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Observation of Exclusive Charmonium Production and gamma gamma -> mu(+)mu(-) in p(p)over-bar Collisions at root s=1.96 TeV

Aaltonen, T; Adelman, J; Akimoto, T; Albrow, MG; Gonzalez, BA; Amerio, S; Amidei, D; ... CDF Collaboration, ; + view all (2009) Observation of Exclusive Charmonium Production and gamma gamma -> mu(+)mu(-) in p(p)over-bar Collisions at root s=1.96 TeV. Physical Review Letters , 102 (24) , Article 242001. 10.1103/PhysRevLett.102.242001. Green open access

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Abstract

In CDF we have observed the reactions p + (p) over bar -> p + X + (p) over bar, with X being a centrally produced J/psi, psi(2S), or chi(c0), and gamma gamma -> mu(+)mu(-) in p (p) over bar collisions at root s = 1.96 TeV. The event signature requires two oppositely charged central muons, and either no other particles or one additional photon detected. Exclusive vector meson production is as expected for elastic photoproduction, gamma + p -> J/psi(psi(2S)) + p, observed here for the first time in hadron-hadron collisions. We also observe exclusive chi(c0) -> J/psi + gamma. The cross sections d sigma/dy vertical bar(y=0) for J/psi, psi(2S), and chi(c0) are 3.92 +/- 0: 25(stat) +/- 0.52(syst) nb, 0.53 +/- 0.09(stat) +/- 0.10(syst) nb, and 76 +/- 10(stat) +/- 10(syst) nb, respectively, and the continuum is consistent with QED. We put an upper limit on the cross section for Odderon exchange in exclusive J/psi production.

Type: Article
Title: Observation of Exclusive Charmonium Production and gamma gamma -> mu(+)mu(-) in p(p)over-bar Collisions at root s=1.96 TeV
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.102.242001
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.102.242001
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: CHI-MESON PRODUCTION, HADRON COLLIDERS, EXCHANGE PROCESSES, DIFFRACTION, DETECTOR, POMERON, PROBE, QCD
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/132830
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