Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The production of prompt electron-positron pairs in 16 GeV/c .pi.−p collisions has been measured using the LASS spectrometer at SLAC. An excess of events is observed above the estimated contributions of direct and Dalitz decay of known resonances in the kinematic range defined by 0.1 less than or equal to x less than or equal to 0.45, 0 less than or equal to P/sub T/ less than or equal to 0.8 GeV/c and 0.2 less than or equal to M(ee−) less than or equal to 0.7 GeV/c2. The excess signal decreases slowly with increasing M, but exhibits very steep x and P/sub T/2 dependence. The contribution of this signal to the e+e−/.pi./sup +/.pi.− and .gamma./.pi. ratios is discussed. Detailed comparisons are made between e/sup +/e− distributions and the corresponding low mass .mu./sup +/.mu.− distributions, and a simple production mechanism is proposed which describes the 16 GeV/c data well. The implications for direct photon production are presented, and it is shown that the model provides simultaneously a good description of the experimental data on the (e/.pi.) and (.mu./.pi.) ratios for p/sub T/
Direct Electron Pair Production In. Pi. −p Interactions at 16 GeV/c and a Model for Direct Lepton and Photon Production at Low P/sub T.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The production of prompt electron-positron pairs in 16 GeV/c .pi.−p collisions has been measured using the LASS spectrometer at SLAC. An excess of events is observed above the estimated contributions of direct and Dalitz decay of known resonances in the kinematic range defined by 0.1 less than or equal to x less than or equal to 0.45, 0 less than or equal to P/sub T/ less than or equal to 0.8 GeV/c and 0.2 less than or equal to M(ee−) less than or equal to 0.7 GeV/c2. The excess signal decreases slowly with increasing M, but exhibits very steep x and P/sub T/2 dependence. The contribution of this signal to the e+e−/.pi./sup +/.pi.− and .gamma./.pi. ratios is discussed. Detailed comparisons are made between e/sup +/e− distributions and the corresponding low mass .mu./sup +/.mu.− distributions, and a simple production mechanism is proposed which describes the 16 GeV/c data well. The implications for direct photon production are presented, and it is shown that the model provides simultaneously a good description of the experimental data on the (e/.pi.) and (.mu./.pi.) ratios for p/sub T/
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The production of prompt electron-positron pairs in 16 GeV/c .pi.−p collisions has been measured using the LASS spectrometer at SLAC. An excess of events is observed above the estimated contributions of direct and Dalitz decay of known resonances in the kinematic range defined by 0.1 less than or equal to x less than or equal to 0.45, 0 less than or equal to P/sub T/ less than or equal to 0.8 GeV/c and 0.2 less than or equal to M(ee−) less than or equal to 0.7 GeV/c2. The excess signal decreases slowly with increasing M, but exhibits very steep x and P/sub T/2 dependence. The contribution of this signal to the e+e−/.pi./sup +/.pi.− and .gamma./.pi. ratios is discussed. Detailed comparisons are made between e/sup +/e− distributions and the corresponding low mass .mu./sup +/.mu.− distributions, and a simple production mechanism is proposed which describes the 16 GeV/c data well. The implications for direct photon production are presented, and it is shown that the model provides simultaneously a good description of the experimental data on the (e/.pi.) and (.mu./.pi.) ratios for p/sub T/
Direct Electron Pair Production In. Pi. −p Interactions at 16 GeV
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The production of prompt electron-positron pairs in 16 GeV/c .pi.−p collisions has been measured using the LASS spectrometer at SLAC. An excess of events is observed above the estimated contributions of direct and Dalitz decay of known resonances in the kinematic range defined by 0.1 less than or equal to x less than or equal to 0.45, 0 less than or equal to P/sub T/ less than or equal to 0.8 GeV/c and 0.2 less than or equal to M(ee−) less than or equal to 0.7 GeV/c2. The excess signal decreases slowly with increasing M, but exhibits very steep x and P/sub T/2 dependence. The contribution of this signal to the ee−/.pi./sup +/.pi.− and .gamma./.pi. ratios is discussed. Detailed comparisons are made between e/sup +/e− distributions and the corresponding low mass .mu./sup +/.mu.− distributions, and a simple production mechanism is proposed which describes the 16 GeV/c data well. The implications for direct photon production are presented, and it is shown that the model provides simultaneously a good description of the experimental data on the (e/.pi.) and (.mu./.pi.) ratios for p/sub T/
