Speaker
Dr
Brian Colquhoun
(University of Glasgow)
Description
Lattice NRQCD is a relatively inexpensive formalism that can be used to simulate b quarks on the lattice at their physical mass. The HPQCD collaboration has used radiatively-improved NRQCD for b quarks in bottomonium to determine the decay rate to leptons of the ground-sate Upsilon and its first radial excitation in lattice QCD. Using time moments of vector bottomonium current-current correlators, we present our determination of the b quark mass in the MS-bar scheme.
We use NRQCD b quarks and HISQ light quarks -- with masses down to their physical values -- in the semileptonic B to pi decay at zero recoil to calculate f^0(q^2_max). Our results are consistent with the soft pion theorem for this decay, which relates the meson decay constants to the form factor by f^0(q^2_max)=f_B/f_pi in the massless pion limit.
Primary author
Dr
Brian Colquhoun
(University of Glasgow)
Co-authors
Dr
Andrew Lytle
(University of Glasgow)
Prof.
Christine Davies
(University of Glasgow)
Dr
Jonna Koponen
(University of Glasgow)
Dr
Rachel Dowdall
(University of Cambridge)
