Conveners
Higgs and new physics: Higgs
- Ivica Puljak (Technical University of Split FESB)
Higgs and new physics: Supersymmetry
- Marie-Helene Genest (LPSC-Grenoble, CNRS/UGA (FR))
Higgs and new physics: Higgs
- Giuseppe Degrassi (Universita e INFN, Roma Tre (IT))
Higgs and new physics: Exotics
- Marie-Helene Genest (LPSC-Grenoble, CNRS/UGA (FR))
Higgs and new physics: Higgs
- Tamara Vazquez Schroeder (McGill University (CA))
- Michael Duehrssen-Debling (CERN)
Higgs and new physics: Future Colliders
- Paolo Meridiani (Universita e INFN, Roma I (IT))
Higgs and new physics: Supersymmetry
- Radovan Dermisek
Higgs and new physics: Long-lived particles
- Marie-Helene Genest (LPSC-Grenoble, CNRS/UGA (FR))
Higgs and new physics: Exotics
- Marie-Helene Genest (LPSC-Grenoble, CNRS/UGA (FR))
- ALEKSANDR AZATOV (INFN - National Institute for Nuclear Physics)
The latest results on the measurement of the Higgs boson couplings and properties in the diphoton, ZZ and WW decay channels with the ATLAS detector are presented, using approximately 36 fb-1 of pp collision data collected at 13 TeV.
The studies on the properties of Higgs boson in H->ZZ->4l (l = e, ฮผ) and H->WW->eฮฝฮผฮฝ decay channels based on the data collected with the CMS experiment in Run2 are presented. The reported results include studies of the Higgs boson production modes using H->ZZ and H->WW decay channels, as well as measurements of the Higgs boson mass, signal strength, fiducial differential cross sections for its...
The latest results of the measurement of the Higgs boson decaying into two photons with the full 2016 data will be presented. The analysis is performed using the dataset recorded by the CMS experiment at the LHC from pp collisions at centre-of-mass energies of 13 TeV corresponding to an integrated luminosity of 35.9 1/fb.
One of the fundamental properties of the Higgs boson, it's mass, is measured by way of studying the invariant mass of the 4l and diphoton decay channels with about 36fb-1 of data collected by the ATLAS experiments. Since in this channel the final state can be reconstructed as invariant mass peak with a good experimental resolution this measurement can be done in a model independent way and...
We present an inclusive search for a Higgs boson with high transverse momentum decaying to a bottom-antibottom quark pair in pp collisions using the 2016 data sample corresponding to 35.9fbโ1collected by the CMS experiment at LHC. High pT Higgs bosons candidates are reconstructed in a single jet with opening angle corresponding to R = 0.8 (AK8 jet). Jet substructure and dedicated b-tagging...
We suggest that the exclusive Higgs + light (or b) jet production at the LHC,
$pp \to h+j(j_b)$, is a rather sensitive probe
of the light-quarks Yukawa couplings and of new physics (NP) in the
Higgs-gluon $hgg$ and quark-gluon $qqg$ interactions.
We study the Higgs $p_T$ distribution in $pp \to h+j(j_b)$, employing non-differential observables
to probe the different types of NP relevant for...
The latest results from CMS on the study of SM Higgs decaying to tau pair and search for SM Higgs decaying to bottom quarks will be discussed. These results are based on the analysis of p-p collisions at 13 TeV, collected from CMS in the year 2016.
The latest results on the measurement of the cross sections and couplings of the Higgs boson in the fermionic decay channels to bb, tautau and mumu with the ATLAS detector are presented, using approximately 36 fb-1 of pp collision data collected at 13 TeV.
The results obtained from the different decay channels are combined to study the properties of the Higgs boson production and decay, and test the SM theoretical precision with increased accuracy, using about 36 fb-1 of p-p collisions data collected at 13 TeV.
Recent results on CMS searches for exotic decays of the Higgs boson H(125) will be presented in this talk including searches for invisible and quasi invisible decays, lepton flavour violating ($e\mu$, $e\tau$, $\mu\tau$) decays, and decays to light scalars. The current status of searches for rare decays of standard model Higgs boson will also be summarized.
Some theories predict Lepton Flavour Violating decays of the Higgs boson, while other predict enhanced decay rates in rare modes like Z-photon, J/Psi-photon and Phi-photon or into invisible particles. Such decays are searched for using about 36 fb-1 of p-p collisions at 13 TeV.
Several theories, like the Minimal Supersymmetric Standard Model, predict a high mass neutral Higgs boson with a significant decay rate into the bb, mu-mu or tau-tau final states. The search for a scalar resonance in fermion decay channels is presented, using about 36 fb-1 of p-p collisions at 13 TeV.
A summary of recent progress of MSSM Higgs searches in CMS experiment. And also including Higgs like resonance searches with other BSM models, for example 2HDM, Gravitons, etc.
I present theoretical results for charged Higgs production in association with a W boson or a top quark at the LHC. I calculate higher-order threshold corrections and show that they are very significant. I present detailed results for total cross sections as well as transverse-momentum and rapidity distributions of the Higgs boson for various LHC energies.
The talk provides an overview of the status of SUSY breaking scenarios. The focus will be on the way the electroweak symmetry breaking is achieved and understood in different scenarios. Various aspects of naturalness and its implication will be discussed and compared.
Several theories beyond the Standard Model, like the 2HDM, predict the existence of high mass charged Higgs particles. Such charged Higgs, produced in association with a top quark or in VBF, are searched for in several decay channels, using about 36 fb-1 of p-p collisions at 13 TeV.
We report on searches for new physics in events with one or more jets and missing transverse energy. The searches use proton-proton collision data recorded in 2016 by the CMS experiment at the LHC. The results are interpreted in terms of several simplified models of supersymmetry.
I consider the Standard Model extended by a heavy scalar singlet and derive the low-energy effective theory resulting from integrating out the heavy state. This exercise in effective field theory serves to illustrate with a simple example the systematics of the linear and nonlinear electroweak effective Lagrangians and to clarify the relation between them. I discuss power-counting aspects and...
Despite the absence of experimental evidence, weak scale supersymmetry remains one of the best motivated and studied Standard Model extensions. This talk summarises recent ATLAS results on inclusive searches for supersymmetric squarks and gluinos, including third generation squarks produced in the decay of gluinos. The searches involve final states containing jets, missing transverse momentum...
The talk aims to present the most recent results on heavy scalar search in diboson final states (WW,ZZ) combining different final states using full 2016 data collected by CMS detector.
Several theories beyond the Standard Model, like the EWS or 2HDM models, predict the existence of high mass Higgs particles, which could decay into final states with Weak bosons. In this presentation the latest ATLAS results on these searches will be discussed, using about 36 fb-1 of p-p collisions at 13 TeV.
We report on searches for new physics in events with one or more charged leptons, jets and missing transverse momentum. The searches use proton-proton collision data recorded in 2016 by the CMS experiment at the LHC. The results are interpreted in terms of several simplified models of pair production of supersymmetric partners of gluons or quarks.
We point out that the stringent lower bounds on the masses of additional neutral and charged Higgs bosons crucially depend on the flavour structure of their Yukawa interactions. We show that these bounds can easily be evaded when flavour violation is allowed in the Higgs sector. As an illustration, we study the phenomenology of a two Higgs doublet model with a Yukawa texture arising from...
Despite the absence of experimental evidence, weak scale supersymmetry remains one of the best motivated and studied Standard Model extensions. This talk summarises recent ATLAS results on inclusive searches for supersymmetric squarks and gluinos, including third generation squarks produced in the decay of gluinos. The searches involve final states containing jets, missing transverse momentum...
The Recursive Jigsaw reconstruction technique provides a powerful way to tackle challenging SUSY final states with multiple missing particles. By altering the input "decay tree" we demonstrate a new approach to considering compressed SUSY signatures from a variety of different sources. The imposition of this decay tree provides a clear way to define which objects are associated with an ISR...
In this talk we would like to report on our recent calculations of the mixed QCD-EW corrections to the top- and bottom Yukawa couplings within the Standard Model (SM) and beyond (THDM, MSSM). After a brief review of the SM calculations, we would like to concentrate on the comparison SM/BSM and on the non-decoupling behavior of these corrections that might open a new window to indirect...
Scenarios where multiple SUSY states are nearly degenerate in mass produce soft decay products, and they represent an experimental challenge for ATLAS. This talk presents recent results of analyses explicitly targeting such โcompressedโ scenarios with a variety of experimental techniques. All results make use of proton-proton collisions collected at a centre of mass of 13 TeV with the ATLAS detector.
The Two-Higgs-doublet model (2HDM) is one of the most studied extensions of the Standard Model. But just as the other popular "New Physics" models, it gets more and more constrained by recent experimental progress, especially by the LHC data. For all four 2HDM types with a softly broken $Z_2$ symmetry, we present updated results of global analyses obtained with the open-source HEPfit code. We...
We report on searches for supersymmetry in scenarios where the mass differences between the lightest supersymmetric particles are small, or where their decay chains involve a Higgs boson. The searches use proton-proton collision data recorded in 2016 by the CMS experiment at the LHC. The results are interpreted in terms of several simplified models of supersymmetry.
Taking into account that LCH searches for New Physics are failing, the electroweak effective theory seems to be appropriate to deal with current energies. Tracks of new higher scales can be studied through next-to-leading corrections of the electroweak effective theory. Assuming strongly-coupled scenarios we have considered high-energy Lagrangians which incorporate explicitly new heavy fields....
We present a search for a Higgs-like particle $\phi$ decaying into $b\bar{b}$ produced in association with $b$ quarks in p$\bar{p}$ collisions. The event sample corresponds to 5.4 $\text{fb}^{-1}$ of integrated luminosity collected with the CDF II detector at the Tevatron collider using a single $b$ tagged jet trigger. We search for an enhancement in the mass of the two leading jets in event...
I discuss the feasibility to search for supersymmetry in the decays of heavy Z' bosons, predicted by GUT-inspired U(1)' models, by investigating final states with charged leptons and missing energy in pp collisions at the LHC. I also investigate decays into pairs of the lightest MSSM neutralinos, which are Dark Matter candidates, and update the exclusion limits on the Z' mass, accounting for...
We report on searches for supersymmetric partners of top and bottom quarks. The searches use proton-proton collision data recorded in 2016 by the CMS experiment at the LHC. The results are interpreted under several assumptions for the decay of these particles.
Dark photons $\bar{ฮณ}$ mediating long-range forces in a dark sector are predicted by various new physics scenarios, and are being intensively searched for in experiments. Thanks to the non-decoupling properties of the Higgs boson, BR values of Higgs decaying into a photon plus darkphoton $H \to\gamma \bar{\gamma}$ up to a few percent are possible for a massless dark photon, even for heavy...
The Higgs physics prospects at the high-luminosity LHC are presented, assuming an energy of sqrt(s) = 14 TeV and a data sample of 3000-4000 fb-1. In particular, the ultimate precision attainable on the couplings measurements of the 125 GeV Higgs boson with SM fermions and bosons is discussed, as well as perspectives on the search for the Standard Model di-Higgs production, which could lead to...
Naturalness arguments for weak-scale supersymmetry favour supersymmetric partners of the third generation quarks with masses not too far from those of their Standard Model counterparts. Top or bottom squarks with masses less than or around one TeV can also give rise to direct pair production rates at the LHC that can be observed in the data sample recorded by the ATLAS detector. The talk...
