PaperPanorama

HEP Phenomenology·hep-ph

Thu·Sep 30, 2021

35 papers26 primary·9 cross-listed·reconstructed*

  1. 01*

    Nuclear fusion catalyzed by doubly charged scalars: Implications for energy production

    Evgeny Akhmedov (MPIK Heidelberg)🇩🇪

    A number of popular extensions of the Standard Model of particle physics predict the existence of doubly charged scalar particles . Such particles may be long-lived or even stable. If exist, could form atomic bound states with light nuclei and catalyze their fusion by essentially eliminating the Coulomb barrier between them. Such an -catalyzed fusion (CF) process does not require high temperatures or pressure and may have important applications for energy production. A similar process of muon-catalyzed fusion (CF) has been shown not to be a viable source of energy because of the sticking of negative muons to helium nuclei produced in the fusion of hydrogen isotopes, which stops the catalytic process. We analyze CF in deuterium environments and show that the -particles can only stick to Li nuclei, which are produced in the third-stage reactions downstream in the catalytic cycle. The corresponding sticking probability is very low, and, before getting bound to Li, each -particle can catalyze fusion cycles, producing TeV of energy. We also discuss the ways of reactivating the -particles from the Coulomb-bound () states, which would allow re-using them in CF reactions.

    hep-phastro-ph.SRhep-exnucl-ex+1PRD(2022)·4 citations
  2. 02*

    Neutral Exotica at FASER and SND@LHC

    S. Ansarifard🇮🇷 · Y. Farzan🇮🇷

    The anomaly indicates that the second generation of leptons should have new interactions beyond the standard model. The high flux of and at the forward experiments such as FASER and SND@LHC makes them suitable setups to search for new interactions of the second generation leptons. In this paper, we build a model in which the second generation left-handed leptons couple to a new right-handed neutrino, and a new Higgs doublet which also couples to the quarks. The scattering of high energy off nuclei can produce . We investigate how forward experiments can test this model by looking for the production vertex followed by the displaced vertex of the decay. Discovering even a single such event can be a harbinger to look for the spectacular signals of the new Higgs doublet production at the LHC. We discuss the possibility of explaining the anomaly by adding more generations of which will lead to chain decays of and multiple leptons with distinct signals both at forward experiments and at the CMS and ATLAS detectors. Finally, we show that by adding a new light singlet scalar mixed with the neutral component of the new Higgs doublet ({\it i.e.,} 2HDM+ model), the statistics of the data sample can be dramatically increased.

    hep-phJHEP(2022)·12 citations
  3. 03*

    Lorentz symmetry and high-energy neutrino astronomy

    Carlos A. Argüelles🇺🇸 · Teppei Katori🇬🇧

    The search of violation of Lorentz symmetry, or Lorentz violation (LV), is an active research field. The effects of LV are expected to be very small and special systems are often used to search it. High-energy astrophysical neutrinos offer a unique system to search signatures of LV due to the three factors: high neutrino energy, long propagation distance, and the presence of quantum mechanical interference. In this brief review, we introduce tests of LV and summarize existing searches of LV using atmospheric and astrophysical neutrinos.

    hep-phastro-ph.HEUniverse(2021)·7 citations
  4. 04*

    Quantum walk approach to simulating parton showers

    Simon Williams🇬🇧 · Sarah Malik🇬🇧 · Michael Spannowsky🇬🇧 · Khadeejah Bepari🇬🇧

    This paper presents a novel quantum walk approach to simulating parton showers on a quantum computer. We demonstrate that the quantum walk paradigm offers a natural and more efficient approach to simulating parton showers on quantum devices, with the emission probabilities implemented as the coin flip for the walker, and the particle emissions to either gluons or quark pairs corresponding to the movement of the walker in two dimensions. A quantum algorithm is proposed for a simplified, toy model of a 31-step, collinear parton shower, hence significantly increasing the number of steps of the parton shower that can be simulated compared to previous quantum algorithms. Furthermore, it scales efficiently: the number of possible shower steps increases exponentially with the number of qubits, and the circuit depth grows linearly with the number of steps. Reframing the parton shower in the context of a quantum walk therefore brings dramatic improvements, and is a step towards extending the current quantum algorithms to simulate more realistic parton showers.

    hep-phhep-exquant-phPRD(2022)·65 citations
  5. 05*

    Dynamics of fast neutrino flavor conversions with scattering effects: a detailed analysis

