PaperPanorama

HEP Phenomenology·hep-ph

Thu·Sep 12, 2024

23 papers16 primary·7 cross-listed·reconstructed*

  1. 01*

    Malaphoric models for anomalies

    Ben Allanach🇬🇧 · Nico Gubernari🇬🇧

    We study some phenomenological effects of kinetic mixing between the hypercharge field and a new gauge field in specific models that ameliorate the tensions between measurements and Standard Model predictions in decays. To this end, we rederive the dimension-6 SMEFT coefficients resulting from integrating out the kinetically-mixed (`malaphoric') field. The kinetic mixing provides a family-universal component to the couplings of the field, which can improve fits to lepton flavour universality observables. We show how kinetic mixing improves the best fit of the model to data by 7.0 units of while remaining compatible with other relevant data sets such as electroweak precision observables and measurements of at LEP2.

    hep-phEPJC(2025)·5 citations
  2. 02*

    Unified and optimal frame choice for generalized parton distributions

    Jian-Wei Qiu🇺🇸 · Nobuo Sato🇺🇸 · Zhite Yu🇺🇸

    Reconstructing the internal three-dimensional quark and gluon structures of hadrons through generalized parton distributions (GPDs) from hard exclusive scattering processes is one of the most challenging tasks in nuclear and particle physics. In this paper, we introduce a new optimized reference frame that, for the first time, enables a unified view of all the reactions sensitive to GPDs and facilitates the interpretation of a variety of phase-space patterns that were previously hardly accessible and interpretable. Similarly to how the heliocentric description advanced our understanding of the solar system and gravitation, our new frame centers around a quasireal state, allows for a consistent separation of physical scales, and reveals a novel quantum interference mechanism.

    hep-phhep-exhep-latnucl-ex+1PRD(2025)·5 citations
  3. 03*

    Wigner rotations for cascade reactions

    Kai Habermann🇩🇪 · Mikhail Mikhasenko🇩🇪

    Parametrization of cascading hadronic reactions is a central tool in hadron spectroscopy for modeling matrix elements and extracting parameters of hadronic states. Implementing the helicity formalism consistently presents challenges, particularly for particles with spin, due to the need to match spin states of final-state particles, an operation known as the Wigner rotation. This paper discusses these challenges in detail and offers solutions, including a practical method for implementation. Equipped with a general algorithm for computing Wigner rotations, we extend the studies to alternative amplitude formulations, the minus-phi and canonical conventions.

    hep-phhep-exPRD(2025)·5 citations
  4. 04*

    Detect anomalous quartic gauge couplings at muon colliders with quantum kernel k-means

    Shuai Zhang🇨🇳 · Ke-Xin Chen🇨🇳 · Ji-Chong Yang🇨🇳

    In recent years, with the increasing luminosities of colliders, handling the growing amount of data has become a major challenge for future New Physics~(NP) phenomenological research. To improve efficiency, machine learning algorithms have been introduced into the field of high-energy physics. As a machine learning algorithm, kernel k-means has been demonstrated to be useful for searching NP signals. It is well known that the kernel k-means algorithm can be carried out with the help of quantum computing, which suggests that quantum kernel k-means~(QKKM) is also a potential tool for NP phenomenological studies in the future. This paper investigates how to search for NP signals using the k-means anomaly detection event selection strategy with quantum kernels. Taking the process at a muon collider as an example, the dimension-8 operators contributing to anomalous quartic gauge couplings~(aQGCs) are studied. The expected coefficient constraints obtained using the QKKM of three different forms of quantum kernels and k-means algorithm are presented, it can be shown that QKKM can help to find the signal of aQGCs.

    hep-phEPJC(2025)·9 citations
  5. 05*

    Anisotropic linear waves and breakdown of the momentum expansion in spin magnetohydrodynamics

    Zhe Fang🇨🇳 · Koichi Hattori🇨🇳 · Jin Hu🇨🇳

    We formulate spin magnetohydrodynamics (MHD) by including the magnetic-flux and total angular momentum conservation laws in the hydrodynamic framework. To specify the local angular momentum conservation, we choose the totally antisymmetric spin current. The entropy-current analysis allows for ten dissipative first-order transport coefficients including anisotropic spin relaxation rates and the conversion rate between a vorticity (shear) to a symmetric stress (antisymmetric torque), as well as anisotropic viscosities and resistivities. By employing the linear-mode analysis, we solve the first-order spin MHD equations to determine the dispersion relations with the complete information of anisotropy retained. Our analytic solutions indicate that the small-momentum expansion is spoiled by blow up of the higher-order terms when the angle between the momentum and the magnetic field approaches the right angle. This also reveals the existence of another expansion parameter, and, in light of it, we provide solutions in an alternative series expression beyond the critical angle. We confirm that these two series expansions work well in the appropriate angle ranges as compared with numerical results. Building on our findings regarding the breakdown of the small-momentum expansion in first-order theory, we proceed to discussing how these first-order solutions are modified when we include the relaxation dynamics for dissipative modes with the Israel-Stewart framework. We find that, due to the presence of the critical behavior in the first-order solutions, there remains a diffusive window even after the relaxation dynamics is introduced.

