Experimental signature of the medium modification for rho and omega mesons in 12-GeV p + A reactions - INSPIRE

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Experimental signature of the medium modification for rho and omega mesons in 12-GeV p + A reactions

Apr, 2005

10 pages

Published in:

Phys.Rev.Lett. 96 (2006) 092301

e-Print:

nucl-ex/0504016 [nucl-ex]

DOI:

10.1103/PhysRevLett.96.092301

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Abstract:

The invariant mass spectra of e+e- pairs produced in 12-GeV proton-induced nuclear reactions are measured at the KEK Proton-Synchrotron. On the low-mass side of the omega meson peak, a significant enhancement over the known hadronic sources has been observed. The mass spectra, including the excess, are well reproduced by a model that takes into account the density dependence of the vector meson mass modification, as theoretically predicted.

24.85.+p
14.40.Cs
25.40.Ve
21.65.+f
p nucleus: nuclear reaction
electron: pair production
mass spectrum: (positron electron)
vector meson: hadroproduction
vector meson: leptonic decay
rho(770): mass

References(23)

Figures(0)

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