Conveners
Parallel: Precision and Properties: Live discussion session 1 [Room A]
- Alexander Yohei Huss (CERN)
- David Sperka (Boston University (US))
- Hongtao Yang (Lawrence Berkeley National Lab. (US))
Parallel: Precision and Properties: Live discussion session 2 [Room A]
- David Sperka (Boston University (US))
- Hongtao Yang (Lawrence Berkeley National Lab. (US))
- Alexander Yohei Huss (CERN)
Parallel: Precision and Properties: Live discussion session 3 [Room A]
- David Sperka (Boston University (US))
- Alexander Yohei Huss (CERN)
- Hongtao Yang (Lawrence Berkeley National Lab. (US))
Description
Parallel A ZOOM Meeting: 683 5990 0577
Passcode: [please register to get this info]
Mattermost channel for discussions: https://mattermost.web.cern.ch/higgs2021/channels/precisions-and-properties
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.
An important goal in the investigation of the Higgs boson is the determination of its CP structure. In this talk, we investigate in detail constraints on the CP nature of the Higgs-fermion-fermion couplings. We take into account all relevant collider constraints in a global fit. Starting with simple effective models featuring CP violation in only one Higgs-fermion-fermion coupling, we...
The latest results are presented in the search for Higgs boson decay to invisible signatures, using the Run-2 data set collected by the CMS experiment.
Offshell production provides a unique way to measure the Higgs boson width and test unitarity in diboson production amplitudes. This process also adds sensitivity when constraining the Higgs boson anomalous couplings. In this talk, studies of offshell Higgs boson production in the ZZ to 2l2nu final state are presented, using Run 2 data from the CMS experiment. Results from the ZZ to 2l2nu...
We explore the new physics reach for the off-shell Higgs boson measurement in the $pp \to H^* \rightarrow Z(\ell^{+}\ell^{-})Z(\nu\bar{\nu})$ channel at the high-luminosity LHC. The new physics sensitivity is parametrized in terms of the Higgs boson width, effective field theory framework, and a non-local Higgs-top coupling form factor. Adopting Machine-learning techniques, we demonstrate that...
The top-quark Yukawa coupling $y_t$ is the strongest interaction of the Higgs boson in the Standard Model (SM) with $y_t \sim 1$. Due to its magnitude, it plays a central role in Higgs phenomenology in the SM and would be most sensitive to physics beyond the Standard Model. The top Yukawa can be directly measured at the LHC via top pair production in association with a Higgs boson...
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 various such techniques, including embedding of simulated objects in data; special...
The LHC is exploring electroweak (EW) physics at the scale EW symmetry is broken. As the LHC and new high energy colliders push our understanding of the Standard Model to ever-higher energies, it will be possible to probe not only the breaking of but also the restoration of EW symmetry. We propose to observe EW restoration in double EW boson production via the convergence of the Goldstone...
The CMS Electromagnetic Calorimeter (ECAL), is a high granularity lead tungstate crystal calorimeter operating at the CERN LHC. The original design placed a premium on excellent energy resolution for the discovery and subsequent characterisation of the Higgs boson. Excellent energy resolution and efficient identification for photons are essential to reconstruct the Higgs boson in the H->gg...
The impact of the finite top-quark mass on the inclusive Higgs
production cross section at higher perturbative orders has been an open
question for almost three decades. In this talk, I report on the
computation of this effect at NNLO QCD. For the
purely gluonic channel, it amounts to $+0.62\%$ relative to the result
obtained in the HEFT approximation. The formally sub-leading
partonic...
We present state-of-the-art predictions for the transverse momentum of
the colour singlet in gluon-fusion Higgs production. We resum this observable at N$^3$LL’ accuracy in momentum space with the RadISH formalism, thus consistently including in our prediction all constant terms of relative order $\alpha_s^3$ with respect to the Born. We supplement our results with a transverse-recoil...
I present predictions for the gluon-fusion Higgs $p_T$ spectrum at N$^3$LL$'$+N$^3$LO including fiducial $H \to \gamma\gamma$ cuts as required by experimental measurements at the LHC. Integrating the spectrum allows us to predict for the first time the total fiducial cross section to third order (N$^3$LO) and improved by resummation. I discuss several aspects of the calculation, including
...
I present state of the art predictions for differential distributions of the decay products of the Higgs boson.
In particular, I demonstrate the impact of next-to-next-to-next-to leading order (N3LO) QCD corrections to the gluon fusion production mechanism. The impact of this newly obtained corrections is required to fully exploit the physics potential of the LHC.
Higgs boson decays to four leptons can be selected with a very high purity and are very well suited for measurements of Higgs boson properties, despite the small H -> ZZ* -> 4l branching ratio. This talk will present measurements of differential cross sections, as well as cross section measurements for the different Higgs boson production processes in the Simplified Template Cross Section...
The talk will present the Run2 legacy measurement on Higgs cross-sections (STXS, fiducial, and differential) in the H->ZZ->4l performed by the CMS collaboration.
Higgs boson decays to two photons can be selected with high efficiency, and the very good invariant mass resolution allows a robust subtraction of the backgrounds. This talk will present measurements of Simplified Template Cross Sections, differential and fiducial cross sections, as measured in the diphoton decay channel by the ATLAS detector using the full Run 2 dataset of pp collision data...
The Higgs boson decay to two W bosons has the largest bosonic branching fraction and can be used to perform some of the most precise measurements of the Higgs boson production cross sections. This talk will present cross section measurements using pp collision data collected at 13 TeV, including those for the different Higgs boson production processes in the Simplified Template Cross Section framework.
We present recent results on the cross section measurement of the Higgs boson production using WW decays and the corresponding constraints on the Higgs boson couplings, as well as constraints on new physics models derived from high mass searches. The talk is focused on the recent measurements exploiting the full Run 2 proton-proton collision data collected by the CMS detector.
Testing the couplings of the Higgs boson to leptons is important to understand the origin of lepton masses. This talk presents measurements of Higgs boson production in Higgs boson decays to two tau leptons based on pp collision data collected at 13 TeV.
The latest Higgs cross section and differential distribution measurements with CMS data in the H->tautau final state will be discussed.
The most precise measurements of Higgs boson cross sections, using the framework of simplified template cross sections, are obtained from a combination of measurements performed in the different Higgs boson decay channels using pp collision data with a center-of-mass energy of 13 TeV. This talk presents the combined measurements, as well as their interpretations in terms of Higgs coupling...
The electroweak symmetry breaking (EWSB) mechanism is still an undecided question in particle physics. We propose to utilize the single top quark and Higgs associated production ($th$), $Zh$ production via gluon fusion at the LHC to probe the couplings between the Higgs and the gauge bosons and further to test the EWSB. We demonstrate that the $th$ and $gg\to Zh$ productions are sensitive to...