We present the performance of Higgs boson property measurements and BSM Higgs searches using the CMS detector in the High-Luminosity LHC conditions, with an integrated luminosity of up to 3000 fb-1. Projections of 13 TeV analyses and 14 TeV simulation studies are both shown.
Naturalness arguments for weak-scale supersymmetry favour supersymmetric partners of the third generation quarks with masses not too far from those of their Standard Model counterparts. Top or bottom squarks with masses less than or around one TeV can also give rise to direct pair production rates at the LHC that can be observed in the data sample recorded by the ATLAS detector. The talk...
The discovery of the 125 GeV Higgs boson, which was the last missing element of the standard model (SM), provided us the insight that the electroweak symmetry breaking is done by a Higgs condensate in the vacuum, namely the Higgs mechanism. However the SM does not give the dynamics explaining why and how that Higgs condensate is formed. On the other hand, the SM can not provide candidate...
We present a threshold resummation calculation for the associated production of gluinos and gauginos at the LHC to the next-to-leading logarithmic accuracy. Analytical results are presented for the process-dependent soft anomalous dimension and the hard function. The resummed results are matched to a full next-to-leading order calculation, for which we have generalised the previously known...
I will explain various EFT approaches to learn about possible new physics lying beyond the SM. Particular emphasis will be put on EWSB physics and operators that break EW symmetry beyond the SM.
The strong nature of Composite Higgs models manifests at high energies through the growing behavior of the scattering amplitudes of longitudinally polarized weak bosons that leads to the formation of composite resonances as well as non resonant strong effects. In this work, the unitarity of these scattering amplitudes, computed on the framework of chiral perturbation theory, is used as tool to...
During the last two years the LHC produced pp collisions at the record center-of-mass energy of 13 TeV. The sensitivity of searches for new phenomena with a high mass scale greatly benefited from the energy increase with respect to the LHC run-1 data. Events with two hadronic jets in the final state are of particular interest: new phenomena produced in parton collisions are likely to produce...
After the discovery of a Higgs boson, it is of great importance to study its properties under a minimal set of assumptions. The definition of a fiducial phase-space for the measurement of cross sections allows to minimise uncertainties due to extrapolations and to model dependence. A measurement of the Higgs boson differential fiducial cross sections is performed in several final states,...
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 multijet events, as well as searches for RPV SUSY in events with paired dijets. This talk focuses on the recent...
The latest results on the measurement of the fiducial and differential cross sections of the Higgs boson in the diphoton and 4l decay channels with the ATLAS detector are presented, using approximately 36 fb-1 of pp collision data collected at 13 TeV.
The high-precision HERA data are used to search for Beyond the Standard Model contributions to electron-quark scattering in the framework of eeqq contact interactions (CI). Combined measurements of the inclusive deep inelastic cross sections in neutral and charged current $ep$ scattering are considered, corresponding to a luminosity of around 1 fb$^{-1}$. The analysis of the inclusive $ep$...
We study the effects of dimension-six operators on the Higgs decay into
four lepton channel. The calculation of new matrix elements has been
performed in the so-called Higgs basis and it is
implemented in a Monte Carlo event generator.
A mapping between the parameters of the phenomenological Lagrangian
and those of the Warsaw and SILH bases is also implemented.
We consider all the relevant...
A flexible trigger system, excellent vertex locator, invariant mass resolution and forward acceptance allow unique exotica measurements to be performed at LHC energies using data collected with the LHCb detector. A summary of results will be presented, focusing in searches involving low mass dimuon resonances, sensitive to a wide range of New Physics models.
The production of a pair of Higgs bosons provides a direct handle on the structure of the Higgs field potential. While the HH production within the SM is very small and essentially out of the experimental reach within the LHC Run II, several beyond SM theories foresee an enhancement that can be already probed with the available data. The latest searches for resonant and non-resonant Higgs pair...
