Neutral Particle Production in Diffractive Pion-proton and Proton-proton Interactions at 147 GeV/c PDF Download

Author: Austin Napier
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ISBN:
Category : Bubble chambers
Languages : en
Pages : 366

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Category :
Languages : en
Pages :

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A 273,000 picture exposure of the Fermilab 30-Inch Hybrid Bubble Chamber Spectrometer was made to study .pi./sup +/, K/sup +/, and proton collisions with a proton target. A prototype lead glass gamma detector was used to determine energy and production angles of forward gamma rays and neutral pions. Single particle .pi./sup 0/ distributions were compared with .pi./sup +-/ distributions in .pi./sup +/-proton and proton--proton events. Production of fast .pi./sup 0/ and .pi./sup -/ in the proton beam was strongly suppressed relative to that observed in the .pi./sup +/ beam. Production of rho/sup 0/ and rho/sup +/, associated with the .pi./sup +/ beam, contributes to this effect. A sample of leading particle events was isolated by a selection procedure based on the kinematical configuration of all charged particles in the event. Cross sections, charge multiplicity distributions, and single particle distributions were obtained. The leading particle cross sections are predominantly diffractive, however, a decrease at higher energies is expected, due to PPR contributions in the context of a triple-Regge model. 71 references.

Author: Richard Kass
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Category :
Languages : en
Pages : 290

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Author: Yiqun Wang
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Category : Detectors
Languages : en
Pages :

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Author: Daniel Carl Minette
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Category : Neon-proton interactions
Languages : en
Pages : 298

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Author: Jen-Shu Hsieh
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Category : Physics
Languages : en
Pages : 154

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Author:
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Category :
Languages : en
Pages : 11

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Two years ago, at the 12th Winter Workshop on Nuclear Dynamics held here in Snowbird, the authors presented WA80 limits on direct photon production in 200-GeV 32S + Au collisions. It was found that the results were consistent (within 1[sigma]) with the absence of an excess of photons over those that can be accounted for by the two-photon decay branches of [pi]° and [eta] mesons and by the small photon contributions from other radiative decays. They are in the process of finalizing the direct-photon production results from collisions of lead nuclei at 158 GeV/nucleon. The author briefly discusses the status of the analysis and gives some preliminary results at the end of this talk. However, most of this presentation is concerned with a very different aspect of the photon measurements: distributions of neutral pions. In contrast to direct photons which probe initial collision conditions, hadrons, such as neutral pions, interact strongly and decouple late in the reaction evolution and, thus, provide information concerning the system at freeze out. Transverse momentum spectra at low and intermediate p{sub T} relate to thermodynamic and hydrodynamic descriptions of the hot, dense systems. In addition, the high-p{sub T} region reflects the hard-scattering regime and may help one understand initial-state particle production by forming a bridge to proton-proton and proton-nucleus results. It follows that it is essential that the [pi]° measurements cover a large p{sub T} range.

Author:
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Category :
Languages : en
Pages :

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Author:
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Category : Particles (Nuclear physics)
Languages : en
Pages : 16

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Author:
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ISBN:
Category : Pair production
Languages : en
Pages : 23

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