Conveners
Higgs Physics
- Karsten Köneke (Universität Freiburg)
- Sylvie Braibant (Istituto Nazionale di Fisica Nucleare)
Higgs Physics
- María Cepeda (CIEMAT)
- Yuji Enari (ICEPP, the University of Tokyo)
Higgs Physics
- Karsten Köneke (Universität Freiburg)
- María Cepeda (CIEMAT)
Higgs Physics
- Sylvie Braibant (Istituto Nazionale di Fisica Nucleare)
- Fabio Maltoni (Istituto Nazionale di Fisica Nucleare)
Higgs Physics: Joint session with BSM
- Yuji Enari (ICEPP, the University of Tokyo)
- John Conway (University of California, Davis)
Higgs Physics
- Karsten Köneke (Universität Freiburg)
- María Cepeda (CIEMAT)
Higgs Physics
- Yuji Enari (ICEPP, the University of Tokyo)
- Sylvie Braibant (Istituto Nazionale di Fisica Nucleare)
Higgs Physics
- Fabio Maltoni (Istituto Nazionale di Fisica Nucleare)
- Karsten Köneke (Universität Freiburg)
Very detailed measurements of Higgs boson properties and its interactions can be performed with the full Run 2 pp collision dataset collected at 13 TeV by using its decays into bosons, shining light over the electroweak symmetry breaking mechanism. This talk presents the latest measurements of the Higgs boson coupling properties by the ATLAS experiment in various bosonic decay channels, e....
Thanks to the statistics of pp collision collected by the ATLAS experiment a 13 TeV a the LHC Run 2, detailed measurements of Higgs boson properties and its interactions can be performed using its decays into fermions, shining light over the properties of the Yukawa interactions. This talk presents the latest measurements of the Higgs boson properties by the ATLAS experiment in various...
This talk will cover measurements of Higgs boson differential cross section measurements with fermionic decay channels and in ttH production, including fiducial differential cross-sections and STXS results.
This talk will cover measurements of Higgs boson differential cross section measurements with boson decay channels, including fiducial differential cross-sections and STXS results.
With the pp collision dataset collected at 13 TeV, detailed measurements of Higgs boson properties can be performed. The Higgs kinematic properties can be measured with increasing granularity, and interpreted to constrain beyond-the-Standard-Model phenomena. This talk presents the measurements of the Higgs boson fiducial and differential cross sections exploiting the Higgs decays into bosons,...
The discovery of the Higgs boson ten years ago and successful measurement of the Higgs boson couplings to third generation fermions by ATLAS and CMS mark great milestones for HEP. The much weaker coupling to the second generation quarks predicted by the SM makes the measurement of the Higgs-charm coupling much more challenging. With the full run-2 data collected by the CMS experiment, a lot of...
With the full Run2 pp collision dataset collected at 13 TeV, the interactions of Higgs boson to third generation fermion have been established. For the understanding of Yukawa interaction mechanism, it is crucial to establish the interactions to second generation fermions. This talk presents the latest searches for the Higgs boson decays into second generation fermions, as well as for other...
We discuss measurements of the CP properties of the Higgs boson with the CMS detector, both exploiting Higgs boson production and its decay, as well as searches for non-standard-model CP contributions, and anomalous couplings in general.
Studies of the CP properties of the Higgs boson in various production modes and decay channels are presented. Limits on the mixing of CP-even and CP-odd Higgs states are set by exploiting the properties of diverse final states.
This talk presents the most recent measurements of Higgs boson mass and width by the ATLAS experiment exploiting the Higgs boson decays into two photons or four leptons, and using the full Run 2 dataset of pp collisions collected at 13 TeV at the LHC.
With the data collected in Run-2, the Higgs boson can be studied in several production processes using a wide range of decay modes. Combining data in these different channels provides a broad picture of the Higgs boson coupling strengths to SM particles. This talk will cover the latest combination of Higgs boson production and decay modes at CMS to measure the Higgs boson couplings.
