Journalartikel

Jahr der Veröffentlichung: 2002

Seiten: 26-35

Zeitschrift: Physics Letters B

Bandnummer: 529

Heftnummer: 1-2

ISSN: 0370-2693

eISSN: 1873-2445

Open Access Status: Green

DOI Link: https://doi.org/10.1016/S0370-2693(02)01239-X

Verlag: Elsevier

Abstract: 
The dilepton production from p C and p Cu collisions at T-lab = 12 GeV is calculated using the semiclassical BUU transport model, that includes the off-shell propagation of vector mesons nonperturbatively and calculates the width of the vector mesons dynamically. It is found that the collisional broadening of the vector meson width and dropping vector meson masses lead to a small enhancement of the dilepton yield below the omega meson mass pole in p Cu collisions compared to p C, which is, however, not sufficient to explain the enhanced production of dileptons as observed in the experiment by the KEK-PS E325 Collaboration. It is argued that such in-medium effects are expected to be small due to kinematical reasons-the dominant part of vector mesons radiate dileptons and decay outside the nucleus due to the finite formation time for p and w mesons, which is large by Lorentz covariance since the produced vector mesons move with high velocity relative to the target nucleus. (C) 2002 Elsevier Science B.V. All rights reserved.

Harvard-Zitierstil: Bratkovskaya, E. (2002) ρ/ω properties from dilepton spectra in pA reactions at 12 GeV, Physics Letters B, 529(1-2), Article PII S0370-2693(02)01239-X. pp. 26-35. https://doi.org/10.1016/S0370-2693(02)01239-X

APA-Zitierstil: Bratkovskaya, E. (2002). ρ/ω properties from dilepton spectra in pA reactions at 12 GeV. Physics Letters B. 529(1-2), Article PII S0370-2693(02)01239-X, 26-35. https://doi.org/10.1016/S0370-2693(02)01239-X