Thu·Dec 26, 2024Thursday·December 26, 2024

1. 01*

   Extension of the Standard Model with Chern-Simons type interaction

   V. Gorkavenko🇺🇦 · I. Hrynchak🇺🇦 · O. Khasai🇺🇦 · M. Tsarenkova🇺🇦

   Extension of the Standard Model with Chern-Simons type interaction contains a new vector massive boson (Chern-Simons boson) that couples to electroweak gauge bosons by the so-called effective Chern-Simons interaction. There is no direct interaction between the Chern-Simons bosons and SM fermions. We consider existing restrictions on the parameters of this SM extension, the effective loop interaction of a new vector boson with SM fermions, and the possibility of the manifestation of the long-lived GeV-scale Chern-Simons bosons in collider experiments.

   hep-phUkr.J.Phys.(2024)·1 citation
2. 02*

   LHC-friendly freeze-in dark matter via Higgs portal

   Xinyue Yin🇨🇳 · Shuai Xu🇨🇳 · Sibo Zheng🇨🇳

   It is known that single-field freeze-in dark matter barely leaves footprints in dark matter direct detection and collider experiments. This situation can be altered in two-field context. In this work we propose a two-field freeze-in dark matter model through Higgs portal. The observed dark matter relic abundance is obtained by a decay of scalar mediator thermalized in the early Universe. While there is a lack of direct dark matter signals, the scalar mediator is in the reach of HL-LHC either through vector boson fusion or Mono-Z channel. Within allowed scalar mass window of 10-50 GeV, we use improved cuts to derive both $2\sigma$ exclusion and $5\sigma$ discovery limits, depending on the value of Higgs portal coupling. If verified, this scalar mediator signal allows us to infer the freeze-in dark matter.

   hep-phastro-ph.COhep-exPRD(2025)·3 citations
3. 03*

   Cosmic Colliders: High Energy Physics with First-Order Phase Transitions

   Bibhushan Shakya🇩🇪

   Collisions of vacuum bubbles in the early Universe can act as cosmic-scale high-energy colliders with energy reach close to the Planck scale. Such "cosmic colliders" would represent the most energetic phenomena in our cosmic history, transcending any temperature or energy scale ever reached in our Universe, opening tremendous opportunities for particle physics and cosmology. Such configurations are realized during first-order phase transitions with runaway bubbles -- a topic of significant current research interest as a promising cosmological source of gravitational waves. We discuss recent developments and challenges in the physics of such cosmic colliders, as well as their broad applications for particle physics and cosmology, from dark matter to leptogenesis to gravitational waves.

   hep-ph1 citation
4. 04*

   Learning Broken Symmetries with Approximate Invariance

   Seth Nabat🇺🇸 · Aishik Ghosh🇺🇸 · Edmund Witkowski · Gregor Kasieczka🇩🇪 · Daniel Whiteson🇺🇸

   Recognizing symmetries in data allows for significant boosts in neural network training, which is especially important where training data are limited. In many cases, however, the exact underlying symmetry is present only in an idealized dataset, and is broken in actual data, due to asymmetries in the detector, or varying response resolution as a function of particle momentum. Standard approaches, such as data augmentation or equivariant networks fail to represent the nature of the full, broken symmetry, effectively overconstraining the response of the neural network. We propose a learning model which balances the generality and asymptotic performance of unconstrained networks with the rapid learning of constrained networks. This is achieved through a dual-subnet structure, where one network is constrained by the symmetry and the other is not, along with a learned symmetry factor. In a simplified toy example that demonstrates violation of Lorentz invariance, our model learns as rapidly as symmetry-constrained networks but escapes its performance limitations.

   hep-phcs.LGhep-exPRD(2025)·7 citations
5. 05*

   Effective Lagrangian for strong and electromagnetic interactions of high-spin resonances

   Sang-Ho Kim🇰🇷 · Yongseok Oh🇰🇷 · Sangyeong Son🇰🇷 · S. Sakinah🇰🇷 · Myung-Ki Cheoun🇰🇷

   Recent experiments of photon-nucleon and meson-nucleon scatterings have accumulated a lot of data for various meson production processes. One of the purposes of those experiments is to search for the missing resonances which are not discovered until now but whose existence was predicted by hadron models. The analyses of the data requires the development of dynamical coupled-channel models. Since several missing resonances are expected to have spin higher than 3/2, we need to include higher-spin resonances in dynamical coupled-channel models, which enable us to determine the couplings of effective Lagrangians of higher-spin baryons with pseudoscalar mesons or vector mesons. However, hadron models, such as quark models, give predictions only of the decay amplitudes of such baryons. Here we demonstrate the formalism of high-spin resonances and construct the relation between the coupling constants of effective Lagrangians and the partial decay widths that can be predicted by hadron models. This allows us to compare the coupling constants to the hadron model predictions not only in magnitude but in sign as well.

   hep-phPRD(2025)·8 citations
6. 06*

   Towards factorization with emergent scales for jets in dense media

   Balbeer Singh🇺🇸 · Varun Vaidya🇺🇸

   Employing the recently developed open quantum system Effective Field Theory framework, we investigate jet production and evolution in a dense nuclear medium in electron-ion/heavy-ion collisions. We confirm that the frequent monitoring of the jet by the medium leads to the emergence of a perturbative transverse momentum scale, often referred to as the saturation scale that necessitates further factorization to completely isolate the non-perturbative physics of the medium. A part of this goal is achieved in this paper by providing an operator definition for the broadening probability of a gluon in the medium within the Markovian approximations. We show that this distribution is (semi)universal; it depends on the angular measurement on the jet and probes both the large and small $x$ dynamics of the medium. We further elucidate all other contributions to non-perturbative physics suggesting that the parameterization of non-perturbative physics is more complex than previously assumed and outline steps required for a complete factorization of the jet production cross section.

   hep-phhep-thnucl-th4 citations
7. 07*

   Strong decay properties of P-wave single bottom baryons of the SU(3) flavor antitriplet ${\bar{3}}_{\mathbf{F}}$

   Yi-Jie Wang🇨🇳 · Xuan Luo🇨🇳 · Hua-Xing Chen🇨🇳 · Er-Liang Cui🇨🇳 · Wei-Han Tan🇨🇳 · Zhi-Yong Zhou🇨🇳

   We study the $P$-wave bottom baryons of the $SU(3)$ flavor antitriplet and systematically calculate their strong decay properties, including their $D$-wave decays into ground-state bottom baryons with light pseudoscalar mesons and $S$-wave decays into ground-state bottom baryons with light vector mesons. Together with Refs.~\cite{Tan:2023opd,Yang:2019cvw,Yang:2020zrh,Luo:2024jov}, a rather complete investigation has been performed to study their mass spectra and strong/radiative decay properties, through the methods of QCD sum rules and light-cone sum rules within the framework of heavy quark effective theory. Among various possibilities, we identify four ${\Lambda }_b$ and four ${\Xi }_b$ baryons, with limited decay widths and so capable of being observed in experiments. Their masses, mass splittings within the same multiplets, and strong/radiative decay widths are summarized in Table~\ref{tab:decayb3f} for future experimental searching.

   hep-phPRD(2025)·9 citations
8. 08*

   Phase and equation of state of finite density QC${}_2$D at lower temperature

   Etsuko Itou🇯🇵 · Kei Iida🇯🇵 · Kotaro Murakami🇯🇵 · Daiki Suenaga🇯🇵

   We investigate the phase structure and the equation of state (EoS) for dense two-color QCD at low temperatures, $T=40$ MeV ($32^4$ lattice) and $T=80$ MeV ($16^4$ lattice). A rich phase structure below the pseudo-critical temperature $T_c$ as a function of quark chemical potential $\mu$ has been revealed. By performing $T=40$ MeV simulations, essentially similar results to the previous ones at $T=80$ MeV are obtained, but several finer understandings are achieved. Breaking of the conformal bound is also confirmed thanks to smaller statistical errors. This talk is mainly based on Refs.~\cite{Iida:2022hyy, Iida:2024irv}. It also includes related studies and subsequent developments that were not mentioned in the original papers.

   ↳ hep-lathep-phnucl-thPoS(2025)·0 citations
9. 09*

   Many-body atomic response functions of xenon and germanium for leading-order sub-GeV dark matter-electron interactions in effective field theory

   C.-P. Liu🇹🇼 · Mukesh K. Pandey🇹🇼 · Lakhwinder Singh🇮🇳 · Chih-Pan Wu🇹🇼 · Jiunn-Wei Chen🇹🇼 · Hsin-Chang Chi🇹🇼 · Henry T. Wong🇹🇼

   Direct searches of dark matter candidates with mass energies less than 1 GeV is an active research field. The energy depositions are comparable to the scale of atomic, molecular, or condensed matter systems, therefore many-body physics plays an important role in understanding the detector's response in dark matter scattering. We present in this work a comprehensive data set of atomic response functions for xenon and germanium with 12.2 and 80 eV energy thresholds, respectively, using the (multiconfiguration) relativistic random phase approximation. This approach takes into account the relativistic, exchange, and correlation effects in one self-consistent framework, and is benchmarked successfully by photoabsorption data from thresholds to 30 keV with $\lesssim 5\%$ errors. Comparisons with our previous and some other independent particle approaches in literature are made. It is also found that the spin-dependent (SD) response has significant difference from the spin-independent (SI) one such that the dark matter SD and SI interactions with electrons can be distinguished in unpolarized scattering, which is typical for direct search detectors. Finally, the exclusion limits set by current experiments are updated with our new results.

   ↳ astro-ph.COhep-exhep-phPRD(2026)·1 citation

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.