Wed·Apr 28, 2021Wednesday·April 28, 2021

1. 01*

   A Beyond Mean Field Approach to Yang-Mills Thermodynamics

   Pracheta Singha🇮🇳 · Rajarshi Ray🇮🇳 · Chowdhury Aminul Islam🇨🇳 · Munshi G Mustafa🇮🇳

   We propose a beyond mean field approach to evaluate Yang-Mills thermodynamics from the partition function with n-body gluon contribution, in the presence of a uniform background Polyakov field. Using a path integral based formalism, we obtain, unlike the previous mean field studies within this model framework, physically consistent results with good agreement to the lattice data throughout the temperature range.

   hep-phnucl-thSpringer Proc.Phys.(2022)·1 citation
2. 02*

   Bubble Wall Velocity at Strong Coupling

   Francesco Bigazzi🇮🇹 · Alessio Caddeo🇮🇹 · Tommaso Canneti🇮🇹 · Aldo L. Cotrone🇮🇹

   Using the holographic correspondence as a tool, we determine the steady-state velocity of expanding vacuum bubbles nucleated within chiral finite temperature first-order phase transitions occurring in strongly-coupled large $N$ QCD-like models. We provide general formulae for the friction force exerted by the plasma on the bubbles and for the steady-state velocity. In the top-down holographic description, the phase transitions are related to changes in the embedding of $Dq$-$\bar{D}q$ flavor branes probing the black hole background sourced by a stack of $N$ $Dp$-branes. We first consider the Witten-Sakai-Sugimoto $D4$-$D8$-$\bar{D}8$ setup, compute the friction force and deduce the equilibrium velocity. Then we extend our analysis to more general setups and to different dimensions. Finally, we briefly compare our results, obtained within a fully non-perturbative framework, to other estimates of the bubble velocity in the literature.

   hep-phastro-ph.COhep-thJHEP(2021)·82 citations
3. 03*

   Unitarisation dependence of diffractive scattering in light of high-energy collider data

   Arno Vanthieghem🇺🇸 · Atri Bhattacharya🇧🇪 · Rami Oueslati🇧🇪 · Jean-René Cudell🇧🇪

   We study the consequences of high-energy collider data on the best fits to total, elastic, inelastic, and single-diffractive cross sections for $pp$ and $p\bar{p}$ scattering using different unitarisation schemes. We find that the data are well fitted both by eikonal and U-matrix schemes, but that diffractive data prefer the U-matrix. Both schemes may be generalised by means of an additional parameter; however, this yields only marginal improvements to the fits. We provide estimates for $\rho$, the ratio of the real part to the imaginary part of the elastic amplitude, for the different fits. We comment on the effect of the different schemes on present and future cosmic ray data.

   hep-phJHEP(2021)·8 citations
4. 04*

   Determination of the Gluonic D-term and Mechanical Radii of Proton from Experimental data

   Wei Kou🇨🇳 · Rong Wang🇨🇳 · Xurong Chen🇨🇳

   We apply a "color" tripole ansatz for describing the $D$-term of the proton. By fitting the experimental data of the vector meson J/$\psi$ and $\varphi$ photoproductions near the thresholds, we firstly obtained the gluonic $D$-term of the proton. $D_g(0)$ is estimated to be $-2.16\pm 0.42$ for J/$\psi$ and $-1.31\pm 0.48$ for $\varphi$, and the mechanical root mean square radius of proton is estimated to be $0.61\pm 0.29$ fm for $\varphi$ and $0.42\pm 0.11$ fm for J/$\psi$.

   hep-ph12 citations
5. 05*

   Impact of texture zeros on dark matter and neutrinoless double beta decay in inverse seesaw

   Nayana Gautam🇮🇳 · Mrinal Kumar Das🇮🇳

   We study the impact of maximal zeros of the Dirac mass matrix on neutrino phenomenology and dark matter within the framework of an inverse seesaw ISS $(2,3)$. ISS $(2,3)$ is obtained by adding two right handed neutrinos and three gauge singlets sterile fermions to the standard model leading to an extra sterile state in the keV range. The model is more predictive because of the presence of fewer numbers of right handed neutrinos than the conventional inverse seesaw. Moreover, texture zeros in the structures of the mass matrices involved in the model can reduce the free parameters. We extensively study the effect of different textures of Dirac mass matrix on sterile neutrino dark matter phenomenology. Our study also includes the implications of these texture zero mass matrices on low energy phenomena like neutrinoless double beta decay (0$\nu \beta \beta$). The zero textures highly constrain the parameter space of the model. Based on the allowed cosmological ranges of the relic abundance, decay rates, and dark matter mixing with the active neutrinos, we study the viability of the different textures within the framework.

   hep-phNPB(2021)·3 citations
6. 06*

   Magnetic dipole moments of the $Z_c(4020{)}^{+}$, $Z_c(4200{)}^{+}$, $Z_{cs}(4000{)}^{+}$ and $Z_{cs}(4220{)}^{+}$ states in light-cone QCD

   U. Ozdem🇹🇷 · A. Karadeniz Yildirim🇹🇷

   The magnetic dipole moments of the $Z_c(4020{)}^{+}$, $Z_c(4200{)}^{+}$, $Z_{cs}(4000{)}^{+}$ and $Z_{cs}(4220{)}^{+}$ states are extracted in the framework of the light-cone QCD sum rules. In the calculations, we use the hadronic molecular form of interpolating currents, and photon distribution amplitudes to get the magnetic dipole moment of $Z_c(4020{)}^{+}$, $Z_c(4200{)}^{+}$, $Z_{cs}(4000{)}^{+}$ and $Z_{cs}(4220{)}^{+}$ tetraquark states. The magnetic dipole moments are obtained as ${\mu }_{Z_c}=0.66_{-0.25}^{+0.27}$, ${\mu }_{Z_c^1}=1.03_{-0.29}^{+0.32}$, ${\mu }_{Z_{cs}}=0.73_{-0.26}^{+0.28}$, ${\mu }_{Z_{cs}^1}=0.77_{-0.25}^{+0.27}$ for the $Z_c(4020{)}^{+}$, $Z_c(4200{)}^{+}$, $Z_{cs}(4000{)}^{+}$ and $Z_{cs}(4220{)}^{+}$ states, respectively. We observe that the results obtained for the $Z_c(4020{)}^{+}$, $Z_c(4200{)}^{+}$, $Z_{cs}(4000{)}^{+}$ and $Z_{cs}(4220{)}^{+}$ states are large enough to be measured experimentally. As a by product, we predict the magnetic dipole moments of the neutral $Z_{cs}(4000)$ and $Z_{cs}(4220)$ states. The results presented here can serve to be helpful knowledge in experimental as well as theoretical studies of the properties of hidden-charm tetraquark states with and without strangeness.

   hep-phhep-exhep-latPRD(2021)·23 citations
7. 07*

   Analyses of scalar potential and lepton flavor violating decays in a model with $A_4$ symmetry

   Raghavendra Srikanth Hundi🇮🇳 · Itishree Sethi🇮🇳

   We have considered a model, originally proposed by Ma and Wegman, where the mixing pattern in neutrino sector is explained with three Higgs doublets, six Higgs triplets and $A_4$ symmetry. The mixing pattern is explained with the help of vacuum expectation values (VEVs) of the above mentioned doublets and triplets. In order to study about the VEVs of the scalar fields, we construct the full invariant scalar potential of this model. After minimizing this scalar potential, we have found that two Higgs triplets can acquire zero VEVs. In order to generate non-zero VEVs to all the six Higgs triplets, we have added two more Higgs doublets to the model. Thereafter we have demonstrated that the current neutrino oscillation data can be consistently explained in our model. To study some phenomenological implications of this model, we have worked out on the branching ratios for lepton flavor violating decays.

