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Photo-production of psi(2S) mesons at HERA

Abstract:

Quasi-elastic (z > 0.95) photo-production of ψ(2S) mesons has been observed at HERA for photon-proton centre-of-mass energies in the range 40 to 160 GeV. The ψ(2S) mesons were identified through their decays to ℓ+ℓ- and to J/ψπ+π-, where the J/ψ subsequently decays to ℓ+ℓ-, the lepton ℓ being either a muon or an electron. The cross-section for quasi-elastic photoproduction was measured to be (18.0 ± 2.8(stat) ± 3.0(syst)) nb at a photon-proton centre-of-mass energy of 80 GeV. The ratio of ...

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Publication status:
Published

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Journal:
PHYSICS LETTERS B
Volume:
421
Issue:
1-4
Pages:
385-394
Publication date:
1998-03-05
DOI:
ISSN:
0370-2693
URN:
uuid:f314dae5-1c7e-4e08-a13c-29b7f842fd3d
Source identifiers:
25601
Local pid:
pubs:25601
Language:
English

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