Abstract
We present a lattice study of electromagnetic decays of vector mesons V into pseudoscalar mesons P, relevant to radiative decays V→Pγ and conversion decays V→Pℓ +ℓ -. The form factor ƒ q (q 2) , associated with the electromagnetic current of the quark q, has been computed using Wilson fermions in the quenched approximation. The computations have been performed by averaging the results over 15 gauge configurations, generated by the Metropolis algorithm, at β=6.0, on a 20×10 2×40 lattice. By extrapolating linearly the form factor to q 2 =0, we have obtained ƒ u (0)=2.2±0.3 GeV −1 for a massless quark and ƒ s (0)=1.8±0.2 GeV −1 for a strange quark, in remarkable agreement with the experimental values, ƒ u (0)+2.32±0.08 GeV −1 and ƒ s (0)= 1.84±0.06 GeV −1 . A larger value of ƒ u (0) is obtained from the vector meson dominance model. We have also estimated the partial widths for the conversion decays using both a linear dependence on q 2 of the form factor and the vector meson dominance predictions.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.