Conveners
Electroweak, Top and Higgs Physics: Session 1
- Seth Zenz (Imperial College (GB))
Electroweak, Top and Higgs Physics: Session 2
- Jose Santiago Perez (Universidad de Granada (ES))
Electroweak, Top and Higgs Physics: Session 3
- Valerio Dao (CERN)
Electroweak, Top and Higgs Physics: Session 4
- Jose Santiago Perez (Universidad de Granada (ES))
Electroweak, Top and Higgs Physics: Session 5
- Susanne Westhoff (Heidelberg University)
In the next-to minimal supersymmetric standard model (NMSSM) an additional singlet-like Higgs boson with small couplings to the standard model (SM) particles is introduced. Although the mass can be well below the discovered 125 GeV Higgs boson its small couplings may make a discovery at the LHC difficult.
We use a novel scanning technique to efficiently scan the whole parameter space and...
The MSSM predicts the existence of additional neutral and charged Higgs
bosons. This presentation will discuss results from recent searches for
neutral Higgs bosons in several leptonic decay channels based on collision
data collected at 13 TeV, and their interpretation within the MSSM.
The MSSM predicts the existence of additional neutral and charged Higgs
bosons. This presentation will discuss results from recent searches for
charged Higgs bosons in several decay channels based on collision data
collected at 13 TeV, and their interpretation within the MSSM.
The next-to-minimal supersymmetric Standard Model (NMSSM) contains two additional singlet-like Higgs bosons, one scalar and one pseudoscalar, besides the three neutral ones of the MSSM. A signature of either of these new Higgs bosons at the Large Hadron Collider (LHC) can prove crucial for establishing the non-minimal nature of supersymmetry. However, their masses are essentially free...
The precise study of the Higgs boson properties -- in particular its mass and couplings -- is of paramount importance for the study of BSM models with enlarged Higgs sectors.
In particular, when investigating the high-scale behaviour of these models, the scalar quartic couplings must be extracted from the physical spectrum. I will show that it is then crucial to include all known higher-order...
We propose a new dynamical relaxation mechanism for the little hierarchy problem, based on a singlet extension of the minimal supersymmetric standard model (MSSM).
In this scenario, a small soft mass parameter of an MSSM singlet is responsible for the electroweak symmetry breaking and the non-zero Higgs vacuum expectation value, whereas the effect of a large soft mass parameter of the Higgs...
Theories beyond the Standard Model predict Higgs boson decays that do not
exist in the Standard Model, such as decays into two light bosons (a). This
talk presents recent results based on pp collision data collected at 13 TeV.
Theories beyond the Standard Model predict Higgs boson decays at a much
enhanced rate compared to the Standard Model, e.g. for decays to Z+photon or a
meson and a photon. This talk presents recent results based pp collision data
collected at 13 TeV.
Assume that dark matter couples mostly to the top-quark. This hypothesis is well motivated in models with scalar mediators, where flavor-hierarchical couplings to quarks prevent large flavor-changing neutral currents. In this talk, we discuss searches for dark matter produced in association with top-quarks at the LHC. We propose single-top-associated production as a new search channel for dark...
A systematic procedure to obtain the 1-loop low-energy effective Lagrangian resulting from integrating out the heavy fields of a given ultraviolet theory is presented in this talk. It is shown that the matching coefficients are determined entirely by the hard region of the functional determinant involving the heavy fields. This represents an important simplification with respect the...
Precision measurements of multi-boson production is a validation of the Standard Model. These multi-boson processes are a background to Higgs measurements and searches for Beyond the Standard Model physics. In this talk, we present the recent measurements of multiboson final states performed in CMS, involving W, Z and photon combinations. Inclusive and differential cross sections are compared...
The production of massive vector boson pairs is a key process for the understanding of the non-abelian gauge structure of the standard model and for the comprehension of the electroweak symmetry breaking mechanism. The study of the production of vector boson pairs with the presence of two jets in the event allows to measure the electroweak production of vector bosons in association with jets,...
Measurements of Higgs boson properties and cross sections measured in Higgs
boson decays to two photons, two Z bosons, and two W bosons based on pp
collision data collected at 13 TeV are presented. In addition, results from
the combination of different decay channels are shown.
Measurements and searches of Higgs boson decays to two third- or two second-
generation quarks or leptons are presented using pp collision data
collected at 13 TeV.
I will describe a version of the dimensional regularization of a classically scale invariant theory, motivated by the requirement to preserve scale invariance at the level of loop corrections. The theory is embedded in a nonrenormalizable Lagrangian, where both the dimensionful regulator \mu and suppression scale of higher-dimensional interactions are interpreted as a vev of a new dynamical...
Gauge coupling unification and the stability of the Higgs vacuum are among two of the cherished features of low-energy supersymmetric models. Though low-energy supersymmetry is still viable, it could be that supersymmetry is manifest only at very high energies. If this is the case, it is a legitimate question whether any or all of the problems with cures normally attributed to weak-scale...
Measurements of the inclusive and differential cross-sections of top-quark
production in proton-proton collisions at centre-of-mass energy of 13 TeV with
the ATLAS detector at the Large Hadron Collider are presented. Single top-quark and top-quark pair final states as well as top-quark production in association with vector bosons are considered. The measurements reach high precision and are...
The top quark is the heaviest known fundamental particle. As it is the only quark that decays before it hadronizes, this gives the unique opportunity to probe the properties of bare quarks. This talk will focus on a few recent precision measurements of top quark properties in top-quark pair and single top-quark events by the ATLAS Collaboration. Measurements of the top quark mass and searches...
The top quark mass is a fundamental parameter of the Standard Model, entering in the precision tests even before the Higgs discovery and playing a crucial role in any assumption on the stability of the electroweak vacuum. Therefore, determining it with the highest precision and having under control all sources of errors will be of paramount importance. I will investigate the uncertainties in...
We present the measurements of production of the standard model Higgs boson in association with a pair of top quarks. Several Higgs decays are considered and combined together. This search is performed on the full 13-TeV dataset of proton-proton collisions collected by the CMS experiment at the LHC in 2016.
The search for the production of the Higgs Boson with a pair of top-anti-top
quarks is both very important and very challenging. This talks 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, as well as their combined results.
We review recent progress in the prediction of SUSY Higgs boson masses, focusing on the MSSM and its extensions. The corrections are being included into the public code FeynHiggs. Numerical examples are presented, showing the improved higher-order calculations.
Di-Higgs final states can arise through non-resonant production of two Higgs
bosons and through potential heavy states decaying to two Higgs boson. This
talk presents searches in several Higgs boson decay channels using 36 fb-1 of
pp collision data recorded at 13 TeV.
The measurement of the triple Higgs coupling is a key benchmark for the LHC and future colliders. It directly probes the Higgs potential and its fundamental properties in connection to new physics beyond the Standard Model. We show how the invariant mass distribution of the Higgs pair offers a systematic way to extract the Higgs self-coupling, focusing on the leading channel pp โ hh + X โ b ฬb...
We propose that natural TeV-scale new physics (NP) with $O(1)$ couplings to the standard model (SM) quarks may lead to a universal enhancement of the Yukawa couplings of all the light quarks, perhaps to a size comparable to that of the SM b-quark Yukawa coupling, i.e., $y_q โผ O(y_b^{SM})$ for $q = u, d, c, s$. I will discuss this scenario in an effective field theory (EFT) extension of the SM,...
Models with extended Higgs sector predict that the diagonal Higgs couplings to fermions could deviate from the SM predictions, while non-diagonal flavor-violating Higgs couplings could appear too. We describe these possibilities within the context of multi-Higgs doublet models that employ the Froggart-Nielsen mechanism to generate the Yukawa hierarchies. The mixing of the Higgs doublets...
We calculate all NMSSM Higgs-boson decays to SM particles at the full one-loop level. Special attention is paid to treat the MSSM part exactly as in the pure MSSM calculation. In this way any deviations can be attributed directly to the extended Higgs (and neutralino) structure in the NMSSM. We compare our results with several approximations used in the literature and emphasize the numerical...
We present full one-loop calculations for SUSY particle production at e+e- colliders. This includes hard and soft QED/QCD radiation and a proper treatment of complex phases. We show the relevance of the higher-order corrections for the extraction of the underlying SUSY parameters.
