1993/11/26 by K. C. Bowler, UKQCD Collaboration, N. M. Hazel +8 · 26 citations
Physics and Astronomy · #Combinatorics #Crystallography #High-Energy Particle Collisions Research #Lattice (music) #Lattice QCD #Lepton #Nuclear physics #Order (exchange) #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quark #Semileptonic decay #hep-lat #hep-ph
paper · pdf · doi:10.1103/physrevlett.72.1398
published in Physical Review Letters 72(10), 1398-1401 (American Physical Society) · 12 pages, LaTeX article with 4 epsf-included postscript figures, (uuencoded compressed tarfile). Minor change in form factor definitions (for posterity), to standardize on convention of Bernard et al
arxiv created 1993/11/26 · openalex publication_date 1994/03/07 · arxiv updated 2015/06/25 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We calculate the leading-order matrix element for the decay B\ensuremath→K*\ensuremathγ in the quenched approximation of lattice QCD on a 243\ifmmode×\else\texttimes\fi48 lattice at \ensuremathβ=6.2, using an O(a)-improved fermion action. Extrapolating to physical quark masses gives an on-shell form factor of T1(q2=0)=0.15_\mathrm\ensuremath-14+12 (stat). We find T1 is approximately independent of the spectator quark mass and extract T1(q2=0)=0.15_\mathrm\ensuremath-4+5 if this independence is assumed. We find the results to be consistent (in the standard model) with the CLEO experimental branching ratio of B(B\ensuremath→K*\ensuremathγ)=(4.5\ifmmode±\else\textpm\fi1.5\ifmmode±\else\textpm\fi0.9)\ifmmode×\else\texttimes\fi10^\mathrm\ensuremath-5.