    hep-phnucl-thPRD(2025)·12 citations
  6. 06*

    Finite Energy Resolution, Correlations Between Bins and Non-Nested Hypotheses

    Emilio Ciuffoli🇨🇳 · Jarah Evslin🇨🇳

    We show that whenever independent events are binned, there is no correlation between bins. In particular, neither the uncertainty in the energy resolution nor a systematic error in the energy response of a detector will lead to a correlation between bins. This is in contrast with a result that recently appeared in the literature, where it was claimed that the finite energy resolution could induce correlation between bins, changing the distribution of when attempting to determine the neutrino mass ordering using reactor neutrinos. We will compute the expression for the variance of in the case of non-nested hypotheses if correlations between bins are present, showing that they could indeed affect the distribution. We will also show, however, that the detector response cannot introduce statistical correlations between bins unless these are already present in the original spectrum. Both of these results are valid in general: the absence of correlation is true for any detector response and the distribution of in the presence of (intrinsic) correlations, while obtained having the mass ordering in mind, it is true for any non-nested hypotheses.

    hep-phEPJC(2026)·0 citations
  7. 07*

    CP violation at finite temperature

    Károly Seller🇭🇺 · Zsolt Szép🇭🇺 · Zoltán Trócsányi🇭🇺

    We present a comprehensive study of the finite temperature CP-asymmetry factor needed in the semi-classical treatment of leptogenesis originating from Majorana fermion decays into a lepton and a scalar particle. The imaginary part of the relevant one-loop integrals are evaluated using both the real time and the imaginary time formalisms of thermal quantum field theory. In the former we consider the retarded-advanced approach as well as the original thermal cutting method developed by Kobes and Semenoff. Specific care is directed towards showing the consistency between the various approaches. We show that the final physical result of the calculation is linear in the statistical factors and is consistent with what is obtained in the Kadanoff-Baym approach. We also present analytic expressions for the full CP-asymmetry factor in the form of well-behaved triple-integrals, and provide numerical benchmark predictions in a specific particle physics model.

    hep-phJHEP(2025)·4 citations
  8. 08*

    Muon anomalous magnetic moment and Right handed sterile neutrino

    Iman Motie🇫🇷 · S. Mahmoudi🇮🇷 · Mahdi Sadegh🇮🇷 · Jafar Khodagholizadeh🇮🇷 · Alain Blanchard🇫🇷 · She-Sheng Xue🇮🇹

    The muon's magnetic moment is a fundamental quantity in particle physics and the deviation of its value from quantum electrodynamics (QED), motivates research beyond the standard models (SM). In this study, we utilize the effective coupling of right-handed sterile neutrinos with SM gauge bosons to calculate the muon anomalous magnetic moment (AMM) at one-loop level. The contribution of the sterile neutrino interactions on the AMM is calculated by considering the standard and non-standard neutrino interactions. Our results show that the standard sterile neutrino interactions give a negligible contribution to while the non-standard neutrino interactions can play a significant role in explaining the muon anomaly. In the context of the non-standard neutrino interaction, our calculation shows that a Dirac mass scale around could explain the muon anomaly if the right handed sterile neutrino's coupling with SM particles is about . We have also plotted the allowed region of the model parameters that satisfy the experimental data on and discuss the percentage of the anomaly compensation in terms of the coupling constant .

    hep-phPTEP(2025)·1 citation
  9. 09*

    Phenomenological model for the reaction in the energy region

    Xiu-Lei Ren🇩🇪 · Igor Danilkin🇩🇪 · Marc Vanderhaeghen🇩🇪

    Motivated by the ongoing analysis by the BESIII Collaboration on the single-tagged reaction, we present a phenomenological study of the diphoton fusion to , focusing on the production mechanism of the resonance. Contributions from the and channels are included without introducing free parameters within an effective Lagrangian approach. Assuming the destructive interference between the amplitudes, we predict the invariant mass distributions, angular distributions, and total cross sections of the process, which will be tested by the forthcoming BESIII measurements.

    hep-phhep-exnucl-thPRD(2024)·4 citations
  10. 10*

    From Feynman integrals to quantum algorithms: the Loop-Tree Duality connection

    German Sborlini🇪🇸

    In the context of high-energy particle physics, a reliable theory-experiment confrontation requires precise theoretical predictions. This translates into accessing higher-perturbative orders, and when we pursue this objective, we inevitably face the presence of complicated multi-loop Feynman integrals. There are serious bottlenecks to compute them with classical tools: the time to explore novel technologies has arrived. In this work, we study the implementation of quantum algorithms to optimize the integrands of scattering amplitudes. Our approach relies on the manifestly causal Loop-Tree Duality (LTD), which re-casts the loop integrand into phase-space integrals and avoids spurious non-physical singularities. Then, we codify this information in such a way that a quantum computer can understand the problem, and build Hamiltonians whose ground state are directly related to the causal representation. Promising results for generic families of multi-loop topologies are presented.

    hep-phhep-thPoS(2025)·1 citation
  11. 11*

    form factors and their applications to semi-leptonic and non-leptonic weak decays

    Hao Yang🇨🇳 · Zhi-Qing Zhang🇨🇳 · You-Ya Yang🇨🇳 · Peng Li🇨🇳

    Similar to other heavy flavor mesons, the weak decays of mesons can provide a platform to verify the standard model, explore new physics, and understand the mechanisms of weak interactions. At present, the theoretical and experimental studies on mesons are relatively limited. In addition to the dominant electromagnetic decays, the weak decays should be feasible to explore the mesons. In this study, we used the covariant light-front quark model to study the form factors of the transitions , then calculated the branching ratios of the semi-leptonic decays and the non-leptonic decays with and . The channels and possess the largest branching ratios, which can reach an order of among these decays, and are most likely to be accessible in experiments at future high-luminosity colliders. Furthermore, we predict and discuss the longitudinal polarization fraction and the forward-backward asymmetry for the considered semi-leptonic decays.

    hep-phCPC(2025)·0 citations
  12. 12*

    Measuring the weak mixing angle at SBND

    Gustavo F. S. Alves🇧🇷 · Antonio P. Ferreira🇧🇷 · Shirley Weishi Li🇺🇸 · Pedro A. N. Machado🇺🇸 · Yuber F. Perez-Gonzalez🇬🇧

    The weak mixing angle provides a sensitive test of the Standard Model. We study SBND's sensitivity to the weak mixing angle using neutrino-electron scattering events. We perform a detailed simulation, paying particular attention to background rejection and estimating the detector response. We find that SBND can provide a reasonable constraint on the weak mixing angle, achieving 8% precision for protons on target, assuming an overall flux normalization uncertainty of 10%. This result is superior to those of current neutrino experiments and is relatively competitive with other low-energy measurements.

    hep-phhep-ex9 citations
  13. 13*

    Minimizing Selection Bias in Inclusive Jets in Heavy-Ion Collisions with Energy Correlators

    Carlota Andres🇺🇸 · Jack Holguin🇬🇧 · Raghav Kunnawalkam Elayavalli🇺🇸 · Jussi Viinikainen🇺🇸

    The first-ever measurement of energy correlators within inclusive jets produced in heavy-ion collisions, revealed by the CMS Collaboration, shows a clear enhancement at large angles relative to the proton-proton (p-p) baseline. However, interpreting this enhancement is complicated due to selection bias from energy loss, which also distorts the energy correlator heavy-ion to p-p ratio in the hadronization region, hindering our understanding of parton/hadron dynamics in a colored medium. In this Letter, we introduce a new ratio of energy correlator observables that removes the leading effects of selection bias from the two-point energy correlator spectrum (E2C). Pythia and Herwig simulations show that the impact of selection bias in the E2C is reduced by an order of magnitude, while sensitivity to any other medium modifications is retained. This quantity can be obtained directly from the experimental measurements presented by CMS, as illustrated in the accompanying note.

    hep-phhep-exnucl-exnucl-thPRL(2025)·30 citations
  14. 14*

    Anomalous Ionization in the Central Molecular Zone by sub-GeV Dark Matter

    Pedro De la Torre Luque🇪🇸 · Shyam Balaji🇬🇧 · Joseph Silk🇫🇷

    We demonstrate that the anomalous ionization rate observed in the Central Molecular Zone can be attributed to MeV dark matter annihilations into pairs for galactic dark matter profiles with slopes . The low annihilation cross-sections required avoid cosmological constraints and imply no detectable inverse Compton, bremsstrahlung or synchrotron emissions in radio, X and gamma rays. The possible connection to the source of the unexplained 511 keV line emission in the Galactic Center suggests that both observations could be correlated and have a common origin.

    hep-phastro-ph.HEPRL(2025)·11 citations
  15. 15*

    Grand Unification at the Cosmological Collider with Chemical Potential

    Arushi Bodas🇺🇸 · Edward Broadberry🇺🇸 · Raman Sundrum🇺🇸

    We introduce a tree-level chemical potential mechanism for spin-1 particles within cosmological collider physics, allowing them to be detected in primordial non-Gaussianities for masses above the inflationary Hubble scale. We apply this mechanism to orbifold grand unification and the massive unification partners of the standard model gauge bosons. Our mechanism requires at least a pair of massive vector fields which are singlets of the standard model, a condition which is satisfied in the classic "trinification" scenario. Assuming that the gauge hierarchy problem is solved by supersymmetry, gauge coupling running points to unification partners at ~ GeV. We show that, within high-scale inflation, chemical potential enhancement can lead to observably strong signals for trinification partners in future cosmological surveys.

    hep-phastro-ph.COJHEP(2025)·20 citations
  16. 16*

    Minimizing Selection Bias in Inclusive Jets in Heavy-Ion Collisions with Energy Correlators -- arXiv note

    Carlota Andres🇺🇸 · Jack Holguin🇬🇧

    This note serves as a companion to a Letter, where we introduce a new energy correlator-based observable designed to minimize the impact of selection bias due to energy loss in inclusive jets in heavy-ion collisions. Here, we apply the method outlined in the Letter to the first-ever measurement of energy correlators in heavy-ion collisions, recently released by the CMS Collaboration.

    hep-phhep-exnucl-exnucl-th9 citations
  17. 17*

    Phase Stability in the 3-Dimensional Open-source Code for the Chiral mean-field Model

    Nikolas Cruz-Camacho🇺🇸 · Rajesh Kumar🇺🇸 · Mateus Reinke Pelicer🇺🇸 · Jeff Peterson🇺🇸 · T. Andrew Manning🇺🇸 · Roland Haas🇺🇸 · Veronica Dexheimer🇺🇸 · Jaquelyn Noronha-Hostler🇺🇸

    In this paper we explore independently for the first time three chemical potentials (baryon , charged , and strange ) in the Chiral Mean Field (CMF) model. We designed and implemented \texttt{CMF++}, a new version of the CMF model rewritten in \texttt{C++} that is optimized, modular, and well-documented. \texttt{CMF++} has been integrated into the MUSES Calculation Engine as a free and open-source software module. The runtime improved in more than 4 orders of magnitude across all 3 chemical potentials, when compared to the legacy code. Here we focus on the zero temperature case and study stable, as well as metastable and unstable, vacuum, hadronic, and quark phases, showing how phase boundaries vary with the different chemical potentials. Due to the significant numerical improvements in \texttt{CMF++}, we can now for the first time sweep the entire , , phase space, investigate metastable phases, and calculate high-order susceptibilities within the CMF framework. This allows us to find phases of matter that include a light hadronic phase, a strangeness-dominated hadronic phase, and a quark phase. The numerical improvements also allow us to identify the order of the transitions among these phases, finding a first-order chiral symmetry restoration phase transition among the hadronic phases (favored for negative and/or for some coupling schemes), in addition to third-order phase transitions. In particular, we identify for the first time triple points in the CMF model, where both chiral symmetry restoration and deconfinement phase transitions meet in the chemical potential phase space. Such points could potentially be identified in low-energy heavy-ion collisions.

    nucl-thastro-ph.HEhep-phPRD(2025)·29 citations
  18. 18*

    Resolution of (Heavy) Primaries in Ultra High Energy Cosmic Rays

    Blaž Bortolato🇸🇮 · Jernej F. Kamenik🇸🇮 · Michele Tammaro🇮🇹

    Measurements of Ultra-High Energy Cosmic Rays (UHECR) suggest a complex composition with significant contributions from heavy nuclei at the highest energies. We systematically explore how the selection and number of primary nuclei included in the analysis impact the inferred UHECR mass composition. Introducing a distance measure in the space of distribution moments, we demonstrate that limiting the analysis to a few primaries can introduce significant biases, particularly as observational data improves. We provide lists of primaries approximately equidistant in the new measure, which guaranty unbiased results at given statistical confidence. Additionally, we explore consistent inclusion of nuclei heavier than iron and up to plutonium, deriving first observational upper bounds on their contributions to UHECR with the Pierre Auger Open Data.