Many new physics models, e.g., compositeness, see-saw, and extra dimensions models, are expected to manifest themselves in the final states with leptons and photons. This talk presents searches for new non-resonant phenomena in the final states that include leptons and photons, focusing on the recent results obtained using data collected during the 2016 run.
An enhanced production of two Higgs bosons would be a clear sign of beyond Standard Model physics. A search is performed for resonant and non-resonant excess production, including several decay channels of the two Higgs bosons. The analysis uses about 36 fb-1 of p-p collisions at 13 TeV.
Many theories beyond the Standard Model predict new phenomena which decay to well isolated, high-pt leptons. 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 in 2015 and 2016 by the ATLAS detector at the LHC with a centre-of-mass energy of 13 TeV.
In the Standard Model of the Electroweak Interactions the value of the
Higgs trilinear self-coupling is predicted from its relation to the
Higgs mass and the Fermi constant. However, the experimental
verification of this prediction through the measurement of the double
Higgs production is extremely challenging.
I present the possibility of probing an anomalous trilinear coupling
indirectly,...
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 leptons and photons. This talk presents CMS searches for new resonances in the dilepton, lepton+MET, diphoton, and other final states that include leptons and photons, focusing on the recent results obtained using data...
Recent results on the resummation of soft gluon corrections to the $pp \rightarrow t \bar{t} H$ cross section at the LHC will be presented. The resummation was carried out at next-to-next-to-leading-logarithmic (NNLL) accuracy using the Mellin space technique and matched to the NLO cross section. The process probes directly the top-Higgs Yukawa coupling that may be particularly sensitive to...
In composite Higgs models, new composite pseudo-scalars (as an $\eta$ or an $\eta^{\prime}$-like state) can interact with the Higgs and with gauge bosons via anomalous interactions, which stem from the topological structure of the theory. A future 100 TeV pp collider (FCC) will be able to test these anomalous interactions and thus to shed light on the strong dynamics which generates the Higgs...
Latest 13 TeV results of CMS searches regarding the Higgs boson production in association with top quarks will be presented. This talk will cover the different CMS analyses covering the main Higgs boson decay modes (gamma gamma, ZZ, WW, and tautau).
New Physics searches at colliders are usually conceived as the search of excesses in the number of events at a certain kinematic region. We emphasize that, whenever the process under study is mediated by a non-scalar particle, the final-state angular distribution has extra information related to the spin state of the mediator. We apply this
idea to the W and Z bosons at LHC, showing that...
Due to the gap between the known 100 GeV scale and new physics if any, it is natural to employ an effective one-loop Lagrangian (HEFT) for the particles of the Electroweak Symmetry Breaking Sector (WL,ZL and h). To describe any new particles and resonances that may be found at the LHC we employ its unitarized amplitudes, valid even in the presence of new strong interactions. We have assessed...
The associated production of the Higgs boson with top quarks should allow the direct observation of the coupling of the Higgs boson to top quarks. The channel also benefits for a large cross-section increase between 8 and 13 TeV. ATLAS results in the search for the Higgs boson in the ttH production mode based on about 36fb-1 collected data will be presented.
Latest 13 TeV results of CMS searches for the Higgs boson produced in association with top quarks and decaying to b quarks will be presented. This talk will include the first CMS results for the fully hadronic channel with the matrix element method as well as the semi-leptonic and di-leptonic channels with the matrix element method and BDT discriminant.
Torsion models constitute a well known class of extended quantum gravity models. In this work, one investigates phenomenological consequences of a torsion field interacting in different ways with top quarks at LHC. A torsion field could appear as a new heavy state characterized by its mass and couplings to fermions. This new state would form a resonance decaying into a top anti-top pair. ...
The high precision HERA combined measurement of inclusive deep inelastic cross sections in neutral and charged current $ep$ scattering, corresponding to a luminosity of about 1 fb$^{-1}$, permits searches for new contributions to electron-quark scattering beyond the Standard Model up to TeV scales. A new approach to beyond the Standard Model analysis of the inclusive ep data is presented;...
