Mon·Sep 11, 2023Monday·September 11, 2023

1. 01*

   The decomposed photon anomalous dimension in QCD and the $\{\beta \}$-expanded representations for the Adler function

   A.L.Kataev🇷🇺 · V.S.Molokoedov🇷🇺

   This work is devoted to the study of the $\{\beta \}$-expansion of the perturbative expressions for the $e^{+}{e}^{-}$ annihilation Adler function $D(Q^2)$ and for the related renormalization group functions, namely for the photon vacuum polarization function and its anomalous dimension $\gamma ({\alpha }_s)$ in QCD at the $\mathcal{O}({\alpha }_s^4)$ order. We emphasize that $\gamma ({\alpha }_s)$ is not a conformal-invariant contribution to $D(Q^2)$ and, therefore, for a consistent analysis it is necessary to decompose its higher-order PT coefficients in powers of the $\beta$-function coefficients in the same way as for the Adler function. The arguments in favor of this statement are given. The comparison of the $\overline{MS}$ and PMC/BLM approximants are demonstrated.Theoretical and phenomenologically related consequences of this comparison are briefly commented.

   hep-phhep-exhep-latPRD(2023)·5 citations
2. 02*

   Artificial first-order phase transition in a magnetized Nambu--Jona-Lasinio model with a quark anomalous magnetic moment

   William R. Tavares🇧🇷 · Sidney S. Avancini🇧🇷 · Ricardo L. S. Farias🇧🇷 · Rafael P. Cardoso🇧🇷

   Recently, first-order phase transitions have been predicted as an effect of the inclusion of quark anomalous magnetic moment (AMM) in the hot and magnetized Nambu--Jona-Lasinio model (NJL). These transitions appear in the chiral condensate for different combinations of AMM and magnetic fields and could lead to inverse magnetic catalysis. However, in this work, we show that the predicted first-order phase transitions are related to regularization-dependent issues. To show this, we explore, in the context of the vacuum magnetic regularization (VMR) scheme, two different scenarios: when mass-dependent (MD) and mass-independent (MI) terms are present in the subtraction of the divergences. In the MD case, as we increase the AMM value, it is observed the appearance of a nonmassive minimum in the thermodynamical potential, which induces a first-order phase transition from the massive minimum. We argue that the MD terms must be avoided in order to satisfy the predictions of Lattice QCD, and we propose a MI solution that is valid in the limit which the magnetic fields are smaller than the squared of vacuum effective quark mass.

   hep-phhep-lathep-thnucl-thPRD(2024)·13 citations
3. 03*

   Searching for new physics effects in future $W$ mass and ${\sin }^2{\theta }_W(Q^2)$ determinations

   Hooman Davoudiasl🇺🇸 · Kazuki Enomoto🇰🇷 · Hye-Sung Lee🇰🇷 · Jiheon Lee🇰🇷 · William J. Marciano🇺🇸

   We investigate the phenomenology of the dark $Z$ boson, $Z_d$, which is associated with a new Abelian gauge symmetry and couples to the standard model particles via kinetic mixing $\epsilon$ and mass mixing ${\epsilon }_Z^{}$. We examine two cases: (i) $Z_d$ is lighter than the $Z$ boson, and (ii) $Z_d$ is heavier than that. In the first case, it is known that $Z_d$ causes a deviation in the weak mixing angle at low energies from the standard model prediction. We study the prediction in the model and compare it with the latest experimental data. In the second case, the $Z$-$Z_d$ mixing enhances the $W$ boson mass. We investigate the effect of $Z_d$ on various electroweak observables including the $W$ boson mass using the $S$, $T$, and $U$ parameters. We point out an interesting feature: in the limit $\epsilon \to 0$, the equation $S=-U$ holds independently of the mass of $Z_d$ and the size of ${\epsilon }_Z^{}$, while $|S|\gg |U|$ in many new physics models. We find that the dark $Z$ boson with a mass of $O(100)\mathrm{GeV}$ with a relatively large mass mixing can reproduce the CDF result within $2\sigma$ while avoiding all other experimental constraints. Such dark $Z$ bosons are expected to be tested at future high-energy colliders.

