Wed·Jun 22, 2022Wednesday·June 22, 2022

1. 01*

   Tachyonic AdS/QCD, Determining the Strong Running Coupling and \beta-function in both UV and IR Regions of AdS Space

   Adamu Issifu🇧🇷 · Elijah A. Abbey🇧🇷 · Francisco A. Brito🇧🇷

   In this paper, we investigate the Quantum Chromodynamics (QCD)-like running coupling, ${\alpha }_s^{AdS}(Q^2)$, and its associated $\beta$-function within a tachyonic Anti-de Sitter (AdS)/QCD framework. The ${\text{AdS}}_5$ bulk geometry is deformed through the introduction of a color dielectric function $G(\varphi (z))$, associated with a tachyon field $\varphi (z)$. This function governs the behavior of ${\alpha }_s^{AdS}(Q^2)$ across all momentum scales by modifying the AdS background at both small and large values of the holographic coordinate $z$.In the ultraviolet (UV) regime (small $z$), the deformation is driven by free tachyons and reproduces features consistent with perturbative QCD. In contrast, in the infrared (IR) regime (large $z$), tachyon condensation dominates, yielding behavior characteristic of nonperturbative QCD. This construction enables a unified description of the running coupling and its $\beta$-function over the full range of momentum transfer $Q^2$, where $Q^2$ denotes the space-like momentum scale.

   hep-ph0 citations
2. 02*

   Novel effects of the $W$-boson mass shift in the 3-3-1 model

   Duong Van Loi🇻🇳 · Phung Van Dong🇻🇳

   The recent precision measurement of the $W$-boson mass reveals an exciting hint for the new physics as of the 3-3-1 model. We indicate that the 3-3-1 model contains distinct sources by itself that may cause the $W$-mass deviation, as measured, such as the tree-level $Z$-$Z^{\prime }$ mixing, the tree-level $W$-$Y$ and $Z$-$Z^{\prime }$-$X$ mixings, as well as the non-degenerate gauge vector $(X,Y)$ and new Higgs doublets. We point out that the gauge vector doublet negligibly contributes to this mass shift, whereas the rest of the effects with tree-level mixings governed by $Z$-$Z^{\prime }$ and new Higgs doublets are significant. A discussion of scalar sextet contributions is also given.

   hep-phEPJC(2023)·19 citations
3. 03*

   Mass spectra and decay properties of the higher excited $\rho$ mesons

   Xue-Chao Feng🇨🇳 · Zheng-Ya Li🇨🇳 · De-Min Li🇨🇳 · Qin-Tao Song🇨🇳 · En Wang🇨🇳 · Wen-Chen Yan🇨🇳

   Although there are some experimental hints for the higher excited $\rho$ mesons, our knowledge of their properties is much poor theoretically. Based on our recent work about excited $\rho$ mesons [Phys.Rev.D104(2021)034013], we present the mass spectra and decay properties of the higher excited $\rho$ mesons with the modified Godfrey-Isgur quark model and the ${}^3{P}_0$ strong decay model, and compare our predictions with the experimental hints, which should be helpful to search for these higher excited $\rho$ mesons.

   hep-phPRD(2022)·14 citations
4. 04*

   Exclusive $J/\psi$ and ${\rm Y}$ production in high energy $pp$ and $p$Pb collisions

   Chris A. Flett🇫🇮 · Stephen P. Jones🇬🇧 · Alan D. Martin🇬🇧 · Misha G. Ryskin🇬🇧 · Thomas Teubner🇬🇧

   We present a formalism for determining the cross section for exclusive heavy vector meson production ($J/\psi ,{\rm Y}$) as a function of rapidity, in both high energy proton-proton and proton-heavy ion collisions, at next-to-leading order in QCD. We compare and contrast the production in $pp$ and $p$Pb collisions and show how data for these processes can give information on the low $x$ gluon distribution of the proton and heavy ions at a range of different scales.

   hep-phPRD(2022)·9 citations
5. 05*

   Parametrization of transition energy-momentum tensor form factors

   June-Young Kim🇩🇪

   While the Lorentz structures of the $N\to \Delta$ transition matrix element of the vector current is well-known, that of the symmetric energy-momentum tensor current is unknown. In this letter, we first reproduce the Lorentz structures of the ${\frac{1}{2}}^{\pm }\to {\frac{1}{2}}^{\pm }$, ${\frac{1}{2}}^{\mp }\to {\frac{1}{2}}^{\pm }$, and ${\frac{1}{2}}^{\mp }\to {\frac{3}{2}}^{\pm }$ transition matrix elements of the vector current. We also repeat the parametrizations of the symmetric energy-momentum tensor current for the ${\frac{1}{2}}^{\pm }\to {\frac{1}{2}}^{\pm }$ and ${\frac{1}{2}}^{\mp }\to {\frac{1}{2}}^{\pm }$ transitions. We then consider both ${\frac{1}{2}}^{\pm }\to {\frac{3}{2}}^{\pm }$ and ${\frac{1}{2}}^{\mp }\to {\frac{3}{2}}^{\pm }$ matrix elements of the symmetric energy-momentum tensor current (say, $N\to \Delta$ transition) for the first time. We found that there are five independent conserved and four independent non-conserved energy-momentum tensor form factors.

   hep-phPLB(2022)·23 citations
6. 06*

   Relativistic description of the semileptonic decays of bottom mesons

   R. N. Faustov🇷🇺 · V. O. Galkin🇷🇺 · Xian-Wei Kang🇨🇳

   The form factors of the semileptonic $B$, $B_s$ and $B_c$ meson decays are calculated in the framework of the relativistic quark model based on the quasipotential approach in QCD. They are expressed through the overlap integrals of the meson wave function. All relativistic effects are consistently taken into account. The momentum transfer $q^2$ behavior of form factors is determined in the whole accessible kinematical range. We do not use any extrapolations, heavy quark $1/m_Q$ expansion or model assumptions about the shape of form factors. Convenient analytic expressions of the form factors are given, which very accurately reproduce the numerical results of our calculation. On the basis of these form factors and helicity formalism, the differential and total branching fractions of various semileptonic decays of bottom meson are calculated. The mean values of the forward-backward asymmetry $⟨A_{FB}⟩$, lepton-side convexity parameter $⟨C_F^{\ell }⟩$, longitudinal $⟨P_L^{\ell }⟩$ and transverse $⟨P_T^{\ell }⟩$ polarization of the charged lepton, and the longitudinal polarization fraction $⟨F_L⟩$ for final-state vector meson are also evaluated. We present a detailed comparison of the obtained predictions with the calculations based on the covariant light-front quark model and confront them to available lattice QCD and experimental data. It is found that although both models predict close values of the total branching fractions, the differential distributions and forward-backward asymmetry and polarization parameters differ significantly, especially for the heavy-to-light semileptonic decays. We identify observables which measurement can help to discriminate between models.

   hep-phhep-exPRD(2022)·26 citations
7. 07*

   Extracting the best physics sensitivity from T2HKK: A study on optimal detector volume

   Papia Panda🇮🇳 · Monojit Ghosh🇮🇳 · Priya Mishra🇮🇳 · Rukmani Mohanta🇮🇳

   T2HK is an upcoming long-baseline experiment in Japan which will have two water Cherenkov detector tanks of 187 kt volume each at distance of 295 km from the source. An alternative project, T2HKK is also under consideration where one of the water tanks will be moved to Korea at a distance of 1100 km. The flux at 295 km will cover the first oscillation maximum and the flux at 1100 km will mainly cover the second oscillation maximum. As physics sensitivity at the dual baseline rely on variation in statistics, dependence of systematic uncertainty, effect of second oscillation maximum and matter density, 187 kt detector volume at 295 km and 187 kt detector volume at 1100 km may not be the optimal configuration of T2HKK. Therefore, we have tried to optimize the ratio of the detector volume at both the locations by studying the interplay between the above mentioned parameters. For the analysis of neutrino mass hierarchy, octant of ${\theta }_{23}$ and CP precision, we have considered two values of ${\delta }_{\mathrm{CP}}$ as 270${}^{\circ }$ and $0^{\circ }$ and for CP violation we have considered the value of ${\delta }_{\mathrm{CP}}=270^{\circ }$. These values are motivated by the current best-fit values of this parameter as obtained from the experiments T2K and NO$\nu$A. Interestingly we find that if the systematic uncertainty is negligible then the T2HK setup i.e., when both the detector tanks are placed at 295 km gives the best results in terms of hierarchy sensitivity at ${\delta }_{\mathrm{CP}}=270^{\circ }$, octant sensitivity, CP violation sensitivity and CP precision sensitivity at ${\delta }_{\mathrm{CP}}=0^{\circ }$. For current values of systematic errors, we find that neither T2HK, nor T2HKK setup is giving better results for hierarchy, CP violation and CP precision sensitivity. The optimal detector volume which is of the range between 255 kt to 345 kt at 1100 km gives better results in those above mentioned parameters.

