We compute the J/ψ → charmed mesons cross section using QCD sum rules. This cross section is important to distinguish the suppression in the production of J/ψ through the dissociation by comoving pions and through the formation of quarkgluon plasma. Our sum rules for the J/ψ π → D̄ D*, D D̄*, D̄* D* and D̄ D hadronic matrix elements are constructed by using vacuum-pion correlation functions, and we work up to twist-4. After doing a thermal average we get (σπJ/ψ v) ∼ 0.2-0.4 mb at T = 150 MeV.
|Number of pages||7|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2003 Jun 3|
Bibliographical noteFunding Information:
We are grateful to J. Hüfner and H. Kim for fruitful discussions. M.N. would like to thank the hospitality and financial support from the Yonsei University during her stay in Korea. This work was supported by CNPq and FAPESP-Brazil.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics