Why there is no nuclear dependence in dimuon production

G. E. Brown, Bang Li Zi Bang Li, K. F. Liu

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Comparison of dimuon production in medium mass nuclei with that in the deuteron shows no effect of the nuclear environment for values of 0.1 < x < 0.3, just the region in which the pion excess model has produced an enhancement. In the lowest-order approximation there is no meson excess, which can be understood by the common scaling of all masses and cutoffs mN* mN = mσ* mσ = mω* mω = Λ* Λ, etc. In the next order, correction must be made for the fact that the pion mass mπ does not scale in-medium. This is small. A second correction, pion rescattering by nucleonic excitations, is also small because of the local field correction g'0(q). The g'0(q) is only ~ 0.525 for q = 0, but its growth with q provides an effectively large g'o, and this cancels the attraction in the pionic rescattering channel. Thus the pionic enhancement in the small-x region is suppressed. Inclusion of isobar excitation in the rescattering provides a small enhancement, and the coupling of the ρ-meson between nucleon and isobar can be chosen within the range of preferred values so that there is no net effect of the nuclear environment in the small-x region considered.

Original languageEnglish
Pages (from-to)225-236
Number of pages12
JournalNuclear Physics, Section A
Issue number1
StatePublished - Apr 5 1993

Bibliographical note

Funding Information:
and DOE Grant No. DE-FG05-86-

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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