   hep-phPRD(2023)·19 citations
4. 04*

   XENONnT and LUX-ZEPLIN constraints on DSNB-boosted dark matter

   Valentina De Romeri🇪🇸 · Anirban Majumdar🇮🇳 · Dimitrios K. Papoulias🇬🇷 · Rahul Srivastava🇮🇳

   We consider a scenario in which dark matter particles are accelerated to semi-relativistic velocities through their scattering with the Diffuse Supernova Neutrino Background. Such a subdominant, but more energetic dark matter component can be then detected via its scattering on the electrons and nucleons inside direct detection experiments. This opens up the possibility to probe the sub-GeV mass range, a region of parameter space that is usually not accessible at such facilities. We analyze current data from the XENONnT and LUX-ZEPLIN experiments and we obtain novel constraints on the scattering cross sections of sub-GeV boosted dark matter with both nucleons and electrons. We also highlight the importance of carefully taking into account Earth's attenuation effects as well as the finite nuclear size into the analysis. By comparing our results to other existing constraints, we show that these effects lead to improved and more robust constraints.

   hep-phastro-ph.COastro-ph.HEhep-exJCAP(2024)·29 citations
5. 05*

   Neutrino Phenomenology in a Model with Generalized CP symmetry within Type-I seesaw framework

   Tapender🇮🇳 · Sanjeev Kumar🇮🇳 · Surender Verma🇮🇳

   We investigate the consequences of generalized CP (GCP) symmetry within the context of the two Higgs doublet model (2HDM), specifically focusing on the lepton sector. Utilizing the Type-I seesaw framework, we study an intriguing connection between the Dirac Yukawa couplings originating from both Higgs fields, leading to a reduction in the number of independent Yukawa couplings and simplifying the scalar and Yukawa sectors when compared to the general 2HDM. The CP3 constraint results in two right-handed neutrinos having equal masses and leads to a diagonal right-handed Majorana neutrino mass matrix. Notably, CP symmetry experiences a soft break due to the phase associated with the vacuum expectation value of the second Higgs doublet. The model aligns well with observed charged lepton masses and neutrino oscillation data, explaining both masses and mixing angles, and yields distinct predictions for normal and inverted neutrino mass hierarchies. It features a novel interplay between atmospheric mixing angle ${\theta }_{23}$ and neutrino mass hierarchy: the angle ${\theta }_{23}$ is below maximal for the normal hierarchy and above maximal for inverted hierarchy. Another interesting feature of the model is inherent CP violation for the inverted hierarchy.

   hep-phPRD(2024)·4 citations
6. 06*

   Axion inflation in the strong-backreaction regime: decay of the Anber-Sorbo solution

   Richard von Eckardstein🇩🇪 · Marco Peloso🇮🇹 · Kai Schmitz🇩🇪 · Oleksandr Sobol🇩🇪 · Lorenzo Sorbo🇺🇸

   Axion inflation coupled to Abelian gauge fields via a Chern-Simons-like term of the form $\varphi F\tilde{F}$ represents an attractive inflationary model with a rich phenomenology, including the production of magnetic fields, black holes, gravitational waves, and the matter-antimatter asymmetry. In this work, we focus on a particular regime of axion inflation, the so-called Anber-Sorbo (AS) solution, in which the energy loss in the gauge-field production provides the dominant source of friction for the inflaton motion. We revisit the AS solution and confirm that it is unstable. Contrary to earlier numerical works that attempted to reach the AS solution starting from a regime of weak backreaction, we perform, for the first time, a numerical evolution starting directly from the regime of strong backreaction. Our analysis strongly suggests that, at least as long as one neglects spatial inhomogeneities in the inflaton field, the AS solution has no basin of attraction, not even a very small one that might have been missed in previous numerical studies. Our analysis employs an arsenal of analytical and numerical techniques, some established and some newly introduced, including (1) linear perturbation theory along the lines of arXiv:2209.08131, (2) the gradient expansion formalism (GEF) developed in arXiv:2109.01651, (3) a new linearized version of the GEF, and (4) the standard mode-by-mode approach in momentum space in combination with input from the GEF. All these methods yield consistent results confirming the instability of the AS solution, which renders the dynamics of axion inflation in the strong-backreaction regime even more interesting than previously believed.

