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Nuclear Physics Seminars

ics Nuclear
Thursday, March 15, 2007
4:00 PM
Physics Building, Room 204
Note special date.
Note special time.
William Detmold [Host: Hank Thacker ]
INT, U. of Washington
"External Fields in Lattice Hadron Physics"
 Slideshow (PDF)
Lattice QCD is a numerical method for solving the complicated dynamics of QCD in the non-perturbative, low energy regime, allowing computations of the spectrum and strong interactions of hadrons. To investigate the interactions of these hadrons with the remainder of the Standard Model (leptons and the electro-weak gauge bosons) and physics beyond the Standard Model, external operators must be included. This can be done by calculating hadron matrix elements with explicit operator insertions and generally also using external field techniques. In this second approach, the properties of hadrons are computed in an appropriate classical background field (e.g., electroweak) and their modification from the zero external field case determines the quantity of interest. I will discuss the advantages and disadvantages of this approach giving examples including the electromagnetic and spin polarisabilities of hadrons and the nuclear modification of parton distributions (the EMC effect).

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