Computer Science
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006slft.confe..98v&link_type=abstract
Proceedings of the XXIVth International Symposium on Lattice Field Theory. July 23-28, 2006, Tucson, Arizona., p.98.1
Computer Science
Scientific paper
We construct the S-wave part of the electromagnetic vector annihilation current to O(αs v2 ), where v is the non-relativistic quark velocity, for heavy quarks whose dynamics are described by the ¯ NRQCD action on the lattice. The NRQCD vector current for QQ annihilation is expressed as a linear combination of lattice operators with quantum numbers L = 0, J P = 1- , and the coefficients are determined by matching to the corresponding continuum current in QCD to O(v2 ) at one- loop. The annihilation channel gives a complex amplitude with Coulomb-exchange and infrared singularities, making a careful choice for the contours of integration and infrared subtraction functions in the numerical integration necessary. An automated vertex generation program written in Python is employed, allowing us to use a realistic NRQCD action and an improved gluon lattice action; a change in the definition of either action is easily accommodated in this procedure. The final result is applicable to simulations of electromagnetic decays of heavy quarkonia, notably the ϒ meson.
No associations
LandOfFree
Leptonic widths of heavy quarkonia: QCD/NRQCD matching for the electromagnetic current at O(alpha_s v^2) does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Leptonic widths of heavy quarkonia: QCD/NRQCD matching for the electromagnetic current at O(alpha_s v^2), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Leptonic widths of heavy quarkonia: QCD/NRQCD matching for the electromagnetic current at O(alpha_s v^2) will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-920479