hep-ex papers | Gist.Science

Hep-Ex explores the fascinating intersection where particle physics meets experimental reality. This field investigates how scientists build massive detectors and accelerate particles to test the fundamental laws of nature, turning abstract theories into measurable data. It is the rigorous process of searching for new particles or forces that could reshape our understanding of the universe, often requiring years of collaboration and engineering.

At Gist.Science, we ensure these discoveries become accessible to everyone. We process every new preprint in this category directly from arXiv, generating both plain-language explanations for curious readers and detailed technical summaries for specialists. Our goal is to bridge the gap between complex experimental results and public understanding without losing scientific nuance.

Below are the latest papers in Hep-Ex, freshly summarized and ready for you to explore.

Partial wave analyses of $ψ(3686)\to p\bar{p}π^0$ and $ψ(3686)\to p\bar{p}η$

Using a large sample of $\psi(3686)$ events collected by the BESIII detector, this study performs partial wave analyses of the decays $\psi(3686)\to p\bar{p}\pi^0$ and $\psi(3686)\to p\bar{p}\eta$ to determine their branching fractions, observe several well-established $N^*$ resonances, and measure the decay width ratio of the $N(1535)$ baryon to $N\eta$ and $N\pi$ final states.

BESIII Collaboration, M. Ablikim, M. N. Achasov, P. Adlarson, O. Afedulidis, X. C. Ai, R. Aliberti, A. Amoroso, Q. An, Y. Bai, O. Bakina, I. Balossino, Y. Ban, H. -R. Bao, V. Batozskaya, K. Begzsuren (…)2026-04-15⚛️ hep-ex

Bring the noise: exact inference from noisy simulations in collider physics

This paper introduces an exact-approximate Markov Chain Monte Carlo method utilizing a novel unbiased Poisson likelihood estimator to achieve exact statistical inferences from noisy Monte Carlo simulations in collider physics, offering robust results at a computational cost comparable to existing approximate methods.

Christopher Chang, Benjamin Farmer, Andrew Fowlie, Anders Kvellestad2026-04-15⚛️ hep-ex

Amplitude analysis of $ψ(3686)\to γK_S^0 K_S^0$

Using a large sample of $\psi(3686)$ events collected by the BESIII detector, this paper presents the first amplitude analysis of the radiative decay $\psi(3686)\to\gamma K_S^0 K_S^0$ , identifying well-established $f_0$ and $f_2$ resonances and determining their production ratios relative to $J/\psi$ decays to provide crucial insights into their internal structure and potential glueball mixing.

BESIII Collaboration, M. Ablikim, M. N. Achasov, P. Adlarson, X. C. Ai, R. Aliberti, A. Amoroso, Q. An, Y. Bai, O. Bakina, Y. Ban, H. -R. Bao, V. Batozskaya, K. Begzsuren, N. Berger, M. Berlowski, M. (…)2026-04-15⚛️ hep-ex

First Measurement of the Decay Dynamics in the Semileptonic Transition of the $D^{+(0)}$ into the Axial-vector Meson $\bar K_1(1270)$

Using 20.3 fb $^{-1}$ of $e^+e^-$ collision data collected by the BESIII detector, this study presents the first measurement of the decay dynamics and branching fractions for the semileptonic transitions $D^{+(0)}\to \bar K_1(1270) e^+ \nu_e$ , including the extraction of hadronic form factors and the setting of upper limits for the $K_1(1400)$ channel.

Combined Evidence for the $X_{17}$ Boson After PADME Results on Resonant Production in Positron Annihilation

This paper combines the recent $1.77\sigma$ excess observed by the PADME experiment in positron annihilation with previous nuclear transition anomalies to strengthen the case for a common $X_{17}$ boson origin, yielding a refined mass measurement of $16.88 \pm 0.05\,\text{MeV}$ that significantly reduces uncertainty compared to nuclear physics determinations alone.

Fernando Arias-Aragón, Giovanni Grilli di Cortona, Enrico Nardi, Claudio Toni2026-04-15⚛️ nucl-ex

Measurement of coherent exclusive $J/\psi\to\mu^+\mu^-$ production in ultraperipheral Pb+Pb collisions at $\sqrt{s_{\textrm{NN}}}=5.36$ TeV with the ATLAS detector

The ATLAS experiment measured the differential cross sections of coherent exclusive $J/\psi \to \mu^+\mu^-$ production in ultraperipheral Pb+Pb collisions at $\sqrt{s_{\textrm{NN}}}=5.36$ TeV using 2023 data, finding results consistent with theoretical predictions but in tension with previous Run-2 measurements in the central rapidity region.

