Measurement of the ratio of prompt χ <inf>c</inf> to J/ψ production in pp collisions at √s=7 TeV
- R. Aaijb(Author),
- C. Abellan Betetaac(Author),
- B. Adevaa(Author),
- M. Adinolfiah(Author),
- C. Adrovert(Author),
- A. Affoldero(Author)
- aUniversity of Santiago de Compostela,
- bNational Institute for Subatomic Physics,
- cIstituto Nazionale Di Fisica Nucleare, Frascati,
- dAlikhanov Institute for Theoretical and Experimental Physics,
- eCERN,
- fUniversité Clermont Auvergne
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Abstract
The prompt production of charmonium χ c and J/ψ states is studied in proton-proton collisions at a centre-of-mass energy of s=7 TeV at the Large Hadron Collider. The χ c and J/ψ mesons are identified through their decays χ c→J/ψγ and J/ψ→μ +μ - using 36 pb -1 of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for χ c and J/ψ, σ(χ c→J/ψγ)/σ(J/ψ), is determined as a function of the J/ψ transverse momentum in the range 2<pTJ/ψ<15 GeV/c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low pTJ/ψ region.
Publication Information
Output type
Original language
EnglishPages from-to (Number of pages)
Pages 431-440 (10 pages)Journal (Volume, Issue Number)
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics (Volume 718, Issue 2)Publication milestones
- Published- 05/12/2012
Publication status
ISSN
0370-2693External Publication IDs
- Scopus: 84869875778
- WOS: 000312687700017
