PoS - Proceedings of Science
Volume 256 - 34th annual International Symposium on Lattice Field Theory (LATTICE2016) - Weak Decay and Matrix Elements
$B_c$ decays from highly improved staggered quarks and NRQCD
A. Lytle,* B. Colquhoun, C. Davies, J. Koponen, C. McNeile on behalf of HPQCD Collaboration
*corresponding author
Full text: pdf
Pre-published on: December 27, 2016
Published on: March 24, 2017
We calculate semileptonic form factors for the decays $B_c \to \eta_c \, l \nu$ and $B_c \to J/\psi \, l \nu$ over the entire $q^2$ range, using a highly improved lattice quark action for charm at several lattice spacings down to $a=0.045~$fm.
We have two ways of treating the $b$ quark: either with an $\cal O(\alpha_s)$ 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 $B \to D$ and $B \to D^*$.
DOI: https://doi.org/10.22323/1.256.0281
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.