   hep-phastro-ph.COhep-thJHEP(2023)·50 citations
7. 07*

   Composite scalar bosons masses: Effective potential versus Bethe-Salpeter approach

   A. Doff🇧🇷

   Ten years ago the $125$ GeV Higgs resonance was discovered at the LHC[1,2], if this boson is a fundamental particle or a particle composed of new strongly interacting particles is still an open question. If this is a composite boson there are still no signals of other possible composite states of this scheme, a possible solution to this problem was recently discussed in Refs.[30,31], where it is argued that the Higgs boson can be a composite dilaton [30]. In this work, considering an effective potential for composite operators we verify that the potential responsible for a light composite scalar boson of $O(120)GeV$, behaves like $\propto {\Phi }^4$ suggesting that if the Higgs boson is a composite scalar it may be a composite dilaton.

   hep-phPLB(2023)·0 citations
8. 08*

   Phenomenological study of two minor zeros in neutrino mass matrix using trimaximal mixing

   Iffat Ara Mazumder🇮🇳 · Rupak Dutta🇮🇳

   We study the phenomenological implications of two minor zeros in neutrino mass matrix using trimaximal mixing matrix. In this context, we analyse fifteen possible cases of two minor zeros in neutrino mass matrix and found only two cases, namely Class $A_1$ and Class $A_2$, that are compatible with the present neutrino oscillation data. We present correlations of several neutrino oscillation parameters and give prediction of the total neutrino mass, the values of effective Majorana mass, the effective electron anti-neutrino mass and CP violating Majorana phases for these two classes. We also explore the degree of fine tuning in the elements of neutrino mass matrix for the allowed classes. Moreover, we propose a flavor model within the seesaw model along with $Z_8$ symmetry group that can generate such classes.

   hep-phInt.J.Mod.Phys.A(2024)·2 citations
9. 09*

   Global monopoles in the two-Higgs-doublet-model

   Richard A. Battye🇬🇧 · Steven J. Cotterill🇬🇧 · Dominic G. Viatic🇬🇧

   We discuss monopoles formed due to the spontaneous breakdown of a global $SO(3{)}_{\mathrm{HF}}$ symmetry within the global two-Higgs doublet model. We explain that the Higgs sector dynamics can be described in terms of two vectors one of which is null, $R^A=(R^0,R^a,R^4,R^5)$ for $a=1,2,3$, with 5 independent components describing the Higgs family symmetry and another, $n^a$, with 3 independent components related to the ``would-be'' Goldstone bosons. When formed from random initial conditions we find that monopoles are formed with a charged vacuum in the centre which couples the two fields together. We find a spherical symmetric solution which is an approximately uniform, unit winding of the sphere in both the $R^a$ and $n^a$ vectors. These global monopoles are closely related to the Nambu monopole. The additional complexity and structure contained in these monopoles does not appear to prevent the scaling of their density.

   hep-phastro-ph.COhep-thPLB(2023)·6 citations
10. 10*

    Thermalization and isotropization in the AMY parton cascade ALPACA

    Robin Törnkvist🇸🇪 · Korinna Zapp🇸🇪

    We look at thermalization and isotropization processes in the newly introduced AMY QCD kinetic theory parton cascade ALPACA. For thermalization, we consider the case of overoccupied initial conditions, and study the time evolution of the distribution as it relaxes to thermal equilibrium. We find that the system thermalizes as expected compared to known analytical results. For anisotropic systems, we take a first look at the qualitative behaviour of isotropization for Color Glass Condensate-like initial conditions in a homogeneous box with periodic boundary conditions.

    hep-ph2 citations
11. 11*

    Small systems and the single-hit approximation in the AMY parton cascade ALPACA

    Robin Törnkvist🇸🇪 · Korinna Zapp🇸🇪

    Understanding how momentum anisotropies arise in small collision systems is important for a quantitative understanding of collectivity in terms of QCD dynamics in small and large collision systems. In this letter we present results for small collision systems from the newly developed parton cascade \textsc{Alpaca}, which faithfully encodes the AMY effective kinetic theory. \textsc{Alpaca} reproduces quantitatively previously know results from a calculation in the single-hit approximation for small values of the coupling. We discuss in detail how such a comparison is to be carried out. Particularly at larger coupling a generic differences between the two approaches becomes apparent, namely that in parton cascades particles interact over a finite distance while in direct integrations of the Boltzmann equation the interactions are local. This leads to quantitative differences in the extracted values for the elliptic flow coefficient. These discrepancies appear in situations where the mean free path is not large compared to the interaction time and the applicability of kinetic theory is thus questionable.

    hep-phnucl-thPLB(2024)·4 citations
12. 12*

    Old and new anomalies in charm

    Rigo Bause🇩🇪 · Hector Gisbert🇮🇹 · Gudrun Hiller🇩🇪 · Tim Höhne🇩🇪 · Daniel F. Litim🇬🇧 · Tom Steudtner🇩🇪

    The recent LHCb determination of the direct CP asymmetries in the decays $D^0\to K^{+}{K}^{-},{\pi }^{+}{\pi }^{-}$ hints at a sizeable breaking of two approximate symmetries of the SM: CP and U-spin. We aim at explaining the data with BSM physics and use the framework of flavorful $Z^{\prime }$ models. Interestingly, experimental and theoretical constraints very much narrow down the shape of viable models: Viable, anomaly-free models are electron- and muon-phobic and feature a light $Z^{\prime }$ of 10-20 GeV coupling only to right-handed fermions. The $Z^{\prime }$ can be searched for in low mass dijets or at the LHC as well as dark photon searches. A light $Z^{\prime }$ of $\sim$ 3 GeV or $\sim$ 5-7 GeV can moreover resolve the longstanding discrepancy in the $J/\psi ,{\psi }^{\prime }$ branching ratios with pion form factors from fits to $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}$ data, and simultaneously explain the charm CP asymmetries. Smoking gun signatures for this scenario are ${\rm Y}$ and charmonium decays into pions, taus or invisbles.

    hep-phhep-exPoS(2024)·2 citations
13. 13*

    The automation of SMEFT-Assisted Constraints on UV-Complete Models

    Jaco ter Hoeve🇳🇱 · Giacomo Magni🇳🇱 · Juan Rojo🇳🇱 · Alejo N. Rossia🇬🇧 · Eleni Vryonidou🇬🇧

    The ongoing Effective Field Theory (EFT) program at the LHC and elsewhere is motivated by streamlining the connection between experimental data and UV-complete scenarios of heavy new physics beyond the Standard Model (BSM). This connection is provided by matching relations mapping the Wilson coefficients of the EFT to the couplings and masses of UV-complete models. Building upon recent work on the automation of tree-level and one-loop matching in the SMEFT, we present a novel strategy automating the constraint-setting procedure on the parameter space of general heavy UV-models matched to dimension-six SMEFT operators. A new Mathematica package, match2fit, interfaces Matchmakereft, which derives the matching relations for a given UV model, and SMEFiT, which provides bounds on the Wilson coefficients by comparing with data. By means of this pipeline and using both tree-level and one-loop matching, we derive bounds on a wide range of single- and multi-particle extensions of the SM from a global dataset composed by LHC and LEP measurements. Whenever possible, we benchmark our results with existing studies. Our framework realises one of the main objectives of the EFT program in particle physics: deploying the SMEFT to bypass the need of directly comparing the predictions of heavy UV models with experimental data.

    hep-phJHEP(2024)·34 citations
14. 14*

    Dyonium Induced Fermion Number Violation

    Akio Sugamoto🇯🇵

    Dyonium induced fermion number violation is studied in a SU(2) x U(1) gauge theory with a doublet Higgs field. Dyonium is a generalization of Nambu's monopolium, having finite sized pair of dyon and anti-dyon, connected with a thin string under the linear plus Coulomb force. This is a follow-up of the author's paper on monopolium induced neutrino mass (including the lepton and baryon number violations), studied with a SO(10) Grand Unified model in 1983. To fulfill the requirement from the chiral anomaly or its index theorem, an electric field should be excited in parallel to the dipole magnetic field. This crucial dynamical problem, not fully answered then, has been solved, by considering not monopolium but dyonium. The fermionic zero modes in the dyonium background fields are necessary in evaluating the transition rate of the fermion number violation processes. Their Dirac equation can be reduced to a single component partial differential equation, similar to the renormalization group equation, which may be useful to estimate the reaction rates.

