LHC searches for exotic new particles

Golling, T.

doi:10.1016/j.ppnp.2016.05.001

Cited by 12 publications

(8 citation statements)

References 472 publications

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“…More information and interpretations are available in the quoted references. Physics beyond the standard model scenarios other than supersymmetry are discussed for example in [54].…”

Section: Supersymmetry Models and Simplified Scenariosmentioning

confidence: 99%

Experimental status of supersymmetry after the LHC Run-I

Autermann

2016

Progress in Particle and Nuclear Physics

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The ATLAS and CMS experiments at the Large Hadron Collider (LHC) at CERN have searched for signals of new physics, in particular for supersymmetry. The data collected until 2012 at center-of-mass energies of 7 and 8 TeV and integrated luminosities of 5 fb −1 and 20 fb −1 , respectively, agree with the expectation from standard model processes. Constraints on supersymmetry have been calculated and interpreted in different models. Limits on supersymmetry particle masses at the TeV scale have been derived and interpreted generally in the context of simplified model spectra. The constrained minimal supersymmetric standard model is disfavored by the experimental results. Natural supersymmetry scenarios with low supersymmetry particle masses remain possible in multiple regions, for example in those with compressed spectra, that are difficult to access experimentally. The upgraded LHC operating at √ s = 13 TeV is gaining sensitivity to the remaining unexplored SUSY parameter space.

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“…More information and interpretations are available in the quoted references. Physics beyond the standard model scenarios other than supersymmetry are discussed for example in [54].…”

Section: Supersymmetry Models and Simplified Scenariosmentioning

confidence: 99%

Experimental status of supersymmetry after the LHC Run-I

Autermann

2016

Progress in Particle and Nuclear Physics

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“…Also, particles with fractional electric charges have been proposed by other theoretical models [11,12] and both ATLAS and CMS collaborations have already performed searches of new heavy lepton-like particles with non-standard electric charges [13,14]. Experimentally, these kinds of particles may be misidentified or unobserved since charged particle identification algorithms generally assume that particles have charges of ±1e [15]. The new proposal maintains the special features of the 331 models, such as the relation between the number of fermionic families and the number of colors in QCD.…”

Section: Introductionmentioning

confidence: 99%

Electric charge quantisation in 331 models with exotic charges

Portales

Barreto

2020

Pramana - J Phys

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The extensions of the Standard Model based on the SU (3) C ⊗ SU (3) L ⊗ U (1) X gauge group are known as 331 Models. Different properties such as the fermion assignment and the electric charges of the exotic spectrum, that defines a particular 331 model, are fixed by a β parameter.In this article we study the electric charge quantization in two versions of the 331 models, set by the conditions β = 1/ 3 √ 3 and β = 0. In these frameworks, arise exotic particles, for instance, new leptons and gauge bosons with a fractional electric charge. Additionally, depending on the version, quarks with non-standard fractional electric charges or even neutral appear. Considering the definition of electric charge operator as a linear combination of the group generators that annihilates the vacuum, classical constraints from the invariance of the lagrangian, and gauge and mixed gauge-gravitational anomalies cancellation, the quantization of the electric charge can be verified in both versions.

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“…Further details about mass limits and searches through other signatures of the excited quarks (and leptons) can be found in the excellent review [31] about Run I, and earlier Run II, searches at LHC for exotic particles.…”

Section: Introductionmentioning

confidence: 99%

Production of exotic composite quarks at the LHC

et al. 2017

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We consider the production at the LHC of exotic composite quarks of charge Q = +(5/3)e and Q = −(4/3)e. Such states are predicted in composite models of higher isospin multiplets (IW = 1 or IW = 3/2). Given their exotic charges (such as 5/3), their decays proceed through the electroweak interactions. We compute decay widths and rates for resonant production of the exotic quarks at the LHC. Partly motivated by the recent observation of an excess by the CMS collaboration in the epT / jj final state signature we focus on pp → U + j → W + + j j → + pT / jj and then perform a fast simulation of the detector reconstruction based on Delphes. We then scan the parameter space of the model (m * = Λ) and study the statistical significance of the signal against the relevant standard model background (W jj followed by leptonic decay of the W gauge boson) providing the luminosity curves as function of m * for discovery at 3-and 5-σ level.

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LHC searches for exotic new particles

Cited by 12 publications

References 472 publications

Experimental status of supersymmetry after the LHC Run-I

Experimental status of supersymmetry after the LHC Run-I

Electric charge quantisation in 331 models with exotic charges

Production of exotic composite quarks at the LHC

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