期刊
PHYSICAL REVIEW LETTERS
卷 115, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.222001
关键词
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资金
- National Natural Science Foundation of China [11505285, 11447031]
- Fundamental Research Funds for the Central Universities [SWU114003, XDJK2016C067]
- National Natural Science Foundation of China (DGF and NSFC) [11475188, 11261130311, CRC110]
- IHEP Innovation Grant [Y4545170Y2]
- State Key Lab for Electronics and Particle Detectors
- Open Project Program of State Key Laboratory of Theoretical Physics [Y4KF081CJ1]
Unlike the bewildering situation in the gamma gamma* -> pi form factor, a widespread view is that perturbative QCDcan decently account for the recentBABAR measurement of the gamma gamma* ->eta(c) transition formfactor. The nextto- next-to-leading-order perturbative correction to the gamma gamma* ->eta(c,b) form factor, is investigated in the nonrelativistic QCD (NRQCD) factorization framework for the first time. As a byproduct, we obtain, by far, the most precise order-alpha(2)(s) NRQCD matching coefficient for the eta(c,b) -> gamma gamma process. After including the substantial negative order-alpha(2)(s) correction, the good agreement between NRQCD prediction and the measured gamma gamma* ->eta(c) form factor is completely ruined over a wide range of momentum transfer squared. This eminent discrepancy casts some doubts on the applicability of the NRQCD approach to hard exclusive reactions involving charmonium.
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