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000209177 0881_ $$aDESY-14-219; arXiv:1411.5287
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000209177 1001_ $$0P:(DE-H253)PIP1005899$$aButenschoen, Mathias$$b0
000209177 245__ $$a$\eta_c$ production at the LHC challenges nonrelativistic-QCD factorization
000209177 260__ $$aCollege Park, Md.$$bAPS$$c2015
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000209177 520__ $$aWe analyze the first measurement of ${\eta }_{c}$ production, performed by the LHCb Collaboration, in the nonrelativistic QCD (NRQCD) factorization framework at next-to-leading order (NLO) in the strong-coupling constant ${\alpha }_{s}$ and the relative velocity $v$ of the bound quarks including the feeddown from ${h}_{c}$ mesons. Converting the long-distance matrix elements extracted by various groups from $J/\psi $ yield and polarization data to the ${\eta }_{c}$ case using heavy-quark spin symmetry, we find that the resulting NLO NRQCD predictions greatly overshoot the LHCb data, while the color-singlet model provides an excellent description.
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000209177 650_7 $$2INSPIRE$$aquantum chromodynamics: nonrelativistic
000209177 650_7 $$2INSPIRE$$aeta/c(2980)
000209177 650_7 $$2INSPIRE$$aheavy quark: spin
000209177 650_7 $$2INSPIRE$$aspin: symmetry
000209177 650_7 $$2INSPIRE$$astrong interaction: coupling constant
000209177 650_7 $$2INSPIRE$$ahigher-order: 1
000209177 650_7 $$2INSPIRE$$afactorization
000209177 650_7 $$2INSPIRE$$aLHC-B
000209177 650_7 $$2INSPIRE$$acolor: singlet
000209177 650_7 $$2INSPIRE$$astrong coupling
000209177 650_7 $$2INSPIRE$$aCERN LHC Coll
000209177 650_7 $$2INSPIRE$$apolarization
000209177 650_7 $$2INSPIRE$$avelocity
000209177 650_7 $$2INSPIRE$$aquark
000209177 650_7 $$2INSPIRE$$ameson
000209177 693__ $$0EXP:(DE-MLZ)NOSPEC-20140101$$5EXP:(DE-MLZ)NOSPEC-20140101$$eNo specific instrument$$x0
000209177 7001_ $$0P:(DE-H253)PIP1016434$$aHe, Zhiguo$$b1
000209177 7001_ $$0P:(DE-H253)PIP1004103$$aKniehl, Bernd A.$$b2$$eCorresponding author
000209177 773__ $$0PERI:(DE-600)1472655-5$$a10.1103/PhysRevLett.114.092004$$gVol. 114, no. 9, p. 092004$$n9$$p092004$$tPhysical review letters$$v114$$x1079-7114$$y2015
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