    hep-phhep-thNPB(2024)·0 citations
15. 15*

    Search for Decaying Dark Matter in the Virgo Cluster of Galaxies with HAWC

    A. Albert · R. Alfaro · J.C. Arteaga-Velázquez · H.A. Ayala Solares · R. Babu · E. Belmont-Moreno · K.S. Caballero-Mora · T. Capistrán · A. Carramiñana · S. Casanova · J. Cotzomi · S. Coutiño de León and 46 other authors

    The decay or annihilation of dark matter particles may produce a steady flux of very-high-energy gamma rays detectable above the diffuse background. Nearby clusters of galaxies provide excellent targets to search for the signatures of particle dark matter interactions. In particular, the Virgo cluster spans several degrees across the sky and can be efficiently probed with a wide field-of-view instrument. The High Altitude Water Cherenkov (HAWC) observatory, due to its wide field of view and sensitivity to gamma rays at an energy scale of 300 GeV--100 TeV is well-suited for this search. Using 2141 days of data, we search for gamma-ray emission from the Virgo cluster, assuming well-motivated dark matter sub-structure models. Our results provide some of the strongest constraints on the decay lifetime of dark matter for masses above 10 TeV.

    ↳ astro-ph.HEhep-phPRD(2024)·19 citations
16. 16*

    A 4D IIB Flux Vacuum and Supersymmetry Breaking. II. Bosonic Spectrum and Stability

    J. Mourad (APC, Univ. Paris Cité)🇫🇷 · A. Sagnotti (Scuola Normale Superiore and INFN, Pisa)🇮🇹

    We recently constructed type-IIB compactifications to four dimensions depending on a single additional coordinate, where a five-form flux $\Phi$ on an internal torus leads to a constant string coupling. Supersymmetry is fully broken when the internal manifold includes a finite interval of length $\ell$, which is spanned by a conformal coordinate in a finite range $0<z<z_m$. Here we examine the low-lying bosonic spectra and their classical stability, paying special attention to self-adjoint boundary conditions. Special boundary conditions result in the emergence of zero modes, which are determined exactly by first-order equations. The different sectors of the spectrum can be related to Schrödinger operators on a finite interval, characterized by pairs of real constants $\mu$ and $\tilde{\mu }$, with $\mu$ equal to $1/3$ or $2/3$ in all cases and different values of $\tilde{\mu }$. The potentials behave as $\frac{{\mu }^2-1/4}{z^2}$ and $\frac{{\tilde{\mu }}^2-1/4}{{\left(z_m-z\right)}^2}$ near the ends and can be closely approximated by exactly solvable trigonometric ones. With vanishing internal momenta, one can thus identify a wide range of boundary conditions granting perturbative stability, despite the intricacies that emerge in some sectors. For the Kaluza--Klein excitations of non-singlet vectors and scalars the Schrödinger systems couple pairs of fields, and the stability regions, which depend on the background, widen as the ratio $\Phi /{\ell }^4$ decreases.

