$ decays are of great phenomenological interest because they allow to extract CKM matrix elements or test lepton flavor universality. Taking advantage of existing data, we explore extracting form factors for vector final states using the narrow width approximation. Based on RBC-UKQCD's set of 2+1 flavor gauge field ensembles with Shamir domain-wall fermion and Iwasaki...
