Effective fermion-Higgs interactions at an e⁺e⁻ collider with polarized beams
Date
2016
Authors
Huitu, K.
Rao, K.
Rindani, S.
Sharma, P.
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Journal article
Citation
Nuclear Physics B, 2016; 911:274-294
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Katri Huitu, Kumar Rao, Saurabh D.Rindani, Pankaj Sharma
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Abstract
We consider the possibility of new physics giving rise to effective interactions of the form e<sup>+</sup>e<sup>−</sup>Hff¯, where f represents a charged lepton ℓ or a (light) quark q, and H the recently discovered Higgs boson. Such vertices would give contributions beyond the standard model to the Higgs production processes e<sup>+</sup>e<sup>−</sup>→Hℓ<sup>+</sup>ℓ<sup>−</sup> and e<sup>+</sup>e<sup>−</sup>→Hqq¯ at a future e<sup>+</sup>e<sup>−</sup> collider. We write the most general form for these vertices allowed by Lorentz symmetry. Assuming that such interactions contribute in addition to the standard model production processes, where the final-state fermion pair comes from the decay of the Z boson, we obtain the differential cross section for the processes e<sup>+</sup>e<sup>−</sup>→Hℓ<sup>+</sup>ℓ<sup>−</sup> and e<sup>+</sup>e<sup>−</sup>→Hqq¯ to linear order in the effective interactions. We propose several observables with differing CP and T properties which, if measured, can be used to constrain the couplings occurring in interaction vertices. We derive possible limits on these couplings that may be obtained at a collider with centre-of-mass energy of 500 GeV and an integrated luminosity of 500 fb<sup>−1</sup>. We also carry out the analysis assuming that both the electron and positron beams can be longitudinally polarized, and find that the sensitivity to the couplings can be improved by a factor of 2–4 by a specific choice of the signs of the polarizations of both the electron and positron beams for the same integrated luminosity.
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© 2016 The Author(s). Published by Elsevier B.V. Open Access funded by SCOAP³ - Sponsoring Consortium for Open Access