scholarly journals Interference effects in Higgs production through Vector Boson Fusion in the Standard Model and its singlet extension

2016 ◽  
Vol 2016 (1) ◽  
Author(s):  
Alessandro Ballestrero ◽  
Ezio Maina
Keyword(s):  
Standard Model ◽  
Vector Boson ◽  
Higgs Production ◽  
Vector Boson Fusion ◽  
Interference Effects ◽  
The Standard Model

scholarly journals Search for dark photons in Higgs boson production via vector boson fusion in proton-proton collisions at $$ \sqrt{s} $$ = 13 TeV

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
A. M. Sirunyan ◽  
◽  
A. Tumasyan ◽  
W. Adam ◽  
T. Bergauer ◽  
...  
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Confidence Level ◽  
Branching Fraction ◽  
Vector Boson ◽  
Boson Mass ◽  
Higgs Boson Mass ◽  
Vector Boson Fusion ◽  
Upper Limit ◽  
The Standard Model

Abstract A search is presented for a Higgs boson that is produced via vector boson fusion and that decays to an undetected particle and an isolated photon. The search is performed by the CMS collaboration at the LHC, using a data set corresponding to an integrated luminosity of 130 fb−1, recorded at a center-of-mass energy of 13 TeV in 2016–2018. No significant excess of events above the expectation from the standard model background is found. The results are interpreted in the context of a theoretical model in which the undetected particle is a massless dark photon. An upper limit is set on the product of the cross section for production via vector boson fusion and the branching fraction for such a Higgs boson decay, as a function of the Higgs boson mass. For a Higgs boson mass of 125 GeV, assuming the standard model production rates, the observed (expected) 95% confidence level upper limit on the branching fraction is 3.5 (2.8)%. This is the first search for such decays in the vector boson fusion channel. Combination with a previous search for Higgs bosons produced in association with a Z boson results in an observed (expected) upper limit on the branching fraction of 2.9 (2.1)% at 95% confidence level.

scholarly journals Search for the standard model Higgs boson produced through vector boson fusion and decaying tobb¯

2015 ◽  
Vol 92 (3) ◽  
Author(s):  
V. Khachatryan ◽  
A. M. Sirunyan ◽  
A. Tumasyan ◽  
W. Adam ◽  
E. Asilar ◽  
...  
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Vector Boson ◽  
Standard Model Higgs Boson ◽  
Vector Boson Fusion ◽  
The Standard Model

scholarly journals A Heavy Scalar at the LHC from Vector-Boson Fusion

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Qiurong Mou ◽  
Sibo Zheng
Keyword(s):  
Standard Model ◽  
Vector Boson ◽  
Mass Range ◽  
New Physics ◽  
Vector Boson Fusion ◽  
Mixing Angle ◽  
The Standard Model ◽  
Scalar Mass ◽  
Event Simulations ◽  
Integrated Luminosity

A hypothetical scalar mixed with the standard model Higgs appears in few contexts of new physics. This study addresses the question what mass range is in the reach of 14 TeV LHC given different magnitudes of mixing angle α, where event simulations are based on production from vector-boson fusion channel and decays into SM leptons through WW or ZZ. It indicates that heavy scalar mass up to 539 GeV and 937 GeV can be excluded by integrated luminosity of 300 fb-1 and 3000 fb-1, respectively, for sin2α larger than 0.04.

scholarly journals Measurements of Higgs bosons decaying to bottom quarks from vector boson fusion production with the ATLAS experiment at $$\sqrt{s}=13\,\text {TeV}$$

2021 ◽  
Vol 81 (6) ◽  
Author(s):  
◽  
G. Aad ◽  
B. Abbott ◽  
D. C. Abbott ◽  
A. Abed Abud ◽  
...  
Keyword(s):  
Standard Model ◽  
Vector Boson ◽  
Hadron Collider ◽  
Higgs Bosons ◽  
Measured Signal ◽  
Proton Collision ◽  
Vector Boson Fusion ◽  
Quark Pairs ◽  
Atlas Experiment ◽  
The Standard Model

AbstractThe paper presents a measurement of the Standard Model Higgs Boson decaying to b-quark pairs in the vector boson fusion (VBF) production mode. A sample corresponding to 126 $$\hbox {fb}^{-1}$$ fb - 1 of $$\sqrt{s} = 13\,\text {TeV}$$ s = 13 TeV proton–proton collision data, collected with the ATLAS experiment at the Large Hadron Collider, is analyzed utilizing an adversarial neural network for event classification. The signal strength, defined as the ratio of the measured signal yield to that predicted by the Standard Model for VBF Higgs production, is measured to be $$0.95^{+0.38}_{-0.36}$$ 0 . 95 - 0.36 + 0.38 , corresponding to an observed (expected) significance of 2.6 (2.8) standard deviations from the background only hypothesis. The results are additionally combined with an analysis of Higgs bosons decaying to b-quarks, produced via VBF in association with a photon.

scholarly journals Enhancing sensitivities to long-lived particles with high granularity calorimeters at the LHC

2020 ◽  
Vol 2020 (11) ◽  
Author(s):  
Jia Liu ◽  
Zhen Liu ◽  
Lian-Tao Wang ◽  
Xiao-Ping Wang
Keyword(s):  
Standard Model ◽  
Vector Boson ◽  
Hadron Collider ◽  
Branching Ratio ◽  
Gluon Fusion ◽  
Vector Boson Fusion ◽  
Signal Model ◽  
Enhanced Sensitivity ◽  
Higgs Decay ◽  
The Standard Model

Abstract The search for long-lived particles (LLP) is an exciting physics opportunity in the upcoming runs of the Large Hadron Collider. In this paper, we focus on a new search strategy of using the High Granularity Calorimeter (HGCAL), part of the upgrade of the CMS detector, in such searches. In particular, we demonstrate that the high granularity of the calorimeter allows us to see “shower tracks” in the calorimeter, and can play a crucial role in identifying the signal and suppressing the background. We study the potential reach of the HGCAL using a signal model in which the Standard Model Higgs boson decays into a pair of LLPs, h → XX. After carefully estimating the Standard Model QCD and the misreconstructed fake-track backgrounds, we give the projected reach for both an existing vector boson fusion trigger and a novel displaced-track-based trigger. Our results show that the best reach for the Higgs decay branching ratio, BR(h → XX), in the vector boson fusion channel is about $$ \mathcal{O} $$ O (10−4) with lifetime cτX ∼ 0.1–1 meters, while for the gluon gluon fusion channel it is about $$ \mathcal{O} $$ O (10−5–10−6) for similar lifetimes. For longer lifetime cτX ∼ 103 meters, our search could probe BR(h → XX) down to a few ×10−4(10−2) in the gluon gluon fusion (vector boson fusion) channels, respectively. In comparison with these previous searches, our new search shows enhanced sensitivity in complementary regions of the LLP parameter space. We also comment on many improvements can be implemented to further improve our proposed search.

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