   hep-phNPB(2022)·0 citations
8. 08*

   Unitarity constraints on meson electroproduction at backward angles

   J.M. Laget🇺🇸

   At large virtuality $Q^2$, the coupling to the $\rho$ meson production channels provides us with a natural explanation of the surprisingly large cross section of the $\omega$, as well as the ${\pi }^{+}$, meson electroproduction recently measured at backward angles, without destroying the good agreement between the Regge pole model and the data at the real photon point. Together with elastic re-scattering of the outgoing meson it also provides us with a way to explain why the node, that appears at $u\sim -0.15$ GeV${}^2$ at the real photon point, disappears at moderate virtuality $Q^2$. Predictions are given for the electroproduction of the ${\pi }^0$ meson.

   hep-phPRC(2021)·9 citations
9. 09*

   Master Integrals for Inclusive Weak Decays of Heavy Flavours at Next-to-Leading Order

   Th. Mannel🇩🇪 · D. Moreno🇩🇪 · A. A. Pivovarov🇩🇪

   We present analytical results for master integrals emerging in the computation of differential rates for inclusive weak decays of heavy flavors at next-to-leading order (NLO) in QCD. As an immediate physical application, these master integrals allow for a calculation of the spectra of the leptonic invariant mass in inclusive semileptonic decays in the framework of the heavy quark expansion, including the NLO QCD corrections to power suppressed terms.

   hep-phPRD(2021)·6 citations
10. 10*

    Charmonium decays into ${\Lambda }_c{\bar{\Lambda }}_c$ pair governed by the hadronic loop mechanism

    Ri-Qing Qian🇨🇳 · Jun-Zhang Wang🇨🇳 · Xiang Liu🇨🇳 · Takayuki Matsuki🇯🇵

    In this work, we investigate the open-charm decay process $\psi \to {\Lambda }_c{\bar{\Lambda }}_c$ via the hadronic loop mechanism for vector charmonia above ${\Lambda }_c{\bar{\Lambda }}_c$ threshold. The branching ratios of these vector charmonium states to ${\Lambda }_c{\bar{\Lambda }}_c$ are estimated. The charmonium explanation of the $Y(4630)$ observed in $e^{+}{e}^{-}\to {\Lambda }_c{\bar{\Lambda }}_c$ is tested. Furthermore, for the predicted higher vector charmonia above 4.7 GeV, the branching ratios $\mathcal{B}[\psi (nS)\to {\Lambda }_c{\bar{\Lambda }}_c]$ with $n=7,8,9$ are found to be of the order of magnitude of $10^{-4}-10^{-3}$ while $\mathcal{B}[\psi (mD)\to {\Lambda }_c{\bar{\Lambda }}_c]$ with $m=6,7,8$ are of the order of magnitude of $10^{-3}-10^{-2}$. The experimental signals of these missing charmonium states are discussed. The search for them may be an interesting topic in the future BESIII and Belle II experiments.

    hep-phhep-exPRD(2021)·7 citations
11. 11*

    Renormalization and Mixing of Staple-Shaped Wilson Line Operators on the Lattice Revisited

    Yao Ji🇩🇪 · Jian-Hui Zhang🇨🇳 · Shuai Zhao🇺🇸 · Ruilin Zhu🇨🇳

    Transverse-momentum-dependent parton distribution functions and wave functions (TMDPDFs/TMDWFs) can be extracted from lattice calculations of appropriate Euclidean matrix elements of staple-shaped Wilson line operators. We investigate the mixing pattern of such operators under lattice renormalization using symmetry considerations. We perform an analysis for operators with all Dirac structures, which reveals mixings that are not present in one-loop lattice perturbation theory calculations. We also present the relevant one-loop matching in a renormalization scheme that does not introduce extra non-perturbative effects at large distances, both for the TMDPDFs and for the TMDWFs. Our results have the potential to greatly facilitate numerical calculations of TMDPDFs and TMDWFs on the lattice.