ATLAS Collaboration2026-04-15⚛️ nucl-ex

Study of the Magnetic Dipole Transition of $J/ψ\toγη_c$ via $η_c\to p\bar{p}$

Using a large sample of $J/\psi$ events collected by the BESIII detector, this study presents the first amplitude analysis of $J/\psi\to\gamma p\bar{p}$ in the $\eta_c$ mass region to precisely determine the product branching fraction and subsequently derive the individual branching fractions for $J/\psi\to\gamma\eta_c$ and $\eta_c\to\gamma\gamma$ , which are found to be consistent with recent lattice quantum chromodynamics calculations.

Phenomenology of Non-Abelian Gauge and Goldstone Bosons in a U(2) Flavor Model

This paper investigates the phenomenology of pseudo-Nambu-Goldstone bosons and light gauge bosons arising from the $SU(2)_F$ subgroup of a $U(2)_F$ flavor model, demonstrating that their unsuppressed flavor-violating couplings allow low-energy flavor experiments to probe symmetry breaking scales up to $10^{12}$ GeV, surpassing current astrophysical limits.

Lorenzo Calibbi, Jiangyi Yi2026-04-15⚛️ hep-ex

Study of time-like electromagnetic form factors of $\Lambda,~\Sigma$ and $\Xi^{+}$ in light-front quark model

This paper employs a light-front quark model based on the Bethe-Salpeter formalism to calculate the time-like electromagnetic form factors of $\Lambda$ , $\Sigma$ , and $\Xi$ hyperons, demonstrating that the results, including effective form factors and the ratio of electric to magnetic form factors at specific $q^2$ values, closely match experimental data from the BESIII collaboration.

Chong-Chung Lih, Chao-Qiang Geng2026-04-15⚛️ hep-ex

POEMMA-Balloon with Radio: A multi-messenger, multi-detector balloon payload

This paper summarizes the design and expected performance of the POEMMA-Balloon with Radio (PBR), a multi-messenger, balloon-borne payload that combines optical and radio detectors to validate space-based fluorescence detection strategies, study ultra-high-energy cosmic rays above the PeV scale, and search for very-high-energy neutrinos in preparation for the future POEMMA satellite mission.

J. Adams, J. Alfaro, D. Allard, P. Alldredge, R. Aloisio, R. Ammendola, A. Anastasio, L. Anchordoqui, D. Badoni, J. Baláž, B. Baret, L. Bar-On, M. Battisti, R. Bellotti, M. Bertaina, M. Betts, S (…)2026-04-15⚛️ hep-ex

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hep-ex

Partial wave analyses of ψ(3686)→ppˉπ0ψ(3686)\to p\bar{p}π^0ψ(3686)→ppˉ​π0 and ψ(3686)→ppˉηψ(3686)\to p\bar{p}ηψ(3686)→ppˉ​η

Bring the noise: exact inference from noisy simulations in collider physics

Amplitude analysis of ψ(3686)→γKS0KS0ψ(3686)\to γK_S^0 K_S^0 ψ(3686)→γKS0​KS0​

First Measurement of the Decay Dynamics in the Semileptonic Transition of the D+(0)D^{+(0)}D+(0) into the Axial-vector Meson Kˉ1(1270)\bar K_1(1270)Kˉ1​(1270)

Combined Evidence for the X17X_{17}X17​ Boson After PADME Results on Resonant Production in Positron Annihilation

Measurement of coherent exclusive J/ψ→μ+μ−J/\psi\to\mu^+\mu^-J/ψ→μ+μ− production in ultraperipheral Pb+Pb collisions at sNN=5.36\sqrt{s_{\textrm{NN}}}=5.36sNN​​=5.36 TeV with the ATLAS detector

Study of the Magnetic Dipole Transition of J/ψ→γηcJ/ψ\toγη_cJ/ψ→γηc​ via ηc→ppˉη_c\to p\bar{p}ηc​→ppˉ​