Improving previous calculations, we compute the J/ψπ→ charmed meson cross section using QCD sum rules. Our sum rules for the J/ ψπ→ D̄D*, DD̄*, D̄*D*, and D̄D hadronic matrix elements are constructed by using vacuum-pion correlation functions, and we work up to twist-4 in the soft-pion limit. Our results suggest that using meson exchange models is perfectly acceptable, provided that they include form factors and that they respect chiral symmetry. After evaluating a thermal average we get 〈 σ πJ/ψv〉∼0.3 mb at T = 150 MeV.
|Number of pages||3168731|
|Journal||Physical Review C - Nuclear Physics|
|Publication status||Published - 2003 Sep 1|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics