Particles Produced in Association with High Transverse Momentum Single Photons and $$\pi^0$$s in Hadronic Collision

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1989

DOI:https://doi.org/10.2172/1427779· OSTI ID:1427779

Sinanidis, Alexandros Pericles ^[1]

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1. Northeastern U.

The charged and neutral particles produced in association with high transverse momentum ($$Pr_{\tau}$$ > 5.0 GeV /c) photons ($$\gamma$$) and neutral pions ($$\pi^0$$) in p(Cu+Be) and $$\pi^-$$(cu+Be) collisions at vs = 31.5 GeV are studied in this thesis. It was observed that 1) The relative rapidity of the two highest Pr recoiling particles in the events have a jet - like structure. 2) The relative rapidity of the single $$\gamma$$ (or $$\pi^0$$ ) and the highest $$P_{\tau}$$ charged particle accompanying the single $$\gamma$$ (or $$\pi^0$$ ) show that the high $$P_{\tau} \pi^0$$ events have a jet - like structure in the trigger hemisphere whereas the high $$P_{\tau}$$ single $$\gamma$$ events do not. 3) The angular distributions of the particles produced in the reactions show that high $$P_{\tau} \pi^0$$s are accompanied by other particles, whereas high $$P_{\tau}$$ single photons are relatively isolated. 4) The fragmentation distributions of the recoiling particles from the high $$P_{\tau}$$ single photons and $$\pi^0$$s are consistent with the measurements of other experiments. 5) The recoiling particles are consistent with the fragmentation of either a quark or a gluon according to the QCD (Quantum Chromodynamics). In summary, particles produced in association with high transverse momentum single photons and $$\pi^0$$s in hadronic collisions have been measured and their properties are in good agreement with the predictions of the parton model and those of QCD

• 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: 1427779
• Report Number(s): FERMILAB-THESIS-1989-41; 293081
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS