Conveners
Electroweak Physics and Beyond the Standard Model: Day2-morning-1
- Nansi Andari (CEA Saclay)
- Sonny Mantry (University of North Georgia)
- Aram Apyan (Fermi National Accelerator Laboratory)
Electroweak Physics and Beyond the Standard Model: Day2-morning-2
- Sonny Mantry (University of North Georgia)
- Aram Apyan (Fermi National Accelerator Laboratory)
- Nansi Andari (CEA Saclay)
Electroweak Physics and Beyond the Standard Model: Day2-afternoon-1
- Sonny Mantry (University of North Georgia)
- Aram Apyan (Fermi National Accelerator Laboratory)
- Nansi Andari (CEA Saclay)
Electroweak Physics and Beyond the Standard Model: Day2-afternoon-2
- There are no conveners in this block
Electroweak Physics and Beyond the Standard Model: Day3-morning-1
- There are no conveners in this block
Electroweak Physics and Beyond the Standard Model: Day3-morning-2
- There are no conveners in this block
Electroweak Physics and Beyond the Standard Model: Day3-afternoon-1
- There are no conveners in this block
Electroweak Physics and Beyond the Standard Model: Day3-afternoon-2
- There are no conveners in this block
Electroweak Physics and Beyond the Standard Model: Day4-morning-1
- There are no conveners in this block
With the pp collision dataset collected at 13 TeV, detailed measurements of Higgs boson properties can be performed. This talk presents measurements of Higgs boson properties using Higgs boson decays to two photons, two Z bosons, and two W bosons, including production mode cross sections and simplified template cross sections.
We present recent results on the analysis of Higgs to WW decays and the corresponding constraints on the Higgs couplings. Focus is concentrated on the recent differential analysis of the Higgs boson transverse momentum and associated production of hadronic jets exploiting the full Run 2 statistics. Recent constraints on new physics models derived from high mass searches in the WW channel are...
The measurement of Higgs boson production in association with a ttbar pair is essential to understand the top-quark couplings to the Higgs boson. This talk presents the analyses using Higgs boson decays to bbbar pairs, to two Z bosons, to other multi-lepton final states, and to a pair of photons, using pp collision data collected at 13 TeV.
Precise measurements of the Higgs boson Yukawa couplings are important tests of the Standard Model of particle physics. In this talk, the most recent results of the analyses performed by the CMS experiment studying Higgs boson decays to fermions will be presented.
Apart from a few anomalies, the majority of measurements at the LHC have been consistent with the Standard Model (SM). Searches of new physics signals beyond LHC energies is now being realized by studying available data with an effective field theory framework. In this talk, I present the results from a combined analysis of top quark and Higgs production measurements at the LHC using SM...
The most precise measurements of Higgs boson cross sections, using the framework of simplified template cross sections, are obtained from a combination of the measurements performed in the different Higgs boson decay channels. This talk presents the combined measurements, as well as their interpretation.
The Higgs boson pair production via gluon fusion at high-energy hadron colliders, such as the LHC, is vital in deciphering the Higgs potential and in pinning down the electroweak symmetry breaking mechanism. In this talk, I will present the NNNLO QCD calculations in the infinite top-quark mass limit and predictions for both the inclusive and differential cross-sections. At the inclusive...
The most precise measurements of Higgs boson single and double Higgs production cross sections are obtained from a combination of measurements performed in different Higgs boson production and decay channels. While double Higgs production can be used to directly constrain the Higgs boson self-coupling, the latter can be also constrained by exploiting higher-order electroweak corrections to...
Top quark production can probe physics beyond the SM in different ways. The Effective Field Theory (EFT) framework allows searching for BSM effects in a model independent way. CMS experiment is pioneering EFT measurements that move towards using full potential of the data in the most global way possible. Searches for flavour-changing neutral currents (FCNC) and anomalous top quark interactions...
Most hard scattering processes at the LHC lead to breakup of the proton because of the single-parton exchange of the proton. However, since the proton is an electrically charged object, quasireal photon-exchange interactions can also take place. Since photons are color-singlet, sometimes the protons remain intact after the interaction, and these can be detected with forward proton detectors...
Recent multiboson results at CMS are presented.