The latest results of searches for the Standard Model Higgs boson produced in association with a single top quark (tHq, tHW) are presented. The analyses have been performed using the 13 TeV pp collisions data recorded by the CMS experiment in 2015 and 2016.
The Large Hadron-electron Collider LHeC and the Future Circular Collider in electron-hadron mode FCC-eh will provide electron-proton collisions with center-of-mass energies in the range 1.3-3.5 TeV and instantaneous luminosities larger than $10^{34}$ cm$^{-2}$s$^{-1}$. An overview is given and new results are presented on a variety of possible discovery channels such as exotic Higgs, RPV SUSY,...
We present the results of a CMS search for a new Higgs boson-like resonance decaying into two photons in proton-proton collisions. We search for an excess of events over the standard model background prediction in the diphoton invariant mass spectrum.
Many supersymmetry models feature gauginos and also sleptons with masses less than a few hundred GeV. These can give rise to direct pair production rates at the LHC that can be observed in the data sample recorded by the ATLAS detector. The talk presents results from searches for gaugino and slepton pair production in final states with leptons, and were performed with pp collisions at a...
The LHC did not discover new particles beyond the Standard Model Higgs boson at 7 and 8 TeV, or in the first data samples at 13 TeV. ย ย However, the complementary nature of physics with e+e- collisions still offers many interesting scenarios in which new particles can be discovered at the ILC. ย These scenarios take advantage of the capability of e+e- collisions to observe particles with missing...
The Compact Linear Collider (CLIC) is an option for a future
electron-positron collider operating at centre-of-mass energies from a
few hundred GeV up to 3 TeV. This contribution discusses the Higgs and
BSM physics reach of CLIC operating in several energy stages. The
presented results are based on physics benchmark analyses using full
detector simulations, several of which have been completed...
We report on searches for supersymmetry via pair production of partners of electroweak gauge and Higgs bosons. The searches use proton-proton collision data recorded in 2016 by the CMS experiment at the LHC. The results are interpreted in terms of several simplified models of supersymmetry.
We study the nature of the flavor changing neutral couplings of the top quark with the Higgs boson and the up/charm quark in the ttยฏ production at linear colliders. There are previous bounds on such tqH couplings at both, linear and hadronic colliders, with the assumption that it couples equally to the left and the right handed fermions. In this paper we examine the chirality of the tqH...
We report on searches for new physics in events with at least one photon, jets and missing transverse energy. The searches use proton-proton collision data recorded in 2016 by the CMS experiment at the LHC. The results are interpreted in terms of several simplified models of supersymmetry.
The plan for the International Linear Collider is now being prepared as a staged design, with the first stage at 250 GeV and later stages achieving the full project specifications with 4 ab-1 at 500 GeV. This talk will present the capabilities for precision Higgs boson measurements at 250 GeV and their relation to the full ILC program. It will show that the 250 GeV stage of ILC will...
R-parity violation introduces new signatures to be considered in the search for supersymmetry at the LHC. Strongly interacting resonances may decay to jets, sleptons may decay via lepton-flavour violating processes and lightest supersymmetric particles may decay into many particles with or without missing transverse momentum. The talk presents recent results from searches of supersymmetry in...
I will present the first global fit results for supersymmetric models using the new Global And Modular BSM Inference Tool (GAMBIT). With GAMBIT we have performed fits of the GUT-motivated CMSSM, NUHM1 and NUHM2 models, as well as the weak-scale MSSM7, extending existing results in terms of the number of observables included, scanning techniques and treatment of nuisance parameters.
After the Higgs boson discovery, the precision measurements and searches for new phenomena in the Higgs sector are among the most important goals in particle physics. Experiments at the Future Circular Colliders (FCC) are ideal to study these questions. Electron-positron collisions up to an energy of 350 GeV (FCC-ee) provide the ultimate precision with studies of Higgs boson couplings, mass,...
