Abstract
Abstract Right-handed light quarks could be significantly composite, yet compatible with experimental searches at the LHC and precision tests on Standard Model couplings. In these scenarios, that are motivated by flavor physics, one expects large cross sections for the production of new resonances coupled to light quarks. We study experimental strong signatures of right-handed compositeness at the LHC, and constrain the parameter space of these models with recent results by ATLAS and CMS. We show that the LHC sensitivity could be significantly improved if dedicated searches were performed, in particular in multijet signals.
Highlights
In references [10,11,12,13] it was shown that a different philosophy is possible within the partial compositeness paradigm, where one chirality of SM light quarks has large compositeness
That are motivated by flavor physics, one expects large cross sections for the production of new resonances coupled to light quarks
In the Minimal Flavor Violation (MFV) scenario the electroweak two body decay is entirely negligible for the first generation as it is suppressed by the light quark mass over the vacuum expectation value
Summary
Within the framework of partial compositeness SM fields mix with states of the composite sector of equal quantum numbers under the SM symmetries, see [11] for a detailed discussion. The standard assumption, naturally realized in Randall-Sundrum scenarios, is that the degree of compositeness is controlled by the mass of the SM states Within this logic the light generations are practically elementary and couple only through mixing of the SM gauge fields. Despite the large degree of compositeness, corrections to precisions observables measured at LEP are small and can be compatible with experimental bounds.1 This perhaps counterintuitive possibility is quite naturally realized if the right-handed quarks couple to singlets of the custodial symmetry. This dimension five operator is relevant in our analysis because it controls the decay of the right-handed partners in the region mρ > mQ where the decay into Q → ρ q is kinematically forbidden It is generated by loops of the strong sector fields with a size (see appendix A). In what follows we will only consider the scenario with composite right-handed quarks
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