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.

Resonance $X(6600)$

This paper utilizes QCD sum rule methods to model the resonance $X(6600)$ as a $2^{++}$ all-charm tetraquark in a diquark-antidiquark configuration, calculating its mass and decay widths to demonstrate consistency with experimental data and support its interpretation as a tensor state.

S. S. Agaev, K. Azizi, H. Sundu2026-04-14⚛️ hep-lat

Novel analysis for the energy-energy correlation in electron-positron annihilation in the perturbative domain

This paper presents a novel analysis of the energy-energy correlation in electron-positron annihilation using the Principle of Maximum Conformality to eliminate renormalization ambiguities, resulting in a dynamically varying scale that yields perturbative predictions in excellent agreement with experimental data.

Zhu-Yu Ren, Sheng-Quan Wang, Jian-Ming Shen, Xing-Gang Wu, Leonardo Di Giustino, Philip G. Ratcliffe, Stanley J. Brodsky2026-04-14⚛️ hep-ph

Search for a new heavy resonance decaying to a top quark and a neutral scalar boson in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Using 138 fb $^{-1}$ of 13 TeV proton-proton collision data from the CMS detector, this study presents the first fully hadronic search for a heavy vector-like top quark ( $\mathrm{T}'$ ) decaying to a top quark and a neutral scalar boson ( $\phi \to b\bar{b}$ ), setting the most stringent limits to date on $\mathrm{T}'$ masses above 2 TeV and excluding masses between 0.85 and 1.3 TeV for a standard model Higgs boson scenario without observing any significant excess over background predictions.

CMS Collaboration2026-04-14⚛️ hep-ex

A search for microscopic black holes, string balls, and sphalerons in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Using 138 fb⁻¹ of proton-proton collision data at 13 TeV collected by the CMS detector, this study presents model-independent and model-dependent searches that exclude semiclassical black holes and string balls with masses below approximately 8.4–11.4 TeV and 9.0–10.7 TeV, respectively, while setting a 95% confidence level upper limit of 0.0034 on the fraction of quark-quark interactions producing electroweak sphalerons above 9 TeV.

CMS Collaboration2026-04-14⚛️ hep-ex

Study of doubly heavy baryon lifetimes

This paper investigates the lifetimes and inclusive semileptonic decay widths of doubly heavy baryons using the heavy quark expansion with next-to-leading-order corrections and bag model matrix elements, predicting specific lifetime hierarchies and highlighting the crucial role of $W$ -exchange contributions in explaining the large lifetime splitting observed in the doubly charmed sector.

Hai-Yang Cheng, Chia-Wei Liu2026-04-14⚛️ hep-ph

Study of $\chi_{cJ}\to \eta \eta \eta^\prime$ via intermediate charmed meson loop mechanisms and its implications for non-observation of $\eta_1(1855)$ in $\chi_{cJ}$ decays

This study employs an effective Lagrangian approach with charmed meson loop mechanisms to successfully reproduce the BESIII experimental branching fractions and invariant mass spectra for $\chi_{cJ} \to \eta \eta \eta^\prime$ decays, thereby offering a theoretical explanation for the absence of the $\eta_1(1855)$ signal in these channels.

Xin-Ru Wang, Shu-Qi Wang, Shi-Dong Liu, Qi Wu, Gang Li, Ju-Jun Xie2026-04-14⚛️ hep-ph

Search for proton decay via $p \to e^{+}\pi^{0}\pi^{0}$ and $p \to \mu^{+}\pi^{0}\pi^{0}$ in 0.401 megaton-years exposure of Super-Kamiokande I-V

Using 0.401 megaton-years of data from Super-Kamiokande I-V, this study conducted the first search for the proton decay modes $p \to e^{+}\pi^{0}\pi^{0}$ and $p \to \mu^{+}\pi^{0}\pi^{0}$ , finding no significant signal above background and establishing new lower limits on their lifetimes that exceed previous experimental results by more than an order of magnitude.

Kamiokande Collaboration, K. Abe, S. Abe, Y. Asaoka, M. Harada, Y. Hayato, K. Hiraide, T. H. Hung, K. Hosokawa, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Mi (…)2026-04-14⚛️ hep-ex

Measurement of inclusive production of charmonium states in $b$ -hadron decays via their decay into $\phi \phi$

Using LHCb Run 2 data, this study measures the inclusive production branching fractions of $\chi_{c0}$ , $\chi_{c1}$ , and $\chi_{c2}$ charmonium states in $b$ -hadron decays via their $\phi\phi$ decay mode, reports the production rate of $\eta_c(2S)$ , and achieves the most precise measurement to date of the $\eta_c(1S)$ mass.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. Adefisoye, B. Adeva, M. Adinolfi, P. Adlarson, C. Agapopoulou, C. A. Aidala, Z. Ajaltouni, S. (…)2026-04-14⚛️ hep-ex

Observation of the charmless purely baryonic decay $\Lambda_b^{0} \to \Lambda p \bar{p}$ at LHCb

Using the full Run 2 LHCb dataset, the first observation of the charmless purely baryonic decay $\Lambda_b^{0} \to \Lambda p \bar{p}$ is reported with a statistical significance of $5.1\sigma$ , yielding a measured relative branching fraction of $(5.13 \pm 1.28_{\rm stat} \pm 0.27_{\rm syst})\times 10^{-2}$ .

Alexande Brea Rodriguez2026-04-14⚛️ hep-ex

Searching for apparent baryon number violation in $\Lambda_c^+$ decays at the Super Tau-Charm Facility

This paper proposes and evaluates a dedicated search for apparent baryon number violation in $\Lambda_c^+$ decays at the Super Tau-Charm Facility, demonstrating that with 1 ab $^{-1}$ of integrated luminosity, the facility can probe new-physics scales of several TeV and constrain R-parity-violating supersymmetry parameters through model-independent sensitivity studies and theoretical interpretations.

Zeren Simon Wang, Xin-Ru Tang, Yu Zhang, Yu Zhang, Xiaorong Zhou2026-04-14⚛️ hep-ph

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hep-ex

Resonance X(6600)X(6600)X(6600)

Novel analysis for the energy-energy correlation in electron-positron annihilation in the perturbative domain

Search for a new heavy resonance decaying to a top quark and a neutral scalar boson in proton-proton collisions at s\sqrt{s}s​ = 13 TeV

A search for microscopic black holes, string balls, and sphalerons in proton-proton collisions at s\sqrt{s}s​ = 13 TeV

Study of doubly heavy baryon lifetimes

Study of χcJ→ηηη′\chi_{cJ}\to \eta \eta \eta^\primeχcJ​→ηηη′ via intermediate charmed meson loop mechanisms and its implications for non-observation of η1(1855)\eta_1(1855)η1​(1855) in χcJ\chi_{cJ}χcJ​ decays

Search for proton decay via p→e+π0π0p \to e^{+}\pi^{0}\pi^{0}p→e+π0π0 and p→μ+π0π0p \to \mu^{+}\pi^{0}\pi^{0}p→μ+π0π0 in 0.401 megaton-years exposure of Super-Kamiokande I-V

Measurement of inclusive production of charmonium states in bbb-hadron decays via their decay into ϕϕ\phi \phiϕϕ

Observation of the charmless purely baryonic decay Λb0→Λppˉ\Lambda_b^{0} \to \Lambda p \bar{p}Λb0​→Λppˉ​ at LHCb

Searching for apparent baryon number violation in Λc+\Lambda_c^+Λc+​ decays at the Super Tau-Charm Facility