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The production of prompt electron-positron pairs in 16 GeV/c .pi.−p collisions has been measured using the LASS spectrometer at SLAC. An excess of events is observed above the estimated contributions of direct and Dalitz decay of known resonances in the kinematic range defined by 0.1 less than or equal to x less than or equal to 0.45, 0 less than or equal to P/sub T/ less than or equal to 0.8 GeV/c and 0.2 less than or equal to M(ee−) less than or equal to 0.7 GeV/c2. The excess signal decreases slowly with increasing M, but exhibits very steep x and P/sub T/2 dependence. The contribution of this signal to the ee−/.pi./sup +/.pi.− and .gamma./.pi. ratios is discussed. Detailed comparisons are made between e/sup +/e− distributions and the corresponding low mass .mu./sup +/.mu.− distributions, and a simple production mechanism is proposed which describes the 16 GeV/c data well. The implications for direct photon production are presented, and it is shown that the model provides simultaneously a good description of the experimental data on the (e/.pi.) and (.mu./.pi.) ratios for p/sub T/
Direct Electron Pair Production in Pi-minus Proton Interactions at 16.1 GeV/c
Author: David L. Blockus
Publisher:
ISBN:
Category : Collisions (Nuclear physics)
Languages : en
Pages : 168
Book Description
Publisher:
ISBN:
Category : Collisions (Nuclear physics)
Languages : en
Pages : 168
Book Description
A Guide to Data in Elementary Particle Physics
Author: G. P. Yost
Publisher:
ISBN:
Category : Information storage and retrieval systems
Languages : en
Pages : 604
Book Description
Publisher:
ISBN:
Category : Information storage and retrieval systems
Languages : en
Pages : 604
Book Description
A Study of Electron Pair Production in 16 GeV/C PI-minus Proton Collisions
Author: Max Marshall
Publisher:
ISBN:
Category :
Languages : en
Pages : 474
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 474
Book Description
Energy Research Abstracts
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 906
Book Description
Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 906
Book Description
Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Nuclear Science Abstracts
Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 1216
Book Description
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 1216
Book Description
High Energy Physics, 1980
Author: Loyal Durand
Publisher:
ISBN:
Category : Nuclear physics
Languages : en
Pages : 844
Book Description
Publisher:
ISBN:
Category : Nuclear physics
Languages : en
Pages : 844
Book Description
Direct Photon and Pi ̊ Production in Pi-p, Pi+p and Pp Interactions at 280 GeV/c
Author: Stephen Christopher Jack
Publisher:
ISBN:
Category : Photons
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category : Photons
Languages : en
Pages :
Book Description
Electron Pair Production in P + Be and Ca + Ca Collisions at the Bevalac
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
We report on the measurements of direct electron pair production in p-Be interactions at 1.0, 2.1 and 4.9 GeV and Ca + Ca at 1.0 and 2.0 GeV/A. The distributions of invariant mass and p/sub t/ are presented along with the total cross section. We observe a structure in the invariant mass spectra at approximately 275 MeV for 2.0 and 4.9 GeV p + Be data. A rapid decrease in the p + Be total cross-section is observed between 2.1 and 1.0 GeV. Both observations are consistent with the interpretation that pion-pion annihilations dominate production mechanism. 10 refs., 3 figs., 1 tab.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
We report on the measurements of direct electron pair production in p-Be interactions at 1.0, 2.1 and 4.9 GeV and Ca + Ca at 1.0 and 2.0 GeV/A. The distributions of invariant mass and p/sub t/ are presented along with the total cross section. We observe a structure in the invariant mass spectra at approximately 275 MeV for 2.0 and 4.9 GeV p + Be data. A rapid decrease in the p + Be total cross-section is observed between 2.1 and 1.0 GeV. Both observations are consistent with the interpretation that pion-pion annihilations dominate production mechanism. 10 refs., 3 figs., 1 tab.