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Title: Dielectron Cross Section Measurements in Nucleus-Nucleus Reactions at 1.0{ital A} GeV

Abstract

We present measured dielectron production cross sections for Ca+Ca, C+C, He+Ca, and d+Ca reactions at 1.0 A GeV . Statistical uncertainties and systematic effects are smaller than in previous dilepton spectrometer (DLS) nucleus-nucleus data. For pair mass M{le}0.35 GeV/c{sup 2} we obtain (1) the Ca+Ca cross section is larger than the previous DLS measurement and current model results, (2) the mass spectra suggest large contributions from {pi}{sup 0} and {eta} Dalitz decays, and (3) d{sigma}/dM{proportional_to}A{sub P}A{sub T}. For M{gt}0.5 GeV/c{sup 2} the Ca+Ca to C+C cross section ratio is significantly larger than the ratio of A{sub P}A{sub T} values. {copyright} {ital 1997} {ital The American Physical Society}

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]; ; ; ;  [2]; more »; ; ;  [3]; ; ; ;  [4]; ;  [5];  [6] « less
  1. Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720 (United States)
  2. University of California at Los Angeles, California 90095 (United States)
  3. Universite Blaise Pascal/IN2P3, 63177 Aubiere Cedex (France)
  4. The Johns Hopkins University, Baltimore, Maryland 21218 (United States)
  5. Louisiana State University, Baton Rouge, Louisiana 70803 (United States)
  6. Wayne State University, Detroit, Michigan 48201 (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
OSTI Identifier:
560626
DOE Contract Number:  
AC03-76SF00098; FG02-88ER40413; FG03-88ER40424
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 79; Journal Issue: 7; Other Information: PBD: Aug 1997
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; HEAVY ION REACTIONS; PAIR PRODUCTION; ELECTRONS; CALCIUM; CARBON; HELIUM; DEUTERON REACTIONS; CROSS SECTIONS; MASS SPECTRA; IMPACT PARAMETER

Citation Formats

Porter, R J, Bossingham, R, Gong, W G, Heilbronn, L, Huang, H Z, Krebs, G, Letessier-Selvon, A, Matis, H S, Miller, J, Naudet, C, Roche, G, Schroeder, L S, Seidl, P, Wilson, W K, Yegneswaran, A, Beedoe, S, Carroll, J, Huang, H Z, Igo, G, Bougteb, M, Manso, F, Prunet, M, Roche, G, Christie, W B, Hallman, T, Madansky, L, Welsh, R C, Kirk, P, Wang, Z F, and Wilson, W K. Dielectron Cross Section Measurements in Nucleus-Nucleus Reactions at 1.0{ital A} GeV. United States: N. p., 1997. Web. doi:10.1103/PhysRevLett.79.1229.
Porter, R J, Bossingham, R, Gong, W G, Heilbronn, L, Huang, H Z, Krebs, G, Letessier-Selvon, A, Matis, H S, Miller, J, Naudet, C, Roche, G, Schroeder, L S, Seidl, P, Wilson, W K, Yegneswaran, A, Beedoe, S, Carroll, J, Huang, H Z, Igo, G, Bougteb, M, Manso, F, Prunet, M, Roche, G, Christie, W B, Hallman, T, Madansky, L, Welsh, R C, Kirk, P, Wang, Z F, & Wilson, W K. Dielectron Cross Section Measurements in Nucleus-Nucleus Reactions at 1.0{ital A} GeV. United States. https://doi.org/10.1103/PhysRevLett.79.1229
Porter, R J, Bossingham, R, Gong, W G, Heilbronn, L, Huang, H Z, Krebs, G, Letessier-Selvon, A, Matis, H S, Miller, J, Naudet, C, Roche, G, Schroeder, L S, Seidl, P, Wilson, W K, Yegneswaran, A, Beedoe, S, Carroll, J, Huang, H Z, Igo, G, Bougteb, M, Manso, F, Prunet, M, Roche, G, Christie, W B, Hallman, T, Madansky, L, Welsh, R C, Kirk, P, Wang, Z F, and Wilson, W K. 1997. "Dielectron Cross Section Measurements in Nucleus-Nucleus Reactions at 1.0{ital A} GeV". United States. https://doi.org/10.1103/PhysRevLett.79.1229.
@article{osti_560626,
title = {Dielectron Cross Section Measurements in Nucleus-Nucleus Reactions at 1.0{ital A} GeV},
author = {Porter, R J and Bossingham, R and Gong, W G and Heilbronn, L and Huang, H Z and Krebs, G and Letessier-Selvon, A and Matis, H S and Miller, J and Naudet, C and Roche, G and Schroeder, L S and Seidl, P and Wilson, W K and Yegneswaran, A and Beedoe, S and Carroll, J and Huang, H Z and Igo, G and Bougteb, M and Manso, F and Prunet, M and Roche, G and Christie, W B and Hallman, T and Madansky, L and Welsh, R C and Kirk, P and Wang, Z F and Wilson, W K},
abstractNote = {We present measured dielectron production cross sections for Ca+Ca, C+C, He+Ca, and d+Ca reactions at 1.0 A GeV . Statistical uncertainties and systematic effects are smaller than in previous dilepton spectrometer (DLS) nucleus-nucleus data. For pair mass M{le}0.35 GeV/c{sup 2} we obtain (1) the Ca+Ca cross section is larger than the previous DLS measurement and current model results, (2) the mass spectra suggest large contributions from {pi}{sup 0} and {eta} Dalitz decays, and (3) d{sigma}/dM{proportional_to}A{sub P}A{sub T}. For M{gt}0.5 GeV/c{sup 2} the Ca+Ca to C+C cross section ratio is significantly larger than the ratio of A{sub P}A{sub T} values. {copyright} {ital 1997} {ital The American Physical Society}},
doi = {10.1103/PhysRevLett.79.1229},
url = {https://www.osti.gov/biblio/560626}, journal = {Physical Review Letters},
number = 7,
volume = 79,
place = {United States},
year = {1997},
month = {8}
}