Particles, Astrophysics, and Nuclear Physics Seminar
Lambda Polarization in Exclusive Electroproduction at CLAS
Dr. Mac D.
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
Gant Science Complex