TY - JOUR
T1 - Sea contributions to hadron electric polarizabilities through reweighting
AU - Freeman, Walter
AU - Alexandru, Andrei
AU - Lee, Frank X.
AU - Lujan, Michael
N1 - Funding Information:
We would like to acknowledge Craig Pelissier for his assistance with the GWU-QCD code, and Jacob Finkenrath and Michael Engelhardt for helpful discussions. We are grateful to GWU IMPACT (Institute for Massively Parallel Applications and Computing Technologies) for CPU time and to the Columbian College for logistical support of our GPU cluster. This work was supported in part by DoE grant DE-FG02-95ER40907 and NSF CAREER grant PHY-1151648.
PY - 2012
Y1 - 2012
N2 - As part of our ongoing lattice study of the electric polarizabilities of hadrons using the background field approach, we use reweighting to examine the effect of the field on the sea quarks. As with other reweighting studies, the chief difficulty lies in the construction of a stochastic estimate of the ratio of the fermion determinants. In contrast to the case of reweighting in the quark mass, these estimators converge extremely slowly, and are resistant to common variance-reduction techniques such as low-mode subtraction. However, it is possible to construct an alternate estimator, taking advantage of the fact that we are interested in only perturbatively small fields; this estimator is susceptible to a variance-reduction technique based on a hopping parameter expansion.
AB - As part of our ongoing lattice study of the electric polarizabilities of hadrons using the background field approach, we use reweighting to examine the effect of the field on the sea quarks. As with other reweighting studies, the chief difficulty lies in the construction of a stochastic estimate of the ratio of the fermion determinants. In contrast to the case of reweighting in the quark mass, these estimators converge extremely slowly, and are resistant to common variance-reduction techniques such as low-mode subtraction. However, it is possible to construct an alternate estimator, taking advantage of the fact that we are interested in only perturbatively small fields; this estimator is susceptible to a variance-reduction technique based on a hopping parameter expansion.
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U2 - 10.22323/1.164.0015
DO - 10.22323/1.164.0015
M3 - Conference Article
AN - SCOPUS:85030123915
SN - 1824-8039
VL - Part F130497
JO - Proceedings of Science
JF - Proceedings of Science
M1 - 015
T2 - 30th International Symposium on Lattice Field Theory, Lattice 2012
Y2 - 24 June 2012 through 29 June 2012
ER -