Hadronic Production of Ψ(2S) Cross section and Polarization

Thesis/Dissertation · Thu May 01 04:00:00 EDT 2008

DOI:https://doi.org/10.2172/945432· OSTI ID:945432

Chung, Kwangzoo ^[1]

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1. Carnegie Mellon Univ., Pittsburgh, PA (United States)

The hadronic production cross section and the polarization of Ψ(2S) meson are measured by using the data from p$$\bar{p}$$ collisions at √s = 1.96 TeV collected by the Collider Detector at Fermilab. The datasets used correspond to integrated luminosity of 1.1 fb^-1 and 800 pb^-1, respectively. The decay Ψ(2S) → μ⁺μ^- is used to reconstruct Ψ(2S) mesons in the rapidity range |y(Ψ(2S))| < 0.6. The coverage of the p_T range is 2.0 GeV/c ≤ p_T (Ψ(2S)) < 30 GeV/c for the cross section analysis and pT ≥ 5 GeV/c for the polarization analysis. For events with p_T (Ψ(2S)) > 2 GeV/c the integrated inclusive cross section multiplied by the branching ratio for dimuon decay is 3.17 ± 0.04 ± 0.28 nb . This result agrees with the CDF Run I measurement considering the increased center-of-mass energy from 1.8 TeV to 1.96 TeV. The polarization of the promptly produced Ψ(2S) mesons is found to be increasingly longitudinal as p_T increases from 5 GeV/c to 30 GeV/c. The result is compared to contemporary theory models.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 945432
• Report Number(s): FERMILAB-THESIS--2008-58
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
CROSS SECTIONS
DECAY
Experiment-HEP
FERMILAB COLLIDER DETECTOR
LUMINOSITY
MESONS
PARTICLE RAPIDITY
POLARIZATION
PRODUCTION