Abulencia, A;
Adelman, J;
Affolder, T;
Akimoto, T;
Albrow, MG;
Ambrose, D;
Amerio, S;
... CDF Collaboration; + view all
(2007)
Observation of exclusive electron-positron production in hadron-hadron collisions.
Physical Review Letters
, 98
(11)
, Article 112001. 10.1103/PhysRevLett.98.112001.
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Abstract
We present the first observation of exclusive e(+)e(-) production in hadron-hadron collisions, using p (p) over bar collision data at root s=1.96 TeV taken by the run II Collider Detector at Fermilab, and corresponding to an integrated luminosity of 532 pb(-1). We require the absence of any particle signatures in the detector except for an electron and a positron candidate, each with transverse energy E-T > 5 GeV and pseudorapidity vertical bar eta vertical bar < 2. With these criteria, 16 events are observed compared to a background expectation of 1.9 +/- 0.3 events. These events are consistent in cross section and properties with the QED process p (p) over bar -> p+e(+)e(-)+(p) over bar through two-photon exchange. The measured cross section is 1.6(-0.3)(+0.5)(stat)+/- 0.3(syst) pb. This agrees with the theoretical prediction of 1.71 +/- 0.01 pb.
| Type: | Article |
|---|---|
| Title: | Observation of exclusive electron-positron production in hadron-hadron collisions |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.98.112001 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.98.112001 |
| 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: | PAIR-PRODUCTION, EP COLLISIONS, ELECTROMAGNETIC CALORIMETER, LUMINOSITY MEASUREMENT, ION COLLISIONS, LHC, HIGGS, DIFFRACTION, HERA |
| UCL classification: | UCL 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/136392 |
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