منابع مشابه
Moving NRQCD
Many of the most interesting experimental probes of the Standard Model involve exclusive weak decays of B mesons. Because the B is much heavier than charmed and strange mesons, these decay products have large recoil momenta. This presents a problem for lattice calculations of these processes, since (naively) the spatial lattice spacing must be fine enough to control discretization errors of ord...
متن کاملMoving NRQCD for B Form Factors at High Recoil
We derive the continuum and lattice tree-level moving NRQCD (mNRQCD) through order 1/m. mNRQCD is a generalization of NRQCD for dealing with hadrons with nonzero velocity uμ. The quark’s total momentum is written as P = Mu + k where k ≪ Mu is discretized and Mu is treated exactly. Radiative corrections to couplings on the lattice are discussed. mNRQCD is particularly useful for calculating B → ...
متن کاملNRQCD Factorization and Universality of NRQCD Matrix Elements
The approach of nonrelativistic QCD(NRQCD) factorization was proposed to study inclusive production of a quarkonium. It is widely used and successful. However, a recent study of gluon fragmentation into a quarkonium at two-loop level shows that the factorization is broken. It is suggested that the color-octet NRQCD matrix elements should be modified by adding a gauge link to restore the factori...
متن کاملThe heavy quark’s self energy from moving NRQCD on the lattice
The study of semi-leptonic B decays is currently of great interest as it provides us with a test of the Standard Model. A key process is that of B → π semi-leptonic decay, however, because the B meson is much heavier than the final states, the recoil momenta of the π meson can be large. This leads to both problems of small signal to noise ratios and significant discretisation errors if apπ is l...
متن کاملNRQCD: A Critical Review
In this talk I review some recent applications of NRQCD. I first discuss the unquenched NRQCD lattice extractions of the strong coupling constant, paying particular attention to the recent advances in reducing systematic errors. I then discuss the progress made in testing the NRQCD/factorization formalism for onium production. In particular, I gather the evidence, or lack thereof, for the unive...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 1998
ISSN: 0920-5632
DOI: 10.1016/s0920-5632(97)00771-8