    ↳ hep-thgr-qchep-phmath-ph+1JHEP(2023)·10 citations
17. 17*

    String-wall composites winding around a torus knot vacuum in an axionlike model

    Minoru Eto🇯🇵 · Takashi Hiramatsu🇯🇵 · Izumi Saito🇯🇵 · Yuki Sakakihara🇯🇵

    We study a simple axionlike model with a charged scalar $\varphi$ and a double-charged scalar $\zeta$ of global $U(1)$ symmetry. A particular feature of our model is that a vacuum manifold is a torus knot. We consider a hierarchical symmetry-breaking scenario where $\zeta$ first condenses, giving rise to cosmic $\zeta$-strings, and the subsequent condensation of $\varphi$ leads to domain-wall formation spanning the $\zeta$-strings. We find that the formation of the walls undergoes two different regimes depending on the magnitude of an explicit breaking term of the relative $U(1)$ between $\zeta$ and $\varphi$. One is the weakly interacting regime where the walls are accompanied by another cosmic $\varphi$ strings. The other is the strongly interacting regime where no additional strings appear. In both regimes, neither a $\zeta$-string, a $\varphi$-string nor a wall alone is topological, but the composite of an appropriate number of strings and walls as a whole is topologically stable, characterized by the fundamental homotopy group of the torus knot. We confirm the formation and the structure of the string-wall system by first-principle cosmological two-dimensional simulations. We find stable string-wall composites at equilibrium, where the repulsive force between $\zeta$-strings and the tension of walls balances, and a novel reconnection of the string-wall composites.

    ↳ hep-thastro-ph.COgr-qchep-phPRD(2023)·9 citations
18. 18*

    Duality-Invariant Non-linear Electrodynamics and Stress Tensor Flows

    Christian Ferko🇺🇸 · Sergei M. Kuzenko🇦🇺 · Liam Smith🇦🇺 · Gabriele Tartaglino-Mazzucchelli🇦🇺

    Given a model for self-dual non-linear electrodynamics in four spacetime dimensions, any deformation of this theory which is constructed from the duality-invariant energy-momentum tensor preserves duality invariance. In this work we present new proofs of this known result, and also establish a previously unknown converse: any parameterized family of duality-invariant Lagrangians, all constructed from an Abelian field strength $F_{\mu \nu }$ but not its derivatives, is related by a generalized stress tensor flow, in a sense which we make precise. We establish this and other properties of stress tensor deformations of theories of non-linear electrodynamics using both a conventional Lagrangian representation and using two auxiliary field formulations. We analyze these flows in several examples of duality-invariant models including the Born-Infeld and ModMax theories, and we derive a new auxiliary field representation for the two-parameter family of ModMax-Born-Infeld theories. These results suggest that the space of duality-invariant theories may be characterized as a subspace of theories of electrodynamics with the property that all tangent vectors to this subspace are operators constructed from the stress tensor.

    ↳ hep-thhep-phmath-phmath.MP+2PRD(2023)·55 citations
19. 19*

    A high-precision result for a full-color three-loop three-point form factor in $\mathcal{N}=4$ SYM

    Xin Guan🇨🇳 · Guanda Lin🇨🇳 · Xiao Liu🇬🇧 · Yan-Qing Ma🇨🇳 · Gang Yang🇨🇳

    We perform a high-precision computation of the three-loop three-point form factor of the stress-tensor supermultiplet in $\mathcal{N}=4$ SYM. Both the leading-color and non-leading-color form factors are expanded in terms of simple integrals. We compute the complete set of integrals at a special kinematic point with very high precision using $\mathtt{AMFlow}$. The high-precision leading-color result enables us to obtain the analytic form of a numerical constant in the three-loop BDS ansatz, which is previously known only numerically. The high-precision values of the non-leading-color finite remainder as well as all integrals are also presented, which can be valuable for future use.

    ↳ hep-thhep-phJHEP(2024)·12 citations
20. 20*

    Bayesian and frequentist investigation of prior effects in EFTofLSS analyses of full-shape BOSS and eBOSS data

    Emil Brinch Holm🇩🇰 · Laura Herold🇩🇪 · Théo Simon🇫🇷 · Elisa G. M. Ferreira🇯🇵 · Steen Hannestad🇩🇰 · Vivian Poulin🇫🇷 · Thomas Tram🇩🇰

