Measurement of the Nuclear Dependence of Direct Photon and Neutral Meson Production at High Transverse Momentum by Negative 515-GeV/c Pions Incident on Beryllium and Copper Targets

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1995

DOI:https://doi.org/10.2172/1372345· OSTI ID:1372345

Sorrell, Lee Ronald ^[1]

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1. Michigan State Univ., East Lansing, MI (United States)

The nuclear dependence of inclusive direct photon production and inclusive neutral meson production by a 515 GeV/c $$\pi^-$$ beam has been measured using data collected by the E706 experiment during the 19.90 fixed, target run at the Fermi National Accelerator Laboratory. The experiment utilized a finely segmented liquid argon calorimeter and a high precision charged particle spectrometer to make precision measurements of inclusive direct photon, neutral pion, and $$\eta$$ production in the rapidity interval from -0.75 < $$y$$ < 0.75. The $$\pi^0$$ data is reported for the $$P_T$$ range from 0.6 GeV /c to 12 GeV /c, while the $$\eta$$ data is reported for the range from 3.5 GeV /c to 7.0 GeV /c. The direct photon nuclear dependence results are reported for the range from approxlmately 4.0 GeV/c to 8.5 GeV/c. The data from the beryllium and copper targets have been fit using the parameterization $$\sigma_A$$ = $$\sigma_0$$ x $$A^{\alpha}$$. The neutral meson results are in good agreement with previous charged meson results. The direct photon results are consistent with no anomalous enhancement.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1372345
• Report Number(s): FERMILAB-THESIS--1995-52; UMI--96-05947; 406538
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS