Probing the anomalous triple gauge boson couplings in e+e?→W+W? using W polarizations with polarized beams

摘要

We study the anomalous W + W ? V ( V = γ , Z ) couplings in e + e ? → W + W ? using the complete set of polarization observables of W boson with longitudinally polarized electron ( e ? ) and positron ( e + ) beams. For the effective W + W ? V couplings, we use the most general Lorentz invariant form factor parametrization as well as S U ( 2 ) × U ( 1 ) invariant dimension-6 effective operators. We estimate simultaneous limits on the anomalous couplings using the Markov-chain Monte?Carlo method for an e + e ? collider running at the center of mass energy of s = 500 ? ? GeV and the integrated luminosity of L = 100 ? ? fb ? 1 , 3.2 ? ? ab ? 1 and 4 ? ? ab ? 1 . The best limits on the anomalous couplings are obtained for e ? and e + polarization being ( ± 0.8 , ? 0.6 ) for both 100 ? ? fb ? 1 and 3.2 ? ? ab ? 1 of luminosity.