    Hirokazu Sasaki🇺🇸 · Tomoya Takiwaki🇯🇵

    We calculate fast conversions of two flavor neutrinos by considering Boltzmann collisions of neutrino scatterings. In an idealized angular distribution of neutrinos with electron-lepton number crossing, we find that the collision terms of the neutrino scattering enhance the transition probability of fast flavor conversions as in the previous study. We analyze the dynamics of fast flavor conversions with collisions in detail based on the motion of polarization vectors in cylindrical coordinate analogous to a pendulum motion. The phase of the all polarization vector synchronizes in the linear evolution, and the phase deviation from the Hamiltonian governs the conversion of neutrino flavor. In the non-linear evolution, a closed orbit in the phase space is observed. The collision terms break the closed orbit and gradually make the phase space smaller. The flavor conversions are enhanced during this limit cycle. After the significant flavor conversion, all of the neutrino polarization vectors start to align with the z-axis owing to the collision effect within the time scale of the collision term irrespective of neutrino scattering angles. We also show the enhancement or suppression of the flavor conversions in various setups of the collision terms and verify consistency with previous studies. Though our analysis does not fully understand the dynamics of fast flavor conversion, the framework gives a new insight into this complicated phenomenon in further study.

    hep-phastro-ph.HEPTEP(2022)·51 citations
  6. 06*

    New angular (and other) cuts to improve the higgsino signal at the LHC

    Howard Baer🇺🇸 · Vernon Barger🇺🇸 · Dibyashree Sengupta🇹🇼 · Xerxes Tata🇺🇸

    Motivated by the fact that naturalness arguments strongly suggest that the SUSY-preserving higgsino mass parameter mu cannot be too far above the weak scale, we re-examine higgsino pair production in association with a hard QCD jet at the HL-LHC. We focus on \ell^+\ell^-+\eslt+j events from the production and subsequent decay, \tchi_2^0\to\tchi_1^0\ell^+\ell^-, of the heavier neutral higgsino. The novel feature of our analysis is that we suggest angular cuts to reduce the important background from Z(\to \tau\tau)+j events more efficiently than the m_{\tau\tau}^2<0 cut that has been used by the ATLAS and CMS collaborations. Other cuts, needed to reduce backgrounds from t\bar{t}, WWj and W/Z+\ell\bar{\ell} production, are also delineated. We plot out the reach of LHC14 for 300 and 3000~fb^{-1} and also show distributions that serve to characterize the higgsino signal, noting that higgsinos may well be the only superpartners accessible at LHC14 in a well-motivated class of natural SUSY models.

    hep-phPRD(2022)·27 citations
  7. 07*

    Three-loop soft anomalous dimensions in QCD

    Nikolaos Kidonakis🇺🇸

    I present results for soft anomalous dimensions through three loops for many QCD processes. In particular, I give detailed expressions for soft anomalous dimensions in various processes with electroweak and Higgs bosons as well as single top quarks and top-antitop pairs.

    hep-phhep-thSciPost Phys. Proc. 7, 046 (2022)·5 citations
  8. 08*

    Scotogenesis in Hybrid Textures of Neutrino Mass Matrix and Neutrinoless Double Beta Decay

    Ankush🇮🇳 · Monal Kashav🇮🇳 · Surender Verma🇮🇳 · B. C. Chauhan🇮🇳

    We study the connection between dark matter (DM) and neutrinoless double beta () decay in a scotogenic model with hybrid texture in the neutrino mass matrix. Characteristically, the framework allows to write all the non-zero elements of the mass matrix proportional to effective Majorana mass . The overall scale of the neutrino mass is found to be governed by non-zero . We have obtained interesting correlations of relic density of DM() with DM mass and . Using experimental value of DM relic density(), the DM mass , is found to be (1TeV) which is within reach of collider experiments. Specifically, for all five hybrid textures, the range of upper bound on DM mass is found to be (-)TeV. Another interesting feature of the model is the existence of lower bound on for all allowed hybrid textures except texture which can be probed in current and future decay experiments. With high sensitivities, these experiments shall establish the theoretical status of the proposed model. For example, the non-observation of decay down to the sensitivity eV will refute hybrid texture.

    hep-phPLB(2022)·12 citations
  9. 09*

    Insights into the nature of the

    Meng-Lin Du🇪🇸 · Zhi-Hui Guo🇨🇳 · J. A. Oller🇪🇸

    We study the nature of the recently observed by the LHCb collaboration by employing three methods based on the elastic effective-range expansion and the resulting size of the effective-range, the saturation of the compositeness relation and width of the resonance, and a direct fit to data involving the channels , and . We have also considered the addition of a CDD pole but this scenario can be discarded. Our different analyses clearly indicate the molecular nature of the with a clear dominant component. In relation with heavy-quark-spin symmetry our results also favor the actual existence of two resonances with (the lighter one) and (the heavier one) in the energy region of the . In the scenario of two-resonance for the , the inclusion of the channel is required for the their mass splitting and it allows one to determine the spin structures of the two resonances.

    hep-phhep-exPRD(2021)·49 citations
  10. 10*

    evolution of the light meson resonances

    Zhi-Hui Guo🇨🇳

    The variation of the resonance poles, i.e., the mass and width, originating from changing the values of , the number of the QCD colors, provide an intuitive theoretical method to discriminate the interior constituents of hadrons. Many different approaches, including unitarized chiral amplitudes, dispersive methods, quark models, linear-sigma-model-like framework, etc., have been widely used to determine the trajectories of the various resonance pole positions. We focus on the discussions of the light-flavor meson resonances in this work.

    hep-phhep-latEur.Phys.J.ST(2021)·3 citations
  11. 11*

    Investigation of meson-meson interaction

    Yuheng Wu🇨🇳 · Xin Jin🇨🇳 · Hongxia Huang🇨🇳 · Jialun Ping🇨🇳 · Xinmei Zhu🇨🇳

    In the framework of the quark delocalization color screening model, we investigate the meson-meson interaction in the fully light four-quark system . The calculation of the effective potentials of all the wave states shows that for most states the interaction between two vector mesons is attractive; the one between a pseudoscalar meson and a vector meson is repulsive or weakly attractive; and the one between two pseudoscalar mesons is always repulsive. However, there is still some exception. The interaction of the channel is attractive, while the one of the channel is repulsive. So it is difficult to use the wave state to explain the at present calculation. The wave states are more likely to be resonance states, which are worthy of investigating in future work. The study of the contribution of each interaction term shows that both the one-gluon exchange and the kinetic energy interaction are important in the interaction between two mesons. The study of the variation of the delocalization parameter indicates that the contribution of the kinetic energy relates to the intermediate-range attraction mechanism in QDCSM, which is achieved by the quark delocalization.

    hep-phPRC(2022)·3 citations
  12. 12*

    Double parton distributions out of bounds in colour space

    Markus Diehl🇩🇪 · Jonathan R. Gaunt🇬🇧 · Peter Plossl🇩🇪 · Paolo Pichini🇩🇪

    We investigate the positivity of double parton distributions with a non-trivial dependence on the parton colour. It turns out that positivity is not preserved by leading-order evolution from lower to higher scales, in contrast to the case in which parton colour is summed over. We also study the positivity properties of the distributions at small distance between the two partons, where they can be computed in terms of perturbative splitting kernels and ordinary parton densities.

    hep-phEPJC(2021)·10 citations
  13. 13*

    Enhancement of baryon-to-meson ratios around jets as a signature of medium response

    Ao Luo🇨🇳 · Ya-Xian Mao🇨🇳 · Guang-You Qin🇨🇳 · En-Ke Wang🇨🇳 · Han-Zhong Zhang🇨🇳

    We present a unique signal of jet-induced medium excitations: the enhancement of baryon-to-meson ratios around the quenched jets.To illustrate this, we study jet-particle correlations and the distributions of jet-induced identified particles with respect to the jet direction in Pb+Pb collisions at the LHC via a multi-phase transport model.We find a strong enhancement of baryon-to-meson ratios for associated particles at intermediate transverse momentum around the triggered jets in Pb+Pb collisions relative to p+p collisions, due to the coalescence of jet-excited medium partons.Since the lost energy from jets can diffuse to large angles, such baryon-to-meson-ratio enhancement is more pronounced for larger relative distance from the jet axis.We argue that the experimental confirmation of the enhancement of jet-induced baryon-to-meson ratios around the jets will provide an unambiguous evidence for the medium response to jet quenching in heavy-ion collisions.

