Search for exclusive $\gamma \gamma$ production in hadron-hadron collisions - INSPIRE

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Search for exclusive $\gamma \gamma$ production in hadron-hadron collisions

CDF

Collaboration

Jul, 2007

7 pages

Published in:

Phys.Rev.Lett. 99 (2007) 242002

e-Print:

0707.2374 [hep-ex]

DOI:

10.1103/PhysRevLett.99.242002

Report number:

FERMILAB-PUB-07-384-E

Experiments:

FNAL-E-0830

View in:

reference search118 citations

Citations per year

Abstract: (arXiv)

We have searched for exclusive 2-photon production in proton-antiproton collisions at sqrt{s} = 1.96 TeV, using 532/pb 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, pi0-pi0, or eta-eta production. The probability that other processes fluctuate to 3 events or more is 1.7x10^-4. An upper limit on the cross section of p+pbar --> p+gamma-gamma+pbar is set at 410 fb with 95% confidence level.

Note:

7 pages, 2 figures. Submitted to Phys.Rev.Lett

13.85.Rm
14.80.Bn
13.85.Qk
anti-p p: colliding beams
anti-p p: exclusive reaction
photon: pair production
Feynman graph: higher-order
gluon gluon: fusion
particle identification: efficiency
background

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Figures(3)

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