Measurements of electroweak boson pair production at the LHC constitute a stringent test of the electroweak sector and provide a model-independent means to search for new physics at the TeV scale. In this talk, we present recent results from the ATLAS experiment for WW, ZZ and Z𝛾 production in proton-proton collisions at √s=13 TeV. The measurements in each channel exploit the leptonic decays...
We present prospects for the direct measurement of ratios of differential cross sections for the production of Z and Higgs bosons in proton-proton collisions, using data taken by CMS during the LHC Run II. The aim of the study is to investigate soft and hard gluon emission in the initial state for Higgs and Z production mechanisms. Hence, we focus on variables known to be sensitive to the...
Latest results about searches for new resonances with the CMS experiment will be presented. Prospects for Run III and beyond will be also discussed.
Many extensions to the Standard Model predicts new particles decaying into two bosons (W, Z, photon, or Higgs bosons) 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 hadronic decay...
Many theories beyond the Standard Model (BSM) predict new
phenomena at the highest energies accessible by the LHC. These often give rise to heavy resonances consisting of either isolated high-pt leptons or pairs of jets, either exclusively or in conjunction with other objects. Alternatively, should new physics be beyond the scale of the LHC, non-resonant signatures in these final states can...
Since the discovery of the Higgs boson with the mass of about 125 GeV much effort has been spent looking for further scalars, which are motivated in many scenarios. Here we report on searches for new neutral heavy Higgs bosons decaying to pairs of third generation fermions: tau leptons or b quarks. These searches are based on full Run2 data of the ATLAS experiment at the LHC.
Experimental measurements of Drell-Yan (DY) vector-boson production
are available from the Large Hadron Collider (LHC) and from lower-energy collider and fixed-target experiments. In the low transverse momentum end of DY spectra, important for the extraction of the $W$-boson mass at the LHC, QCD contributions from non-perturbative Sudakov form factors and intrinsic transverse momentum become...
Precision measurements of the production cross-sections of W/Z boson at LHC provide important tests of perturbative QCD and information about the parton distribution functions for quarks within the proton. We present measurements of fiducial integrated and differential cross sections for inclusive W+, W− and Z boson production using data collected by the ATLAS experiment at center-of-mass...
The study of the associated production of vector bosons and jets constitutes an excellent testbench to check numerous QCD predictions. Total and differential cross sections of vector bosons produced in association with jets have been studied in pp collisions at 7, 8 and 13 TeV center-of-mass energies. Differential distributions as function of a broad range of kinematical observables are...
In this talk, I am going to introduce our recent works about TMD factorization and resummation for Z boson tagged jets production at the LHC, which can be used to study the proton TMD structure and QCD factorization violation effects. We investigated jet production with the standard jet axis and also the winner-take-all axis. In the first case, we derived an all-order factorization formula,...
The span of uncertainties of the PDFs obtained in a global analysis depends on criteria for selection of acceptable PDF fits. I review several such criteria for estimating the goodness of fit in a large-scale analysis such as CT18, where they are applied in addition to the commonly used value of the global log-likelihood. On the example of CT18(Z) predictions for electroweak precision...
The transverse momentum spectrum of low mass Drell-Yan (DY) production at low
center-of-mass energies $\sqrt{s}$ is calculated by applying transverse momentum
dependent (TMD) parton distributions obtained from the Parton Branching (PB)
evolution method, combined with the next-to-leading-order (NLO) calculation of
the hard process in the MCatNLO method. We compare our predictions with...
I will present the program “reSolve”, a publicly available tool for calculating the resummed contributions to transverse momentum and other spectra. It makes use of the Catani-de Florian- Grazzini resummation formalism in impact parameter space and Mellin space and exploits its largely process-independent nature to be general purpose, applying to any final state excluding coloured particles....
Precision physics calculation are now slowly becoming a standard in Monte Carlo event generation. In particular now, many MC generators allow the possibility to automatically include higher order EW-corrections on top of the usual QCD ones. Nevertheless these corrections can become quite computationally intensive, in particular for many-particles final states (or processes where one includes...
