Article
Physics, Particles & Fields
F. Arco, S. Heinemeyer, M. Muehlleitner, K. Radchenko
Summary: An important task of the LHC is to study the Higgs-boson sector, particularly the reconstruction of the Higgs potential. Based on previous analyses, we evaluate the di-Higgs production cross sections within the 2-Higgs-Doublet Model type I and find regions of the allowed parameter space where the cross section differs significantly from its standard model prediction, indicating possible deviations in the Higgs self-couplings. We further analyze the sensitivity to beyond-the-standard model triple Higgs couplings and demonstrate how a possible measurement of these couplings depends on experimental uncertainties, suggesting that the HL-LHC may have the potential to detect and provide a rough measurement of these sizes.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Book Review
Multidisciplinary Sciences
Robert P. Crease
Summary: A story about a friend's intimate observation of a reclusive physicist and his community.
Article
Astronomy & Astrophysics
Waleed Abdallah, Anjan Kumar Barik, Santosh Kumar Rai, Tousik Samui
Summary: We demonstrate the existence of a new hidden gauge symmetry responsible for neutrino mass and dark matter, which can be discovered through scalar mediators. The new force mediator, Z', may have a lower mass compared to the standard gauge bosons, making it undetectable in traditional searches. We propose a novel approach to uncover this symmetry at the Large Hadron Collider by incorporating an existing ATLAS analysis on four-lepton final states, including the Higgs resonance. Additionally, we discuss the introduction of flavor violation in the lepton sector by the hidden sector, which could serve as a significant channel for discovering the new force.
Article
Astronomy & Astrophysics
Jinheung Kim, Soojin Lee, Jeonghyeon Song, Prasenjit Sanyal
Summary: The null results in the new physics searches at the LHC do not exclude the existence of a light fermiophobic particle, particularly in the case of fermiophobic type-I, where the parameter space satisfies multiple theoretical requirements and maintains the stability of the scalar potential at high energy scales.
Article
Astronomy & Astrophysics
Enrique Ramirez, Pablo Roig
Summary: In this study, an exhaustive analysis of lepton flavor violating processes within the simplest little Higgs model is conducted. Discovery of this model could occur through muon to electron conversion in nuclei, muon to electron-gamma decay, or muon to three electron decay. The tau sector may also provide insight into this model through tau to lepton (gamma) and tau to three lepton decays, as well as lepton to tau conversion in nuclei, which shows promise. Despite slightly violating custodial symmetry, accommodating recent CDF M-w measurement is in tension with electroweak precision data.
Article
Physics, Particles & Fields
Daniel de Florian, Ignacio Fabre, Gudrun Heinrich, Javier Mazzitelli, Ludovic Scyboz
Summary: This study combines NLO predictions with full top-quark mass dependence with approximate NNLO predictions for Higgs-boson pair production in gluon fusion. It examines the impact of anomalous couplings on various observables and provides numerical coefficients for the approximate NNLO cross section as a function of the anomalous couplings at root s = 14TeV.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Simone Alioli, Alessandro Broggio, Alessandro Gavardi, Stefan Kallweit, Matthew A. Lim, Riccardo Nagar, Davide Napoletano, Luca Rottoli
Summary: In this paper, the NNLL' resummed 2-jettiness distribution for decays of the Standard Model Higgs boson to a bb-quark pair and to gluons is presented. The calculation relies on a factorisation formula derived using Soft-Collinear Effective Theory, where large logarithms of the 2-jettiness are resummed by renormalisation group evolution. The resummed predictions are matched to the fixed-order NNLO result using the Geneva framework, extending the validity of the results and providing a fully exclusive NNLO event generator matched to the Pythia8 parton shower.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Chichuan Ma, Yuxuan Wang, Xiaofeng Xu, Li Lin Yang, Bin Zhou
Summary: The study focuses on the impact of two-loop corrections on the HW+W- vertex, constructing a canonical basis for the integrals using Baikov representation and intersection theory. By solving epsilon-form differential equations, fully analytic expressions for master integrals are obtained in terms of multiple polylogarithms, allowing for fast and accurate numeric evaluation of arbitrary external momentum configurations. The results are applied to the decay process H -> nu(e)eW and can also be used in Higgs production via W boson fusion.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Yuta Hamada, Kiyoharu Kawana, Adam Scherlis
Summary: The issue of unitarity violation in Higgs inflation with a large non-minimal coupling during preheating has been a recent topic of discussion. The problem can be attributed to a strong coupling problem for the dimensionless effective coupling, which is highly dependent on the choice of higher-dimensional operators. The energy of particles produced during preheating can remain comparable to or below the cutoff scale of the theory, as illustrated in the presence of specific higher-dimensional operators.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Multidisciplinary Sciences
Roberto Franceschini, Mario Greco
Summary: This paper discusses recent research on the physics of the Higgs boson and electroweak symmetry breaking at future muon colliders, outlining the physics case for multi-TeV muon colliders and the potential discoveries beyond the Standard Model.
Article
Physics, Particles & Fields
Vanamali Shastry, Francesco Giacosa
Summary: We investigated the Higgs-Higgs scattering process and the possibility of a Higgs-Higgs bound state (Higgsonium) in Higgs potentials matching the values from the SM. By constructing the unitarized amplitude using different unitarization schemes, we found no Higgsonium state in the SM and determined the scattering lengths at tree-level and upon unitarization. We then extended the calculation for non-SM potentials and explored conditions for the formation of a bound state close to the Higgs-Higgs threshold.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Anisha, Upalaparna Banerjee, Joydeep Chakrabortty, Christoph Englert, Michael Spannowsky
Summary: The study investigates the effects of charged scalar extensions in the Higgs sector of the Standard Model, as well as the EFT couplings of this new state to SM matter. It shows that loop-induced decays of the 125 GeV Higgs boson can clarify the additional states phenomenology. EFT interactions of the charged Higgs can lead to a decreased sensitivity to the virtual presence of charged Higgs states.
Article
Astronomy & Astrophysics
Akanksha Bhardwaja, Christoph Englerta, Robert Hankache, Andrew D. Pilkington
Summary: Improving the sensitivity to CP-violation in the Higgs sector is crucial for the precision Higgs programme at the Large Hadron Collider. Researchers have developed a simple method that directly constructs CP-sensitive observables from neural network outputs, which demonstrates improved sensitivity to CP-violating effects in the production and decay of the Higgs boson compared to traditional angular observables. The kinematic correlations identified by the neural networks can also be utilized to design new analyses based on angular observables, leading to a similar improvement in sensitivity.
Article
Astronomy & Astrophysics
Valerio De Luca, Alex Kehagias, Antonio Riotto
Summary: The study finds that the collapsing regions under the instability of the Standard Model Higgs potential may be harmless in the thin wall approximation. Additionally, the presence of the Standard Model Higgs instability provides a novel mechanism to end inflation and reheat the universe.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Physics, Particles & Fields
Yusaku Kouda, Tadashi Kon, Yoshimasa Kurihara, Takahiro Ueda
Summary: In this study, we extended the GRACE system to incorporate particles and interactions in the Georgi-Machacek model and investigated fermiophobic Higgs boson production processes at e(+)e(-) and e(-)e(-) colliders. The results indicate the advantages of e(+)e(-) colliders in searching for new physics and their complementary role with e(-)e(-) colliders.
EUROPEAN PHYSICAL JOURNAL C
(2022)
