Exclusive interactions in p$$\bar{p}$$ collisions at √s = 1.96 TeV

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 2006

DOI:https://doi.org/10.2172/892299· OSTI ID:892299

Hamilton, Andrew ^[1]

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1. Univ. of Alberta, Edmonton, AB (Canada)

This thesis presents two exclusive production processes in p$$\bar{p}$$ collisions at √s = 1.96 TeV, using the Collider Detector Facility at Fermi National Accelerator Laboratory. An observation of exclusive e⁺e^- production through γγ → e⁺e^- is presented, as well as evidence for exclusive production of γγ through gg → γγ (via a quark loop). The exclusive e⁺e^- production observation is based on 16 candidate events, with a background estimate of 2.1$$+0.7\atop{-0.3}$$. Each event has an e⁺e^- pair (E_T (e) > 5 GeV, |η(e)| < 2) and nothing else observable in the CDF detector. The measured cross section is 1.6$$+0.5\atop{-0.3}$$(stat) ± 0.3(sys) pb, while the predicted cross section is 1.711 ± 0.008 pb. The kinematic properties of the events are consistent with the predictions of the LPAIR Monte Carlo. The evidence for exclusive γγ production consists of 3 candidate events, with a background estimate of 0.0$$+0.2\atop{-0.0}$$ events. Each event has two photons (E_Tγ) > 5 GeV, |η(γ)| < 1 and nothing else observable in the CDF detector. The measured cross section for these events is 0.14$$+0.14\atop{-0.04}$$(stat) ± (sys) pb. It agrees with the theoretical prediction of 0.04 pb with a factor 3 to 5 theoretical uncertainty.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76CH03000
• OSTI ID: 892299
• Report Number(s): FERMILAB-THESIS--2006-10
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CROSS SECTIONS
EXCLUSIVE INTERACTIONS
Experiment-HEP
FERMILAB ACCELERATOR
FERMILAB COLLIDER DETECTOR
FORECASTING
PHOTONS
PRODUCTION
QUARKS