Description
Conveners:
Ilaria Brivio (Universita di Bologna)
Karsten Köneke (Universität Freiburg)
Matthias Schröder (Universität Hamburg)
Contact: eps23-conveners-t09 @desy.de
The mass of the Higgs boson is a fundamental parameter of the Standard Model which can be measured most precisely in its decays to four leptons and two photons, which benefit from excellent mass resolution. The total width of the Higgs boson is another important parameter for Higgs sector phenomenology. It is too small to be measured directly at the LHC, but indirect measurements can be...
The Higgs boson mass, and its decay width, are fundamental properties of this particle. Here, we discuss the latest measurements of these properties, as well as their future prospects, with the CMS experiment.
While the Standard Model predicts that the Higgs boson is a CP-even scalar, CP-odd contributions to the Higgs boson interactions with vector bosons and fermions are presently not strongly constrained. A variety of Higgs boson production processes and decays can be used to study the CP nature of the Higgs boson interactions. This talk presents the most recent results of such analyses by the...
We discuss recent results of Higgs boson measurements with the CMS experiment, where the Higgs boson has high transverse momentum and its decay products are merged. Several production modes and final state channels are presented.
We report progress on the inclusive hadroproduction of a Higgs+jet system at LHC and FCC collision energies. Kinematic sectors explored fall into the so-called semi-hard regime, where both the fixed-order and the high-energy dynamics come into play. We propose a novel version of a matching procedure aimed at combining NLO fixed-order computations, as obtained from POWHEG, with the NLL...
In this talk, the latest results from the CMS experiment on inclusive and simplified template cross section measurements of the Higgs boson are discussed. We cover the latest measurements for the fermionic decay channels in this presentation. Measurements of the Higgs boson couplings in the fermionic Higgs boson decay channels are also presented.
Detailed measurements of Higgs boson properties and its interactions can be performed using its decays into fermions, providing a key window into the nature of the Yukawa interactions. This talk presents the latest measurements of the Higgs boson properties in various leptonic (ττ, μμ) and quark (bb,cc) decay channels by the ATLAS experiment, using the full Run 2 pp collision dataset collected...
The study of Higgs boson production in association with one or two top quarks provides a key window into the properties of the two heaviest fundamental particles in the Standard Model, and in particular into their couplings. This talk presents measurements of tH and ttH production in pp collisions collected at 13 TeV with the ATLAS detector using the full Run 2 dataset of the LHC.
In this talk, the latest results from the CMS experiment on inclusive and simplified template cross section measurements of the Higgs boson are discussed. We cover the latest measurements for the bosonic decay channels in this presentation. Measurements of the Higgs boson couplings in the bosonic Higgs boson decay channels are also presented.
Higgs boson decays to bosons provide very detailed measurements of its properties and interactions, and shine light on the mechanism of electroweak symmetry breaking. This talk presents the latest measurements of the Higgs boson coupling properties performed by the ATLAS experiment in various bosonic decay channels (WW, ZZ and yy) using the full Run 2 pp collision dataset collected at 13 TeV. ...
We present an overview of the most recent differential and fiducial Higgs boson cross section measurements from CMS. A variety of Higgs boson final states are covered.
The Higgs boson decay to two W bosons provides the largest branching fraction among bosonic decays, and can be used to perform some of the most precise measurements of the Higgs boson production cross sections. This talk presents Higgs boson fiducial and differential cross section measurements by the ATLAS experiment in the WW decay channel, targeting both the gluon-gluon fusion and...
Simplified template cross-sections provide a detailed description of the properties of Higgs boson production at the LHC. They are most precisely determined in the combination of the measurements performed in the different Higgs boson decay channels. This talk presents these combined measurements, as well as their interpretations in the context of specific scenarios of physics beyond the...
In the decade since the discovery of the Higgs boson, its properties have been measured in detail, and appear to be consistent with the expectation of the Higgs boson in the SM. However, anomalous contributions to the Higgs boson couplings are not excluded. In this talk we review the most recent results from the CMS experiment on anomalous Higgs boson couplings. Interpretations of such...
We analyse the sensitivity to beyond-the-Standard-Model effects of hadron collider processes involving the interaction of two electroweak and two Higgs bosons, VVHH, with V being either a W or a Z boson.
We examine current experimental results by the CMS collaboration in the context of a dimension-8 extension of the Standard Model in an effective-field-theory formalism. We show that...
Precision measurements of diboson production at the LHC is an important probe of the limits of the Standard Model. The gluon-fusion channel of this process offers a connection between the Higgs and top sectors. We study in a systematic way gluon-induced diboson production in the Standard Model Effective Field Theory. We compute the helicity amplitudes of double Higgs, double $Z/W$ and...
We discuss rare Higgs boson production and decay channel searches with the CMS experiment. A particular focus of this talk are searches for very rare Higgs boson decays to a neutral light meson or quarkonium and a photon or Z boson, whose standard model branching fraction predictions are in the range 10^{-4}-10^{-9}. Such searches can help constrain Yukawa couplings to light and charm quarks....
Rare Higgs boson production and decay modes provide a crucial probe of Higgs boson properties if potential deviations from the predictions of the Standard Model. In this presentation, the latest results of measurements of rare Higgs boson production and decay modes by the ATLAS experiment are shown using the large data samples collected in pp collisions at 13 TeV during Run 2 of the LHC.
We present searches for exotic decays of the Higgs boson with the CMS experiment. Searches where the 125 GeV Higgs boson decays into two low-mass scalars are discussed. We also present searches for the 125 GeV Higgs boson decaying to a Z boson and a low-mass scalar. Searches for invisibly decaying Higgs bosons are also covered.
Searches for additional Higgs bosons at masses above 60 GeV with the CMS experiment are presented. A variety of final states, such as decays into pairs of photons or pairs of tau leptons, are discussed. We also cover searches for additional Higgs bosons which decay into pairs of 125 GeV Higgs bosons, or a 125 GeV Higgs boson and another particle.
New narrow resonances are a generic signature of models of new phenomena beyond the Standard Model. The clean signatures of the final states composed of two photons or a Z boson and a photon provide sensitivity to a wide class of such signals, in particular axion-like particles (ALPs) and Higgs-like scalar particles. The results of several such searches by the ATLAS experiment are presented...
The trilinear Higgs coupling $\lambda_{hhh}$ is a crucial tool to probe the structure of the Higgs potential and to search for possible effects of physics beyond the Standard Model (SM). Focusing on the Two-Higgs-Doublet Model as a concrete example, I will discuss the calculation of the leading two-loop corrections to $\lambda_{hhh}$, and show that this coupling can be significantly enhanced...
Most of the current experimental searches for charged Higgs bosons at the Large Hadron Collider (LHC) concentrate upon the $tb$ and $\tau\nu$ decay channels. In this study, we analyze the feasibility of the bosonic decay channel $W^{\pm (*)} h$ instead, with the charged gauge boson being either on-shell or off-shell and $h$ being a neutral light Higgs boson. Focusing on the Two-Higgs Doublet...
The new version of SusHi is introduced. It features a unified input for SM and BSM parameters for higher-order total cross sections for Higgs production in gluon fusion, heavy-quark annihilation, as well as Higgs-Strahlung. Like previous versions of SusHi, it provides links to codes like 2HDMC and FeynHiggs, but can also process standard SLHA output of spectrum generators like SoftSusy and SPheno.
Supersymmetric models with radiatively-driven naturalness (RNS) enjoy low electroweak fine-tuning whilst respecting LHC search limits on gluinos and top squarks and allowing for $m_h\simeq 125$ GeV. While the heavier Higgs bosons $H,\ A$ may have TeV-scale masses, the SUSY conserving $\mu$ parameter must lie in the few hundred GeV range. Thus, in natural SUSY models there should occur large...
The investigation of the trilinear self-coupling of the discovered Higgs boson is one of the main goals of particle physics in the near future.
We provide predictions for this coupling, expressed in terms of the coupling modifier $\kappa_\lambda$, incorporating one-loop corrections within arbitrary renormalizable QFTs.
The presented framework (implemented in the public code ${\tt anyH3}$)...
We consider the next-to-leading order electroweak corrections to the Higgs boson pair production in gluon fusion. This requires the computation of two-loop four-point amplitudes with massive internal particles such as top quarks, Higgs and gauge bosons. We perform analytic calculations both in the high-energy and large top-quark mass limits. In particular, we show that our high energy...
Gaining information about the shape of the Higgs potential is one of the main goals of particle physics for the coming years. The trilinear Higgs self-interactions can directly be probed via Higgs pair production, which at the LHC happens dominantly through gluon fusion. In models with extended Higgs sectors the trilinear self-coupling of the detected Higgs boson can largely deviate from the...
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 Higgs boson is one of the main interests of the particle physics community. To strive for its full characterization, a new era of precise measurements has begun and will continue for the next two to five decades, as foreseen by recent updates of the European Strategy for Particle Physics. Of utmost importance is the exploration of the particle’s interaction with itself. In this talk, the...
Experimental information on the trilinear Higgs boson self-coupling $\kappa_3$ and the quartic self-coupling $\kappa_4$ will be crucial for gaining insight into the shape of the Higgs potential and the nature of the electroweak phase transition. While Higgs pair production processes provide access to $\kappa_3$, triple Higgs production processes, despite their small cross sections, will...
Higgs physics with ILC
speaker TBA
Technologically mature accelerator and detector design and well understood physics program makes ILC is a realistic option for realization of a future Higgs factory. Energy staged data collection, employment of beam polarization and capability to reach a TeV center-of-mass energy, enable unique sensitivity to New Physic's deviations from the Standard...
The Higgs mechanism is a central part of the Standard Model which has not yet been fully established experimentally without the measurement of the Higgs self-coupling. Future linear $e^+e^-$ colliders are able to access center-of-mass energies of 500 GeV and beyond and can therefore probe the Higgs self-coupling directly through the measurement of double Higgs production. A new analysis of the...
e study possible CP-violation effect of the Higgs to Z boson coupling
at the future $e^+e^−$ collider. We find that the azimuthal angular distribution of the muon, produced by $e^+e^− \rightarrow HZ → H\mu^−\mu^+$, can be sensitive to such a CP-violation effect when we apply initial transversely polarized beams. Based on this angular
distribution, we construct a CP sensitive asymmetry, and...
Although the studies of tensor structure of the Higgs boson interactions with vector bosons and fermions at CMS and ATLAS experiments have established that the JPC quantum numbers of the Higgs boson should be 0++, small CP violation in the Higgs sector (i.e. less than 10% contribution of the CP-odd state) cannot be excluded with the current experimental precision. We review possibility to...
The European Strategy for Particle Physics has identified an e$^+$e$^-$ Higgs factory as its top priority for a post-LHC collider, as a first step towards a future hadron collider at the energy frontier. Precision measurements and searches for new phenomena in the Higgs sector are among the most important goals in particle physics. Electron-positron collisions at the CERN Future Circular...
The hadron collider phase of the Future Circular Collider (FCC-hh) is a proton-proton collider operating at a center-of-mass energy of 100 TeV. It is one of the most ambitious projects planned for the rest of this century and offers ample opportunities in the hunt for new physics, both through its direct detection reach as well as through indirect evidence from precision measurements....
The Large Hadron-electron Collider and the Future Circular Collider in electron-hadron mode [1] will make possible the study of DIS in the TeV regime providing electron-proton collisions with instantaneous luminosities of $10^{34}$ cm$^{−2}$s$^{−1}$. With a charged current cross section around 200 (1000) fb at the LHeC (FCC-eh), Higgs bosons will be produced abundantly. We examine the...
Multi-TeV center of mass energies muon collisions are an ideal environment for studying Higgs boson properties. At these energies the high production rates will allow precise measurements of its couplings to fermions and bosons. Moreover, in such collisions it will be possible to study the Higgs potential by measuring the double Higgs production cross section and determining the trilinear...