    Previous studies based on Bayesian methods have shown that the constraints on cosmological parameters from the Baryonic Oscillation Spectroscopic Survey (BOSS) full-shape data using the Effective Field Theory of Large Scale Structure (EFTofLSS) depend on the choice of prior on the EFT nuisance parameters. In this work, we explore this prior dependence by adopting a frequentist approach based on the profile likelihood method, which is inherently independent of priors, considering data from BOSS, eBOSS and Planck. We find that the priors on the EFT parameters in the Bayesian inference are informative and that prior volume effects are important. This is reflected in shifts of the posterior mean compared to the maximum likelihood estimate by up to 1.0 {\sigma} (1.6 {\sigma}) and in a widening of intervals informed from frequentist compared to Bayesian intervals by factors of up to 1.9 (1.6) for BOSS (eBOSS) in the baseline configuration, while the constraints from Planck are unchanged. Our frequentist confidence intervals give no indication of a tension between BOSS/eBOSS and Planck. However, we find that the profile likelihood prefers extreme values of the EFT parameters, highlighting the importance of combining Bayesian and frequentist approaches for a fully nuanced cosmological inference. We show that the improved statistical power of future data will reconcile the constraints from frequentist and Bayesian inference using the EFTofLSS.

    ↳ astro-ph.COhep-phPRD(2023)·72 citations
21. 21*

    Two-point sum-rules in three-dimensional Yang-Mills theory

    Simon Caron-Huot🇨🇦 · Andrzej Pokraka🇺🇸 · Zahra Zahraee🇨🇦

    We compute the stress-tensor two-point function in three-dimensional Yang-Mills theory to three-loops in perturbation theory. Using its calculable shape at high momenta, we test the notion that its Borel transform is saturated at low energies by the lowest glueball state(s). This assumption provides relatively stable estimates for the mass of the lightest glueball that we compare with lattice simulations. We also provide estimates for the coupling of the lightest glueball to the stress tensor. Along the way, we comment on the extent that such estimates are non-rigorous. Lastly, we discuss the possibility of applying the sum-rule analysis to two-point functions of higher-spin operators and obtain a crude approximation for the glueball couplings to these operators.

    ↳ hep-thhep-lathep-phJHEP(2024)·7 citations
22. 22*

    Unveiling Dark Matter free-streaming at the smallest scales with high redshift Lyman-alpha forest

    Vid Iršič🇬🇧 · Matteo Viel🇮🇹 · Martin G. Haehnelt🇬🇧 · James S. Bolton🇬🇧 · Margherita Molaro🇬🇧 · Ewald Puchwein🇩🇪 · Elisa Boera🇮🇹 · George D. Becker🇺🇸 · Prakash Gaikwad🇩🇪 · Laura C. Keating🇬🇧 · Girish Kulkarni🇮🇳

    This study introduces novel constraints on the free-streaming of thermal relic warm dark matter (WDM) from Lyman-$\alpha$ forest flux power spectra. Our analysis utilises a high-resolution, high-redshift sample of quasar spectra observed using the HIRES and UVES spectrographs ($z=4.2-5.0$). We employ a Bayesian inference framework and a simulation-based likelihood that encompasses various parameters including the free-streaming of dark matter, cosmological parameters, the thermal history of the intergalactic medium, and inhomogeneous reionization, to establish lower limits on the mass of a thermal relic WDM particle of $5.7\mathrm{keV}$ (at 95\% C.L.). This result surpasses previous limits from the Lyman-$\alpha$ forest through reduction of the measured uncertainties due to a larger statistical sample and by measuring clustering to smaller scales ($k_{\max }=0.2\mathrm{k}{\mathrm{m}}^{-1}\mathrm{s}$). The approximately two-fold improvement due to the expanded statistical sample suggests that the effectiveness of Lyman-$\alpha$ forest constraints on WDM models at high redshifts are limited by the availability of high-quality quasar spectra. Restricting the analysis to comparable scales and thermal history priors as in prior studies ($k_{\max }<0.1\mathrm{k}{\mathrm{m}}^{-1}\mathrm{s}$) lowers the bound on the WDM mass to $4.1\mathrm{keV}$. As the precision of the measurements increases, it becomes crucial to examine the instrumental and modelling systematics. On the modelling front, we argue that the impact of the thermal history uncertainty on the WDM particle mass constraint has diminished due to improved independent observations. At the smallest scales, the primary source of modeling systematic arises from the structure in the peculiar velocity of the intergalactic medium and inhomogeneous reionization.

    ↳ astro-ph.COhep-phhep-thPRD(2024)·126 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.