    hep-phnucl-exnucl-thPLB(2023)·35 citations
  14. 14*

    Polarised W+j production at the LHC: a study at NNLO QCD accuracy

    Mathieu Pellen🇩🇪 · Rene Poncelet🇬🇧 · Andrei Popescu🇬🇧

    We study polarisation of W-bosons produced in association with one jet at the LHC. In particular, we provide all necessary theoretical ingredients for the precise extraction of polarisation fractions. To that end, we present new polarised predictions up to NNLO QCD accuracy employing the narrow-width approximation, in two phase spaces: inclusive and fiducial. We compare results in the fiducial phase space to a full off-shell computation as well as experimental data. Finally, we fit the polarisation fractions using shape templates and show that NNLO corrections significantly improve their determination.

    hep-phhep-exJHEP(2022)·23 citations
  15. 15*

    Induced fission-like process of hadronic molecular states

    Jun He🇨🇳 · Dian-Yong Chen🇨🇳 · Zhan-Wei Liu🇨🇳 · Xiang Liu🇨🇳

    In this work, we predict a new physical phenomenon, induced fission-like process and chain reaction of hadronic molecular states. As a molecular state, if induced by a meson, the can split into final state which is forbidden due to the spin-parity conservation. The breeding of the meson of the reaction, such as , makes the chain reaction of matter possible. We estimate the cross section of the meson induced fission-like process of into two mesons. With very small beam momentum of 1 eV, the total cross section reaches an order of 1000 b, and decreases rapidly with the increasing of beam momentum. With the transition of meson in molecular states to a meson, the can release large energy, which is acquired by the final mesons. The momentum distributions of the final mesons are analyzed. In the laboratory frame, the spectator meson in molecular state concentrates in the low momentum area. The energy from the transition frim to meson is mainly acquired by two scattered mesons. The results suggest that the meson environment will lead to the induced fission-like process and chain reaction of the . Such phenomenon can be extended to other hadronic molecular states.

    hep-phhep-exnucl-thChin.Phys.Lett.(2022)·5 citations
  16. 16*

    Geometry and causal flux in multi-loop Feynman diagrams

    German F. R. Sborlini🇩🇪

    In this review, we discuss recent developments concerning efficient calculations of multi-loop multi-leg scattering amplitudes. Inspired by the remarkable properties of the Loop-Tree Duality (LTD), we explain how to reconstruct an integrand level representation of scattering amplitudes which only contains physical singularities. These so-called causal representations can be derived from connected binary partitions of Feynman diagrams, properly entangled according to specific rules. We will focus on the detection of flux orientations which are compatible with causality, describing the implementation of a quantum algorithm to identify such configurations.

    hep-phhep-thRev.Mex.Fis.Suppl.(2022)·2 citations
  17. 17*

    Unification of Gauge Symmetries... including their breaking

    Andrei Angelescu🇩🇪 · Andreas Bally🇩🇪 · Simone Blasi🇧🇪 · Florian Goertz🇩🇪

    In this talk, we present a minimal viable scenario that unifies the gauge symmetries of the Standard Model (SM) and their breaking sector. Our Gauge-Higgs Grand Unification setup employs 5D warped space with a bulk gauge field that includes both a grand unified theory (GUT) and a Higgs sector as a scalar component of the 5D vector field, solving the hierarchy problem. By appropriately breaking the gauge symmetry on the boundaries of the extra dimension the issue of light exotic new states, appearing generically in such models, is eliminated and the SM fermion spectrum is naturally reproduced. The Higgs potential is computed at one-loop, finding straightforward solutions with a realistic GeV. The problem of proton decay is addressed by showing that baryon number is a hidden symmetry of the model. The presence of a scalar leptoquark and a scalar singlet is highlighted, which might play a role in solving further problems of the SM, allowing for example for electroweak baryogenesis. Finally, the and gauge bosons from GUTs are found at collider accessible masses, opening a window to the unification structure at low energies.

    hep-phPoS(2022)·5 citations
  18. 18*

    Chiral criticality and the role of repulsive interactions in hot hadronic matter

    Michał Marczenko🇵🇱 · Krzysztof Redlich🇵🇱 · Chihiro Sasaki🇵🇱

    We explore fluctuations of the net-baryon number density in hadronic matter at vanishing chemical potential. We discuss the interplay between chiral dynamics and repulsive interactions and their influence on the properties of these fluctuations near the chiral crossover in the parity doublet model. We find that the characteristic properties of cumulants are entirely linked to the critical chiral dynamics and cannot be reproduced in phenomenological models, which account only for repulsive interactions. Consequently, a description of the higher-order cumulants of the net-baryon density requires a self-consistent treatment of the chiral in-medium effects and repulsive interactions.

