scholarly journals Fiducial cross sections for the lepton-pair-plus-photon decay mode in Higgs production up to NNLO QCD

2022 ◽  
Vol 2022 (1) ◽  
Author(s):  
X. Chen ◽  
T. Gehrmann ◽  
E. W. N. Glover ◽  
A. Huss
Keyword(s):  
Higgs Boson ◽  
Decay Mode ◽  
Cross Sections ◽  
Gluon Fusion ◽  
Lepton Pair ◽  
Distinctive Features ◽  
Photon Decay ◽  
Higgs Decay ◽  
Decay Products ◽  
Three Body

Abstract The rare three-body decay of a Higgs boson to a lepton-antilepton pair and a photon is starting to become experimentally accessible at the LHC. We investigate how higher-order QCD corrections to the dominant gluon-fusion production process impact on the fiducial cross sections in this specific Higgs decay mode for electrons and muons. Corrections up to NNLO QCD are found to be sizeable. They are generally uniform in kinematical variables related to the Higgs boson, but display several distinctive features in the kinematics of its individual decay products.

scholarly journals tt̄H Coupling Measurement with the ATLAS Detector at the LHC

2018 ◽  
Vol 182 ◽  
pp. 02052
Author(s):  
Asma Hadef
Keyword(s):  
Higgs Boson ◽  
Cross Sections ◽  
Top Quark ◽  
High Energy Physics ◽  
Center Of Mass ◽  
High Energy ◽  
New Physics ◽  
Decay Modes ◽  
Center Of Mass Energy ◽  
Higgs Decay

The Higgs boson was discovered on the 4th of July 2012 with a mass around 125 GeV by ATLAS and CMS experiments at LHC. Determining the Higgs properties (production and decay modes, couplings,...) is an important part of the high-energy physics programme in this decade. A search for the Higgs boson production in association with a top quark pair (tt̄H) at ATLAS [1] is summarized in this paper at an unexplored center-of-mass energy of 13 TeV, which could allow a first direct measurement of the top quark Yukawa coupling and could reveal new physics. The tt̄H analysis in ATLAS is divided into 3 channels according to the Higgs decay modes: H → Hadrons, H → Leptons and H → Photons. The best-fit value of the ratio of observed and Standard Model cross sections of tt̄H production process, using 2015-2016 data and combining all tt̄H final states, is 1:8±0:7, corresponds to 2:8σ (1:8σ) observed (expected) significance.

ON THE DECAY OF A HEAVY HIGGS BOSON INTO Z+LEPTON PAIR IN E6 SUPERSTRING MODELS

1989 ◽  
Vol 04 (14) ◽  
pp. 3629-3633
Author(s):  
G. PÓCSIK ◽  
T. TORMA
Keyword(s):  
Higgs Boson ◽  
Energy Distribution ◽  
Decay Mode ◽  
Lepton Pair ◽  
Energy Distributions ◽  
Parameter Ranges ◽  
Heavy Higgs Boson

We calculate the width (Γ) and differential energy distributions of [Formula: see text] in E6-based models containing one extra U(1). For a fixed Z′ mass, Γ is strongly growing with increasing mH, while for a fixed mH it decreases strongly with increasing mz′. The energy distribution of Z has a pronounced maximum tending to larger energies of Z with increasing mH, for a fixed mz′. In certain parameter ranges, Γ is larger than the width of the [Formula: see text] decay mode.

scholarly journals Synthesis on Heavy Higgs from the Standard Model to 2HDM and Beyond

2020 ◽  
Vol 18 ◽  
pp. 110-142
Author(s):  
Abdeljalil Habjia
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Cross Sections ◽  
Particle Physics ◽  
Hadron Collider ◽  
Signal Strength ◽  
Beyond The Standard Model ◽  
Decay Channels ◽  
Higgs Decay ◽  
The Standard Model

In the context of particle physics, within the ATLAS and CMS experiments at large hadron collider (LHC), this work presents the discussion of the discovery of a particle compatible with the Higgs boson by the combination of several decay channels, with a mass of the order of 125.5 GeV. With increased statistics, that is the full set of data collected by the ATLAS and CMS experiments at LHC ( s1/2 = 7GeV and s1/2 = 8GeV ), the particle is also discovered individually in the channel h-->γγ with an observed significance of 5.2σ and 4.7σ, respectively. The analysis dedicated to the measurement of the mass mh and signal strength μ which is defined as the ratio of σ(pp --> h) X Br(h-->X) normalized to its Standard Model where X = WW*; ZZ*; γγ ; gg; ff. The combined results in h-->γγ channel gave the measurements: mh = 125:36 ± 0:37Gev, (μ = 1:17 ± 0:3) and the constraint on the width Γ(h) of the Higgs decay of 4.07 MeV at 95%CL. The spin study rejects the hypothesis of spin 2 at 99 %CL. The odd parity (spin parity 0- state) is excluded at more than 98%CL. Within the theoretical and experimental uncertainties accessible at the time of the analysis, all results: channels showing the excess with respect to the background-only hypothesis, measured mass and signal strength, couplings, quantum numbers (JPC), production modes, total and differential cross-sections, are compatible with the Standard Model Higgs boson at 95%CL. Although the Standard Model is one of the theories that have experienced the greatest number of successes to date, it is imperfect. The inability of this model to describe certain phenomena seems to suggest that it is only an approximation of a more general theory. Models beyond the Standard Model, such as 2HDM, MSSM or NMSSM, can compensate some of its limitations and postulate the existence of additional Higgs bosons.

CHARGED HIGGS BOSON DECAY H± → ϒW±: THE EFFECTS OF P- AND D-STATES

1991 ◽  
Vol 06 (17) ◽  
pp. 1575-1579 ◽  
Author(s):  
R. W. ROBINETT ◽  
L. WEINKAUF
Keyword(s):  
Higgs Boson ◽  
Decay Mode ◽  
Parameter Space ◽  
Charged Higgs Boson ◽  
Higgs Decay ◽  
Charged Higgs ◽  
D Wave

We calculate the effects of including P- and D-wave quarkonium states in the charged Higgs decay mode H± → ϒW±. We find no interesting region of parameter space in which the P- and D-wave contributions have a significant effect.

scholarly journals Polarized Z bosons from the decay of a Higgs boson produced in association with two jets at the LHC

2021 ◽  
Vol 81 (11) ◽  
Author(s):  
Ezio Maina ◽  
Giovanni Pelliccioli
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Vector Boson ◽  
Z Bosons ◽  
Gluon Fusion ◽  
Gauge Sector ◽  
Fully Differential ◽  
Higgs Decay ◽  
Four Leptons ◽  
Two Jets

AbstractInvestigating the polarization of weak bosons provides an important probe of the scalar and gauge sector of the Standard Model. This can be done in the Higgs decay to four leptons, whose Standard-Model leading-order amplitude enables to generate polarized observables from unpolarized ones via a fully-differential reweighting method. We study the $$\text {Z} $$ Z -boson polarization from the decay of a Higgs boson produced in association with two jets, both in the gluon-fusion and in the vector-boson fusion channel. We also address the possibility of extending the results of this work to higher orders in perturbation theory.

Light CP-odd Higgs boson production of the NMSSM in bottom-gluon fusion at the LHC

2020 ◽  
Vol 35 (25) ◽  
pp. 2050151
Author(s):  
M. M. Almarashi
Keyword(s):  
Higgs Boson ◽  
Decay Mode ◽  
Parameter Space ◽  
Gluon Fusion ◽  
Boson Production ◽  
High Luminosity ◽  
Higgs Boson Production

We study the [Formula: see text] decay mode of a light CP-odd Higgs boson of the NMSSM, [Formula: see text], produced in bottom-gluon fusion at the LHC. It is shown that for high luminosity of the LHC, there exist regions of the NMSSM parameter space that can be exploited to detect the [Formula: see text] through this channel.

scholarly journals Measurements of Higgs boson production cross sections and couplings in the diphoton decay channel at $$ \sqrt{\mathrm{s}} $$ = 13 TeV

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
◽  
A. M. Sirunyan ◽  
A. Tumasyan ◽  
W. Adam ◽  
J. W. Andrejkovic ◽  
...  
Keyword(s):  
Higgs Boson ◽  
Cross Sections ◽  
Top Quark ◽  
Production Cross ◽  
Vector Boson ◽  
Signal Strength ◽  
Gluon Fusion ◽  
Boson Production ◽  
Vector Boson Fusion ◽  
Higgs Boson Production

Abstract Measurements of Higgs boson production cross sections and couplings in events where the Higgs boson decays into a pair of photons are reported. Events are selected from a sample of proton-proton collisions at $$ \sqrt{s} $$ s = 13 TeV collected by the CMS detector at the LHC from 2016 to 2018, corresponding to an integrated luminosity of 137 fb−1. Analysis categories enriched in Higgs boson events produced via gluon fusion, vector boson fusion, vector boson associated production, and production associated with top quarks are constructed. The total Higgs boson signal strength, relative to the standard model (SM) prediction, is measured to be 1.12±0.09. Other properties of the Higgs boson are measured, including SM signal strength modifiers, production cross sections, and its couplings to other particles. These include the most precise measurements of gluon fusion and vector boson fusion Higgs boson production in several different kinematic regions, the first measurement of Higgs boson production in association with a top quark pair in five regions of the Higgs boson transverse momentum, and an upper limit on the rate of Higgs boson production in association with a single top quark. All results are found to be in agreement with the SM expectations.

scholarly journals Higgs boson production in the U(1)B−L model at the ILC

2016 ◽  
Vol 31 (17) ◽  
pp. 1650099 ◽  
Author(s):  
Jinzhong Han ◽  
Bingfang Yang ◽  
Ning Liu ◽  
Jitao Li
Keyword(s):  
Higgs Boson ◽  
Cross Sections ◽  
Linear Collider ◽  
Decay Channel ◽  
Production Cross ◽  
International Linear Collider ◽  
Boson Production ◽  
Higgs Boson Production ◽  
Higgs Decay ◽  
Production Processes

In the framework of the minimal [Formula: see text] extension of the Standard Model, we investigate the Higgs boson production processes [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] at the International Linear Collider (ILC). We present the production cross-sections, the relative corrections and compare our results with the expected experimental accuracies for Higgs decay channel [Formula: see text]. In the allowed parameter space, we find that the effects of the three single Higgs boson production processes might approach the observable threshold of the ILC. But the Higgs signal strengths [Formula: see text] of the two double Higgs boson production processes are all out of the observable threshold so that these effects will be difficult to be observed at the ILC.

scholarly journals MORE SIGNATURES OF THE INTERMEDIATE MASS HIGGS BOSON

1999 ◽  
Vol 14 (22) ◽  
pp. 1479-1486 ◽  
Author(s):  
PANKAJ AGRAWAL
Keyword(s):  
Higgs Boson ◽  
Decay Mode ◽  
Mass Range ◽  
Lepton Pair ◽  
Tau Lepton ◽  
Intermediate Mass

We examine the potential signatures of the Higgs boson when it decays into a tau–lepton pair. We show that with the proper identification of the tau-jet, this decay mode can lead to the identification of the Higgs boson over most of the intermediate mass range (MW<MH<2MW).

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