   hep-phhep-exPRD(2022)·8 citations
8. 08*

   Phase effect and symmetry on pair production in spatially inhomogeneous frequency chirping electric fields

   Melike Mohamedsedik🇨🇳 · Lie-Juan Li🇨🇳 · Li Wang🇨🇳 · Orkash Amat🇨🇳 · Li-Na Hu🇨🇳 · B. S. Xie🇨🇳

   Effect of the carrier envelop phase on the electron-positron pair production is studied in spatially inhomogeneous electric field with symmetrical frequency chirping. In high or low original frequency field without chirping as well as one with chirping, we find that the strength of interference effect of the momentum spectrum and the reduced particle number are all changeable periodically with phase, in particular, these periodical changes are more sensitive to the applied parameters in case of low frequency field. At the small spatial scale, the reduced particle number change is over one order magnitude by phase in small chirping. For the reduced particle number, the different optimal phases are obtained at different spatial scales, however, the larger the chirping is applied, the higher the created pair number is got. Interestingly, some different types of symmetries, i.e., the mutual symmetry of mirror/coincidence for two correlated phases and the individual self symmetry for single phase, are unfolded on the momentum spectrum. The physical reason of the mutual symmetry between two correlated phases and also the individual symmetry for two fixed specific phases are examined and discussed analytically in detail. The combined roles by phase and chirping on the periodic and symmetrical behaviors of the momentum spectrum and the reduced particle number are expected to have the potential extension to more fields such as that with multidimensional spatial coordinate.

   hep-phquant-ph0 citations
9. 09*

   Nonlinear Compton scattering and nonlinear Breit-Wheeler pair production including the damping of particle states

   Tobias Podszus🇩🇪 · Victor Dinu🇷🇴 · Antonino Di Piazza🇩🇪

   In the presence of an electromagnetic background plane-wave field, electron, positron, and photon states are not stable, because electrons and positrons emit photons and photons decay into electron-positron pairs. This decay of the particle states leads to an exponential damping term in the probabilities of single nonlinear Compton scattering and nonlinear Breit-Wheeler pair production. In this paper we investigate analytically and numerically the probabilities of nonlinear Compton scattering and nonlinear Breit-Wheeler pair production including the particle states' decay. For this we first compute spin- and polarization-resolved expressions of the probabilities, provide some of their asymptotic behaviors and show that the results of the total probabilities are independent of the spin and polarization bases. Then, we present several plots of the total and differential probabilities for different pulse lengths and for different spin and polarization quantum numbers. We observe that it is crucial to take into account the damping of the states in order for the probabilities to stay always below unity and we show that the damping factors also scale with the intensity and pulse duration of the background field. In the case of nonlinear Compton scattering we show numerically that the total probability behaves like a Poissonian distribution in the regime where the photon recoil is negligible. In all considered cases, the kinematic conditions are such that the final particles momenta transverse to the propagation direction of the plane wave are always much smaller than the particles longitudinal momenta and the main spread of the momentum distribution on the transverse plane is along the direction of the plane-wave electric field.

   hep-phPRD(2022)·14 citations
10. 10*

    Next-to-leading-order QCD Corrections to Higgs Production in association with a Jet

    R. Bonciani🇮🇹 · V. Del Duca🇨🇭 · H. Frellesvig🇩🇰 · M. Hidding🇸🇪 · V. Hirschi🇨🇭 · F. Moriello🇨🇭 · G. Salvatori🇺🇸 · G. Somogyi🇭🇺 · F. Tramontano🇮🇹

    We compute the next-to-leading-order (NLO) QCD corrections to the Higgs pT distribution in Higgs production in association with a jet via gluon fusion at the LHC, with exact dependence on the mass of the quark circulating in the heavy-quark loops. The NLO corrections are presented including the top-quark mass, and for the first time, the bottom-quark mass as well. Further, besides the on-shell mass scheme, we consider for the first time a running mass renormalisation scheme. The computation is based on amplitudes which are valid for arbitrary heavy-quark masses.