    hep-phPoS(2022)·0 citations
  19. 19*

    New oscillation and scattering constraints on the tau row matrix elements without assuming unitarity

    Peter B. Denton🇺🇸 · Julia Gehrlein🇺🇸

    The tau neutrino is the least well measured particle in the Standard Model. Most notably, the tau neutrino row of the lepton mixing matrix is quite poorly constrained when unitarity is not assumed. In this paper, we identify data sets involving tau neutrinos that improve our understanding of the tau neutrino part of the mixing matrix, in particular appearance in atmospheric neutrinos. We present new results on the elements of the tau row leveraging existing constraints on the electron and muon rows for the cases of unitarity violation, with and without kinematically accessible steriles. We also show the expected sensitivity due to upcoming experiments and demonstrate that the tau neutrino row precision may be comparable to the muon neutrino row in a careful combined fit.

    hep-phastro-ph.HEhep-exJHEP(2022)·29 citations
  20. 20*

    Tau Neutrino Identification in Atmospheric Neutrino Oscillations Without Particle Identification or Unitarity

    Peter B. Denton🇺🇸

    The largest tau neutrino dataset to date is IceCube's atmospheric tau neutrino appearance dataset containing tau neutrino and antineutrino events as determined by a fit to a standard three-flavor oscillation framework. On an event-by-event basis, however, it is impossible to know that any given event is a tau neutrino as they are identical to either an electron neutrino charged-current event or a neutral-current interaction of any active flavor. Nonetheless, we conclusively show that, using only the cascade sample even without knowledge of the oscillation parameters and without assuming that the lepton mixing matrix is unitary, tau neutrino identification is still possible and there is no viable scenario in which all of the tau neutrino candidates are actually electron neutrinos. This is primarily due to the matter effect and the tau lepton production threshold, as well as the fact that tau neutrinos are systematically reconstructed at a lower energy than electron neutrinos due to one or more outgoing neutrinos. This conclusively shows that it is possible for an atmospheric neutrino oscillation experiment to confirm that , , and are not all zero even with limited particle identification.

    hep-phhep-exPRD(2021)·12 citations
  21. 21*

    NNLO virtual and real leptonic corrections to muon-electron scattering

    E. Budassi🇮🇹 · C. M. Carloni Calame🇮🇹 · M. Chiesa🇮🇹 · C. L. Del Pio🇮🇹 · S. M. Hasan🇮🇹 · G. Montagna🇮🇹 · O. Nicrosini🇮🇹 · F. Piccinini🇮🇹

    The recently proposed MUonE experiment at CERN aims at providing a novel determination of the leading order hadronic contribution to the muon anomalous magnetic moment through the study of elastic muon-electron scattering at relatively small momentum transfer. The anticipated accuracy of the order of 10ppm demands for high-precision predictions, including all the relevant radiative corrections. The fixed-order NNLO radiative corrections due to the emission of virtual and real leptonic pairs are described and their numerical impact is discussed for typical event selections of the MUonE experiment, by means of the upgraded Monte Carlo code MESMER.

    hep-phhep-exJHEP(2021)·39 citations
  22. 22*

    Animating collider processes with Event-time-frame Format

    Leyun Gao🇨🇳 · Jing Peng🇨🇳 · Zilin Dai🇨🇳 · Sitian Qian🇨🇳 · Tao Li🇨🇳 · Qiang Li🇨🇳 · Meng Lu🇨🇳

    High Energy Physics processes, such as hard scattering, parton shower, and hadronization, occur at colliders around the world, e.g., the Large Hadron Collider in Europe. The various steps are also components within corresponding Monte-Carlo simulations. They are usually considered to occur in an instant and displayed in MC simulations as intricate paths hard-coded with the HepMC format. We recently developed a framework to convert HEP event records into online 3D animations, aiming for visual Monte-Carlo studies and science popularization, where the most difficult parts are about designing an event timeline and particles' movement. As a by-product, we propose here an event-time-frame format for animation data exchanging and persistence, which is potentially helpful in other visualization works. The code is maintained at https://github.com/lyazj/hepani, and the web service is available at https://ppnp.pku.edu.cn/hepani/index.html.

