Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2009-11-13
PoS LAT2009:144,2009
Physics
High Energy Physics
High Energy Physics - Lattice
11 pages, 8 figures, presented at the XXVII International Symposium on Lattice Field Theory, July 26-31, 2009, Peking Universi
Scientific paper
We use the background field method to extract the "connected" piece of the neutron electric polarizability. We present results for quenched simulations using both clover and Wilson fermions and discuss our experience in extracting the mass shifts and the challenges we encountered when we lowered the quark mass. For the neutron we find that as the pion mass is lowered below $500\MeV$, the polarizability starts rising in agreement with predictions from chiral perturbation theory. For our lowest pion mass, $m_\pi=320\MeV$, we find that $\alpha_n = 3.8(1.3)\times 10^{-4}\fm^3$, which is still only one third of the experimental value. We also present results for the neutral pion; we find that its polarizability turns negative for pion masses smaller than $500\MeV$ which is puzzling.
Alexandru Andrei
Lee Frank X.
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