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Paper detail

Vacuum pseudoscalar susceptibility

We derive a novel model-independent result for the pion susceptibility in QCD via the isovector-pseudoscalar vacuum polarisation. 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.

preprint2009arXivOpen access
Lei ChangYu-xin LiuCraig D. RobertsYuan-mei ShiWei-Min SunHong-Shi Zong
hep-phhep-latnucl-th
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Lei ChangYu-xin LiuCraig D. RobertsYuan-mei ShiWei-Min SunHong-Shi Zong

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