    hep-phhep-exphysics.ed-phComput.Phys.Commun.(2022)·0 citations
  23. 23*

    High energy lepton colliders as the ultimate Higgs microscopes

    Shankha Banerjee🇨🇭 · Rick S. Gupta🇬🇧 · Oscar Ochoa-Valeriano🇬🇧 · Michael Spannowsky🇬🇧

    We study standard electroweak/Higgs processes at the high-energy lepton colliders ILC and CLIC. We identify a subset of three operators in the SMEFT that give leading contributions to these processes at high energies. We then perform a `high-energy fit' including these operators. Our final bounds surpass existing LEP bounds and HL-LHC projections by orders of magnitude. Furthermore, we find that these colliders can probe scales up to tens of TeV, corresponding to the highest scales explored in electroweak/Higgs physics.

    hep-phhep-exJHEP(2022)·5 citations
  24. 24*

    Precision Calculation of Inflation Correlators at One Loop

    Lian-Tao Wang🇺🇸 · Zhong-Zhi Xianyu🇨🇳 · Yi-Ming Zhong🇺🇸

    We initiate a systematic study of precision calculation of the inflation correlators at the 1-loop level, starting in this paper with bosonic 1-loop bispectrum with chemical-potential enhancement. Such 1-loop processes could lead to important cosmological collider observables but are notoriously difficult to compute due to the lack of symmetries. We attack the problem from a direct numerical approach based on the real-time Schwinger-Keldysh formalism and show full numerical results for arbitrary kinematics containing both the oscillatory "signals" and the "backgrounds". Our results show that, while the non-oscillatory part can be one to two orders of magnitude larger, the oscillatory signal can be separated out by applying appropriate high-pass filters. We have also compared the result with analytic estimates typically adopted in the literature. While the amplitude is comparable, there is a non-negligible deviation in the frequency of the oscillatory part away from the extreme squeezed limit.

    hep-phastro-ph.COhep-thJHEP(2022)·73 citations
  25. 25*

    Energy-weighted Message Passing: an infra-red and collinear safe graph neural network algorithm

    Partha Konar🇮🇳 · Vishal S. Ngairangbam🇮🇳 · Michael Spannowsky🇬🇧

    Hadronic signals of new-physics origin at the Large Hadron Collider can remain hidden within the copiously produced hadronic jets. Unveiling such signatures require highly performant deep-learning algorithms. We construct a class of Graph Neural Networks (GNN) in the message-passing formalism that makes the network output infra-red and collinear (IRC) safe, an important criterion satisfied within perturbative QCD calculations. Including IRC safety of the network output as a requirement in the construction of the GNN improves its explainability and robustness against theoretical uncertainties in the data. We generalise Energy Flow Networks (EFN), an IRC safe deep-learning algorithm on a point cloud, defining energy weighted local and global readouts on GNNs. Applying the simplest of such networks to identify top quarks, W bosons and quark/gluon jets, we find that it outperforms state-of-the-art EFNs. Additionally, we obtain a general class of graph construction algorithms that give structurally invariant graphs in the IRC limit, a necessary criterion for the IRC safety of the GNN output.

    hep-phJHEP(2022)·40 citations
  26. 26*

    Uncertainties due to hadronic production in final-state interactions at long-baseline neutrino facility

    Ritu Devi🇮🇳 · Jaydip Singh🇮🇳 · Baba Potukuchi🇮🇳

    Recent neutrino oscillation experiments used high atomic number nuclear targets to attain sufficient interaction rates. The use of these complex targets introduced systematic uncertainties due to the nuclear effects in the experimental observables and need to be measured properly to pin down the discovery. Through this simulation work, we are trying to quantify the nuclear effects in the argon (Ar) target in comparison to hydrogen (H) target which are proposed to be used at Deep Underground Neutrino Experiment far detector and near detector, respectively. Generates Events for Neutrino Interaction Experiments and NuWro, two neutrino event generators, are used to construct final state kinematics. To quantify the systematic uncertainties in the observables, we present the ratio of the oscillation probability (P(Ar)/P(H)) as a function of reconstructed neutrino energy.

    hep-phUkr.Phys.J.(2022)·1 citation
  27. 27*

    Constraints on Kerr-Newman black holes from merger-ringdown gravitational-wave observations

