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Physics#Higgs Physics, 2HDM🔬 ResearchAnalyzed: Jan 3, 2026 08:37

Correlating Resonant Di-Higgs and Tri-Higgs Production in 2HDM

Published:Dec 31, 2025 13:56
1 min read
ArXiv

Analysis

This paper investigates the Two-Higgs-Doublet Model (2HDM) and explores correlations between different Higgs boson production processes. The key finding is a relationship between the branching ratios of H decaying to hh and VV, and the potential for measuring tri-Higgs production at the High-Luminosity LHC. This is significant because it provides a way to test the 2HDM and potentially discover new heavy scalars.

Key Takeaways

Reference

For heavy scalar masses between 500 GeV and 1 TeV, we find that Br($H\to hh$)/ Br($H\to ZZ)\approx 9.5.

Probing Dark Jets from Higgs Decays at LHC

Published:Dec 31, 2025 12:00
1 min read
ArXiv

Analysis

This paper explores a novel search strategy for dark matter, focusing on a specific model where the Higgs boson decays into dark sector particles that subsequently produce gluon-rich jets. The focus on long-lived dark mesons decaying into gluons and the consideration of both cascade decays and dark showers are key aspects. The paper highlights the importance of trigger selection for detection and provides constraints on the branching ratios at the high-luminosity LHC.
Reference

The paper finds that appropriate trigger selection constitutes a crucial factor for detecting these signal signatures in both tracker system and CMS muon system. At the high-luminosity LHC, the exotic Higgs branching ratio to cascade decays (dark showers) can be constrained below $\mathcal{O}(10^{-5}-10^{-1})$ [$\mathcal{O}(10^{-5}-10^{-2})$] for dark meson proper lifetimes $c\tau$ ranging from $1$ mm to $100$ m.

Analysis

This paper presents a search for charged Higgs bosons, a hypothetical particle predicted by extensions to the Standard Model of particle physics. The search uses data from the CMS detector at the LHC, focusing on specific decay channels and final states. The results are interpreted within the generalized two-Higgs-doublet model (g2HDM), providing constraints on model parameters and potentially hinting at new physics. The observation of a 2.4 standard deviation excess at a specific mass point is intriguing and warrants further investigation.
Reference

An excess is observed with respect to the standard model expectation with a local significance of 2.4 standard deviations for a signal with an H$^\pm$ boson mass ($m_{\mathrm{H}^\pm}$) of 600 GeV.

FASER for Compressed Higgsinos

Published:Dec 30, 2025 17:34
1 min read
ArXiv

Analysis

This paper explores the potential of the FASER experiment to detect compressed Higgsinos, a specific type of supersymmetric particle predicted by the MSSM. The focus is on scenarios where the mass difference between the neutralino and the lightest neutralino is very small, making them difficult to detect with standard LHC detectors. The paper argues that FASER, a far-forward detector at the LHC, can provide complementary coverage to existing search strategies, particularly in a region of parameter space that is otherwise challenging to probe.

Key Takeaways

Reference

FASER 2 could cover the neutral Higgsino mass up to about 130 GeV with mass splitting between 4 to 30 MeV.

D*π Interaction and D1(2420) in B-Decays

Published:Dec 30, 2025 17:28
1 min read
ArXiv

Analysis

This paper attempts to model the D*π interaction and its impact on the D1(2420) resonance observed in B-meson decays. It aims to reproduce experimental data from LHCb, focusing on the invariant mass distribution of the D*π system. The paper's significance lies in its use of coupled-channel meson-meson interactions to understand the underlying dynamics of D1(2420) and its comparison with experimental results. It also addresses the controversy surrounding the D*π scattering length.
Reference

The paper aims to reproduce the differential mass distribution for the D*π system in B-decays and determine the D*π scattering length.

Dark Matter and Leptogenesis Unified

Published:Dec 30, 2025 07:05
1 min read
ArXiv

Analysis

This paper proposes a model that elegantly connects dark matter and the matter-antimatter asymmetry (leptogenesis). It extends the Standard Model with new particles and interactions, offering a potential explanation for both phenomena. The model's key feature is the interplay between the dark sector and leptogenesis, leading to enhanced CP violation and testable predictions at the LHC. This is significant because it provides a unified framework for two of the biggest mysteries in modern physics.
Reference

The model's distinctive feature is the direct connection between the dark sector and leptogenesis, providing a unified explanation for both the matter-antimatter asymmetry and DM abundance.

Strong Coupling Constant Determination from Global QCD Analysis

Published:Dec 29, 2025 19:00
1 min read
ArXiv

Analysis

This paper provides an updated determination of the strong coupling constant αs using high-precision experimental data from the Large Hadron Collider and other sources. It also critically assesses the robustness of the αs extraction, considering systematic uncertainties and correlations with PDF parameters. The paper introduces a 'data-clustering safety' concept for uncertainty estimation.
Reference

αs(MZ)=0.1183+0.0023−0.0020 at the 68% credibility level.

