University of Connecticut

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Particle, Astrophysics, and Nuclear Physics Seminar

Monday, November 1, 2010
2:00pm – 3:30pm

Storrs Campus

Dr. Guillaume Beuf, Brookhaven National Laboratory, Upton, N.Y.

“Universal Behavior of Gluon Saturation at High Energy Beyond the Leading Logarithmic Approximation.”

As one increase the total energy in a hadronic or nuclear collision, one probes the wave-functions of the projectiles with a better and better time resolution. Hence, one resolves softer and softer gluons, which are short-lived fluctuations of harder partons in the wave-functions. At high enough energy, the occupancy of the resolved soft gluons becomes high, so that their further evolution is nonlinear. This is the phenomenon of gluon saturation. That nonlinear evolution of the hadronic wave-functions has strong analogies with some reaction-diffusion models. Borrowing some tools from statistical physics, one can argue that the high energy asymptotics of the wave-functions is universal, i.e. independent of the nature of the projectiles. Some of the universal features of the solutions can be computed analytically despite the nonlinear nature of the problem. After reviewing those results, I will present their extension beyond the leading logarithmic approximation of QCD at high energy.


Dawn Rawlinson 486-4916

Physics Department (primary)

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