    hep-phhep-latnucl-exnucl-thPRD(2021)·27 citations
12. 12*

    Resurrecting Low-Mass Axion Dark Matter Via a Dynamical QCD Scale

    Lucien Heurtier🇬🇧 · Fei Huang🇨🇳 · Tim M. P. Tait🇺🇸

    In the framework where the strong coupling is dynamical, the QCD sector may confine at a much higher temperature than it would in the Standard Model, and the temperature-dependent mass of the QCD axion evolves in a non-trivial way. We find that, depending on the evolution of ${\Lambda }_{\mathrm{QCD}}$, the axion field may undergo multiple distinct phases of damping and oscillation leading generically to a suppression of its relic abundance. Such a suppression could therefore open up a wide range of parameter space, resurrecting in particular axion dark-matter models with a large Peccei-Quinn scale $f_a\gg 10^{12}\mathrm{GeV}$, i.e., with a lighter mass than the standard QCD axion.

    hep-phJHEP(2021)·23 citations
13. 13*

    Elastic photon-initiated production at the LHC: the role of hadron-hadron interactions

    L.A. Harland-Lang🇬🇧 · V.A. Khoze🇬🇧 · M.G. Ryskin🇷🇺

    We analyse in detail the role of additional hadron-hadron interactions in elastic photon-initiated (PI) production at the LHC, both in $pp$ and heavy ion collisions. We first demonstrate that the source of difference between our predictions and other results in the literature for PI muon pair production is dominantly due to an unphysical cut that is imposed in these latter results on the dimuon-hadron impact parameter. We in addition show that this is experimentally disfavoured by the shape of the muon kinematic distributions measured by ATLAS in ultraperipheral PbPb collisions. We then consider the theoretical uncertainty due to the survival probability for no additional hadron-hadron interactions, and in particular the role this may play in the tendency for the predicted cross sections to lie somewhat above ATLAS data on PI muon pair production, in both $pp$ and PbPb collisions. This difference is relatively mild, at the $\sim 10\%$ level, and hence a very good control over the theory is clearly required. We show that this uncertainty is very small, and it is only by taking very extreme and rather unphysical variations in the modelling of the survival factor that this tension can be removed. This underlines the basic, rather model independent, point that a significant fraction of elastic PI scattering occurs for hadron-hadron impact parameters that are simply outside the range of QCD interactions, and hence this sets a lower bound on the survival factor in any physically reasonable approach. Finally, other possible origins for this discrepancy are discussed.

    hep-phhep-exnucl-thSciPost Phys.(2021)·40 citations
14. 14*

    Vector resonances spin alignement as a probe of spin hydrodynamics and freeze-out

    Kayman J. Gonçalves🇧🇷 · Giorgio Torrieri🇧🇷

    We argue that a detailed analysis of the spin alignement of vector mesons can serve as a probe of two little-understood aspects of spin dynamics in the vortical fluid: The degree of relaxation between vorticity and parton spin polarization, and the degree of coherence of the hadron wavefunction at freeze-out. We illustrate these with a coalescence model.

    ↳ nucl-thhep-phPRC(2022)·31 citations
15. 15*

    Dynamical exploring the QCD matter at finite temperatures and densities-a short review

    Shanjin Wu🇨🇳 · Chun Shen🇺🇸 · Huichao Song🇨🇳

    We provide a concise review on recent theory advancements towards full-fledged (3+1)D dynamical descriptions of relativistic nuclear collisions at finite baryon density. Heavy-ion collisions at different collision energies produce strongly-coupled matter and probe the QCD phase transition at the crossover, critical point, and first-order phase transition regions. Dynamical frameworks provide a quantitative tool to extract properties of hot QCD matter and map fireballs to the QCD phase diagram. Outstanding challenges are highlighted when confronting current theoretical frameworks with current and forthcoming experimental measurements from the RHIC beam energy scan programs.