With the full Run 2 pp collision dataset collected at 13 TeV, very detailed measurements of Higgs boson coupling properties can be performed using a variety of final states, identifying several production modes and its decays into bosons and fermions and probing different regions of the phase space with increasing precision. These measurements can then be combined to exploit the strengths of...
With the full Run 2 pp collision dataset collected at 13 TeV by the ATLAS experiment, it is now possible to perform detailed measurements of Higgs boson properties in many production and decay modes. In many cases, novel experimental techniques were developed to allow for these measurements. This talk presents a review of a representative selection of such novel techniques, including:...
We assess the performance of different jet-clustering algorithms, in the presence of different resolution parameters and reconstruction procedures, in resolving fully hadronic final states emerging from the chain decay of the discovered Higgs boson into pairs of new identical Higgs states, the latter in turn decaying into bottom-antibottom quark pairs. We show that, at the Large Hadron...
This talk will cover the latest searches for non resonant double Higgs boson production at CMS and interpretations in terms of the Higgs self-coupling. The talk will include the latest combination(s) of HH search channels.
The measurement of pair-production of Higgs bosons is one of the key goals of the LHC. Also, beyond the standard model theories involving extra spatial dimensions predict resonances with large branching fractions in a pair of Higgs bosons with negligible branching fractions to light fermions. We present an overview of searches for resonant and nonresonant Higgs boson pair production at high...
In the Standard Model, the ground state of the Higgs field is not found at zero but instead corresponds to one of the degenerate solutions minimising the Higgs potential. In turn, this spontaneous electroweak symmetry breaking provides a mechanism for the mass generation of nearly all fundamental particles. The Standard Model makes a definite prediction for the Higgs boson self-coupling and...
The most precise measurements of single and double Higgs boson 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, this parameter can be also constrained by exploiting higher-order electroweak corrections to...
Recent HL-LHC studies that were performed by CMS within Snowmass activities are presented. Updates cover different physics topics from Higgs and SM processes.
The large dataset of about 3 $\rm ab^{-1}$ that will be collected at the High Luminosity LHC (HL-LHC) will be used to measure Higgs boson processes in detail. Studies based on current analyses have been carried out to understand the expected precision and limitations of these measurements. The large dataset will also allow for better sensitivity to di-Higgs processes and the Higgs boson self...
We study the Higgs boson decays h -> c cbar, b bbar, b sbar, photon photon
and gluon gluon in the Minimal Supersymmetric Standard Model (MSSM) with
general quark flavor violation (QFV), identifying the h with the Higgs boson
with a mass of 125 GeV. We compute the widths of the h decays to c cbar,
b bbar, b sbar (s bbar) at full one-loop level in the MSSM with QFV.
For the h decays to...
In the absence of direct observations of physics beyond the Standard Model (BSM) at the LHC, the interpretation of Standard Model measurements in the framework of an Effective Field Theory (EFT) represents the most powerful tool to identify BSM phenomena in tiny deviations from the measurement from the SM predictions, to interpret them in term of generic new interactions, or to place...
While the Higgs boson with 125 GeV was found in 2012, the Higgs sector remains unknown.
In various new physics models, the Higgs sector is often extended from its minimal form in the standard model (SM), and there are additional Higgs bosons.
Therefore, the discovery of additional Higgs bosons is clear evidence of the extended Higgs models, and the direct search of these particles is the key...
The first-order electroweak phase transition (FOEWPT) plays an important role in the scenario of electroweak baryogenesis. In this talk, we discuss the first-order phase transitions in a new effective field theory. We show that the SMEFT is not appropriate when we discuss the FOEWPT. We also show that the parameter regions satisfying the sphaleron decoupling condition can be searched at future...
The Standard Model effective field theory (SMEFT) provides a general framework
to include the effects of the beyond standard model physics residing at a certain higher energy scale $\Lambda$. We focus on the modification of top-quark Yukawa coupling, which is one of the important avenues to study EWSB. With this motivation, we consider the production of the tHq process at the LHC. In this...
We have evaluated baryon asymmetry produced by electroweak baryogenesis in aligned two Higgs doublet model, in which Yukawa interactions are aligned to avoid dangerous flavor changing neutral currents, and coupling constants of the lightest Higgs boson with the mass 125 GeV coincide with those in the standard model at tree level to satisfy the current LHC data [1]. In this model, the severe...
