Medium modification on vector mesons observed in 12 GeV p + A reactions

M. Naruki, H. En'yo, R. Muto, T. Tabaru, S. Yokkaichi, Y. Fukao, H. Funahashi, M. Ishino, Hiroki Kanda, M. Kitaguchi, S. Mihara, Koji Miwa, T. Miyashita, T. Murakami, T. Nakura, F. Sakuma, M. Togawa, S. Yamada, Y. Yoshimura, J. ChibaM. Ieiri, O. Sasaki, M. Sekimoto, K. H. Tanaka, H. Hamagaki, K. Ozawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The invariant mass spectra of e + e - pairs produced in 12 GeV p+A reactions are measured at the KEK-PS. We observed a significant enhancement over the known hadronic sources on the low-mass side of the ω meson peak. The 95 % C.L. allowed parameter regions for ρ/ω ratio are obtained as ρ/ω < 0.15 and ρ/ω < 0.31 for C and Cu targets, respectively. As for the meson, the data obtained with a Cu target revealed a significant excess on the low-mass side of the meson peak mainly in the βγ < 1.25 region.

Original languageEnglish
Title of host publicationINTERSECTIONS OF PARTICLE AND NUCLEAR PHYSICS
Subtitle of host publication9th Conference on the Intersections of Particle and Nuclear Physics, CIPAN2006
Pages503-505
Number of pages3
DOIs
Publication statusPublished - 2006 Dec 1
EventINTERSECTIONS OF PARTICLE AND NUCLEAR PHYSICS: 9th Conference on the Intersections of Particle and Nuclear Physics, CIPAN2006 - Rio Grande, Puerto Rico
Duration: 2006 May 302006 Jun 3

Publication series

NameAIP Conference Proceedings
Volume870
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherINTERSECTIONS OF PARTICLE AND NUCLEAR PHYSICS: 9th Conference on the Intersections of Particle and Nuclear Physics, CIPAN2006
CountryPuerto Rico
CityRio Grande
Period06/5/3006/6/3

Keywords

  • Mass
  • Meson
  • Modification
  • Omega
  • Phi
  • Rho

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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