Of higgs,unitarity and other questions |
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Authors: | D Bettinelli R Ferrari A Quadri |
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Institution: | 1.Physikalisches Institut,Albert-Ludwigs-Universit?t Freiburg,Freiburg im Breisgau,Germany;2.Center for Theoretical Physics, Laboratory for Nuclear Science and Department of Physics,Massachusetts Institute of Technology,Cambridge,USA;3.Dipartimento di Fisica,Università degli Studi di Milano, and Istituto Nazionale di Fisica Nucleare, Sez. di Milano,Milano,Italy |
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Abstract: | On the verge of conclusive checks on the Standard Model by the LHC, we discuss some of the basic assumptions. The reason for
this analysis stems from a recent proposal of an electroweak model based on a nonlinearly realized gauge group SU(2) ⊗ U(1),
where, in the perturbative approximation, there is no Higgs boson. The model enjoys the Slavnov-Taylor identities and therefore
the perturbative unitarity. On the other hand, it is commonly believed that the existence of the Higgs boson is entangled
with the property of unitarity, when high energy processes are considered. The argument is based mostly on the Froissart bound
and on the equivalence theorem. In this paper we briefly review some of our objections to the validity of such arguments. Some open questions are pointed
out, in particular on the limit of zero mass for the vector mesons and on the fate of the longitudinal polarizations. |
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