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Electroweak effective charges and their relation to physical cross sections

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Electroweak effective charges and their relation to physical cross sections

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dc.contributor.author Papavassiliou, Joannis
dc.contributor.author Rafael, Eduardo de
dc.contributor.author Watson, Nicolas Jay
dc.date.accessioned 2015-04-10T08:05:37Z
dc.date.available 2015-04-10T08:05:37Z
dc.date.issued 1997
dc.identifier.citation Papavassiliou, Joannis Rafael, Eduardo de Watson, Nicolas Jay 1997 Electroweak effective charges and their relation to physical cross sections Nuclear Physics B 503 1-2 79 116
dc.identifier.uri http://hdl.handle.net/10550/42991
dc.description.abstract In quantum electrodynamics with fermions f = e,\mu..., knowledge of the vacuum polarization spectral function determined from the tree level e^+e^- -> f^+f^- cross sections, together with a single low energy measurement of the fine structure constant \alpha, enables the construction of the one-loop effective charge \alpha_eff(q^2) for all q^2. It is shown how an identical procedure can be followed in the electroweak sector of the Standard Model to construct three gauge-, scale- and scheme-independent one-loop electroweak effective charges and an effective weak mixing angle from the tree level e^+e^- -> W^+W^-, ZH and e^+\nu_e -> W^+Z, W^+\gamma, W^+H differential cross sections, together with three low energy measurements, which may be chosen to be \alpha and the masses of the W and Z bosons. It is found that the corresponding proper self-energy-like functions thus constructed are identical to those obtained in the pinch technique framework. In this way, it is shown how the concept of effective charges in the electroweak Standard Model is as well-defined and unique as in quantum electrodynamics.
dc.language.iso eng
dc.relation.ispartof Nuclear Physics B, 1997, vol. 503, num. 1-2, p. 79-116
dc.subject Física
dc.title Electroweak effective charges and their relation to physical cross sections
dc.type journal article es_ES
dc.date.updated 2015-04-10T08:05:37Z
dc.identifier.doi 10.1016/S0550-3213(97)00411-2
dc.identifier.idgrec 091133
dc.rights.accessRights open access es_ES

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