Conveners
Non-SUSY and Exotics
- Paul Douglas Jackson (University of Adelaide)
Non-SUSY and Exotics
- Kevin Varvell (University of Sydney (AU))
Non-SUSY and Exotics
- Archil Kobakhidze (The University of Sydney)
Non-SUSY and Exotics
- Mihoko Nojiri (KEK)
Non-SUSY and Exotics
- Thomas Rizzo
Non-SUSY and Exotics
- Geoffrey Norman Taylor (University of Melbourne (AU))
Many extensions to the Standard Model predicts new particles decaying into
two bosons (WW, WZ, ZZ , W/Zgamma, W/ZH and HH) making this a smoking gun
signature. Searches for such diboson resonances have been performed in
final states with different numbers of leptons , photon and jets where new
identification techniques to disentangle the decay products in highly
boosted configuration are being...
Beyond the standard model theories like Extra-Dimensions and Composite Higgs scenarios predict the existence of very heavy resonances compatible with a spin 0 (Radion),spin 1 (W’, Z’) and spin 2 (Graviton) particle with large branching fractions in pairs of standard model bosons ...
Results of searches for new physics in the dijet and multijet final states are presented. These include model-independent and model-specific searches using the dijet invariant mass spectrum and the dijet angular distributions, searches for black holes, quantum and microscopic, in ...
Searches for physics beyond the Standard Model are performed in final
states with high-pT leptons (including tau final states). We will
present results of searches for resonant, and non-resonant phenomena
in dilepton final states, searches for new phenomena in lepton +
missing momentum and lepton flavour violating final states. These
searches target a large range of beyond the Standard...
Numerous new physics models, e.g., theories with extra dimensions and various gauge-group extensions of the standard model, predict the existence of new particles decaying to dilepton, multilepton, and lepton+MET final states. This talk presents searches for new physics in these ...
Results of searches for new particles such as leptoquarks, heavy neutrinos, and W bosons with right-handed couplings in final states with leptons (charged or neutral) and jets are presented. The emphasis is given to the recent results obtained using data collected at Run-II ...
Searches for physics beyond the Standard Model are performed in final
states with at least one high-pT lepton and jets. These searches target a
large range of beyond the Standard Model phenomenology ranging from
leptoquarks, heavy leptons and strong gravity effects. The full 2015 LHC
proton-proton dataset is combined with the data which has been collected so
far during 2016, at √s = 13 TeV.
In the present talk the search for new resonances decaying to ttbar.
The search is performed with the ATLAS experiment at the LHC using
proton-proton collision data. The current status of the ATLAS searches
will be reviewed, addressing the used analysis techniques, in particular
the selection criteria, the background modelling and the related
experimental uncertainties.
Many models of physics beyond the Standard Model (SM) contain enhanced couplings to third generation quarks. We present an overview of searches for new physics containing top and bottom quarks in the final state, using proton- proton collision data collected with the CMS ...
We present results of searches for massive top and bottom quark partners using proton-proton collision data collected with the CMS detector at the CERN LHC at a center-of-mass energy of 8 and 13 TeV. These fourth-generation vector-like quarks are postulated to solve the ...
New vector quarks appear in many beyond the Standard Model trying to
cancel the mass divergence for the Higgs boson. At the LHC such new
quarks can be produced singly or in pairs and, depending on their
decays, can originate several different final states. A topological
approach was followed by ATLAS, allowing to comprehensively cover such
final states in a model independent way. The status...
The search for a spin-0 or spin-2 state decaying into two photons, in a large mass range is presented, using 3.2 ifb of p-p collisions at 13 TeV.
A search for new physics in high-mass diphoton events is presented. The analysis is performed by looking for bumps on the continuum diphoton mass spectrum. This clean signature is sensitive to high-mass gravitons predicted by models with extra dimensions and to scalar ...
A colored heavy particle with sufficiently small width may form non-relativistic bound states when they are produced at the large hadron collider\,(LHC), and they can annihilate into a diphoton final state. The invariant mass of the diphoton would be around twice of the colored particle mass. In this paper, we study if such bound state can be responsible for the 750 GeV diphoton excess...
It is shown that a charged scalar particle $\chi$ of mass around 375 GeV charged under both
$\mathrm{SU}(3)_{\textsc{c}}$ and a new confining
non-abelian gauge interaction can explain the 750 GeV diphoton excess. After
pair production, these interactions confine the exotic scalar into
non-relativistic bound states whose decays into photons can explain the
discrepancy. Taking the new...
The hinted diphoton excess at a mass of 750 GeV suggests the existence
of heavy quarks that mediated the resonance production via gluon fusion.
The decay of the heavy quark into Sq, with q being a SM quark, could
provide a new search channel for heavy quarks.
We consider the case of a singlet vector-like partner of the top quark
and show that it can be searched for at the 13 TeV LHC through...
We discuss the possibility that QCD is not asymptotically free and develops instead an interactive UV fixed point. This can happen if the Standard Model is extended by a set of $N_F$ vector-like fermions that transform non-trivially under $SU(3)_c$, with Yukawa-type interactions mediated by a $N_F\times N_F$ matrix scalar field. We point out that the $750$ GeV diphoton excess can be explained...
We examine the scenario of a warped extra dimension containing bulk SM fields in light of the observed diphoton excess at 750 GeV. We demonstrate that a bulk spin-2 graviton whose action contains localized kinetic brane terms is compatible with the excess, while being consistent with all other constraints. This model contains a single free parameter, the mass of the first gauge Kaluza-Klein...
