On a possible explanation of the DLS puzzle

M. Bashkanov; H. Clement

doi:10.1140/epja/i2014-14107-9

On a possible explanation of the DLS puzzle

M. Bashkanov, H. Clement^*

^*Corresponding author for this work

Physics

Research output: Contribution to journal › Letter › peer-review

Abstract

The enhancement in the dilepton spectrum observed in heavy-ion collisions for invariant electron-positron masses in the range 0.15 GeV < M_e + _e- < 0.6 GeV 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 M_e + _e- < 0.3 GeV. We show that the missing strength can be attributed to ρ ⁰-channel π ⁺ π ^- production, which is dominated by the t-channel ΔΔ 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 language	English
Article number	107
Number of pages	6
Journal	European Physical Journal A
Volume	50
Issue number	7
DOIs	https://doi.org/10.1140/epja/i2014-14107-9
Publication status	Published - Jul 2014

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title = "On a possible explanation of the DLS puzzle",

abstract = "The enhancement in the dilepton spectrum observed in heavy-ion collisions for invariant electron-positron masses in the range 0.15 GeV < Me + e- < 0.6 GeV 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 Me + e- < 0.3 GeV. We show that the missing strength can be attributed to ρ 0-channel π + π - production, which is dominated by the t-channel ΔΔ 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.",

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AB - The enhancement in the dilepton spectrum observed in heavy-ion collisions for invariant electron-positron masses in the range 0.15 GeV < Me + e- < 0.6 GeV 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 Me + e- < 0.3 GeV. We show that the missing strength can be attributed to ρ 0-channel π + π - production, which is dominated by the t-channel ΔΔ 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.

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VL - 50

JO - European Physical Journal A

JF - European Physical Journal A

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On a possible explanation of the DLS puzzle

Abstract

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