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Search for exclusive gamma gamma production in Hadron-Hadron collisions

Aaltonen, T; Abulencia, A; Adelman, J; Affolder, T; Akimoto, T; Albrow, MG; Amerio, S; ... Zucchelli, S; + view all (2007) Search for exclusive gamma gamma production in Hadron-Hadron collisions. Physical Review Letters , 99 (24) , Article 242002. 10.1103/PhysRevLett.99.242002. Green open access

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Abstract

We have searched for exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 TeV, using 532 pb(-1) of integrated luminosity taken by the run II Collider Detector at Fermilab. The event signature requires two electromagnetic showers, each with transverse energy E-T > 5 GeV and pseudorapidity |eta| < 1.0, with no other particles detected in the event. Three candidate events are observed. We discuss the consistency of the three events with gamma gamma, pi(0)pi(0), or eta eta production. The probability that other processes fluctuate to >= 3 events is 1.7x10(-4). An upper limit on the cross section of p (p) over bar -> p + gamma gamma + (p) over bar production is set at 410 fb with 95% confidence level.

Type: Article
Title: Search for exclusive gamma gamma production in Hadron-Hadron collisions
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.99.242002
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.99.242002
Language: English
Additional information: © 2007 The American Physical Society
Keywords: MASSLESS PARTICLES, CALORIMETER, DETECTOR
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/136422
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