    hep-phhep-exPLB(2023)·46 citations
11. 11*

    Theoretical results for hadronic masses and their widths in the framework of the SO(4) model

    Tochtli Yepez Martinez🇲🇽 · Osvaldo Civitarese🇦🇷 · Peter Hess🇲🇽 · Octavio Rico-Trejo🇲🇽 · Ulises Ramirez-Soto🇲🇽

    The prediction of properties of the low energy portion of the hadronic spectrum is a challenging task which, up to day, is still tentatively given due to the non-perturbative nature of QCD at low energies. In this paper we are exploring the validity of the SO(4) scheme, as representative of the fundamental QCD structure of meson-like states in the region below 2.5 GeV. We have focussed the attention in the calculation of the energy and width of states of various spin, isospin and parities. The theoretical results are compared, sistematically, to the available experimental information.

    hep-phIJMPE(2022)·1 citation
12. 12*

    Spin-2 Kaluza-Klein Scattering in a Stabilized Warped Background

    R. Sekhar Chivukula🇺🇸 · Dennis Foren🇺🇸 · Kirtimaan A. Mohan🇺🇸 · Dipan Sengupta🇺🇸 · Elizabeth H. Simmons🇺🇸

    Scattering amplitudes involving massive spin-2 particles typically grow rapidly with energy. In this paper we demonstrate that the anomalous high-energy growth of the scattering amplitudes cancel for the massive spin-2 Kaluza-Klein modes arising from compactified five-dimensional gravity in a stabilized warped geometry. Generalizing previous work, we show that the two sum rules which enforce the cancellations between the contributions to the scattering amplitudes coming from the exchange of the (massive) radion and those from the exchange of the tower of Goldberger-Wise scalar states (admixtures of the original gravitational and scalar fields of the theory) still persist in the case of the warping which would be required to produce the hierarchy between the weak and Planck scales in a Randall-Sundrum model. We provide an analytic proof of one combination of these generalized scalar sum rules, and show how the sum rule depends on the Einstein equations determining the background geometry and the mode-equations and normalization of the tower of physical scalar states. Finally, we provide a consistent and self-contained derivation of the equations governing the physical scalar modes and we list, in appendices, the full set of sum rules ensuring proper high-energy growth of all $2\to 2$ massive spin-2 scattering amplitudes.

    hep-phgr-qchep-thPRD(2023)·17 citations
13. 13*

    A new life for sterile neutrino dark matter after the pandemic

    Torsten Bringmann🇳🇴 · Paul Frederik Depta🇩🇪 · Marco Hufnagel🇧🇪 · Jörn Kersten🇰🇷 · Joshua T. Ruderman🇺🇸 · Kai Schmidt-Hoberg🇩🇪

    We propose a novel mechanism to generate sterile neutrinos ${\nu }_s$ in the early Universe, by converting ordinary neutrinos ${\nu }_{\alpha }$ in scattering processes ${\nu }_s{\nu }_{\alpha }\to {\nu }_s{\nu }_s$. After initial production by oscillations, this leads to an exponential growth in the ${\nu }_s$ abundance. We show that such a production regime naturally occurs for self-interacting ${\nu }_s$, and that this opens up significant new parameter space where ${\nu }_s$ make up all of the observed dark matter. Our results provide strong motivation to further push the sensitivity of X-ray line searches, and to improve on constraints from structure formation.

    hep-phPRD(2023)·46 citations
14. 14*

    Going off topics to demix quark and gluon jets in ${\alpha }_S$ extractions

    Matt LeBlanc🇨🇭 · Benjamin Nachman🇺🇸 · Christof Sauer🇩🇪

    Quantum chromodynamics is the theory of the strong interaction between quarks and gluons; the coupling strength of the interaction, ${\alpha }_S$, is the least precisely-known of all interactions in nature. An extraction of the strong coupling from the radiation pattern within jets would provide a complementary approach to conventional extractions from jet production rates and hadronic event shapes, and would be a key achievement of jet substructure at the Large Hadron Collider (LHC). Presently, the relative fraction of quark and gluon jets in a sample is the limiting factor in such extractions, as this fraction is degenerate with the value of ${\alpha }_S$ for the most well-understood observables. To overcome this limitation, we apply recently proposed techniques to statistically demix multiple mixtures of jets and obtain purified quark and gluon distributions based on an operational definition. We illustrate that studying quark and gluon jet substructure separately can significantly improve the sensitivity of such extractions of the strong coupling. We also discuss how using machine learning techniques or infrared- and collinear-unsafe information can improve the demixing performance without the loss of theoretical control. While theoretical research is required to connect the extract topics with the quark and gluon objects in cross section calculations, our study illustrates the potential of demixing to reduce the dominant uncertainty for the ${\alpha }_S$ extraction from jet substructure at the LHC.

    hep-phhep-exphysics.data-anJHEP(2023)·10 citations
15. 15*

    Inflection-point Inflation and Dark Matter Redux

    Anish Ghoshal🇵🇱 · Gaetano Lambiase🇮🇹 · Supratik Pal🇮🇳 · Arnab Paul🇮🇳 · Shiladitya Porey🇷🇺

    We investigate for viable models of inflation that can successfully produce dark matter (DM) from inflaton decay process, satisfying all the constraints from Cosmic Microwave Background (CMB) and from some other observations. In particular, we analyze near-inflection-point small field inflationary scenario with non-thermal production of fermionic DM from the decaying inflaton field during the reheating era. To this end, we propose two different models of inflation with polynomial potential. The potential of Model I contains terms proportional to linear, quadratic, and quartic in inflaton; whereas in Model II, the potential contains only even power of inflaton and the highest term is sextic in inflaton. For both the models, we find out possible constraints on the model parameters which lead to proper inflationary parameters from CMB data with a very small tensor-to-scalar ratio, as expected from a small-field model. With the allowed parameter space from CMB, we then search for satisfactory relic abundance for DM, that can be produced from inflaton via reheating, to match with the present-day cold dark matter (CDM) relic density for the parameter spaces of the DM $\chi$ mass and Yukawa couplings in the range $10^{-9}\gtrsim y_{\chi }\gtrsim 10^{-15}$ and $10^3\text{GeV}\lesssim m_{\chi }\lesssim 10^9\text{GeV}$. The DM relic is associated with the inflection-points in each model via maximum temperature reached in the early universe during its production. Finally, we find out allowed parameter space coming out of combined constraints from stability analysis for both SM Higgs and DM decays from inflaton as well as from BBN and Lyman-$\alpha$ bounds.

    hep-phastro-ph.COJHEP(2022)·15 citations
16. 16*

    Fate of false vacuum in non-perturbative regimes: Gravity effects

    Gianluca Calcagni🇪🇸 · Marco Frasca🇮🇹 · Anish Ghoshal🇵🇱

    A recent analysis of the false-vacuum decay in non-perturbative regimes is here extended in the presence of Einstein gravity, computing the corresponding effective potential and decay rate. We consider a $\lambda {\varphi }^4$ scalar field theory and we observe that, in comparison to the usual perturbative decay rate, the higher the coupling $\lambda$, the greater the decay probability. We evaluate the running of the self-interaction coupling and obtain a weakly coupled theory at lower energies, proving that Einstein gravity grants an even more reliable weak coupling approximation with the universe cooling down. We also provide an extended study of a non-minimal coupling $\xi$ of the scalar field with gravity showing how this term makes the false-vacuum decay more difficult. Minima can also disappear at large coupling $\xi$. We discuss possible applications of these results to cosmological phase transitions, gravitational-wave astronomy, and condensed matter systems.

    ↳ hep-thastro-ph.COastro-ph.HEgr-qc+1Int.J.Geom.Meth.Mod.Phys.(2026)·9 citations
17. 17*

    Gauge and Scalar Fields on ${\mathbb{CP}}^2$: A Gauge-invariant Analysis II. The measure for gauge fields and a 4d WZW theory

    Dimitra Karabali🇺🇸 · Antonina Maj🇺🇸 · V.P. Nair🇺🇸

    We consider the volume of the gauge orbit space for gauge fields on four-dimensional complex projective space. The analysis uses a parametrization of gauge fields where gauge transformations act homogeneously on the fields, facilitating a manifestly gauge-invariant analysis. The volume element contains a four-dimensional Wess-Zumino-Witten (WZW) action for a hermitian matrix-valued field. There is also a mass-like term for certain components of the gauge field. We discuss how the mass term could be related to results from lattice simulations as well as Schwinger-Dyson equations. We argue for a kinematic regime where the Yang-Mills theory can be approximated by the 4d-WZW theory. The result is suggestive of the instanton liquid picture of QCD. Further it is also indicative of the mechanism for confinement being similar to what happens in two dimensions.