    astro-ph.HEhep-phEPJC(2024)·2 citations
  19. 19*

    Groomed Event Shapes at HERA and the sPHENIX TPC

    Henry T. Klest🇺🇸

    This thesis summarizes the work of the author in two directions, both aimed at the study of quantum chromodynamics (QCD). The first topic presented is a measurement of groomed event shapes using archived data collected by the H1 experiment at HERA. The data analysis methods and physics implications of the results are discussed, with the goal of improving the theoretical description of the hadronic final state in electron-hadron collisions before the construction of the Electron-Ion Collider (EIC). The second topic concerns the sPHENIX experiment, which is now installed at the Relativistic Heavy Ion Collider (RHIC). The sPHENIX physics program and apparatus will be discussed, along with a description of each of the subdetectors. Special attention will be dedicated to the operating principles, design, and construction of the time projection chamber (TPC).

    nucl-exhep-exhep-ph0 citations
  20. 20*

    Experimental Summary of the Moriond 2024 conference -- Electroweak Interaction & Unified Theories

    Barbara Clerbaux🇧🇪

    The proceeding gives a summary of the experimental results presented at the Moriond 2024 conference (electroweak interactions and unified theory session), focussing on the latest measurements. A variety of topics were covered in the various sessions of the conference including H boson properties, measurements in the electroweak and top quark sectors, flavour and neutrino physics, searches for dark matter and physics beyond the standard model, as well as astroparticle and precision physics.

    hep-exhep-ph0 citations
  21. 21*

    Cosmic-ray deuteron excess from a primary component

    Xing-Jian Lv🇨🇳 · Xiao-Jun Bi🇨🇳 · Kun Fang🇨🇳 · Peng-Fei Yin🇨🇳 · Meng-Jie Zhao🇨🇳

    The recent AMS-02 measurements of cosmic-ray (CR) deuteron fluxes suggest the presence of primary deuterons in quantities far exceeding predictions from Big Bang nucleosynthesis. This poses a significant challenge to modern astrophysics, as no known processes can account for such large amounts of deuterons without violating existing constraints~\cite{Epstein:1976hq}. In contrast, it is recently proposed that the AMS-02 measurements can be explained by a purely secondary origin when contributions from heavier nuclei are considered. In this study, we recalculate the secondary deuteron flux using production cross sections updated with the latest collider data. We find that some of the deuteron production cross sections are overestimated in the widely-used calculation tools for CR propagation, and a primary deuteron component is still necessary. We then propose a novel process for generating primary deuterons at CR sources through a fusion mechanism, which is naturally unique to deuterons. This model could explain the observed deuteron excess while maintaining consistency with other CR measurements.

    astro-ph.HEhep-phPRD(2024)·4 citations
  22. 22*

    How new physics affects primordial neutrinos decoupling: Direct Simulation Monte Carlo approach

    Maksym Ovchynnikov🇨🇭 · Vsevolod Syvolap🇳🇱

    Cosmological observations from Big Bang Nucleosynthesis and the Cosmic Microwave Background (CMB) offer crucial insights into the Early Universe, enabling us to trace its evolution back to lifetimes as short as 0.01 seconds. Upcoming CMB spectrum measurements will achieve unprecedented precision, allowing for more accurate extraction of information about the primordial neutrinos. This provides an opportunity to test whether their properties align with the predictions of the standard cosmological model or indicate the presence of new physics that influenced the evolution of the MeV-temperature plasma. A key component in understanding how new physics may have affected primordial neutrinos is solving the neutrino Boltzmann equation. In this paper, we address this question by developing a novel approach -- neutrino Direct Simulation Monte Carlo (DSMC). We discuss it in-depth, highlighting its model independence, transparency, and computational efficiency -- features that current state-of-the-art methods lack. Then, we introduce a proof-of-concept implementation of the neutrino DSMC and apply it to several toy scenarios, showcasing key aspects of the primordial plasma's evolution in the presence of new physics.

    astro-ph.COhep-phPRD(2025)·14 citations
  23. 23*

    Cutting rule for in-in correlators and cosmological collider

    Yohei Ema🇺🇸 · Kyohei Mukaida🇯🇵

    We derive a cutting rule for equal-time in-in correlators including cosmological correlators based on Keldysh basis, which decomposes diagrams into fully retarded functions and cut-propagators consisting of Wightman functions. Our derivation relies only on basic assumptions such as unitarity, locality, and the causal structure of the in-in formalism, and therefore holds for theories with arbitrary particle contents and local interactions at any loop order. As an application, we show that non-local cosmological collider signals arise solely from cut-propagators under the assumption of microcausality. Since the cut-propagators do not contain (anti-)time-ordering theta functions, the conformal time integrals are factorized, simplifying practical calculations.

    hep-thastro-ph.COhep-phJHEP(2024)·36 citations

* 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.