The Large Hadron-electron Collider LHeC and the Future Circular Collider in electron-hadron mode FCC-eh will provide electron-proton collisions with center-of-mass energies in the range 1.3-3.5 TeV and instantaneous luminosities larger than $10^{34}$ cm$^{-2}$s$^{-1}$. With integrated luminosities of about 1 ab$^{-1}$, they provide large samples of Standard Model Higgs bosons in both neutral...
ATLAS and CMS have performed a large number of searches for physics beyond the Standard Model (BSM). The results of SUSY searches are typically interpreted in the context of Simplified Models. While mass limits obtained in this manner are highly model dependent, cross section upper limits (or efficiency maps) may be used to obtain constraints on generic BSM scenarios without any further event...
In this talk I will give the theory overview for new long-lived particles at the LHC. I will describe some of the motivations including neutral naturalness and dark matter. I will also discuss some particularly spectacular signatures where current searches have limited sensitivity and where a joint experimental and theoretical effort to design new search strategies could result in discovery.
The next to MSSM theory predicts the existence of a light pseudoscalar boson "a", and the decay of the Higgs boson into a pair of such particles. This scheme is searched for in several final states relative to different decay modes of the "a" particle, using about 10 fb-1 of p-p collisions at 13 TeV.
While most BSM searches at the LHC focus on heavy new states, the NMSSM contain the possibility of new light states that have escaped detection due to their singlet nature.
Here we focus on light pseudoscalars, investigating the parameter space impact of recent LHC searches for such light states stemming from the decay of the 125 GeV Higgs boson. It is shown that, though direct searches can...
We present the current perspectives for SUSY at the LHC Run-II and at future colliders in the SU5, mAMSB and in a phenomenological Minimal Supersymmetric Standard Model scenarios with eleven parameters (pMSSM11). Our study includes the most important limits on SUSY coming from searches at runs 1 and 2 of the LHC, as well as the compatibility with the observed Higgs signal and the constraints...
MoEDAL is a pioneering experiment designed to search for highly ionising messengers of new physics such as magnetic monopoles or massive (pseudo-)stable charged particles, that are predicted to existing a plethora of models beyond the Standard Model. It started data taking at the LHC at a centre-of-mass energy of 13 TeV, in 2015. Its ground breaking physics program defines a number of...
Radiatively-driven natural Supersymmetry, a theoretically and experimentally well-motivated framework, centers around the predicted existence of four light, nearly mass-degenerate Higgsinos with mass $\sim 100-200$ GeV (not too far above $m_Z$). Their small mass splittings of at most 20 GeV implies very little visible energy of accompanying Standard Model particles decayed from heavier...
A flexible trigger system, excellent vertex locator, particle identification detectors, and forward acceptance allow unique exotica measurements to be performed at LHC energies using data collected with the LHCb detector. A summary of results will be presented, including searches for long-lived particles decaying into jet pairs or semi-leptonically.
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, and particles giving rise to other non-conventional signatures. We present recent results of searches for long-lived particles and other non-conventional signatures obtained using data recorded by the CMS...
We evaluate the fine-tuning of the phenomenological minimal supersymmetric standard model (pMSSM). We show that the fine-tuning of the pMSSM is not large yet, nor under pressure by LHC searches. We also determine GUT scale models with the same low fine-tuning.
Low sbottom, stop and gluino masses turn out to be less relevant for low fine-tuning than commonly assumed. Fine-tuning arguments point...
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...
We study the muon g-2 and neutralino dark matter as explained by the MSSM where the squarks and 3rd generation sleptons are decoupled. Particularly, we focus on constraints from current and future dark matter experiments such as PandaX-II and LUX-2016 as well as current bounds from collider searches. Using the constraints on the MSSM from the muon g-2 and DM searches, we study constraints from...
