Conveners
Alternatives to Supersymmetry: Session 1
- Koji Terashi (University of Tokyo (JP))
- Giuliano Panico (The Barcelona Institute of Science and Technology (BIST) (ES))
Alternatives to Supersymmetry: Session 2
- Robin Erbacher (University of California Davis (US))
- Koji Terashi (University of Tokyo (JP))
Alternatives to Supersymmetry: Session 3
- Giuliano Panico (The Barcelona Institute of Science and Technology (BIST) (ES))
- Robin Erbacher (University of California Davis (US))
Alternatives to Supersymmetry: Session 4
- Giuliano Panico (The Barcelona Institute of Science and Technology (BIST) (ES))
- Hsin-Chia Cheng (University of California, Davis )
I present the most general bounds we can make on operators in hidden CFTs, which are weakly coupled to the SM via a heavy mediator. The conformal symmetry dictates an unusual phase space for the generated particles, which led H. Georgi to coin the term 'Unparticles'. Using the unparticle formalism, we constrain a large class of hidden valley theories without the need to specify their particle...
Little Higgs models are a class of models to solve the hierarchy
problem by protecting the Higgs mass at one loop with the help
of global symmetries.
We were studying the constraints by recasting the most prominent SUSY signatures like jets (and leptons) plus missing transverse energy.
In order to relax bounds from direct detection searches for dark matter we also consider the collider...
Many Standard Model extensions that address the hierarchy problem contain Dirac-fermion partners of the top quark, which are typically expected around the TeV scale. Searches for these vector-like quarks mostly focus on their decay into electroweak gauge bosons or Higgs plus a standard model quark. In this talk, backed by models of composite Higgs, we propose a set of simplified scenarios that...
Vector like quarks appear in many theories beyond the Standard Model as a way to cancel the mass divergence for the Higgs boson. The current status of the ATLAS searches for the production of vector like quarks will be reviewed for proton-proton collisions at 13 TeV. This presentation will address the analysis techniques, in particular the selection criteria, the background modeling and the...
We present results of searches for massive vector-like 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 13 TeV. Single and pair production of vector-like quarks are studied, with decays into a variety of final states, containing top and bottom quarks, electroweak gauge and Higgs bosons. We search...
We present an overview of searches for new physics with top and bottom quarks in the final state, using proton-proton collision data collected with the CMS detector at the CERN LHC at a center-of-mass energy of 13 TeV. The results cover non-SUSY based extensions of the SM, including heavy gauge bosons, 3rd generation leptoquarks, or excited third generation quarks. Decay channels to...
I discuss the production of bileptons at LHC, as predicted in the
so-called 3-3-1 model, yielding final states with two same-sign lepton pairs.
I will show that this signal can be easily separated from the SM backgrounds
and investigate the comparison between scalar (Higgs-like) and vector bileptons, as they are both present in the 3-3-1 scenario.
Several theories beyond the Standard Model predict the existence of new heavy particles decaying into pairs of gauge bosons. In this presentation the latest ATLAS results on searches for resonances decaying into pairs of W bosons, Z bosons or photons focusing on fully leptonic decay channels, based on 36 fb-1 of pp collision data collected at 13 TeV will be discussed.
Many theories beyond the standard model predict new phenomena which decay to leptons and/or jets. Searches for new physics models with these signatures are performed using the ATLAS experiment at the LHC. The results reported here use the pp collision data sample collected by the ATLAS detector at the LHC with a centre-of-mass energy of 13 TeV.
We present the result of the search for vector-like leptons in multilepton final states using proton-proton collision data collected with the CMS detector at 13 TeV. Events are primarily categorized into either two light leptons (electron or muon) plus a hadronic tau or three and more light leptons. The scalar sum of transverse momenta of leptons and the missing transverse energy are used to...
We examine the phenomenology of the production, at the 13 TeV Large Hadron
Collider (LHC), of a heavy resonance $X$, which decays via other new on-shell particles $n$ into multi- (i.e.\ three or more) photon final states. In the limit that $n$ has a much smaller mass than $X$, the multi-photon final state may dominantly appear as a two-photon final state because the $\gamma$s from the $n$...
A summary of searches for heavy resonances with masses exceeding 1 TeV decaying into dibosons is presented, performed on data produced by LHC pp collisions at $\sqrt{s}$ = 13 TeV and collected with the CMS detector during 2016 and 2017. The common feature of these analyses is the boosted topology, namely the decay products of the considered bosons (both electroweak W, Z bosons and the Higgs...
Many extensions to the Standard Model, such as an extended Higgs sector, predict new particles decaying into two bosons (W, Z, gamma, H) making these important signatures in the search for new physics. Searches for such diboson resonances have been performed in final states with different numbers of leptons, photons and jets and b-jets where new jet substructure techniques to disentangle the...
The CMS detector explores a wide range of non-standard signatures including displaced and delayed particles, which allow to explore various beyond standard models and set limits of different exotic particles. Results based on data recorded in proton-proton collisions at sqrt(s) = 13 TeV will be reviewed.
Many theories of beyond the Standard Model (BSM) physics predict unique signatures which are difficult to reconstruct and the background rates are also a challenge. Signatures from displaced vertices anywhere from the inner detector to the muon spectrometer as well as those of new particles with fractional or multiple value of the charge of the electron or high mass stable charged particles...
Anomalies in B-meson decays reported by the LHCb experiment could be explained by introducing a heavy neutral gauge boson Z' that dominantly couples to third generation quarks and second generation leptons. While the sensitivities of inclusive searches for such models are strong in heavy Z' regions (>500 GeV), the low-mass region sensitivity is degraded by large SM background (mostly Drell-Yan...
I will provide a general overview of the collider phenomenology of spin 0 or 1/2 mediators with non-trivial gauge numbers under both the Standard Model and a single new confining group. Due to the possibility of many unconventional signatures, the focus is on direct production with semivisible jets. For the mediators to be able to decay, a global U(1) symmetry must be broken. This is best done...
The clockwork mechanism is an elegant framework to generate exponential hierarchies in a theory with only $O(1)$ numbers to start with. I will present some of the recent theoretical and phenomenological developments, first introducing the mechanism by using dark matter as an example of clockwork model building, then discussing the robustness of the clockwork solution to the hierachy problem...
In this talk I present a model with an enlarged color sector which solves the strong CP problem via new massless fermions. QCD color is unified with another non-Abelian group with a large confinement scale. The spontaneous breaking of the unified color group provides a source of naturally large axion mass due to small size instantons, and as a result no very light axions are present in the...
The Peccei-Quinn (PQ) solution to the strong CP problem requires an anomalous global U(1) symmetry, the PQ symmetry. The origin of such a convenient global symmetry is quite puzzling from the theoretical point of view in many aspects. In this talk, we propose a simple prescription which provides an origin of the PQ symmetry. There, the global U(1) PQ symmetry is virtually embedded in a gauged...
Apart from the nonvanishing neutrino masses, state of the art experimental results in particle physics do not show direct evidence for Beyond Standard Model scenarios. This leaves us puzzled concerning the relation of the electromagnetic, weak, strong, and eventually of the gravitational interactions. On a theoretical basis, the local (extended) SUSY is considered to be a rather well-founded...
Non-minimal composite Higgs (CH) models, with additional Goldstone
bosons (GB) beside the Higgs, do not only present a solution to the
hierarchy problem but could also shed light on the dark matter (DM)
puzzle. A realization of this scenario was presented in
(arXiv:1707.07685): The symmmetry breaking structure is SO(7)/SO(6) and
the DM is a complex GB, stabilized by an exact U(1). The...
