Hep-Ph explores the fundamental forces that govern how particles interact and behave at the smallest scales imaginable. This field bridges the gap between theoretical predictions and experimental reality, helping scientists understand the building blocks of our universe without getting lost in complex mathematics. Whether investigating the Higgs boson or searching for new physics beyond current models, these studies push the boundaries of human knowledge about matter and energy.

At Gist.Science, we process every new preprint in this category as soon as it appears on arXiv. We strip away the dense jargon to offer both accessible plain-language explanations and detailed technical summaries, ensuring that groundbreaking research is understandable to everyone from students to seasoned experts. Below are the latest papers in this dynamic field, ready for you to explore with clarity and depth.

⚛️ phenomenology

Primary Decompositions in Lorentz-Covariant Rings

This paper addresses the computational challenges of primary decompositions in Lorentz-covariant rings for scattering amplitudes by proposing a covariance-preserving solution based on fitting ansätze in special kinematic limits, alongside improved semi-numerical algorithms for variety analysis, and applying these methods to derive new codimension-two decompositions for five-point massless and one-mass amplitudes.

Giuseppe De Laurentis, David Tai2026-09-29
⚛️ nuclear theory

Global equilibrium at order O(ℏ2)\mathcal{O}(\hbar^2): pseudo-gauge ambiguity, Maxwell relations, and thermodynamic consistency

This paper investigates massive spin-1/2 particles in global thermodynamic equilibrium with rotation and acceleration up to order O(ℏ2)\mathcal{O}(\hbar^2), demonstrating that while global observables are pseudo-gauge independent, local quantities and thermodynamic consistency (specifically the validity of Maxwell relations) depend on the chosen pseudo-gauge, thereby favoring the kinetic-theory pseudo-gauge for applications like spin hydrodynamics.

Asaad Daher, David Wagner, Masoud Shokri, Dirk H. Rischke2026-09-29
⚛️ phenomenology

Impact of Helicity-Isospin Convention Matching on the Extraction of α\alpha from B0→(ρπ)0B^0\to(\rho\pi)^0

This paper demonstrates that correcting a mismatch between helicity and isospin conventions in the analysis of B0→(ρπ)0B^0\to(\rho\pi)^0 decays reduces the tension between the direct and indirect determinations of the unitarity-triangle angle α\alpha from 2.9σ2.9\sigma to 2.1σ2.1\sigma, yielding a revised direct measurement of α=(87.0−4.7+11.8)∘\alpha = (87.0^{+11.8}_{-4.7})^\circ.

Radek Žlebčík2026-09-29
⚛️ phenomenology

Neutrino Direct Simulation Monte Carlo: Accurate modeling of out-of-equilibrium decaying cosmological relics

This paper extends the Neutrino Direct Simulation Monte Carlo (ν\nuDSMC) framework to jointly model decaying cosmological relics, neutrino transport, and Big Bang nucleosynthesis, demonstrating that this efficient and comprehensive approach outperforms traditional approximations by accurately capturing nonthermal effects that significantly impact cosmological predictions.

Kensuke Akita, Miguel Escudero, Oleksii Ihnatenko, Maksym Ovchynnikov2026-09-29
⚛️ phenomenology

Disentangling VudV_{ud} from New Physics in Beta Decays with the FCC-ee

This paper demonstrates that while current and future high-energy collider data (HL-LHC) only partially resolve the degeneracy between the CKM element VudV_{ud} and New Physics in superallowed β\beta-decays, the FCC-ee will fully disentangle them, restoring SM-level precision for VudV_{ud} and significantly tightening constraints on SMEFT Wilson coefficients.

Lemonia Gialidi, Elie Hammou, Kamil Laurent, Vaisakh Plakkot, Juan Rojo, Jordy de Vries2026-09-29
⚛️ phenomenology

Prompting Particle Physics: Tokenized Multi-modal Foundation Models for Combinatorially Many Tasks

This paper introduces a tokenized multi-modal foundation model that unifies various collider reconstruction and simulation tasks into a single framework, enabling the generation of diverse intermediate physics objects through flexible prompt-based modality mapping while achieving state-of-the-art performance and Geant4-level fidelity.

Nilotpal Kakati, Daniel Murnane, Baran Hashemi, Samuel Klein, Jeffrey Krupa, Eilam Gross, Lukas Heinrich, Michael Kagan2026-09-29
⚛️ phenomenology

Escaping Solar Capture: Majoron mediated Elastic Dark Matter for the LZ 248~keV Event

This paper proposes that the 248 keV nuclear-recoil event observed by LZ can be explained by Majoron-mediated elastic dark matter scattering, a mechanism that naturally links neutrino mass generation to the signal while simultaneously reproducing the observed thermal relic abundance and suppressing solar capture through specific spin and kinematic properties.

Salvador Centelles Chuliá, Ayan Chattaraj, Rahul Srivastava, Surabhi Srivastava2026-09-29