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Dilaton chiral perturbation theory and applications

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arxiv 2110.07930 v1 pith:MQTYWW6O submitted 2021-10-15 hep-lat hep-ph

Dilaton chiral perturbation theory and applications

classification hep-lat hep-ph
keywords theorychiraldchptapplicationsapproximatedilatonexpansionlight
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We review dilaton chiral perturbation theory (dChPT), the effective low-energy theory for the light sector of near-conformal, confining theories. dChPT provides a systematic expansion in both the fermion mass and the distance to the conformal window. It accounts for the pions and the light scalar, the approximate Nambu-Goldstone bosons for chiral and scale symmetry, respectively. A unique feature of dChPT is the existence of a large-mass regime in which the theory exhibits approximate hyperscaling, while the expansion nevertheless remains systematic. We discuss applications to lattice data, presenting successes as well as directions for future work.

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