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Tests of non-standard electroweak couplings of right-handed quarks

Abstract : The standard model can be interpreted as the leading order of a Low-Energy Effective Theory (LEET) invariant under a higher non linearly realized symmetry Snat ⊃ SU(2)W × U(1)Y equipped with a systematic power counting. Within the minimal version of this ``not quite decoupling'' LEET, the dominant non-standard effect appears at next-to-leading order (NLO) and is a modification of the couplings of fermions to W and Z. In particular, the coupling of right-handed quarks to Z is modified and a direct coupling of right-handed quarks to W emerges. Charged right-handed lepton currents are forbidden by an additional discrete symmetry in the lepton sector originally designed to suppress Dirac neutrino masses. A complete NLO analysis of experimental constraints on these modified couplings is presented. Concerning couplings of light quarks, the interface of the electroweak tests with QCD aspects is discussed in detail.
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Contributor : Sophie Heurteau <>
Submitted on : Thursday, October 1, 2009 - 10:57:45 AM
Last modification on : Wednesday, September 23, 2020 - 4:40:01 AM

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V. Bernard, M. Oertel, E. Passemar, J. Stern. Tests of non-standard electroweak couplings of right-handed quarks. Journal of High Energy Physics, Springer, 2008, 01(2008), pp.015. ⟨10.1088/1126-6708/2008/01/015⟩. ⟨in2p3-00421196⟩



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