Chiral extrapolation of the charged-pion magnetic polarizability with Padé approximant
Date
2021
Authors
He, F.
Leinweber, D.B.
Thomas, A.W.
Wang, P.
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Journal article
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Physical Review D, 2021; 104(5):054506-1-054506-7
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Fangcheng He, Derek B. Leinweber, Anthony W. Thomas and Ping Wang
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Abstract
The background magnetic-field formalism of lattice QCD has been used recently to calculate the magnetic polarizability of the charged pion. These nf=2+1 numerical simulations are electroquenched, such that the virtual sea-quarks of the QCD vacuum do not interact with the background field. To understand the impact of this, we draw on partially quenched chiral perturbation theory. In this case, the leading term proportional to 1/Mπ arises at tree level from L4. To describe the results from lattice QCD, while maintaining the exact leading terms of chiral perturbation theory, we introduce a Padé approximant designed to reproduce the slow variation observed in the lattice QCD results. Two-loop contributions are introduced to assess the systematic uncertainty associated with higher-order terms of the expansion. Upon extrapolation, the magnetic polarizability of the charged pion at the physical pion mass is found to be βπ±=−1.70(14)stat(25) syst×10−4 fm3, in good agreement with the recent experimental measurement.
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© 2021 American Physical Society
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http://purl.org/au-research/grants/arc/LE190100021
http://purl.org/au-research/grants/arc/LE160100051
http://purl.org/au-research/grants/arc/DP180100497
http://purl.org/au-research/grants/arc/DP210103706
http://purl.org/au-research/grants/arc/DP190102215
http://purl.org/au-research/grants/arc/DP150103164
http://purl.org/au-research/grants/arc/LE160100051
http://purl.org/au-research/grants/arc/DP180100497
http://purl.org/au-research/grants/arc/DP210103706
http://purl.org/au-research/grants/arc/DP190102215
http://purl.org/au-research/grants/arc/DP150103164