    Gregorio Carullo🇮🇹 · Danny Laghi🇮🇹 · Nathan K. Johnson-McDaniel🇬🇧 · Walter Del Pozzo🇮🇹 · Oscar J.C. Dias🇬🇧 · Mahdi Godazgar🇬🇧 · Jorge E. Santos🇬🇧

    We construct a template to model the post-merger phase of a binary black hole coalescence in the presence of a remnant charge. We include the quasi-normal modes typically dominant during a binary black hole coalescence, and also present analytical fits for the quasinormal mode frequencies of a Kerr-Newman black hole in terms of its spin and charge, here also including the mode. Aside from astrophysical electric charge, our template can accommodate extensions of the Standard Model, such as a dark photon. Applying the model to LIGO-Virgo detections, we find that we are unable to distinguish between the charged and uncharged hypotheses from a purely post-merger analysis of the current events. However, restricting the mass and spin to values compatible with the analysis of the full signal, we obtain a 90th percentile bound on the black hole charge-to-mass ratio, for the most favorable case of GW150914. Under similar assumptions, by simulating a typical loud signal observed by the LIGO-Virgo network at its design sensitivity, we assess that this model can provide a robust measurement of the charge-to-mass ratio only for values ; here we also assume that the mode amplitudes are similar to the uncharged case in creating our simulated signal. Lower values, down to , could instead be detected when evaluating the consistency of the pre-merger and post-merger emission.

    gr-qcastro-ph.HEhep-phPRD(2022)·88 citations
  28. 28*

    A proposal for the Yang-Mills vacuum and mass gap

    Dimitrios Metaxas🇬🇷

    I examine a set of Feynman rules, and the resulting effective action, that were proposed in order to incorporate the constraint of Gauss's law in the perturbation expansion of gauge field theories. A set of solutions for the Lagrangian and Hamiltonian equations of motion in Minkowski space-time, as well as their stability, are investigated. A discussion of the Euclidean action, confinement, and the strong-CP problem is also included. The properties and symmetries of the perturbative and the confining vacuum are explored, as well as the possible transitions between them, and the relations with phenomenological models of the strong interactions.

    hep-thhep-lathep-phmath-ph+1EPJC(2022)·3 citations
  29. 29*

    Phase transitions between confinement and higgs phases in SQCD with quark flavors

    Victor L. Chernyak🇷🇺

    Considered is 4-dimensional supersymmetric QCD (SQCD) with equal mass quark flavors in the fundamental representation. The gauge invariant order parameter is introduced distinguishing confinement (with ) and higgs (with ) phases. Using a number of independent arguments for different variants of transition between the confinement and higgs regimes, it is shown that transitions between these regimes are not crossovers but the phase transitions. Besides, it is argued that these phase transitions are of the first order. This is opposite to the conclusion of the paper of E. Fradkin and S.H. Shenker [10] that the transition between the confinement and higgs regimes is the crossover, not the phase transition. And although the theories considered in this paper and in [10] are different, an experience shows that there is a widely spread opinion that the conclusion of [10] is applicable to all QCD-like theories: both lattice and continuum, both not supersymmetric and supersymmetric. This opinion is in contradiction with the results of this paper.

    hep-thhep-lathep-ph4 citations
  30. 30*

    Potential reconstruction from general power spectrum in single-field inflation

    Ki-Young Choi🇰🇷 · Jinn-Ouk Gong🇰🇷 · Su-beom Kang🇰🇷 · Rathul Nath Raveendran🇰🇷

    We suggest a new method to reconstruct, within canonical single-field inflation, the inflaton potential directly from the primordial power spectrum which may deviate significantly from near scale-invariance. Our approach relies on a more generalized slow-roll approximation than the standard one, and can probe the properties of the inflaton potential reliably. We give a few examples for reconstructing potential and discuss the validity of our method.

    astro-ph.COgr-qchep-phJCAP(2022)·4 citations
  31. 31*

    Strong isospin breaking in Sp(4) gauge theory

    Axel Maas🇦🇹 · Fabian Zierler🇦🇹

    A hidden strongly-interacting sector is a possible candidate for dark matter. One scenario consistent with astrophysical constraints is a QCD-like theory with gauge group Sp(4) and two fundamental non-degenerate fermions. We report exploratory investigations of the light spectrum and decay constants for this theory using lattice calculations.

    hep-lathep-phPoS(2022)·25 citations
  32. 32*

    Non-extensive statistical distributions of charmed meson production in Pb-Pb and pp() collisions

