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.

⚛️ lattice

Deciphering the nature of PψsΣP^{\Sigma}_{\psi s} pentaquarks in the light of their electromagnetic multipole moments

This paper utilizes QCD light-cone sum rules to calculate the electromagnetic multipole moments of Σ\Sigma-type strange hidden-charm pentaquarks, revealing distinct magnetic dipole, electric quadrupole, and magnetic octupole signatures that depend on diquark structure and provide key discriminants to differentiate between compact pentaquark and molecular interpretations.

Ulaş Özdem2026-04-15
⚛️ nuclear theory

Open-flavor threshold effects on quarkonium spectrum in the BOEFT

This paper utilizes Born-Oppenheimer effective field theory (BOEFT) to systematically quantify open-flavor threshold effects on the quarkonium spectrum by solving coupled Schrödinger equations with lattice-constrained static potentials, successfully reproducing experimental data and providing a field-theoretical interpretation of the phenomenological 3P0^3P_0 model's pair-creation constant.

Nora Brambilla, Abhishek Mohapatra, Tommaso Scirpa, Antonio Vairo2026-04-15
⚛️ phenomenology

Graviton Production from Inflaton Condensate: Boltzmann vs Bogoliubov

This paper systematically compares Boltzmann and Bogoliubov frameworks for graviton production from an oscillating inflaton condensate, demonstrating that while both methods agree for quadratic potentials at short wavelengths, the Bogoliubov formalism is essential for capturing significant non-adiabatic transition effects in steeper potentials (n>2n>2) that the perturbative Boltzmann approach misses.

Chenhuan Wang, Yong Xu, Wenbin Zhao2026-04-15
⚛️ nuclear theory

Hydrodynamic Initial Conditions in Small Systems from Proton Phase-Space Entropy

This paper proposes that the appropriate initial conditions for hydrodynamic evolution in small collision systems can be derived by coarse-graining the proton's quantum wave function into a semi-classical, positive-definite Wehrl-like entropy, thereby bridging the gap between pure quantum states and the maximally mixed states required by relativistic hydrodynamics.

Gabriel Rabelo-Soares, Gojko Vujanovic, Giorgio Torrieri2026-04-15
⚛️ phenomenology

Probing muon anomaly and lepton flavor violation with scalar leptoquarks in the 331LHN model

This paper extends the 331LHN model by introducing scalar leptoquarks to demonstrate that a singlet leptoquark with a mass between 1.8 and 6 TeV can explain the muon anomalous magnetic moment discrepancy while satisfying constraints from lepton flavor violation and LHC bounds, with a predicted normal hierarchical Yukawa coupling pattern and suppressed current collider signals.

D. T. Binh, V. H. Binh, H. T. Hung, Duong Van Loi2026-04-15
⚛️ high-energy experiments

Ultralight dark matter in long-baseline accelerator neutrino oscillations

This paper systematically analyzes ultralight dark matter effects on neutrino oscillations using T2K and NOν\nuA data, revealing that stochastic fluctuations in the low-mass regime significantly relax coupling constraints while failing to resolve the existing tension in the CP-violating phase δCP\delta_{CP} between the two experiments.

Xin-Qiang Li, Hai-Xing Lin, Jian Tang, Sampsa Vihonen2026-04-14
⚛️ phenomenology

Gravitational Positivity Bounds on Higgs-Portal Dark Matter

This paper derives gravitational positivity bounds for the Higgs-portal scalar dark matter model, revealing that new physics must emerge below 101010^{10} GeV for light dark matter without self-coupling, while heavy dark matter (∼1010\sim 10^{10}–101110^{11} GeV) with specific couplings can satisfy grand unified theory scale constraints and be consistent with the observed relic abundance via the freeze-in mechanism.

Kimiko Yamashita2026-04-14