Report/Journal Article

PUBDB-2015-02008

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png $\eta_c$ production at the LHC challenges nonrelativistic-QCD factorization

Butenschoen, M.>Extern* ; He, Z.>Extern* ; Kniehl, B. A. (Corresponding author)DESY*

2015
APS College Park, Md.

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Please use a persistent id in citations: doi:10.1103/PhysRevLett.114.092004

Report No.: DESY-14-219; arXiv:1411.5287

Abstract: We 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.

Keyword(s): quantum chromodynamics: nonrelativistic ; eta/c(2980) ; heavy quark: spin ; spin: symmetry ; strong interaction: coupling constant ; higher-order: 1 ; factorization ; LHC-B ; color: singlet ; strong coupling ; CERN LHC Coll ; polarization ; velocity ; quark ; meson

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Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF3-611) (POF3-611)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2015

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Database coverage:
; ; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 5 ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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