Wed·Feb 12, 2020Wednesday·February 12, 2020

1. 01*

   Multicomponent superfluidity in two-color QCD at finite density at next-to-leading order

   Prabal Adhikari🇺🇸 · Huy Nguyen🇺🇸

   In this paper, we study two-color, two-flavor QCD using chiral perturbation theory at next-to-leading order when the diquark chemical potential (${\mu }_B$) is equal to the isospin chemical potential (${\mu }_I$). For chemical potentials larger than the physical pion mass, the system is in a multicomponent superfluid phase with both pions and diquarks. We construct the one-loop effective potential using $\chi$PT in the presence of an external multicomponent superfluid source and use the effective potential to calculate the chiral condensate, the multicomponent superfluid condensate and the (multicomponent) superfluid density. We also find the critical chemical potential and the order of the phase transition from the normal phase to the multicomponent condensed phase at next-to-leading order. The phase transition remains second order (as at tree-level) and the critical chemical potential is equal to the one-loop renormalized diquark (or pion) mass.

   hep-phhep-thEur.Phys.J.Plus(2020)·3 citations
2. 02*

   Quarkonium Production in Heavy Ion Collisions: From Open Quantum System to Transport Equation

   Xiaojun Yao🇺🇸 · Weiyao Ke🇺🇸 · Yingru Xu🇺🇸 · Steffen A. Bass🇺🇸 · Thomas Mehen🇺🇸 · Berndt Müller🇺🇸

   Using the open quantum system formalism and effective field theory of QCD, we derive the Boltzmann transport equation of quarkonium inside the quark-gluon plasma. Our derivation illuminates that the success of transport equations in quarkonium phenomenology is closely related to the separation of scales in the problem.

   hep-phnucl-thNPA(2021)·11 citations
3. 03*

   Flavor-changing decay $h\to \tau \mu$ at super hadron colliders

   M. A. Arroyo-Ureña🇲🇽 · T. A. Valencia-Pérez🇲🇽 · R. Gaitán🇲🇽 · J. H. Montes de Oca Y.🇲🇽 · A. Fernández-Téllez🇲🇽

   We study the flavor-changing decay $h\to \tau \mu$ with $\tau ={\tau }^{-}+{\tau }^{+}$ and $\mu ={\mu }^{-}+{\mu }^{+}$ of a Higgs boson at future hadron colliders, namely: a) High Luminosity Large Hadron Collider, b) High Energy Large Hadron Collider and c) Future hadron-hadron Circular Collider. The theoretical framework adopted is the Two-Higgs-Doublet Model type III. The free model parameters involved in the calculation are constrained through Higgs boson data, Lepton Flavor Violating processes and the muon anomalous magnetic dipole moment; later they are used to analyze the branching ratio of the decay $h\to \tau \mu$ and to evaluate the $gg\to h$ production cross section. We find that at the Large Hadron Collider is not possible to claim for evidence of the decay $h\to \tau \mu$ achieving a signal significance about of $1.46\sigma$ by considering its final integrated luminosity, 300 fb${}^{-1}$. More promising results arise at the High Luminosity Large Hadron Collider in which a prediction of 4.6$\sigma$ when an integrated luminosity of 3 ab${}^{-1}$ and $\tan \beta =8$ are achieved. Meanwhile, at the High Energy Large Hadron Collider (Future hadron-hadron Circular Collider) a potential discovery could be claimed with a signal significance around $5.04\sigma$ ($5.43\sigma$) for an integrated luminosity of 3 ab${}^{-1}$ and $\tan \beta =8$ (5 ab${}^{-1}$ and $\tan \beta =4$).

   hep-phJHEP(2020)·11 citations
4. 04*

   Evolution of parton showers and parton distribution functions

   Zoltán Nagy🇩🇪 · Davison E. Soper🇺🇸

   Initial state evolution in parton shower event generators involves parton distribution functions. We examine the probability for the system to evolve from a higher scale to a lower scale without an initial state splitting. A simple argument suggests that this probability, when multiplied by the ratio of the parton distributions at the two scales, should be independent of the parton distribution functions. We call this the PDF property. We examine whether the PDF property actually holds using Pythia and Deductor. We also test a related property for the Deductor shower and discuss the physics behind the results.

   hep-phPRD(2020)·19 citations
5. 05*

   A Complete Solution to the Strong CP Problem: a SUSY Extension of the Nelson-Barr Model

