First observation of dielectron production in proton-nucleus collisions below 10 GeV.

G Roche,G Claesson,L Madansky,S Trentalange,T Mulera,A Yegneswaran,G Landaud,G Igo,J Carroll ,A Letessier‐Selvon ,Seidl Pa ,C J Naudet ,Krebs Gf ,Gilot Jf ,D.l Hendrie ,P Kirk ,J Bystrický ,J Gordon ,T J Hallman ,Matis Hs ,Donald H Miller ,Wang Zf ,E Lallier ,L S Schroeder

doi:10.1103/physrevlett.61.1069

First observation of dielectron production in proton-nucleus collisions below 10 GeV.

G Roche, G Claesson + Show 22 more

https://doi.org/10.1103/physrevlett.61.1069

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Journal: Physical Review Letters	Publication Date: Aug 29, 1988
Citations: 101

Affiliation: Lawrence Berkeley National Laboratory, University of California, Berkeley, Johns Hopkins University, University of California, Los Angeles, Institut National de Physique Nucléaire et de Physique des Particules, Louisiana State University, Northwestern University

#Pion Annihilation #Nucleus-nucleus Collisions + Show 8 more

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Abstract

We have begun a program to measure dielectron production in $p$-nucleus and nucleus-nucleus collisions at the LBL Bevalac. Results are presented for the reaction $p+\mathrm{Be}$ at 4.9 GeV. For the first time, direct dilepton production is observed below 10 GeV incident energy. The cross sections are discussed and compared to previous data at higher energies. The observation of a structure at a mass of about 275 MeV suggests that pion annihilation may be the dominant production mechanism in this mass range.

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