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58 - More on spectral sum rules

from Part X - QCD spectral sum rules

Stephan Narison
Affiliation:
Université de Montpellier II
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Summary

QSSR have wider applications and can also be applied to theories other than QCD as it is based on first principles of analyticity and duality.

Some other applications in QCD

Some other applications of QSSR have been already reviewed in details in the book [3], which we list below:

  • Baryons at large Nc.

  • String tension from Wilson loops.

  • Relation between lattice correlators and chiral symmetry breaking in the continuum limit.

  • Two-dimensional QCD.

Electroweak models with dynamic symmetry breaking

QSSR has been also extended in order to give dynamic constraints on fermions and W, Z bosons assumed to be bound states of preons (haplons) where the structures may manifest at the TeV scale. The analysis has been done by assuming that at that scale, one can have a strong interaction theory of preons that is closely analogous to QCD describing the electroweak interactions, with the exception that one has to be careful on the chirality of the theories:

  • In [868] and [869], (reviewed in [870]), QSSR (Laplace and FESR) have been used in order to test the consistency of the compositeness assumption for the W and Z bosons and its spin zero partners, in the haplon model proposed by Fritzsch and Mandelbaum [871], leading to a duality constraint between the boson masses and couplings with the continuum threshold (compositeness scale).

  • […]

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QCD as a Theory of Hadrons
From Partons to Confinement
, pp. 696 - 698
Publisher: Cambridge University Press
Print publication year: 2004

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