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T: Fachverband Teilchenphysik

T 85: Beyond the Standard Model (Theory) 2 and QFT and Lattice Gauge Theory 1

T 85.9: Talk

Thursday, March 24, 2022, 18:15–18:30, T-H16

Decay constants of B, B_s, and B_c mesons — •Matthew Black and Oliver Witzel — Physik Department, Universität Siegen, Walter-Flex-Str. 3, Siegen, Germany

We present the status of our ongoing work extracting B-meson decay constants f_B with B = B₀,B⁺,B_s,B_c. Our calculation is based on N_f = 2+1 dynamical flavour gauge field ensembles generated by the RBC/UKQCD collaborations using domain wall fermions and the Iwasaki gauge action. Using domain wall light, strange, and charm quarks and relativistic b-quarks we obtain results at three different lattice spacings a ≈ 0.11,0.08,0.07 fm and multiple valence quark masses. We perform a global fit to obtain phenomenologically relevant results in the continuum and at physical quark masses.