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Power counting and effective field theory for charmonium
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We hypothesize that the correct power counting for charmonia is in the parameter Lambda_QCD/m_c, but is not based purely on dimensional analysis (as is HQET). This power counting leads to predictions which differ from those resulting from the usual velocity power counting rules of NRQCD. In particular, we show that while Lambda_QCD/m_c power counting preserves the empirically verified predictions of spin symmetry in decays, it also leads to new predictions which include: A hierarchy between spin singlet and triplet octet matrix elements in the J/psi system. A quenching of the net polarization in production at large transverse momentum. No end point enhancement in radiative decays. We discuss explicit tests which can differentiate between the traditional and new theories of NRQCD.
Forward citations
Cited by 2 Pith papers
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Factorizing quarkonium production matrix elements using effective field theory
Factorizes NRQCD production matrix elements for S- and P-wave quarkonia into wavefunctions and universal chromo-electric/magnetic gluon correlators via hybrid vNRQCD/pNRQCD and Hubbard-Stratonovich transformation at l...
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Lattice QCD study of the $\chi_{c1}\to J/\psi \, \gamma$ decay
A first-principles lattice QCD calculation gives Gamma(chi_c1 to J/psi gamma) = 0.3265(79) MeV and a2 = -0.0666(22), consistent with experiment and far more precise than prior lattice results.
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