We present searches for additional neutral and charged Higgs boson with the CMS detector using the full run 2 dataset. The presented searches also include decays of heavy Higgs bosons into other Higgs bosons (both the 125 GeV Higgs boson and other additional Higgs bosons).
We present searches for rare and beyond-the-standard-model decays of the Higgs boson with the CMS detector using the full run 2 dataset. Amongst others, Higgs boson decays to two (pseudo-) scalars and to invisible particles are discussed.
Precision studies of the properties of the Higgs and gauge bosons may provide a unique window for the discovery of new physics at the LHC. New phenomena can in particular be revealed in the search for lepton-flavor-violating or exotic decays of the Higgs and Z bosons, as well as in their possible couplings to hidden-sector states that do not interact under Standard Model gauge transformations....
The discovery of the Higgs boson with the mass of about 125 GeV completed the particle content predicted by the Standard Model. Even though this model is well established and consistent with many measurements, it is not capable to solely explain some observations. Many extensions of the Standard Model addressing such shortcomings introduce additional charged and neutral Higgs-like bosons. The...
In 2018 CMS reported an excess in the light Higgs-boson search in the diphoton decay mode at about 95GeV based on Run 1 and first year Run 2 data. The combined local significance of the excess was $2.8\,\sigma$. The excess is compatible with the limits obtained in the ATLAS searches from the diphoton search channel. Recently, CMS reported another local excess with a significance of...
Motivated by results recently reported by the CMS Collaboration about an excess in the di-photon spectrum at about 96 GeV, especially when combined with another long-standing anomaly at the same value in the $b\bar b$ invariant mass spectrum in four-jet events collected at LEP, we show that a possible explanation to both phenomena can be found at 1$\sigma$ level in a generic 2-Higgs Doublet...
The extension of the Standard Model (SM) with two Higgs triplets offers an appealing way to account for both tiny Majorana neutrino masses via the type-II seesaw mechanism and the cosmological matter-antimatter asymmetry via the triplet leptogenesis. In this paper, we classify all possible accidental symmetries in the scalar potential of the two-Higgs-triplet model (2HTM). Based on the...
We present a reinterpretation study of existing results from the CMS Collaboration, specifically, searches for light BSM Higgs pairs produced in the chain decay $pp\to H_{\rm SM}\to hh(AA)$ into a variety of final states, in the context of the CP-conserving 2-Higgs Doublet Model (2HDM) Type-I. Through this, we test the LHC sensitivity to a possible new signature, $pp\to H_{SM}\to ZA\to ZZ h$,...
In this talk, I will present several possible anomaly-free implementations of the Branco-Grimus-Lavoura (BGL) model with two Higgs doublets and one singlet scalar. The model also includes three generations of massive neutrinos that get their mass via a type-I seesaw mechanism. A particular anomaly-free realization, which we dub νBGL-1 scenario, is subjected to a complete analysis, where valid...
With the discovery of the Higgs boson at the CERN Large Hadron Collider (LHC), the particle spectrum of the Standard Model (SM) is complete. The next target at the energy frontier will be to study the Higgs properties and to search for the next scale beyond the SM. Experimentally, the $H\to c \bar{c}$ channel would be extremely difficult to dig out because of both the weak Yukawa coupling and...
In the quest for new physics (NP), due to the lack of any direct evidence, the framework of Effective field theory (EFT) becomes an indirect and consistent way to parametrise NP effects in terms of higher dimension operators. Among the observables with the potential to account for NP signatures, Electroweak Precision Observables (EWPO) and those from Higgs productions and decays play an...
In this presentation, I discuss collider signatures with a focus on new physics scenarios that are predicted in various classes of multi-Higgs doublet models. A thorough analysis of one of these signatures is conducted in the context of the Large Hadron collider, based on a topology with two charged leptons and 4 jets arising from first/second generation chiral quarks. I discuss how the...
