Year: 1997
Type: article
Abstract: We present measured dielectron production cross sections for $\mathrm{Ca}+\mathrm{Ca}$, $\mathrm{C}+\mathrm{C}$, $\mathrm{He}+\mathrm{Ca}$, and $d+\mathrm{Ca}$ reactions at $1.0\phantom{\rule{0ex}{0ex}}A\mathrm{GeV}$. Statistical uncertainties and systematic effects are smaller than in previous dilepton spectrometer (DLS) nucleus-nucleus data. For pair mass $M\ensuremath{\le}0.35\mathrm{GeV}{/c}^{2}$ we obtain (1) the $\mathrm{Ca}+\mathrm{Ca}$ cross section is larger than the previous DLS measurement and current model results, (2) the mass spectra suggest large contributions from ${\ensuremath{\pi}}^{0}$ and $\ensuremath{\eta}$ Dalitz decays, and (3) $d\ensuremath{\sigma}/\mathrm{dM}\ensuremath{\propto}{A}_{P}{A}_{T}$. For $M>0.5\phantom{\rule{0ex}{0ex}}\mathrm{GeV}{/c}^{2}$ the $\mathrm{Ca}+\mathrm{Ca}$ to $\mathrm{C}+\mathrm{C}$ cross section ratio is significantly larger than the ratio of ${A}_{P}{A}_{T}$ values.
Source: Physical Review Letters
Authors: R. J. Porter, S. Beedoe, R. Bossingham, M. Bougteb, W. B. Christie, J. Carroll, W. G. Gong, T. Hallman, L. Heilbronn, H. Z. Huang, G. Igo, P. Kirk, G. Krebs, A. Letessier-Selvon, L. Madansky, F. Manso, H. S. Matis, J. Miller, C. Naudet, M. Prunet, G. Roche, L. S. Schroeder, P. Seidl, Z. F. Wang, R. C. Welsh, W. K. Wilson, A. Yegneswaran
Institutions: Lawrence Berkeley National Laboratory, University of California, Berkeley, University of California, Los Angeles, Institut National de Physique Nucléaire et de Physique des Particules, Université Blaise Pascal, Johns Hopkins University, Louisiana State University, Wayne State University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2039430620