The associated production of top quarks with neutral bosons is measurable in 13 TeV pp LHC collisions thanks to the unprecedented accumulated luminosity. It directly probes top quark couplings to photons and Z bosons and tests for deviations from the standard model.Three measurements are presented. The cross sections for the production of top quark pairs in association to a photon (ttgamma) or...
We study the production of a single top quark in association with a heavy extra Z' at hadron colliders in new physics models with and without flavor-changing neutral-current(FCNC) couplings. We use QCD soft-gluon resummation and threshold expansions to calculate higher-order corrections for the total cross section and transverse-momentum distributions for tZ' production. The impact of the...
In preparation for the era of the High-Luminosity LHC, it will be crucial to enhance the precision of theoretical predictions for BSM-sensitive observables in the electroweak and Higgs sectors. In many cases, such as the extraction of the $W$-boson mass, contemporary PDF uncertainties are a dominant limitation in the quest to achieve the necessary precision. In this talk, I will review this...
Possible electroweak and beyond the Standard Model searches at the future Electron-Ion Collider will be discussed. Measurements of the charged current reactions, parity violating asymmetries, as well as possible searches for e-tau charged lepton flavor violation will be reviewed. This talk will discuss importance of the beam polarization, high luminosity and benefits of the positron beam.
In ultra-relativistic heavy-ion collisions, one expects copious rates of γγ processes through the interaction of the large electromagnetic fields of the nuclei, which can produce new particles (e.g. leptons) or even lead to light-by-light scattering via loop diagrams. The latter process is a notable prediction of QED and was only recently observed by ATLAS using the full 2018 dataset. In...
Latest results from the NA62 experiment at CERN.
The NA62 experiment at the CERN SPS is designed to measure the branching ratio of the K+→π+vv ̅ decay, one of the best candidates to reveal indirect effects of new physics at the highest mass scales with a very precisely predicted branching ratio of less than 10-10.
NA62 took data in 2016-2018.
Data statistics collected in 2016 allowed...
Latest results about searches for long-lived particles with the CMS experiments will be presented. Prospects for Run III and beyond will also be discussed.
Various theories beyond the Standard Model predict unique signatures which are difficult to reconstruct and for which estimating the background rates is also a challenge. Signatures from displaced decays anywhere from the inner detector to the muon spectrometer, as well as those of new particles with fractional or multiple values of the charge of the electron or high mass stable charged...
Rare and exotic decays of the Higgs boson provide a unique
window for the discovery of new physics, as the Higgs boson may couple to leptons in flavour violating or otherwise anomalous ways, or to hidden-sector states that do not interact under the Standard Model gauge transformations. This talk summarizes recent ATLAS searches for unexpected decays of the 125 GeV Higgs boson: enhanced...
The presence of a non-baryonic dark matter (DM) component in the Universe is inferred from the observation of its gravitational interaction. If dark matter interacts weakly with the Standard Model (SM) it could be produced at the LHC. The ATLAS experiment has developed a broad search program for DM candidates, including resonance searches for the mediator which would couple DM to the SM. The...
The tremendous phenomenological success of the Standard Model (SM) suggests that its flavor structure and gauge interactions may not be arbitrary but should have a fundamental first-principle explanation. In this work, we explore how the basic distinctive properties of the SM dynamically emerge from a unified New Physics framework tying together both flavour physics and Grand Unified Theory...
Most recent results on searches for supersymmetric (SUSY) particles decaying to final states containing high energy photon(s) are presented. The searches are based on data collected at the center-of-mass energy of 13 TeV in proton-proton collisions recorded by the CMS detector. Photons may arise directly from a decay of a SUSY particle or due to the decay of a Higgs boson created in the SUSY...
Many theories beyond the Standard Model predict new phenomena, such as Z’ and leptoquarks, in final states containing bottom or top quarks. Such final states offer great potential to reduce the Standard Model background, although with significant challenges in reconstructing and identifying the decay products and modelling the remaining background. The recent 13 TeV pp results, along with...
Supersymmetry (SUSY) provides elegant solutions to several
problems in the Standard Model, and searches for SUSY particles are an important component of the LHC physics program. This talk will present the latest results from searches conducted by the ATLAS experiment, covering both strong and electroweak SUSY particle production processes. The searches target multiple final states and...
