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

Asteroid-mass Primordial Black Holes as Dark Matter from Supersymmetry

This paper demonstrates that supersymmetric extensions of the Standard Model can facilitate the formation of asteroid-mass Primordial Black Holes as a viable dark matter candidate by transiently softening the early Universe's equation of state, a mechanism that remains consistent with observational constraints for heavy supersymmetric masses but fails within the Standard Model.

Andrea Boccia, Marco Chianese2026-04-30
⚛️ phenomenology

Time-of-Flight Constraints on Neutrino Millicharge from Supernova Neutrinos in Galactic Magnetic Fields

This paper proposes a framework to reinterpret supernova time-of-flight limits on neutrino mass as constraints on neutrino millicharge by leveraging their shared Eν−2E_\nu^{-2} energy dependence, deriving bounds ranging from ∼10−17 e\sim 10^{-17}\, e for SN1987A to ∼10−20 e\sim 10^{-20}\, e for future Galactic supernovae using a line-of-sight-dependent magnetic delay kernel.

Pedro Dedin Neto, AmirFarzan Esmaeili, Guilherme A. Nogueira, Pedro Cunha de Holanda, Ernesto Kemp2026-04-30
⚛️ phenomenology

Recent Developments in IR-Improved Amplitude-Based Resummation in Precision High Energy Collider Physics

This paper presents recent advancements in precision high-energy collider physics by applying IR-improvement techniques to unintegrable infrared singularities through amplitude-based resummation within the Standard Model framework, offering new results and identifying emerging issues for observables at facilities such as the LHC, FCC, and various future lepton colliders.

B. F. L. Ward (Baylor University, Waco, TX, USA), S. Jadach (Institute of Nuclear Physics, Krakow, PL), W. Placzek (Jagi (…)2026-04-30
🔬 atomic physics

Precision Spectroscopy of 2S-nS Transitions in Atomic Hydrogen: A Determination of the Proton Charge Radius

This paper reports high-precision absolute frequency measurements of 2S-nS (n=8, 9, 10) two-photon transitions in cryogenic atomic hydrogen, yielding a proton charge radius of 0.8433(31) fm and a Rydberg frequency that align well with CODATA 2022 recommendations.

R. G. Bullis, W. L. Tavis, M. R. Weiss, J. Orellana Cisneros, A. J. Cheeseman, U. D. Jentschura, D. C. Yost2026-04-30
⚛️ phenomenology

The End of the First Act: Spectral Running, Interacting Dark Radiation, and the Hubble Tension in Light of ACT DR6 Data

This article demonstrates that extending the standard model of cosmology with self-interacting dark radiation and a running spectral index function during inflation significantly relaxes constraints on additional relativistic degrees of freedom and reduces the Hubble tension to below 2σ\sigma when confronted with data from ACT DR6, Planck, DESI DR2, and Pantheon+.

Mathias Garny, Florian Niedermann, Martin S. Sloth2026-04-30
⚛️ nuclear theory

Thermal and geometric normal modes of spectral fluctuations in heavy-ion collisions

This contribution employs principal component analysis to decompose event-by-event spectral fluctuations in heavy-ion collisions into distinct thermal and geometric normal modes, establishing a physical analogy to molecular vibrations that explains key experimental observables such as v0(pT)v_0(p_T) and the sign change at low pTp_T in v02(pT)v_{02}(p_T).

Rupam Samanta2026-04-30