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Chiral condensates from tau decay: a critical reappraisal

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Chiral condensates from tau decay: a critical reappraisal

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dc.contributor.author Bordes Villagrasa, José M.
dc.contributor.author Domínguez, Cesáreo A.
dc.contributor.author Peñarrocha Gantes, José Antonio
dc.contributor.author Schilcher, K.
dc.date.accessioned 2015-03-12T13:31:20Z
dc.date.available 2015-03-12T13:31:20Z
dc.date.issued 2006
dc.identifier.citation Bordes Villagrasa, José M. Domínguez, Cesáreo A. Peñarrocha Gantes, José Antonio Schilcher, K. 2006 Chiral condensates from tau decay: a critical reappraisal Journal of High Energy Physics 2006 2 037-1 037-16
dc.identifier.uri http://hdl.handle.net/10550/42728
dc.description.abstract The saturation of QCD chiral sum rules is reanalyzed in view of the new and complete analysis of the ALEPH experimental data on the difference between vector and axial-vector correlators (V-A). Ordinary finite energy sum rules (FESR) exhibit poor saturation up to energies below the tau-lepton mass. A remarkable improvement is achieved by introducing pinched, as well as minimizing polynomial integral kernels. Both methods are used to determine the dimension d=6 and d=8 vacuum condensates in the Operator Product Expansion, with the results: {O}_{6}=-(0.00226 \pm 0.00055) GeV^6, and O_8=-(0.0053 \pm 0.0033) GeV^8 from pinched FESR, and compatible values from the minimizing polynomial FESR. Some higher dimensional condensates are also determined, although we argue against extending the analysis beyond dimension d = 8. The value of the finite remainder of the (V-A) correlator at zero momentum is also redetermined: \Pi (0)= -4 \bar{L}_{10}=0.02579 \pm 0.00023. The stability and precision of the predictions are significantly improved compared to earlier calculations using the old ALEPH data. Finally, the role and limits of applicability of the Operator Product Expansion in this channel are clarified.
dc.language.iso eng
dc.relation.ispartof Journal of High Energy Physics, 2006, vol. 2006, num. 2, p. 037-1-037-16
dc.subject Física
dc.title Chiral condensates from tau decay: a critical reappraisal
dc.type journal article es_ES
dc.date.updated 2015-03-12T13:31:20Z
dc.identifier.doi 10.1088/1126-6708/2006/02/037
dc.identifier.idgrec 023795
dc.rights.accessRights open access es_ES

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