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Revealing timid pseudo-scalars with taus at the LHC
Cacciapaglia, Giacomo,Ferretti, Gabriele,Flacke, Thomas,Serô,dio, Hugo Springer Berlin Heidelberg 2018 The European physical journal. C, Particles and fi Vol.78 No.9
<P>A light pseudo-scalar that is copiously produced at the LHC may still be allowed by present searches. While masses above 65 GeV are effectively covered by di-photon searches, the lower mass window can be tested by a new search for boosted di-tau resonances. We test this strategy on a set of composite Higgs models with top partial compositeness, where most models can be probed with an integrated luminosity below 300 [FORMULA OMISSION].</P>
Cacciapaglia, Giacomo,Parolini, Alberto American Physical Society 2016 Physical review. D Vol.93 No.7
<P>Vectorlike quarks, usually dubbed top partners, are a common presence in composite Higgs models. Being composite objects, their mass is expected to be of the order of their inverse size, that is the condensation scale of the new strong interactions. Light top partners, while not being a generic prediction, are, however, often considered in phenomenological models. We suggest that their lightness may be due to the matching of global't Hooft anomalies of the underlying theory. We check this mechanism in explicit models, showing that, in one case, composite fermions with the quantum numbers of the top quark obtain a mass which is controlled by a soft breaking term and can be made parametrically small.</P>
Singlets in composite Higgs models in light of the LHC 750 GeV diphoton excess
Belyaev, Alexander,Cacciapaglia, Giacomo,Cai, Haiying,Flacke, Thomas,Parolini, Alberto,Serô,dio, Hugo American Physical Society 2016 Physical review. D Vol.94 No.1
<P>Models of compositeness can successfully address the origin of the Higgs boson, as a pseudo-Nambu-Goldstone boson (pNGB) of a spontaneously broken global symmetry, and flavor physics via the partial compositeness mechanism. If the dynamics is generated by a confining gauge group with fermionic matter content, there exists only a finite set of models that have the correct properties to account for the Higgs and top partners at the same time. In this paper, we explore the theory space of this class of models; remarkably, all of them contain-beyond the pNGB Higgs-a pNGB singlet, a, which couples to Standard Model gauge bosons via Wess-Zumino-Witten interactions, thus providing naturally a resonance in the diboson at the LHC. With the assumption that the recently reported diphoton excess at 750 GeVat the LHC arises from the a resonance, we propose a generic approach on how to delineate the best candidate for composite Higgs models with top partners. We find that constraints from other diboson searches severely reduce the theory space of the models under consideration. For the models which can explain the diphoton excess, we make precise and testable predictions for the width and other diboson resonance searches.</P>