We analyze the phenomenological status of several models of BSM physics explaining the muon g-2 anomaly and the relic density of dark matter. We consider scenarios requiring extra vector-like matter, some of which are based on supersymmetry. We confront the models with the latest bounds from the LHC 14 TeV run, direct and indirect searches for dark matter, and precision tests of the...
Fixed target experiments are a particularly useful tool in the search of very weakly coupled particles in the MeV-GeV range, which are of interest, e.g. as potential Dark Matter mediators. The NA62 experiment at the CERN SPS is currently taking data to measure the rare decay $K \to \pi \nu \bar{\nu}$. Owing to the high beam-energy and a hermetic detector coverage, NA62 also has the...
The two Higgs doublet model without any ad hoc symmetries, in general should have extra Yukawa interactions which cause exotic interactions such as flavor changing neutral processes. Effects of the extra Yukawa interactions can also appear in
couplings of the 125 GeV Higgs boson ($h$) via fermion loop contributions. In this talk, we calculate the $hZZ$ coupling expected to be measured with...
SHiP is a new general purpose fixed target facility, whose Technical Proposal has been recently reviewed by the CERN SPS Committee and by the CERN Research Board. The two boards recommended that the experiment proceeds further to a Comprehensive Design phase in the context of the new CERN Working group "Physics Beyond Colliders", aiming at presenting a CERN strategy for the European Strategy...
I will review the current status of the Composite Higgs scenarios. Discussing the advances on both theoretical and experimental sides.
The discovery of a Higgs boson at the Large Hadron Collider (LHC) motivates searches for physics beyond the Standard Model (SM) in channels involving coupling to the Higgs boson. A search for a massive resonance decaying into a standard model Higgs boson (h) and a W or Z boson or two a standard model Higgs bosons is performed. Final states with different number of leptons and where the Higgs...
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 (Wโ, Zโ) and spin 2 (Graviton) particle with large branching fractions in pairs of standard model bosons and negligible branching fractions to light fermions. We present an overview of searches for new physics containing...
New gauge bosons with renormalizable couplings to quarks but not to leptons must interact with additional fermions ("anomalons") required to cancel the gauge anomalies. Analyzing the decays of such leptophobic bosons into anomalons, I show that they produce final states involving leptons at the LHC. Resonant production of a flavor-universal leptophobic Zโฒ boson leads to cascade decays via...
Many extensions to the Standard Model predicts new particles decaying into two bosons (WW, WZ, ZZ, Zgamma) 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 where new jet substructure techniques to disentangle the hadronic decay products in highly boosted...
Many theories describing physics beyond the Standard Model rely on a large separation of scales. Large scale separation arises in models with mass-split flavors if the system is conformal in the ultraviolet but chirally broken in the infrared. Because of the conformal fixed point, these systems exhibit hyperscaling and a highly constrained resonance spectrum. We derive hyperscaling relations...
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 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 Hierarchy problem and stabilize the Higgs mass, while escaping constraints on the Higgs cross section measurement. The...
Searches for new resonances that decay either to pairs of top quarks or a top and a b-quark will be presented. The searches are performed with the ATLAS experiment at the LHC using proton-proton collision data collected in 2015 and 2016 with a centre-of-mass energy of 13 TeV. The invariant mass spectrum of hypothetical resonances are examined for local excesses or deficits that are...
We present a search for new massive particles decaying to heavy-flavour quarks with the CMS detector at the LHC. The prominent signature is the resonant production of top quark pairs. Decay channels to vector-like top partner quarks, such as T', are also considered for the first time. We use proton-proton collision data recorded at a centre-of-mass energy of 13 TeV. The search is performed in...
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 in the 2016 run of the LHC.
Many theories beyond the standard model predict new phenomena which decay to leptons and 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 in 2015 and 2016 by the ATLAS detector at the LHC with a centre-of-mass energy of 13 TeV.
