期刊
PHYSICS LETTERS B
卷 701, 期 1, 页码 101-106出版社
ELSEVIER
DOI: 10.1016/j.physletb.2011.05.042
关键词
Non-perturbative methods; Exotic-charmonium states; QCD sum rules
资金
- FAPESP
- CNPq, Brazil
- National Natural Science Foundation of China [11035006, 11047606]
- Ministry of Education of China (FANEDD) [200924]
- Ministry of Education of China (DPFIHE) [20090211120029]
- Ministry of Education of China (NCET) [NCET-10-0442]
- Fundamental Research Funds for the Central Universities
Using the QCD sum rules we test if the charmonium-like structure Y(4274), observed in the J/psi phi invariant mass spectrum, can be described with a D-s(D) over bar (s0)(2317)+ h.c. molecular current with J(PC) = 0(-+). We consider the contributions of condensates up to dimension ten and we work at leading order in alpha(s). We keep terms which are linear in the strange quark mass m(s). The mass obtained for such state is mD(s)D(s0) = (4.78 +/- 0.54) GeV. We also consider a molecular 0(-+) D (D) over bar (0)(2400)+ h.c. current and we obtain m(DD0) = (4.55 +/- 0.49) GeV. Our study shows that the newly observed Y(4274) in the J/psi phi invariant mass spectrum can be, considering the uncertainties, described using a molecular charmonium current. (C) 2011 Elsevier B.V. All rights reserved.
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