Search for anomalous production of events with a high energy lepton and photon at the Tevatron

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

DOI:https://doi.org/10.2172/900361· OSTI ID:900361

Loginov, Andrey Borisovich ^[1]

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1. State Scientific Center of the Russian Federation. Inst. for Theoretical and Experimental Physics, Moscow (Russian Federation)

We present results of a search for the anomalous production of events containing a high-transverse momentum charged lepton (ℓ, either e or μ) and photon (γ), accompanied by missing transverse energy (E_T), and/or additional leptons and photons, and jets (X). We use the same kinematic selection criteria as in a previous CDF search, but with a substantially larger data set, 305 pb^-1, a p$$\bar{p}$$ collision energy of 1.96 TeV, and the upgraded CDF II detector. We find 42 ℓγE_T events versus a standard model expectation of 37.3 ± 5.4 events. The level of excess observed in Run I, 16 events with an expectation of 7.6 ± 0.7 events (corresponding to a 2.7 σ effect), is not supported by the new data. In the signature of ℓℓγ + X we observe 31 events versus an expectation of 23.0 ± 2.7 events. In this sample we find no events with an extra photon or E_T and so find no events like the one eeγγ E_T event observed in Run I.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 900361
• Report Number(s): FERMILAB-THESIS--2006-48; arXiv eprint number hep-ex/0703011
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Experiment-HEP
FERMILAB COLLIDER DETECTOR
FERMILAB TEVATRON
LEPTONS
PHOTONS
PRODUCTION
STANDARD MODEL
TRANSVERSE ENERGY