2HDMs with Gauged U(1): Alive or Dead?

Published:Dec 29, 2025 13:16
1 min read
ArXiv

Analysis

This paper investigates Two Higgs Doublet Models (2HDMs) with an additional U(1) gauge symmetry, exploring their phenomenology and constraints from LHC data. The authors find that the simplest models are excluded by four-lepton searches, but introduce vector-like fermions to evade these constraints. They then analyze specific benchmark models (U(1)_H and U(1)_R) and identify allowed parameter space, suggesting future collider experiments can further probe these models.
Reference

The paper finds that the minimum setup of these 2HDMs has been excluded by current data for four lepton searches at LHC. However, introducing vector-like fermions can avoid these constraints.

Analysis

This paper explores the production of $J/ψ$ mesons in ultraperipheral heavy-ion collisions at the LHC, focusing on azimuthal asymmetries arising from the polarization of photons involved in the collisions. It's significant because it provides a new way to test the understanding of quarkonium production mechanisms and probe the structure of photons in extreme relativistic conditions. The study uses a combination of theoretical frameworks (NRQCD and TMD photon distributions) to predict observable effects, offering a potential experimental validation of these models.
Reference

The paper predicts sizable $\cos(2φ)$ and $\cos(4φ)$ azimuthal asymmetries arising from the interference of linearly polarized photon states.

Analysis

This paper presents an extension to the TauSpinner program, a Monte Carlo tool, to incorporate spin correlations and New Physics effects, specifically focusing on anomalous dipole and weak dipole moments of the tau lepton in the process of tau pair production at the LHC. The ability to simulate these effects is crucial for searching for physics beyond the Standard Model, particularly in the context of charge-parity violation. The paper's focus on the practical implementation and the provision of usage information makes it valuable for experimental physicists.
Reference

The paper discusses effects of anomalous contributions to polarisation and spin correlations in the $\bar q q \to \tau^+ \tau^-$ production processes, with $\tau$ decays included.

Analysis

This paper explores the potential for observing lepton number violation (LNV) at the Large Hadron Collider (LHC) within a specific theoretical framework (Zee Model with leptoquarks). The significance lies in its potential to directly test LNV, which would confirm the Majorana nature of neutrinos, a fundamental aspect of particle physics. The study provides a detailed collider analysis, identifying promising signal channels and estimating the reach of the High-Luminosity LHC (HL-LHC).
Reference

The HL-LHC can probe leptoquark masses up to $m_{ m LQ} \sim 1.5~\mathrm{TeV}$ with this process.

Analysis

This paper explores the unification of gauge couplings within the framework of Gauge-Higgs Grand Unified Theories (GUTs) in a 5D Anti-de Sitter space. It addresses the potential to solve Standard Model puzzles like the Higgs mass and fermion hierarchies, while also predicting observable signatures at the LHC. The use of Planck-brane correlators for consistent coupling evolution is a key methodological aspect, allowing for a more accurate analysis than previous approaches. The paper revisits and supplements existing results, including brane masses and the Higgs vacuum expectation value, and applies the findings to a specific SU(6) model, assessing the quality of unification.
Reference

The paper finds that grand unification is possible in such models in the presence of moderately large brane kinetic terms.

Precise Baryogenesis in Extended Higgs Sector

Published:Dec 26, 2025 16:51
1 min read
ArXiv

Analysis

This paper investigates baryogenesis within a 2HDM+a model, offering improved calculations of the baryon asymmetry. It highlights the model's testability through LHC searches and flavor measurements, making it a promising area for future experimental verification. The paper's focus on precise calculations and testable predictions is significant.
Reference

The improved predictions for the baryon asymmetry find that it is rather suppressed compared to earlier predictions, requiring larger mixing between the singlet and 2HDM pseudoscalars and hence leading to a more easily testable model at colliders.

Radiative Charged Higgs Vertices in 3HDMs

Published:Dec 25, 2025 18:41
1 min read
ArXiv

Analysis

This paper investigates the radiative corrections to charged Higgs boson interactions in three Higgs doublet models (3HDMs). It focuses on the $H^+ W^- Z$ vertex, calculating it in different 3HDM types and comparing them to 2HDMs. The paper also explores the potential for detecting these interactions at the LHC via vector boson fusion (VBF), suggesting a possible smoking gun signal for 3HDMs.
Reference

The results also indicate a sizeable increment ($\sim 100\%$) over the corresponding form factors in 2HDMs. In addition, we probe the $H_{1,2}^+ W^- Z$ vertices at the 14 TeV LHC using vector boson fusion (VBF).