The radion of the five-dimensional Randall-Sundrum model provides a very natural explanation of the excess in the di-photon channel at 750 GeV recently observed by ATLAS and CMS. Crucial future experimental tests are proposed. Brief comparisons to other models employing extra dimensional physics are made.
We show that the recent diphoton excess observed by the ATLAS and CMS collaborations might originate from the radion of a warped extra dimension when the Higgs is located in the bulk. In this case the couplings of the radion to massive gauge bosons are suppressed, allowing it to evade existing searches. In the presence of kinetic and mass mixing with the Higgs, due to strong constraints from...
Models of compositeness can successfully address the origin of the Higgs boson as a pseudo-Goldstone of a spontaneously broken global symmetry, and flavour physics via the partial compositeness mechanism. If the dynamics is generated by a simple underlying theory defined in terms of a confining gauge group with fermionic matter content, there exists only a finite set of models that have the...
Fermionic and vector resonances are a generic prediction of theories where electroweak symmetry breaking is triggered by new strongly interacting dynamics at the TeV scale.
We work in a "discrete" two site prescription of the Composite Higgs model where the spontaneous breaking of the SO(5)/SO(4) coset gives the Standard Model gauge bosons and six heavy vector resonances. We implement...
Efforts building models of Grand Unification have overwhelmingly been within the framework of Supersymmetry, since it provides the dual benefit of a solution to the hierarchy problem and gauge coupling unification. Any non-supersymmetric model of Grand Unification must necessarily include an alternative solution to the hierarchy problem. In this talk, I will discuss mechanisms such as...
The relaxion mechanism is a novel solution to the hierarchy problem that utilizes the dynamics of an axion-like field. I discuss results from the first statistical analysis of the relaxion mechanism ([arXiv:1602.03889][1]), in which we quantified the relative plausibility of a QCD and a non-QCD relaxion model versus the Standard Model with Bayesian statistics, which includes an automatic...
In the LHC Run 1 CMS reported a 2.8$\sigma$ excess in the
$(2e)(2jets)$ channel around 2.1 TeV. We take this as a hint of
the production of a right-handed weak gauge boson, $W_R$, of the
left-right symmetric model arising from an $SO(10)$ grand unified
theory. We show that a $W_R$ with mass in the TeV region if
embedded in $SO(10)$ requires $0.64 \leq g_R/g_L \leq 0.78$,
when one ...
In this talk I will present our recent work on a non-supersymmetric trinification GUT with a global $\mathrm{SU}(3)$ flavour symmetry. The $\mathrm{SU}(3)$ flavour symmetry solves many of the persistent issues of traditional trinification model building, where models typically contain an uncomfortably large number of free parameters and naturally prefers GUT scale masses for the Standard Model...
Simplified models are a successful way of interpreting current LHC searches for models beyond the standard model (BSM). So far most simplified models have focused on topologies featuring a missing transverse energy (MET) signature. However, in some BSM theories other, more exotic, signatures occur. We discuss the utility of applying the simplified models framework to exotic signatures, such as...
As originally described by Rubakov, particles are produced during the tunneling of a metastable quantum field. We propose to extend his formalism to compute the backreaction of these particles on the semiclassical decay probability of the field. The idea is to integrate out the external bath of particles by computing the reduced density matrix of the system. Following this approach, we derive...
Run2 of the LHC, with its increased center-of-mass energy, is an
unprecedented opportunity to discover physics beyond the Standard
Model. One interesting possibility to conduct such searches is to use
resonances based on jets. The latest search results from the ATLAS
experiment, based on either inclusive or heavy-flavour jets, will be
presented.
A flexible trigger system, excellent vertex locator, ring imaging Cherenkov (RICH) detectors, and forward acceptance allow unique direct searches to be performed at LHC energies using data collected with the LHCb detector, in particular dealing with complementary New Physics parameter regions. A summary of results will be presented, including several SUSY related results, such as searches for...
Results of searches for highly ionising particles and particles with
anomalously high electric charge produced in proton-proton collisions in
the ATLAS detector are presented. Such signatures, encompassing particles
with charges from 10 to 60 times the electron charge, involve high levels
of ionization in the ATLAS detector and can arise from magnetic monopoles
or models involving technicolor,...
Many extensions of the standard model including SUSY predict new particles with long lifetimes, such that the position of their decay is measurably displaced from their production vertex. We present recent results of searches for exotic long-lived particles obtained using data ...
MoEDAL is a pioneering experiment designed to search for highly ionizing messengers of new physics such as magnetic monopoles or massive (pseudo-)stable charged particles.
Recently MoEDAL released its first results on a search for monopoles, using data collected at 8 TeV, and based on a prototype of the magnetic monopole trapper. The trapper material got analysed with a SQUID at the...
In this talk, I will present on the one hand information that we
already have on the properties of the potential
diphoton resonance at M~750 GeV, with a special focus on the flavor
structure. On the other hand, I will discuss how we can gain
further
insights, both directly on the resonance itself and it's relation
with the sector of electroweak symmetry breaking, as well as...
The 750-760 GeV diphoton resonance may be identified as one or two scalars and/or
one or two pseudoscalars contained in the two singlet superfields $S_{1,2}$
arising from the three 27-dimensional representations of $E_6$. We study the corresponding collider signature within the exceptional supersymmetric standard model (E$_6$SSM).This model is based on the SM gauge group together with an...