    ↳ hep-thhep-phmath-phmath.MPPRD(2022)·5 citations
18. 18*

    Phase transitions in anisotropic graphene

    M.E. Carrington🇨🇦 · A.R. Frey🇨🇦 · B.A. Meggison🇨🇦

    We study the effect of anisotropy on phase transitions in graphene. We work with an low energy effective field theory which is strongly coupled, and solve a coupled set of Schwinger-Dyson equations. We show that the effect of anisotropy is to reduce the critical coupling.

    ↳ cond-mat.mes-hallhep-phInt.J.Mod.Phys.A(2022)·1 citation
19. 19*

    Frictionless UV-finite Instantons in Curved Spacetime

    Mulham Hijazi · Apostolos Pilaftsis

    We identify a new class of UV-complete instanton solutions that describe the false vacuum\- decay of a real scalar field in a particular curved spacetime background. To this end, we consider a simple scalar theory with a Coleman potential and calculate the Euclidean action $S_{\text{E}}$ by assuming an O(4)-symmetric curved spacetime. The function $a(r)$ dictating the geometry of spacetime may consistently be chosen to be a constant, thereby eliminating the drag forces from the equations of motion and ensuring that the gravitational backgrounds of both the false vacuum and bounce solutions are identical. By employing standard WKB and Gelfand-Yaglom methods, we compute the corresponding prefactor due to quantum fluctuations around this frictionless bounce solution which becomes UV finite after renormalization. The possible consequences of such frictionless UV-finite instantons are discussed.

    ↳ hep-thhep-ph0 citations
20. 20*

    Non-analytic Term in Effective Potential at Finite Temperature for Scalar Field on Compactified Space

    Makoto Sakamoto🇯🇵 · Kazunori Takenaga🇯🇵

    We study non-analytic terms, which cannot be written in the form of any positive integer power of field-dependent mass squared, in effective potential at finite temperature in one-loop approximation for a real scalar field on the $D$-dimensional space-time, $S_{\tau }^1\times R^{D-(p+1)}\times {\prod }_{i=1}^p{S}_i^1$. The effective potential can be recast into the integral form in the complex plane by using the integral representation for the modified Bessel function of the second kind and the analytical extension for multiple mode summations. The pole structure of the mode summations is clarified and all the non-analytic terms are obtained by the residue theorem. We find that the effective potential has a non-analytic term when the dimension of the flat Euclidean space, $D-(p+1)$ is odd. There appears only one non-analytic term for the given values of $D$ and $p$, for which the non-analytic term exists.

    ↳ hep-thhep-phPRD(2022)·2 citations
21. 21*

    Renormalised spectral flows

    Jens Braun🇩🇪 · Yong-rui Chen🇨🇳 · Wei-jie Fu🇨🇳 · Andreas Geißel🇩🇪 · Jan Horak🇩🇪 · Chuang Huang🇨🇳 · Friederike Ihssen🇩🇪 · Jan M. Pawlowski🇩🇪 · Manuel Reichert🇬🇧 · Fabian Rennecke🇩🇪 · Yang-yang Tan🇨🇳 · Sebastian Töpfel🇩🇪 · Jonas Wessely🇩🇪 · Nicolas Wink🇩🇪

    We derive renormalised finite functional flow equations for quantum field theories in real and imaginary time that incorporate scale transformations of the renormalisation conditions, hence implementing a flowing renormalisation. The flows are manifestly finite in general non-perturbative truncation schemes also for regularisation schemes that do not implement an infrared suppression of the loops in the flow. Specifically, this formulation includes finite functional flows for the effective action with a spectral Callan-Symanzik cutoff, and therefore gives access to Lorentz invariant spectral flows. The functional setup is fully non-perturbative and allows for the spectral treatment of general theories. In particular, this includes theories that do not admit a perturbative renormalisation such as asymptotically safe theories. Finally, the application of the Lorentz invariant spectral functional renormalisation group is briefly discussed for theories ranging from real scalar and Yukawa theories to gauge theories and quantum gravity.

