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High Energy Physics Seminars
Joint HEP/Nuclear Seminar
Tuesday, October 27, 2009
3:30 PM
Physics Building, Room 204
Note special date.

Michael Strickland
[Host: Peter Arnold ]
Gettysburg College
"Reorganizing the QCD pressure at intermediate coupling"
Slideshow (PDF)

ABSTRACT:
The perturbative expansion of the pressure of QCD is known to order g^6 log(g), however, the resulting series is poorly convergent at phenomenologically relevant temperatures/couplings. I will discuss a method for improving the convergence of the successive approximations to the QCD pressure in a systematic manner which exactly reproduces the perturbative series in the weakcoupling limit. The method relies on folding in information about the correct hightemperature degrees of freedom via the hardthermalloop (HTL) resummation scheme. In order to give some background I will also discuss the poor convergence of quantum mechanics for the ground state of an anharmonic oscillator and present results for the three loop HTLimproved pressure of QED. Finally, I will present new results of an HTLimproved calculation of QCD thermodynamics to threeloops and critically discuss how this compares to available lattice data. 
SLIDESHOW:




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