Measurement of W + γ Production in the W to Muon Decay Channel in Proton - Anti-proton Collisions at √s = 1.96-TeV
- Okayama Univ. (Japan)
The production cross section and the kinematic properties of the decay products of Wγ in the W → μv decay channel from p$$\bar{p}$$ collisions at √s = 1.96 TeV are presented. The measurement use the high pT muon data from the upgraded Collider Detector at Fermilab (CDF). The data were collected between March 2002 and September 2003. The total integrated luminosities are 192 pb-1 with the muon detector which covers the pseudorapidity region of |η| ≤ 0.6 and 175 pb-1 with the muon detector covering the region 0.6 ≤ |η| ≤ 1.0. In the Standard Model the μvγ final states occur due to Wγ → μvγ production and via muon Bremsstrahlung, W → μv → μvγ. W bosons are selected in their muon decay mode. Additionally, photons with transverse energy above 7 GeV, pseudorapidity in the central region (|η| < 1.1) and muon-photon angular separation ΔR(μ,γ) > 0.7 are selected. The author observes a total of 128 Wγ candidates, whereas the Standard Model expectation is 142.4 ± 9.5 events. The Wγ production cross section is found to be σ(p$$\bar{p}$$ → μvγ) = 16.3 ± 2.3(stat.) ± 1.8(syst.) ± 1.2(lum.) [pb]. The theoretical prediction for this cross section is σ(p$$\bar{p}$$ → lvγ) = 19.3 ± 1.4(th.) [pb]. The Standard Model predictions for several kinematic + variables are compared with data for ETγ > 7 GeV and ΔR(μ,γ) > 0.7. The measured cross section and the photon and W boson production kinematics are found to agree with the Standard Model predictions.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76CH03000
- OSTI ID:
- 15017216
- Report Number(s):
- FERMILAB-THESIS-2005-12; TRN: US0605134
- Country of Publication:
- United States
- Language:
- English
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