    ↳ hep-thhep-phnucl-thSciPost Phys.Core(2023)·65 citations
22. 22*

    Testing universal dark-matter caustic rings with galactic rotation curves

    D. Davydov🇷🇺 · S. Troitsky🇷🇺

    Infall of cold dark matter on a galaxy may result in caustic rings where the particle density is enhanced. They may be searched for as features in the galactic rotation curves. Previous studies suggested the evidence for these caustic rings with universal, that is common for different galaxies, parameters. Here we test this hypothesis with a large independent set of rotation curves by means of an improved statistical method. No evidence for universal caustic rings is found in the new analysis.

    ↳ astro-ph.COhep-phPLB(2023)·1 citation
23. 23*

    Separating the impact of nuclear skin and nuclear deformation in high-energy isobar collisions

    Jiangyong Jia🇺🇸 · Giuliano Giacalone🇩🇪 · Chunjian Zhang🇺🇸

    Bulk nuclear structure properties, such as radii and deformations, leave distinct signatures in the final state of relativistic heavy-ion collisions. Isobaric collisions offer an easy route to establish explicit connections between the colliding nuclei's structure and the observable outcomes. Here, we investigate the effects of nuclear skin thickness and nuclear deformations on the elliptic flow ($v_2$) and its fluctuations in high-energy ${}^{96}$Ru+${}^{96}$Ru and ${}^{96}$Zr+${}^{96}$Zr collisions. Our findings reveal that the difference in skin thickness between these isobars only influences the inherent ellipticity of the collision systems, $v_2^{\mathrm{rp}}$. In contrast, differences in nuclear deformations solely impact the fluctuations of $v_2$ around $v_2^{\mathrm{rp}}$. Hence, we have identified a data-driven method to disentangle the effects of nuclear skin and nuclear deformations, marking a significant step toward assessing the consistency of nuclear phenomena across energy scales.

    ↳ nucl-thhep-phnucl-exPRL(2023)·74 citations
24. 24*

    Fundamental-mode eigenfrequencies of neutral and charged twin neutron stars

    Victor P. Goncalves🇧🇷 · José C. Jiménez🇧🇷 · Lucas Lazzari🇧🇷

    We investigate the effects of rapid and slow conversions on the fundamental-mode eigenfrequencies of hybrid neutron stars having highly discontinuous transitions between hadronic and quark matter, the so-called twin stars. We analyze some characteristic cases in the available parameter space of the equations of state for the hadronic and quark phases. Furthermore, we also consider the possibility that these stellar configurations are electrically charged. Our results indicate that for neutral configurations under rapid conversions the stability window coincides with the usual stability criterion, i.e. $\partial M/\partial p_c>0$ and that the two branches are disconnected. This discontinuity remains when electric charge is considered, but the usual criterion is not sufficient to determine the star's stability. On the other hand, slow conversions connect initially disconnected branches and increase the stability window of the hybrid configurations. For both conversion speeds, the presence of electric charge diminishes the magnitude of the eigenfrequencies and its stability window.

    ↳ nucl-thhep-phEPJC(2022)·10 citations
25. 25*

    A quantum information perspective on meson melting

    Mari Carmen Banuls🇩🇪 · Michal P. Heller🇧🇪 · Karl Jansen🇩🇪 · Johannes Knaute🇮🇱 · Viktor Svensson🇩🇪

    We propose to use quantum information notions to characterize thermally induced melting of nonperturbative bound states at high temperatures. We apply tensor networks to investigate this idea in static and dynamical settings within the Ising quantum field theory, where bound states are confined fermion pairs - mesons. An equilibrium signature of meson melting is identified in the temperature dependence of the thermal-state second Rényi entropy, which varies from exponential to power-law scaling. Out of equilibrium, we identify as the relevant signature the transition from an oscillatory to a linear growing behavior of reflected entropy after a thermal quench. These analyses apply more broadly, which brings new ways of describing in-medium meson phenomena in quantum many-body and high-energy physics.

