Abstract
A new physics scenario shows that four-fermion operators of Nambu-Jona-Lasinio (NJL) type have a strong-coupling UV fixed point, where composite fermions F (bosons Pi ) form as bound states of three (two) SM elementary fermions and they couple to their constituents via effective contact interactions at the composite scale Lambda approx {{{mathcal {O}}}} (TeV). We present a phenomenological study to investigate such composite particles at the LHC by computing the production cross sections and decay widths of composite fermions in the context of the relevant experiments at the LHC with pp collisions at sqrt{s}=13 TeV and sqrt{s}=14 TeV. Systematically examining all the different composite particles F and the signatures with which they can manifest, we found a vast spectrum of composite particles F that has not yet been explored at the LHC. Recasting the recent CMS results of the resonant channel pprightarrow e^+F rightarrow e^+e^- qbar{q}' (as F=E), we find that the composite fermion mass m_F below 4.25 TeV is excluded for Lambda /m_F = 1. We further highlight the region of parameter space where this specific composite particle F can appear using 3 hbox {ab}^{-1}, expected by the High-Luminosity LHC, computing 3 and 5 sigma contour plots of its statistical significance.
Highlights
The parity-violating gauge symmetries and spontaneous/. Explicit breaking of these symmetries for the hierarchy pattern of fermion masses have been at the center of a conceptual elaboration that has played a major role in donating to mankind the beauty of the Standard Model (SM) and possible scenarios beyond SM for fundamental particle physics
For the first time for this model, the spectrum of composite particles and contact interactions in quark-lepton and quark-quark sectors in relationship to their phenomenology at the LHC in order to unveil their discovery potential
The cross sections and decay rates of composite particles are calculated based on the LHC physics from pp collision at high energy TeV scale
Summary
Explicit breaking of these symmetries for the hierarchy pattern of fermion masses have been at the center of a conceptual elaboration that has played a major role in donating to mankind the beauty of the Standard Model (SM) and possible scenarios beyond SM for fundamental particle physics. Among these models, are of particular interest composite-fermion scenarios that have offered a possible solution to the hierarchy pattern of fermion masses [21,22,23,24] In this context [25,26,27,28,29], the assumption is that SM quarks “q” and leptons “ ” are assumed to be bound states of some not yet observed fundamental constituents generically referred to as. In the scaling domain of IR fixed point of the weak four-fermion coupling G at the electroweak scale v ≈ 239.5 GeV, effective operators (1) give rise to SM physics with tightly composite Higgs particle via the NJL mechanism, and offers possible solution to the hierarchy pattern of fermion masses [43,45,46,47,48,49,50,51,52,53,54,55,56].
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