    ↳ nucl-thhep-phnucl-exChin.Phys.Lett.(2021)·36 citations
16. 16*

    Soliton Oscillations and Revised Constraints from Eridanus II of Fuzzy Dark Matter

    Barry T. Chiang (1, main)🇬🇧 · Hsi-Yu Schive (2)🇹🇼 · Tzihong Chiueh (2) ((1) University of Cambridge, (2) National Taiwan University)🇹🇼

    Fuzzy dark matter (FDM) has been a promising alternative to standard cold dark matter. The model consists of ultralight bosons with mass $m_b\sim 10^{-22}$ eV and features a quantum-pressure-supported solitonic core that oscillates. In this work, we show that the soliton density oscillations persist even after significant tidal stripping of the outer halo. We report two intrinsic yet distinct timescales associated, respectively, with the ground-state soliton wavefunction ${\tau }_{00}$ and the soliton density oscillations ${\tau }_{\text{soliton}}$, obeying ${\tau }_{\text{soliton}}/{\tau }_{00}\simeq 2.3$. The central star cluster (SC) in Eridanus II has a characteristic timescale ${\tau }_{\text{soliton}}/{\tau }_{\text{SC}}\sim 2$ to $3$ that deviates substantially from unity. As a result, we demonstrate, both analytically and numerically with three-dimensional self-consistent FDM simulations, that the gravitational heating of the SC owing to soliton density oscillations is negligible irrespective of $m_b$. We also show that the subhalo mass function to form Eridanus II does not place a strong constraint on $m_b$. These results are contrary to the previous findings by Marsh & Niemeyer (2019).

    ↳ astro-ph.COastro-ph.GAhep-phPRD(2021)·50 citations
17. 17*

    Hyperbolic compactification of M-theory and de Sitter quantum gravity

    G. Bruno De Luca🇺🇸 · Eva Silverstein🇺🇸 · Gonzalo Torroba🇦🇷

    We present a mechanism for accelerated expansion of the universe in the generic case of negative-curvature compactifications of M-theory, with minimal ingredients. M-theory on a hyperbolic manifold with small closed geodesics supporting Casimir energy -- along with a single classical source (7-form flux) -- contains an immediate 3-term structure for volume stabilization at positive potential energy. Hyperbolic manifolds are well-studied mathematically, with an important rigidity property at fixed volume. They and their Dehn fillings to more general Einstein spaces exhibit explicit discrete parameters that yield small closed geodesics supporting Casimir energy. The off-shell effective potential derived by M. Douglas incorporates the warped product structure via the constraints of general relativity, screening negative energy. Analyzing the fields sourced by the localized Casimir energy and the available discrete choices of manifolds and fluxes, we find a regime where the net curvature, Casimir energy, and flux compete at large radius and stabilize the volume. Further metric and form field deformations are highly constrained by hyperbolic rigidity and warping effects, leading to calculations giving strong indications of a positive Hessian, and residual tadpoles are small. We test this via explicit back reacted solutions and perturbations in patches including the Dehn filling regions, initiate a neural network study of further aspects of the internal fields, and derive a Maldacena-Nunez style no-go theorem for Anti-de Sitter extrema. A simple generalization incorporating 4-form flux produces axion monodromy inflation. As a relatively simple de Sitter uplift of the large-N M2-brane theory, the construction applies to de Sitter holography as well as to cosmological modeling, and introduces new connections between mathematics and the physics of string/M theory compactifications.

    ↳ hep-thastro-ph.COhep-phSciPost Phys.(2022)·60 citations
18. 18*

    Generation of an electromagnetic field nonminimally coupled to gravity during Higgs inflation

    O.O. Sobol🇨🇭 · E.V. Gorbar🇺🇦 · O.M. Teslyk🇺🇦 · S.I. Vilchinskii🇨🇭

    In the framework of Higgs inflation, we consider the electromagnetic field nonminimally coupled to gravity via the parity-preserving $\propto R{F}^2$ and parity-violating $\propto RF\tilde{F}$ terms. Using the perturbation theory to the leading order in these couplings, we study the generation of the electromagnetic field during the inflation stage. We derive the effective kinetic and axial coupling functions arising in the Einstein frame in the usual metric as well as Palatini formulations of gravity. For both formulations, we determine the power spectrum, energy density, and helicality of the generated electromagnetic fields for different values of the nonminimal coupling constants. Finally, we estimate the maximal present-day magnitude of the magnetic field as $10^{-14}-10^{-15}$G with the correlation length of order 10 pc.

    ↳ gr-qchep-phPRD(2021)·11 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.