    Yuan Su🇨🇳 · Xiaolong Chen🇨🇳 · Yongjie Sun🇨🇳 · Yifei Zhang🇨🇳

    The mid-rapidity transverse-momentum spectra of charmed meson in Pb-Pb and pp() collisions are analyzed by Tsallis-Pareto distribution derived from non-extensive statistics. We perform uniform descriptions for both small and large systems over a wide range of collision energy and hadron transverse momentum. By establishing the relation between the event multiplicity and the Tsallis parameters, we observe that there is significant linearity between thermal temperature and Tsallis-q parameter in Pb-Pb collisions at = 2.76 TeV and 5.02 TeV. And the slope of the T (q - 1) parameter is positively correlated with the hadron mass. In addition, the charm mesons have higher thermal temperature than the light hadrons at the same q - 1, indicating that charmed flavor requires a higher temperature to achieve the same degree of non-extensive as light flavors in the heavy-ion collision. The same fit is performed to the transverse momentum spectra of charmed meson in pp() collision over a large energy range with Tsallis-Pareto distribution. It is found that the thermal temperature increases with system energy while the q parameter shows a saturated trend and stops at pp() limit, q - 1 = 0.142 0.010. Meanwhile, the results of most peripheral Pb-Pb collisions are found to approach the pp() limit, which suggests that less medium effect and more in similarity with pp() collisions are found in more peripheral heavy-ion collisions.

    hep-exhep-phNucl.Sci.Tech.(2021)·17 citations
  33. 33*

    Cosmological implications of generalized holonomy corrections

    Cyril Renevey🇫🇷 · Killian Martineau🇫🇷 · Aurélien Barrau🇫🇷

    Most of the phenomenology of loop quantum gravity in the cosmological sector is based on the so-called holonomy correction to the Hamiltonian constraint. It straightforwardly modifies the Friedmann equations. In this work, we investigate the influence of corrections generalizing the one usually used in loop quantum cosmology. We find that a long enough inflation phase can be generated by purely quantum geometrical effects but we also underline the limitations of this scenario. In addition, we study the effects of generalized holonomy corrections on an inflationary phase generated by a massive scalar field. At the level of perturbations, we investigate in details the consequences on the primordial scalar power spectrum.

    gr-qchep-phPRD(2022)·11 citations
  34. 34*

    Neutrino Flavor Pendulum Reloaded: The Case of Fast Pairwise Conversion

    Ian Padilla-Gay🇩🇰 · Irene Tamborra (Niels Bohr Institute)🇩🇰 · Georg G. Raffelt (Max Planck Institute for Physics)🇩🇪

    In core-collapse supernovae or compact binary merger remnants, neutrino-neutrino refraction can spawn fast pair conversion of the type (with ), governed by the angle-dependent density matrices of flavor lepton number. In a homogeneous and axially symmetric two-flavor system, all angle modes evolve coherently, and we show that the nonlinear equations of motion are formally equivalent to those of a gyroscopic pendulum. Within this analogy, our main innovation is to identify the elusive characteristic of the lepton-number angle distribution that determines the depth of conversion with the "pendulum spin." The latter is given by the real part of the eigenfrequency resulting from the linear normal-mode analysis of the neutrino system. This simple analogy allows one to predict the depth of flavor conversion without solving the nonlinear evolution equations. Our approach provides a novel diagnostic tool to explore the physics of nonlinear systems.

    astro-ph.HEhep-phPRL(2022)·89 citations
  35. 35*

    Axiverse Strings

    John March-Russell🇬🇧 · Hannah Tillim🇬🇧

    If the QCD axion solves the strong CP problem then light axion-like-particles (ALPs) are expected to be ubiquitous in string theory - the string axiverse. Such ALPs can be the QCD axion and constitute dark matter (DM) or radiation, quintessence, and lead to new forces. String ALPs are also expected to give rise to a multiplicity of cosmologically important global axion strings. We study the properties of these axiverse cosmic strings including the vital effects of moduli stabilization, and find that the string cores provide `portals' to different decompactifications - to be precise, the cores explore the large Kähler or complex structure boundary of moduli space. As usual for global strings the tension with inter-string separation, , while can be small . At long distances from the string there are potential new signatures involving variations in Standard Model (SM) parameters (Yukawa couplings, gauge couplings, masses) and equivalence principle violations.

    hep-thastro-ph.COgr-qchep-ph25 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.