Precise measurements of Higgs decays into quarks and gluons are essential for probing the Yukawa couplings of the Higgs boson and testing the flavor structure of the Standard Model. We investigate the process $\textit{e}$ $\textit{e}$ → $\textit{ZH}$ at $$ \sqrt{s} $$ = 240 GeV at a future $\textit{e}$ $\textit{e}$ Higgs factory, taking the CEPC design as a benchmark. The analysis focuses on events with $$ Z\to \nu \overline{\nu} $$ and hadronic Higgs decays $$ H\to b\overline{b} $$ , $$ c\overline{c} $$ , $$ s\overline{s} $$ and $\textit{gg}$. Jet flavor is identified using state-of-the-art particle-level deep neural network taggers (ParticleNet, Particle Transformer and More-Interaction Particle Transformer), whose per-jet outputs are combined with global event observables in a two-stage analysis employing XGBoost classifiers to separate the four Higgs decay modes from the dominant two- and four-fermion Standard Model backgrounds. Assuming an integrated luminosity of 20 ab , we obtain projected relative precision on $\textit{σ}$($\textit{ZH}$) × Br($\textit{H}$ → $\textit{X}$) of 0.17% for $\textit{X}$ = $$ b\overline{b} $$ , 1.06% for $$ c\overline{c} $$ , 0.50% for $\textit{gg}$ and 68% for $$ s\overline{s} $$ . Compared with the CEPC published results, the precisions for $$ H\to c\overline{c} $$ and $\textit{H}$ → $\textit{gg}$ are improved by about 43% and 29%, respectively. For $$ H\to s\overline{s} $$ we present a quantitative sensitivity estimation corresponding to a statistical significance of about 1.5$\textit{σ}$. These results highlight the potential of deep-learning-based jet flavor tagging for precision studies of Higgs decays at future $\textit{e}$ $\textit{e}$ Higgs factories.

China

Xinzhu Wang

Yifan Zhu

Chunxiang Zhu

Jianfeng Jiang

Manqi Ruan

Kun Wang

Haijun Yang

Yongfeng Zhu

Deep-learning jet flavor tagging for precision hadronic Higgs measurements at future $\textit{e}$ + $\textit{e}$ − Higgs factories

We compute the complete two-loop unrenormalized electroweak corrections to the Higgsstrahlung process <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>e</mi><mo>+</mo></msup><msup><mi>e</mi><mo>−</mo></msup><mo stretchy="false">→</mo><mi>H</mi><mi>Z</mi></math> at future Higgs factories. Our result for a given center-of-mass energy is expressed as a piecewise function defined by several deeply expanded power series, which has high precision and can be further manipulated efficiently. We find that the finite part of the unrenormalized two-loop electroweak corrections can contribute a few thousandths, which might indicate their importance to match the precision of future Higgs factories. This work represents the first complete calculation of the unrenormalized two-loop electroweak corrections for processes with four external particles.

Xiang Chen

Xin Guan

Chuan-Qi He

Zhao Li

United Kingdom

Xiao Liu

Yan-Qing Ma

Complete two-loop unrenormalized electroweak corrections to <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>e</mi><mo>+</mo></msup><msup><mi>e</mi><mo>−</mo></msup><mo stretchy="false">→</mo><mi>H</mi><mi>Z</mi></math>

The next generation of electron–positron colliders will require unprecedented precision in both theory and experiment. Sophisticated software frameworks are essential to evaluate detector concepts, optimize designs, and simulating physical processes. In this context, Monte Carlo (MC) event generators play a central role, enabling realistic simulations of Standard Model processes and providing the basis for physics studies. However, technical consistency across different generators remains critical, particularly in domains where agreement is expected. To address this need, we present , a Python-based package that automates the benchmarking process for MC generators. The tool translates universal physics inputs into generator-specific configurations, ensuring consistency, reproducibility, and reduced human error. Its modular design allows for straightforward integration of additional generators, supports batch processing, and provides compatibility with the Key4hep software stack.

Poland

Alan Price

Germany

Dirk Zerwas

Configuration and benchmarking of $$\textrm{e}^+\textrm{e}^-$$ processes with k4GeneratorsConfig

In this paper, pair production of standard model (SM)-like Higgs bosons, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>h</mi><mi>h</mi></math>, is studied through <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>γ</mi><mi>γ</mi></math> scattering at future electron-positron colliders, in the framework of the inert doublet model with two active doublets—i.e., the I(<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mn>1</mn><mo>+</mo><mn>2</mn></mrow></math>)HDM for short. The relevance of the process <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>γ</mi><mi>γ</mi><mo stretchy="false">→</mo><mi>h</mi><mi>h</mi></math> for such a beyond-the-SM (BSM) scenario stems from the fact that it is a one-loop process at lowest order, wherein inert charged states <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>χ</mi><mo>±</mo></msup></math> contribute alongside <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>W</mi><mo>±</mo></msup></math>, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>H</mi><mo>±</mo></msup></math>, and heavy fermions (primarily, bottom and top quarks), crucially, at the same perturbative order. Given that <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>χ</mi><mo>±</mo></msup><mo>/</mo><msup><mi>H</mi><mo>±</mo></msup></math> masses and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>h</mi><msup><mi>S</mi><mo>+</mo></msup><msup><mi>S</mi><mo>−</mo></msup></math> (<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>S</mi><mo>±</mo></msup><mo>=</mo><msup><mi>χ</mi><mo>±</mo></msup><mo>,</mo><msup><mi>H</mi><mo>±</mo></msup></math>) couplings are very mildly constrained, there exist regions of the parameter space of the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="normal">I</mi><mo stretchy="false">(</mo><mrow><mn>1</mn><mo>+</mo><mn>2</mn></mrow><mo stretchy="false">)</mo><mi>HDM</mi></math> where the former can be rather light and the latter rather large. After imposing up-to-date theoretical and experimental constraints on the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="normal">I</mi><mo stretchy="false">(</mo><mrow><mn>1</mn><mo>+</mo><mn>2</mn></mrow><mo stretchy="false">)</mo><mi>HDM</mi></math>, it is found that the production rates of such processes at future <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>γ</mi><mi>γ</mi></math> machines can be enhanced by up to a factor of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo>≈</mo><mn>50</mn></math> with respect to the SM, significantly exceeding typical yields of conventional two-Higgs-doublet models (2HDMs). Further, thanks to the level of control that one can attain at such facilities on the photon kinematics, leading to excellent invariant mass resolution of the incoming photon pairs, we show how it is possible to extract from this process the value of the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>χ</mi><mo>±</mo></msup></math> mass (along with those of the active <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>H</mi><mo>±</mo></msup></math> states) with high precision, and whichever of the decays of the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>h</mi><mi>h</mi></math> pair, both with and without beam polarization.

France

Morocco

Abdesslam Arhrib

Ayoub Hmissou

Sweden

Stefano Moretti

Larbi Rahili

Probing standard-model-like di-Higgs production at photon-photon colliders in the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi mathvariant="normal">I</mi><mo stretchy="false">(</mo><mrow><mn>1</mn><mo>+</mo><mn>2</mn></mrow><mo stretchy="false">)</mo><mi>HDM</mi></mrow></math> type-I

We study neutrino nonstandard interactions (NSI) induced by the trilinear <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>L</mi><mi>i</mi></msub><msub><mi>L</mi><mi>j</mi></msub><msubsup><mi>E</mi><mi>k</mi><mi>c</mi></msubsup></math> (LLE) couplings in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>R</mi></math>-parity-violating supersymmetry in a split-family spectrum where third-generation sleptons can be comparatively light. We systematically classify the relevant coupling patterns, derive the corresponding effective interactions and NSI parameters, and confront the resulting parameter space with a broad set of experimental constraints. We find that percent-level NSI can be realized in selected channels, with the largest magnitudes reaching <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>ϵ</mi><mrow><mi>e</mi><mi>e</mi></mrow></msub><mo>≃</mo><mn>8</mn><mo>%</mo></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>ϵ</mi><mrow><mi>μ</mi><mi>μ</mi></mrow></msub><mo>≃</mo><mn>3.8</mn><mo>%</mo></math>, while other entries are typically restricted to the subpercent level (including <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>ϵ</mi><mrow><mi>μ</mi><mi>τ</mi></mrow></msub><mo>≃</mo><mo>−</mo><mn>0.3</mn><mo>%</mo></math> in the viable off-diagonal case). We also highlight the structural origin of the different constraint patterns between <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mover accent="true"><mi>τ</mi><mo stretchy="false">˜</mo></mover><mi>R</mi></msub></math>- and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mover accent="true"><mi>τ</mi><mo stretchy="false">˜</mo></mover><mi>L</mi></msub></math>-mediated scenarios and comment on the relation to the Zee model.

United States

Fang Xu

Neutrino nonstandard interactions from <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>L</mi><mi>L</mi><mi>E</mi></math>-type <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>R</mi></math>-parity violation

Atmospheric neutrinos provide a unique avenue to probe theories beyond the Standard Model (BSM) over a wide range of energies and path lengths. The theory of nonstandard interactions (NSI) of neutrinos is one of the important BSM scenarios, which can modify flavor oscillations of atmospheric neutrinos traveling through the Earth. In this work, we use a high-purity <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>ν</mi><mi>μ</mi></msub></math> charged-current (CC) sample of atmospheric neutrinos from IceCube DeepCore with a livetime of 7.5 years to search for the NSI parameters <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>ϵ</mi><mrow><mi>e</mi><mi>μ</mi></mrow></msub></math>, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>ϵ</mi></mrow><mrow><mi>e</mi><mi>τ</mi></mrow></msub></mrow></math>, and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>ϵ</mi></mrow><mrow><mi>e</mi><mi>e</mi></mrow></msub><mo>−</mo><msub><mrow><mi>ϵ</mi></mrow><mrow><mi>μ</mi><mi>μ</mi></mrow></msub></mrow></math>. The <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>ν</mi><mi>μ</mi></msub></math> CC events mainly come from the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>ν</mi><mi>μ</mi></msub></math> survival channel having no significant dependence on <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>δ</mi><mrow><mi>C</mi><mi>P</mi></mrow></msub></math>. Therefore, the constraints on <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>ϵ</mi><mrow><mi>e</mi><mi>μ</mi></mrow></msub></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>ϵ</mi><mrow><mi>e</mi><mi>τ</mi></mrow></msub></math> obtained using this <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>ν</mi><mi>μ</mi></msub></math> CC sample are expected to be free from the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>δ</mi><mrow><mi>C</mi><mi>P</mi></mrow></msub></math>-degeneracy. The data sample is found to be in agreement with the standard neutrino interactions. Therefore, we place bounds on these NSI parameters that are consistent with and comparable to existing experimental constraints. These <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>δ</mi><mrow><mi>C</mi><mi>P</mi></mrow></msub></math>-free constraints from IceCube DeepCore are complementary to those from the long-baseline neutrino oscillation experiments, where the appearance channel depends on <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>δ</mi><mrow><mi>C</mi><mi>P</mi></mrow></msub></math>.

India

J Krishnamoorthi

Anil Kumar

Sanjib Kumar Agarwalla

<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>δ</mi></mrow><mrow><mi>C</mi><mi>P</mi></mrow></msub></mrow></math>-free constraints on NSI parameters <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>ϵ</mi><mrow><mi>e</mi><mi>μ</mi></mrow></msub></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>ϵ</mi><mrow><mi>e</mi><mi>τ</mi></mrow></msub></math> using high-purity <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>ν</mi><mi>μ</mi></msub></math> CC events at IceCube DeepCore

A sensitivity study of $ \bar{K}_1(1270) $ decay-mode measurements is performed using semileptonic $\textit{D}$-meson decays. The BESIII experiment is used as a case study, in which a simultaneous analysis of $ \bar{K}_1(1270) $ decays to the four three-body final states $ K^-\pi^+\pi^- $ , $ K^-\pi^+\pi^0 $ , $ K_S^0\pi^+\pi^- $ , and $ K_S^0\pi^-\pi^0 $ is presented, and a model-independent determination of $ {\cal{B}}(\bar{K}_1(1270)\to \bar K\pi\pi) $ that does not require detailed knowledge of intermediate resonant contributions is proposed.

Ying'ao Tang

Liang Sun

Panting Ge

Menghao Wang

Sensitivity study of ${\bar{K}_1(1270)}$ decay dynamics using four ${D\to \bar{K}_1(1270)(\to \bar K\pi\pi)e^+\nu_e}$ decay channels * Supported by the National Natural Science Foundation of China (NSFC) (12575102, 12192265, 12405094) and Science and Technology R&D Program Joint Fund Project of Henan Province (225200810030)

We present a systematic analysis of the Higgs signal strengths at 125 GeV and 95 GeV in a non-supersymmetric $ U(1)_X $ model with vector-like fermions ( $ U(1)_X $ VLFM). This framework extends the Standard Model (SM) by introducing an additional $ U(1)_X $ gauge symmetry, three right-handed neutrinos, two singlet Higgs fields ($\textit{ϕ}$ and $\textit{S}$), and one generation of vector-like quarks and leptons. The scalar fields mix in the neutral CP-even sector, yielding two Higgs-like states around 95 GeV and 125 GeV. We perform a $ \chi^2 $ analysis that combines the Higgs signal strength measurements at 125 GeV from ATLAS and CMS, including the $ \gamma\gamma $ , $ WW^* $ , $ ZZ^* $ , $ b\bar{b} $ , and $ \tau\bar{\tau} $ channels, together with the 95 GeV excesses observed in the diphoton and $ b\bar{b} $ final states reported by CMS and LEP. Our results indicate that the $ U(1)_X $ VLFM successfully reproduces the observed signal strengths of the 125 GeV Higgs while simultaneously explaining the 95 GeV excess. The parameters $ g_X $ , $ g_{YX} $ , $ v_S $ , $ v_P $ , and the new Yukawa couplings play a crucial role in achieving this consistency.

Rong-Zhi Sun

Shu-Min Zhao

Meng-Zi Cao

Song Gao

Portugal

Xing-Xing Dong

Higgs Bosons at 95 and 125 GeV in the $\textit{U}$(1) $\textit{X}$ VLFM * Supported by National Natural Science Foundation of China (NNSFC) (2075074), Natural Science Foundation of Hebei Province (A2023201040, A2022201022, A2022201017, A2023201041), Natural Science Foundation of Hebei Education Department (QN2022173), the Project of the China Scholarship Council (CSC) (202408130113). This work is also supported by Fundação para a Ciência e a Tecnologia (FCT, Portugal) through the project UID/00777/2025 (https://doi.org/ 10.54499/UID/00777/2025)

The <math altimg='si1.svg'><msubsup><mn>3</mn><mn>1</mn><mo>&#8722;</mo></msubsup></math> state at an excitation energy of 2748 keV in the <italic>N</italic>=50 semi-magic 90Zr nucleus was investigated via safe Coulomb excitation in the 32S+ 90Zr system. The octupole transition strength, <math altimg='si7.svg'><mrow><mi>B</mi><mo stretchy='true'>(</mo><mi>E</mi><mn>3</mn><mo>;</mo><msubsup><mn>3</mn><mn>1</mn><mo>&#8722;</mo></msubsup><mo>&#8594;</mo><msubsup><mn>0</mn><mn>1</mn><mo>+</mo></msubsup><mo stretchy='true'>)</mo></mrow></math>, was extracted by fitting the measured <italic>&#947;</italic>-ray intensities using the semiclassical least-squares search codes <small-caps>gosia</small-caps> and <small-caps>gosia2</small-caps>. A pronounced <italic>E</italic>3 strength of <math altimg='si22.svg'><mrow><mn>19</mn><mo>.</mo><msubsup><mn>6</mn><mrow><mo>&#8722;</mo><mn>1.6</mn></mrow><mrow><mo>+</mo><mn>1.7</mn></mrow></msubsup></mrow></math> W.u. was obtained, indicating a collective octupole character for this state. State-of-the-art shell model calculations reproduce this result by describing the excitation as emergent collectivity rooted in microscopic configuration mixing, whereas pure harmonic vibrational models tend to overestimate the strength. In addition, the spectroscopic quadrupole moment of the <math altimg='si2.svg'><msubsup><mn>2</mn><mn>1</mn><mo>+</mo></msubsup></math> state in 90Zr was determined to be <math altimg='si23.svg'><mrow><mo>+</mo><mn>0.09</mn><mo>(</mo><mn>10</mn><mo>)</mo></mrow></math> <italic>e</italic>b, by normalizing the target excitation to the Coulomb-excitation intensities of the 32S projectile in a simultaneous analysis. This value is consistent with the near-spherical structure expected for a semi-magic nucleus. The results yield a coherent picture of collectivity in 90Zr, and are discussed in the context of the evolution of <italic>E</italic>3 strength along the stable Zr chain towards the <italic>N</italic>=56 octupole-magic neutron number.

P. Dey

A. Kundu

R. Palit

P.J. Napiorkowski

Japan

K. Yanase

N. Shimizu

Y. Utsuno

T. Inakura

E. Ideguchi

U. Garg

M. Kumar Raju

Vishal Malik

V. Nanal

S. Pal

A. Sindhu

S. Thorat

First measurement of <math altimg='si7.svg'><mrow><mi>B</mi><mo stretchy='true'>(</mo><mi>E</mi><mn>3</mn><mo>;</mo><msubsup><mn>3</mn><mn>1</mn><mo>&#8722;</mo></msubsup><mo>&#8594;</mo><msubsup><mn>0</mn><mn>1</mn><mo>+</mo></msubsup><mo stretchy='true'>)</mo></mrow></math> in 90Zr through Coulomb excitation: Revisiting octupole collectivity in the Zr chain

Sacha Davidson

Bertrand Echenard

Correction: Reach and complementarity of $$\mu \rightarrow e$$ searches