Determination of the chiral couplings L-10 and C-87 from semileptonic tau decays
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Determination of the chiral couplings L-10 and C-87 from semileptonic tau decays

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Determination of the chiral couplings L-10 and C-87 from semileptonic tau decays

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dc.contributor.author González Alonso, Martín
dc.contributor.author Pich Zardoya, Antonio
dc.contributor.author Prades Hernández, Joaquim
dc.date.accessioned 2015-02-27T11:00:49Z
dc.date.available 2015-02-27T11:00:49Z
dc.date.issued 2008
dc.identifier.uri http://hdl.handle.net/10550/42502
dc.description.abstract Using recent precise hadronic tau-decay data on the V - A spectral function, and general properties of QCD such as analyticity, the operator product expansion, and chiral perturbation theory, we get accurate values for the QCD chiral order parameters L-10(r)(M-rho) and C-87(r)(M-rho). These two low-energy constants appear at order p(4) and p(6), respectively, in the chiral perturbation theory expansion of the V - A correlator. At order p(4) we obtain L-10(r)(M-rho) = -(5.22 +/- 0.06) x 10(-3). Including in the analysis the two-loop (order p6) contributions, we get L-10(r)(M-rho) = -(4.06 +/- 0.39) x 10(-3) and C-87(r)(M-rho) (4.89 +/- 0.19) x 10(-3) GeV-2. In the SU(2) chiral effective theory, the corresponding low-energy coupling takes the value (l) over bar (5) 13.30 +/- 0.11 at order p(4), and (l) over bar (5) 12.24 +/- 0.21 at order p(6).
dc.language.iso eng
dc.relation.ispartof Physical Review D, 2008, vol. 78, num. 11, p. 116012
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source González Alonso, Martín Pich Zardoya, Antonio Prades Hernández, Joaquim 2008 Determination of the chiral couplings L-10 and C-87 from semileptonic tau decays Physical Review D 78 11 116012
dc.subject Física
dc.title Determination of the chiral couplings L-10 and C-87 from semileptonic tau decays
dc.type info:eu-repo/semantics/article
dc.date.updated 2015-02-27T11:00:50Z
dc.identifier.doi http://dx.doi.org/10.1103/PhysRevD.78.116012
dc.identifier.idgrec 048455

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