On a possible explanation of the DLS puzzle

M. Bashkanov*, H. Clement

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The enhancement in the dilepton spectrum observed in heavy-ion collisions for invariant electron-positron masses in the range has recently been traced back to a corresponding enhancement in np collisions relative to pp collisions. Whereas the dilepton spectra in the latter are understood quantitatively, theoretical descriptions fail to describe the much higher dilepton rate in np collisions at beam energies below 2GeV, in particular regarding the region . We show that the missing strength can be attributed to rho (0)-channel pi (+) pi (-) production, which is dominated by the t-channel Delta Delta excitation and the recently found isoscalar dibaryonic resonance structure at 2.37 GeV. These processes do not contribute in pp collisions, but only in np collisions.

Original languageEnglish
Article number107
Number of pages6
JournalEuropean Physical Journal A: Hadrons and Nuclei
Volume50
Issue number7
DOIs
Publication statusPublished - 4 Jul 2014

Keywords

  • NUCLEON-NUCLEON COLLISIONS
  • PROTON-PROTON COLLISIONS
  • TOTAL CROSS-SECTIONS
  • DOUBLE-PIONIC FUSION
  • ISOSPIN DECOMPOSITION
  • 2-PION PRODUCTION
  • PP
  • EXCITATION
  • ENERGIES
  • DP

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