   Jason Evans🇨🇳 · Chengcheng Han🇨🇳 · Tsutomu T. Yanagida🇨🇳 · Norimi Yokozaki🇯🇵

   We present a supersymmetric solution to the strong CP problem based on spontaneous CP violation which simultaneously addresses the affects coming from supersymmetry breaking. The generated CP violating phase is communicated to the quark sector by interacting with a heavy quark a la Nelson-Barr. The Majorana mass of the right handed neutrinos is generated by interactions with the CP violating sector and so does not conserve CP. This gives the neutrino sector a non-trivial CP violating phase which can then generate the baryon asymmetry of the universe through leptogeneis. The problematic phase in the supersymmetry breaking parameters are suppressed by appealing to a particular gauge mediation model which naturally suppresses the phases of the tree-level gluino mass. This suppression plus the fact that in gauge mediation all loop generated flavor and CP violation is of the minimal flavor violation variety allows for a complete and consistent solution to the strong CP problem.

   hep-phPRD(2021)·23 citations
6. 06*

   Nucleon and $\Delta$ resonances in $\gamma p\to K^{+}{\Sigma }^0(1385)$ photoproduction

   Ai-Chao Wang🇨🇳 · Wen-Ling Wang🇨🇳 · Fei Huang🇨🇳

   The photoproduction of $\gamma p\to K^{+}{\Sigma }^0(1385)$ is investigated based on an effective Lagrangian approach using the tree-level Born approximation, with the purpose of understanding the reaction mechanisms and resonance contents and their associated parameters in this reaction. In addition to the $t$-channel $K$ and $K^{\ast }(892)$ exchanges, $s$-channel nucleon ($N$) exchange, $u$-channel $\Lambda$ exchange, and generalized contact term, the exchanges of a minimum number of $N$ and $\Delta$ resonances in the $s$ channel are taken into account in constructing the reaction amplitudes to describe the experimental data. It is found that the most recent differential cross-section data from the CLAS Collaboration can be well reproduced by including one of the $N(1895){1/2}^{-}$, $\Delta (1900){1/2}^{-}$, and $\Delta (1930){5/2}^{-}$ resonances. The reaction mechanisms of $\gamma p\to K^{+}{\Sigma }^0(1385)$ are discussed in detail, and the predictions of the beam and target asymmetries for this reaction are given. The cross sections of $\gamma p\to K^0{\Sigma }^{+}(1385)$ are shown to be able to further constrain the theoretical models and pin down the resonance contents for $\gamma p\to K^{+}{\Sigma }^0(1385)$.

   hep-phnucl-thPRD(2020)·15 citations
7. 07*

   Pentaquark components in low-lying baryon resonances

   Kai Xu🇹🇭 · Attaphon Kaewsnod🇹🇭 · Zheng Zhao🇹🇭 · Xuyang Liu🇹🇭 · Sorakrai Srisuphaphon🇹🇭 · Ayut Limphirat🇹🇭 · Yupeng Yan🇹🇭

   We study pentaquark states of both light $q^4\bar{q}$ and hidden heavy $q^{3}Q\bar{Q}$ (q = u,d,s quark in SU(3) flavor symmetry; Q = c, b quark) systems with a general group theory approach in the constituent quark model, and the spectrum of light baryon resonances in the ansatz that the $l=1$ baryon states may consist of the $q^3$ as well as $q^4\bar{q}$ pentaquark component. The model is fitted to ground state baryons and light baryon resonances which are believed to be normal three-quark states. The work reveals that the $N(1535)1/2^{-}$ and $N(1520)3/2^{-}$ may consist of a large $q^4\bar{q}$ component while the $N(1895)1/2^{-}$ and $N(1875)3/2^{-}$ are respectively their partners, and the $N^{+}(1685)$ might be a $q^4\bar{q}$ state. By the way, a new set of color-spin-flavor-spatial wave function for $q^{3}Q\bar{Q}$ systems in the compact pentaquark picture are constructed systematically for studying hidden charm pentaquark states.

   hep-phPRD(2020)·17 citations
8. 08*

   Fully open-flavor tetraquark states $bc\bar{q}\bar{s}$ and $sc\bar{q}\bar{b}$ with $J^P=0^{+},1^{+}$

   Qi-Nan Wang🇨🇳 · Wei Chen🇨🇳

   We have studied the masses for fully open-flavor tetraquark states $bc\bar{q}\bar{s}$ and $sc\bar{q}\bar{b}$ with quantum numbers $J^P=0^{+},1^{+}$. We systematically construct all diquark-antiquark interpolating currents and calculate the two-point correlation functions and spectral densities in the framework of QCD sum rule method. Our calculations show that the masses are about $7.1-7.2$ GeV for the $bc\bar{q}\bar{s}$ tetraquark states and $7.0-7.1$ GeV for the $sc\bar{q}\bar{b}$ tetraquarks. The masses of $bc\bar{q}\bar{s}$ tetraquarks are below the thresholds of ${\bar{B}}_{s}D$ and ${\bar{B}}_s^{\ast }D$ final states for the scalar and axial-vector channels respectively. The $sc\bar{q}\bar{b}$ tetraquark states with $J^P=1^{+}$ lie below the $B_c^{+}{K}^{\ast }$ and $B_s^{\ast }D$ thresholds. Such low masses for these possible tetraquark states indicate that they can only decay via weak interaction and thus are very narrow and stable.

