BSM 𝑩 − 𝑩¯ mixing on JLQCD and RBC/UKQCD 𝑵 𝒇 = 2 + 1 DWF ensembles

We are presenting our ongoing Lattice QCD study on 𝐵 − 𝐵¯ mixing on several RBC/UKQCD and JLQCD ensembles with 2+1 dynamical-flavour domain-wall fermions, including physical-pionmass ensembles. We are extracting bag parameters 𝐵𝐵𝑑 and 𝐵𝐵𝑠 using the full 5-mixing-operator basis to study both Standard-Model mixing as well as Beyond the Standard Model mixing, using a fully correlated combined fit to two-point functions and ratios of three-point and two-point functions. Using 15 different lattice ensembles we are simulating a range of heavy-quark masses from below the charm-quark mass to just below the bottom-quark mass.