    ↳ hep-thcond-mat.quant-gascond-mat.str-elhep-ph+1PRD(2023)·15 citations
26. 26*

    Probing Dark Matter with Strong Gravitational Lensing through an Effective Density Slope

    Atınç Çağan Şengül🇺🇸 · Cora Dvorkin🇺🇸

    Many dark matter (DM) models that are consistent with current cosmological data show differences in the predicted (sub)halo mass function, especially at sub-galactic scales, where observations are challenging due to the inefficiency of star formation. Strong gravitational lensing has been shown to be a useful tool for detecting dark low-mass (sub)halos through perturbations in lensing arcs, therefore allowing the testing of different DM scenarios. However, measuring the total mass of a perturber from strong lensing data is challenging. Over or underestimating perturber masses can lead to incorrect inferences about the nature of DM. In this paper, we argue that inferring an effective slope of the dark matter density profile, which is the power-law slope of perturbers at intermediate radii, where we expect the perturber to have the largest observable effect, is a promising way to circumvent these challenges. Using N-body simulations, we show that (sub)halo populations under different DM scenarios differ in their effective density slope distributions. Using realistic mocks of Hubble Space Telescope observations of strong lensing images, we show that the effective density slope of perturbers can be robustly measured with high enough accuracy to discern between different models. We also present our measurement of the effective density slope $\gamma =1.96\begin{array}{c}+0.12\\ -0.12\end{array}$ for the perturber in JVAS B1938+666, which we find to be a $2\sigma$ outlier of the cold dark matter scenario. More measurements of this kind are needed to be able to draw robust conclusions about the nature of dark matter.

    ↳ astro-ph.COastro-ph.GAhep-phMNRAS(2022)·38 citations
27. 27*

    QED medium effects in (anti)neutrino-nucleus and electron-nucleus scattering: elastic scattering on nucleons

    Oleksandr Tomalak🇺🇸 · Ivan Vitev🇺🇸

    Interpretation of current and future neutrino oscillation and electron scattering experiments requires knowledge of lepton-nucleon and lepton-nucleus interactions at the percent level. We study the exchange of photons between charged particles and the nuclear medium for (anti)neutrino-, electron-, and muon-induced reactions inside a large nucleus. While quantum electrodynamics (QED)-medium contributions are formally suppressed by two powers of the electromagnetic coupling constant $\alpha$ when compared to the leading-order cross sections, low-energy modes and the nuclear size enhance the effect by orders of magnitude. They require a proper infrared regularization, which we implement as a screening of the electromagnetic interactions at atomic length scales or above. We provide approximate analytic expressions for the distortion of (anti)neutrino-nucleus and charged lepton-nucleus cross sections and evaluate the QED-medium effects for realistic values of the screening scale on the example of elastic scattering with nucleons inside the nucleus. We find new permille- to percent-level effects, which were not considered in either (anti)neutrino-nucleus or electron-nucleus scattering.

    ↳ nucl-thhep-exhep-phnucl-exPLB(2022)·9 citations
28. 28*

    Exotic dark matter search with the Majorana Demonstrator

    I.J. Arnquist · F.T. Avignone III · A.S. Barabash · C.J. Barton · K.H. Bhimani · E. Blalock · B. Bos · M. Busch · M. Buuck · T.S. Caldwell · Y-D. Chan · C.D. Christofferson and 47 other authors

    With excellent energy resolution and ultra-low level radiogenic backgrounds, the high-purity germanium detectors in the Majorana Demonstrator enable searches for several classes of exotic dark matter (DM) models. In this work, we report new experimental limits on keV-scale sterile neutrino DM via the transition magnetic moment from conversion to active neutrinos, ${\nu }_s\to {\nu }_a$. We report new limits on fermionic dark matter absorption ($\chi +A\to \nu +A$) and sub-GeV DM-nucleus 3$\to$2 scattering ($\chi +\chi +A\to \varphi +A$), and new exclusion limits for bosonic dark matter (axionlike particles and dark photons). These searches utilize the (1--100)-keV low energy region of a 37.5-kg y exposure collected by the Demonstrator between May 2016 and November 2019, using a set of ${}^{76}$Ge-enriched detectors whose surface exposure time was carefully controlled, resulting in extremely low levels of cosmogenic activation.

    ↳ hep-exhep-phPRL(2024)·32 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.