ηcProduction at the LHC Challenges Nonrelativistic QCD Factorization
Copyright policy )ηcProduction at the LHC Challenges Nonrelativistic QCD Factorization
We analyze the first measurement of $��_c$ production, performed by the LHCb Collaboration, in the nonrelativistic-QCD (NRQCD) factorization framework at next-to-leading order (NLO) in the strong-coupling constant $��_s$ and the relative velocity $v$ of the bound quarks including the feeddown from $h_c$ mesons. Converting the long-distance matrix elements (LDMEs) extracted by various groups from $J/��$ yield and polarization data to the $��_c$ 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.
5 pages, 2 figures, minor changes, note regarding arXiv:1411.7350 [hep-ph] added, accepted for publication in Physical Review Letters
- Universität Hamburg Germany
- Deutsches Elektronen-Synchrotron DESY Germany
- Helmholtz Association of German Research Centres Germany
velocity, nonrelativistic [quantum chromodynamics], FOS: Physical sciences, meson, spin [heavy quark], High Energy Physics - Experiment, quark, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), strong interaction: coupling constant, factorization, strong coupling, symmetry [spin], polarization, info:eu-repo/classification/ddc/550, quantum chromodynamics: nonrelativistic, higher-order: 1, singlet [color], LHC-B, spin: symmetry, High Energy Physics - Phenomenology, CERN LHC Coll, color: singlet, eta/c(2980), coupling constant [strong interaction], 1 [higher-order], heavy quark: spin, ddc: ddc:550
velocity, nonrelativistic [quantum chromodynamics], FOS: Physical sciences, meson, spin [heavy quark], High Energy Physics - Experiment, quark, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), strong interaction: coupling constant, factorization, strong coupling, symmetry [spin], polarization, info:eu-repo/classification/ddc/550, quantum chromodynamics: nonrelativistic, higher-order: 1, singlet [color], LHC-B, spin: symmetry, High Energy Physics - Phenomenology, CERN LHC Coll, color: singlet, eta/c(2980), coupling constant [strong interaction], 1 [higher-order], heavy quark: spin, ddc: ddc:550
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