High Energy Physics Journal Club
High-Precision f_{Bs} and HQET from Relativistic Lattice QCD
by Nilmani Mathur
Friday, October 28, 2011
from
to
(Asia/Kolkata)
at Colaba Campus ( A-304 )
at Colaba Campus ( A-304 )
Description |
C. McNeile, C. T. H. Davies, E. Follana, K. Hornbostel, G. P. Lepage We present a new determination of the $B_s$ leptonic decay constant from lattice QCD simulations that use gluon configurations from MILC and a highly improved discretization of the relativistic quark action for both valence quarks. Our result, $f_{B_s} = 0.225(4)$\,GeV, is almost three times more accurate than previous determinations. We analyze the dependence of the decay constant on the heavy quark's mass and obtain the first empirical evidence for the leading $1/\sqrt{m_h}$ dependence predicted by Heavy Quark Effective Theory (HQET). As a check, we use our analysis technique to calculate the $m_{B_s}-m_{\eta_b}/2$ mass difference. Our result agrees with experiment to within errors of $11\,\mathrm{MeV}$ (better than 2%). We discuss how to extend our analysis to other quantities in $B_s$ and $B$ physics, making 2%-precision possible for the first time. |
Participants | Arka Banerjee; Debasish Banerjee; Raju Bathija; Rajeev Bhalerao; Biplob Bhattacharjee; Sudhansu Biswal; Saumen Datta; Amol Dighe; Rajiv V. Gavai; Diptimoy Ghosh; Monoranjan Guchait; Sourendu Gupta; Vinod Joshi; Sridhar K.; Nikhil Karthik; Padmanath M.; Nilmani Mathur; Shiraz Minwalla; Subroto Pal; Sreerup Raychaudhuri; Sayantan Sarma; Anurag Tripathi |
Material: |