Chiral extrapolation of the magnetic polarizability of the neutral pion

doi:10.1103/PhysRevD.102.114509

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	Chiral extrapolation of the magnetic polarizability of the neutral pion
	He, Fangcheng 1; Leinweber, D. B.; Thomas, A. W.; Wang, P.
刊名	PHYSICAL REVIEW D
	2020
卷号	102 期号:11 页码:114509
关键词	PHOTON-PHOTON COLLISIONS CHARGED PION SCATTERING
ISSN号	2470-0010
DOI	10.1103/PhysRevD.102.114509
英文摘要	The magnetic polarizability of the neutral pion has been calculated in the background magnetic-field formalism of lattice QCD. In this investigation, the chiral extrapolation of these lattice results is considered in a formalism preserving the exact leading nonanalytic terms of chiral perturbation theory. The n(f) = 2 + 1 numerical simulations are electro-quenched, 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 and identify the leading contributions of quark-flow connected and disconnected diagrams. While electro-quenching does not impact the leading-loop contribution to the magnetic polarizability, the loops which generate the leading term have yet to be considered in lattice QCD simulations. Lattice QCD results are used to constrain the analytic terms in the chiral expansion and supplementing those with the two-loop result from chiral perturbation theory enables an evaluation of the polarizability at the physical quark mass. The resulting magnetic polarizability of the neutral pion is beta(pi 0) = 3.44(19)(stat)(37)(syst) x 10(-4) fm(3), which lies just above the 1 sigma error bound of the experimental measurement.
学科主题	Astronomy & Astrophysics ; Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/27285]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.[He, Fangcheng; Wang, P.] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China 2.Chinese Acad Sci, CAS Key Lab Theoret Phys, Inst Theoret Phys, Beijing 100190, Peoples R China 3.Leinweber, D. B.] Univ Adelaide, Ctr Subat Struct Matter CSSM, Dept Phys, Adelaide, SA 5005, Australia 4.Thomas, A. W.] Univ Adelaide, Dept Phys, CoEPP, Adelaide, SA 5005, Australia 5.Thomas, A. W.] Univ Adelaide, Dept Phys, CSSM, Adelaide, SA 5005, Australia 6.Wang, P.] Chinese Acad Sci, Theoret Phys Ctr Sci Facil, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	He, Fangcheng,Leinweber, D. B.,Thomas, A. W.,et al. Chiral extrapolation of the magnetic polarizability of the neutral pion[J]. PHYSICAL REVIEW D,2020,102(11):114509.
APA	He, Fangcheng,Leinweber, D. B.,Thomas, A. W.,&Wang, P..(2020).Chiral extrapolation of the magnetic polarizability of the neutral pion.PHYSICAL REVIEW D,102(11),114509.
MLA	He, Fangcheng,et al."Chiral extrapolation of the magnetic polarizability of the neutral pion".PHYSICAL REVIEW D 102.11(2020):114509.