ANN for Diffractive J/ψ Production at HERA

Published:Dec 25, 2025 14:56
1 min read
ArXiv

Analysis

This paper uses an Artificial Neural Network (ANN) to analyze data from the HERA experiment on coherent diffractive J/ψ production. The authors aim to provide a model-independent analysis, overcoming limitations of traditional model-dependent approaches. They predict differential cross-sections and extend the model to include LHC data, extracting the exponential slope 'b' and analyzing its dependence on kinematic variables. This is significant because it offers a new, potentially more accurate, way to analyze high-energy physics data and extract physical parameters.
Reference

The authors find that the exponential slope 'b' strongly depends on $Q^2$ and $W$.

Analysis

This article likely investigates the influence of a specific hadronic interaction model (EPOS.LHC-R) on the understanding of ultrahigh-energy cosmic rays originating from Centaurus A. The research focuses on how the model affects the simulation and interpretation of these cosmic rays, potentially impacting our understanding of their origin and propagation.

Key Takeaways

    Reference

    Research#physics🔬 ResearchAnalyzed: Jan 4, 2026 09:27

    CT25: Progress toward next-generation PDFs for precision phenomenology at the LHC

    Published:Dec 22, 2025 19:00
    1 min read
    ArXiv

    Analysis

    This article reports on advancements in the development of next-generation PDFs (Parton Distribution Functions) for high-precision physics analysis at the Large Hadron Collider (LHC). The focus is on improving the accuracy of theoretical predictions for particle collisions, which is crucial for interpreting experimental results and searching for new physics. The use of 'precision phenomenology' suggests a focus on detailed and accurate modeling of particle interactions.
    Reference

    Research#Physics🔬 ResearchAnalyzed: Jan 10, 2026 09:23

    Probing the Dynamical Scotogenic Model at the LHC

    Published:Dec 19, 2025 18:59
    1 min read
    ArXiv

    Analysis

    This article explores the potential of the Large Hadron Collider (LHC) to investigate the dynamical scotogenic model, a theoretical framework for explaining neutrino masses and dark matter. The study's significance lies in its examination of experimental feasibility, potentially providing insights into fundamental physics.
    Reference

    The context provided suggests that the article is based on a paper from ArXiv, a repository for scientific preprints.

    Research#Particle Physics🔬 ResearchAnalyzed: Jan 10, 2026 09:25

    Investigating Electroweak Production of Heavy Neutral Leptons at LHC

    Published:Dec 19, 2025 17:58
    1 min read
    ArXiv

    Analysis

    This article discusses the exploration of physics beyond the Standard Model through the search for heavy neutral leptons. The study focuses on using the Large Hadron Collider to identify displaced vertices, which could indicate the decay of these particles.
    Reference

    The article focuses on probing electroweak pair production of heavy neutral leptons with displaced vertices at the LHC.

    Research#Particle Physics🔬 ResearchAnalyzed: Jan 10, 2026 09:25

    ATLAS Searches for ttbar Resonances in Proton-Proton Collisions

    Published:Dec 19, 2025 17:58
    1 min read
    ArXiv

    Analysis

    This article reports on a high-energy physics experiment searching for new particles using data from the Large Hadron Collider. The analysis focuses on specific final states, offering insights into potential beyond-the-Standard-Model physics.
    Reference

    The analysis uses 140 fb$^{-1}$ of pp collision data at $\sqrt{s}=13$ TeV with the ATLAS experiment.

    Research#llm🔬 ResearchAnalyzed: Jan 4, 2026 07:21

    SPIDER, a Waveform Digitizer ASIC for picosecond timing in LHCb PicoCal

    Published:Dec 19, 2025 08:52
    1 min read
    ArXiv

    Analysis

    This article announces the development of SPIDER, an Application-Specific Integrated Circuit (ASIC) designed for precise timing measurements in the LHCb PicoCal detector. The focus is on achieving picosecond timing resolution, crucial for the experiment's physics goals. The source, ArXiv, indicates this is a pre-print or research paper.
    Reference

    Science#Particle Physics📝 BlogAnalyzed: Dec 29, 2025 17:37

    Harry Cliff: Particle Physics and the Large Hadron Collider

    Published:Apr 29, 2020 22:52
    1 min read
    Lex Fridman Podcast

    Analysis

    This article summarizes a podcast episode featuring particle physicist Harry Cliff. The episode focuses on Cliff's work at the University of Cambridge and the Large Hadron Collider (LHC), specifically his research on beauty quarks to find new particles and forces. The article highlights Cliff's ability to communicate complex scientific concepts clearly. It also provides links to the podcast, Cliff's website and social media, and the episode's outline. The article promotes the podcast and its sponsors.
    Reference

    Harry Cliff is an exceptional communicator of science with some of the clearest and most captivating explanations of basic concepts in particle physics I’ve ever heard.