The FCC-ee offers powerful opportunities to determine the Higgs boson parameters, exploiting over $10^{6}$ e+e- → ZH events and almost $10^{5}$ WW→H events at centre-of-mass energies around 240 and 365 GeV. This contribution spotlights the important measurements of the ZH production cross section and of the Higgs boson mass. The measurement of the total ZH cross section is an essential input...
The Future Circular Collider (FCC) is at the heart of the vision of the EU Strategy for Particle Physics, and the highest priority for Europe and its international partners. A technical and financial feasibility study of the 100-km infrastructure and of the colliders that would be installed in it is underway. The physics programme is based on the sequence of a 90-400 GeV high-luminosity and...
Higgs production cross sections at LHeC (FCC-he) energies are as large (larger than) those at future $𝑍−𝐻$ $𝑒^+𝑒^−$ colliders. This provides alternative and complementary ways to obtain very precise measurements of the Higgs couplings, primarily from luminous, charged current DIS. Recent results for LHeC and FCC-he are shown and their combination is presented with $𝑝𝑝$ (HL-LHC) cross sections...
Muon collisions at multi-TeV center of mass energies are ideal for studying Higgs boson properties. At these energies the production rates will allow precise measurements of its couplings to fermions and bosons. In addition the double Higgs boson production rate could be sufficiently high to directly measure the parameters of trilinear self-couplings, giving access to the determination of the...
We explore the sensitivity of directly testing the muon-Higgs coupling at a high-energy muon collider. This is strongly motivated if there exists new physics that is not aligned with the Standard Model Yukawa interactions which are responsible for the fermion mass generation. We illustrate a few such examples for physics beyond the Standard Model. With the accidentally small value of the muon...
At the latest European strategy update in 2020 it has been highlighted that
the next highest-priority collider should be an e+e− Higgs factory with a strong
focus on precision physics. To utilise the clean event environments, a new generation of collider detector technolgies is being developed along with novel algorithms to push event reconstruction to its full potential.
This talk reviews...
With technically mature design and well understood physics program, ILC is realistic option for realization of a Higgs factory. With a unique physics reach of a linear collider, ILC meaningfully complement projections for HL-LHC. Energy staged data collection, employment of beam polarization and capability to reach a TeV center-of-mass energy enable unique precision to probe BSM models above...
In this talk we discuss the results of a full-simulation study exploring CP violation in Higgs production through ZZ fusion. The study is performed for CLIC running at a centre-of-mass energy of 1.4TeV, assuming that the Higgs boson is realized as a mixture of scalar and pseudoscalar states. By measuring the electron and positron in the final state, the CP-violating mixing angle...
I will report on the developments in precision calculations for Higgs physics from its discovery to today, focusing on the latest advancements in the study of its main production channel, gluon fusion.
It has been 10 years since the discovery of the Higgs Boson. A small “bump” around 125 GeV mass spectrum has now evolved into precision measurements of the properties of Higgs Boson. As the second largest Higgs production channel at the LHC, vector boson fusion to Higgs has been studied intensively by both experiment and theory communities. In this talk, I will give a brief overview of the...
One of the most interesting yet-to-be answered questions in Particle Physics is the nature of the Higgs Yukawa couplings and their universality. Key information in our understanding of this question arises from studying the coupling of the Higgs boson to second generation quarks. Some puzzles in the flavor sector and potential additional sources of CP violation could also have their origins in...
The detailed study of the Higgs boson is one of the main tasks of contemporary particle physics. Gluon fusion, the main production channel of Higgs bosons at the LHC, has been successfully modelled in QCD up to $\text{N}^3\text{LO}$. To fully exploit this unprecedent theoretical effort, sub-leading contributions, such as electroweak corrections, must be investigated. I will present the...
In Gildener-Weinberg multi-Higgs models of electroweak symmetry breaking,
the new, Beyond-Standard-Model Higgs bosons are surprisingly light,
$< 600$--$700\,{\rm GeV}$, well within reach of the LHC. There is a
surprising connection between the top quark and Higgs alignment in these
models. Were it not for the top quark and its large mass, the coupling of
the $125\,{\rm GeV}$...
