Journal
PHYSICAL REVIEW C
Volume 81, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.81.032201
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Funding
- National Natural Science Foundation of China [10425521, 10675007, 10705002, 10775069, 10935001]
- Major State Basic Research Development Program [G2007CB815000]
- United States Department of Energy, Office of Nuclear Physics [DE-AC02-06CH11357]
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We derive a novel model-independent result for the pion susceptibility in QCD via the isovector-pseudoscalar vacuum polarization. In the neighbourhood of the chiral limit, the pion susceptibility can be expressed as a sum of two independent terms. The first expresses the pion-pole contribution. The second is identical to the vacuum chiral susceptibility, which describes the response of QCD's ground state to a fluctuation in the current-quark mass. In this result one finds a straightforward explanation of a mismatch between extant estimates of the pion susceptibility.
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