Jul 24 – 30, 2016
Highfield Campus, University of Southampton
Europe/London timezone

B_c decays from highly improved staggered quarks and NRQCD

Jul 27, 2016, 9:40 AM
Building B2a Room 2065 (Highfield Campus, University of Southampton)

Building B2a Room 2065

Highfield Campus, University of Southampton

Talk Weak Decays and Matrix Elements Weak Decays and Matrix Elements


Dr Andrew Lytle (University of Glasgow)


We use both non-relativistic QCD (NRQCD) and fully relativistic formalisms to calculate semileptonic form factors for the decays B_c -> eta_c lv and B_c -> J/psi lv over the entire q^2 range. To achieve this we employ a highly improved lattice quark action at several lattice spacings down to a=.044 fm, which allows a fully relativistic treatment of charm and simulation of the full q^2 range with controlled continuum extrapolation. We have two ways of treating the b quark: either with an O(alpha_s) improved NRQCD formalism or by extrapolating a heavy mass m_h to m_b in the relativistic formalism. Comparison of the two approaches provides an important cross-check of methodologies in lattice QCD. Nonperturbative renormalisation of the currents in the relativistic theory also allows us then to fix NRQCD-charm normalisation for b to c decays such as B -> D and B -> D^*.

Primary author

Dr Andrew Lytle (University of Glasgow)


Dr Brian Colquhoun (University of Glasgow) Prof. Christine Davies (University of Glasgow) Dr Craig McNeile (Plymouth University) Dr Jonna Koponen (University of Glasgow)

Presentation materials