Nuclear Theory Seminars at Texas A&M: Fall 2005

Location: Cyclotron Building (434), Seminar Room


Friday, September 9, 2:00pm

Dr. Daniel Cabrera, Texas A&M University
φ and ω mesons in a nuclear medium and the nuclear photoproduction reaction I

Abstract:

Recent experimental results from p-A and nuclear photoproduction reactions suggest that nuclear medium effects have been observed in the distribution of the vector meson decay products (ex: φ → K+K-, e+e-; ω → π0γ), although a direct interpretation in terms of modified vector meson mass and/or decay width is not straightforward.

We discuss, as a complementary source of information, the study of the A-dependence of the φ-nuclear photoproduction cross section, which can be meassured by looking at the φ-flux reduction with respect to the elementary reaction on the nucleon. This observable can be directly related to the φ-meson decay width in the nuclear medium. We compare our theoretical results from a many body calculation of the φ-meson selfenergy with recent data from the LEPS Collaboration (Spring8/Osaka). The possibility of such a study for the ωmeson is also discussed.


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