Improved determination of color-singlet nonrelativistic QCD matrix elements for S-wave charmonium - High Energy Physics - PhenomenologyReport as inadecuate




Improved determination of color-singlet nonrelativistic QCD matrix elements for S-wave charmonium - High Energy Physics - Phenomenology - Download this document for free, or read online. Document in PDF available to download.

Abstract: We present a new computation of S-wave color-singlet nonrelativistic QCDmatrix elements for the J-psi and the eta c. We compute the matrix elements ofleading order in the heavy-quark velocity v and the matrix elements of relativeorder v^2. Our computation is based on the electromagnetic decay rates of theJ-psi and the eta c and on a potential model that employs the Cornellpotential. We include relativistic corrections to the electromagnetic decayrates, resumming a class of corrections to all orders in v, and find that theysignificantly increase the values of the matrix elements of leading order in v.This increase could have important implications for theoretical predictions fora number of quarkonium decay and production processes. The values that we findfor the matrix elements of relative order v^2 are somewhat smaller than thevalues that one obtains from estimates that are based on the velocity-scalingrules of nonrelativistic QCD.



Author: Geoffrey T. Bodwin Argonne, Hee Sok Chung, Daekyoung Kang, Jungil Lee, Chaehyun Yu Korea U.

Source: https://arxiv.org/



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