Particles, Astrophysics, and Nuclear Physics Seminar

Lambda Polarization in Exclusive Electroproduction at CLAS

Dr. Mac D. Mestayer
Jefferson Lab
Newport News, VA

The CLAS collaboration at JLab has recent results on Λ polarization for both electroproduction and photoproduction of K+Λ exclusive states. I note the striking phenomenological trends in the data and discuss the underlying physics which might give rise to these phenomena; both in the context of an effective Lagrangian formalism, where the degrees of freedom are intermediate mesons and baryons, and also in the context of a simple quark picture. The quark model argument leads to the conclusion that the s and sbar quarks are produced with spins anti-aligned, in apparent contradiction to the popular 3P0 model of quark pair creation in which the pair is created with vacuum quantum numbers.

Monday, March 26, 2007
2:00 pm
Gant Science Complex
Physics Department
Room P121

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