   hep-phhep-exhep-latEPJC(2020)·20 citations
9. 09*

   Higgs boson decay $h\to Z\gamma$ and muon magnetic dipole moment in the $\mu \nu$SSM

   Chang-Xin Liu🇨🇳 · Hai-Bin Zhang🇨🇳 · Jin-Lei Yang🇨🇳 · Shu-Min Zhao🇨🇳 · Yu-Bin Liu🇨🇳 · Tai-Fu Feng🇨🇳

   To solve the $\mu$ problem and generate three tiny neutrino masses in the MSSM, the $\mu$ from $\nu$ Supersymmetric Standard Model ($\mu \nu$SSM) introduces three singlet right-handed neutrino superfields, which lead to the mixing of the Higgs doublets with the sneutrinos. The mixing affects the lightest Higgs boson mass and the Higgs couplings. The present observed 95\% CL upper limit on signal strength of the 125 GeV Higgs boson decay $h\to Z\gamma$ is 6.6, which still is plenty of space to prove the existence of new physics. In this work, we investigate the signal strength of the 125 GeV Higgs boson decay channel $h\to Z\gamma$ in the $\mu \nu$SSM. Besides, we consider the two-loop electroweak corrections of muon anomalous magnetic dipole moment (MDM) in the model, which also make important contributions compared with one-loop electroweak corrections.

   hep-phJHEP(2020)·27 citations
10. 10*

    CP Violating Phase Originated from Right-handed Neutrino Mixing

    Xiao-Yan Wang🇨🇳 · Xiang-Jun Chen🇨🇳

    We propose an idea that the observed CP violation in neutrino oscillation is originated from the phase in right-handed neutrino mixing by seesaw mechanism. We add small breaking terms $M_{ij}{N}_{R_i}{N}_{R_j}$ in model based on $A_4$ symmetry to generate non-diagonal right-handed neutrino mixing, which will give a small correction to TBM mixing via seesaw mechanism with nonzero reactor angle and CP violating phase. We estimate the CP violating phase by investigating the process of leptogenesis due to the decay of right-handed neutrino.

    hep-phPhys.Atom.Nucl.(2020)·1 citation
11. 11*

    The $\pi \eta$ interaction and $a_0$ resonances in photon-photon scattering

    Junxu Lu🇫🇷 · B. Moussallam🇫🇷

    We revisit the information on the two lightest $a_0$ resonances and $S$-wave $\pi \eta$ scattering that can be extracted from photon-photon scattering experiments. For this purpose we construct a model for the $S$-wave photon-photon amplitudes which satisfies analyticity properties, two-channel unitarity and obeys the soft photon as well as the soft pion constraints. The underlying I=1 hadronic $T$-matrix involves six phenomenological parameters and is able to account for two resonances below 1.5 GeV.We perform a combined fit of the $\gamma \gamma \to \pi \eta$ and $\gamma \gamma \to K_S{K}_S$ high statistics experimental data from the Belle collaboration. Minimisation of the ${\chi }^2$ is found to have two distinct solutions with approximately equal ${\chi }^2$. One of these exhibits a light and narrow excited $a_0$ resonance analogous to the one found in the Belle analysis. This however requires a peculiar coincidence between the $J=0$ and $J=2$ resonance effects which is likely to be unphysical. In both solutions the $a_0(980)$ resonance appears as a pole on the second Riemann sheet. The location of this pole in the physical solution is determined to be $m-i\Gamma /2=1000.7_{-0.7}^{+12.9}-i36.6_{-2.6}^{+12.7}$ MeV. The solutions are also compared to experimental data in the kinematical region of the decay $\eta \to {\pi }^0\gamma \gamma$. In this region an isospin violating contribution associated with ${\pi }^{+}{\pi }^{-}$ rescattering must be added for which we provide a dispersive evaluation.

    hep-phEPJC(2020)·47 citations
12. 12*

    Searching for a Light (pseudo)Scalar via the Yukawa Process at the ILC

    Eung Jin Chun🇰🇷 · Tanmoy Mondal🇰🇷

    Yukawa production of a light scalar can be explored at a linear collider. Light (pseudo)scalar can exist in extended Higgs models and an interesting example is the light pseudoscalar in Type-X two Higgs doublet model. The model can explain the anomalous magnetic moment of muon at large $\tan \beta$. We show that the available parameter space in this model can be examined by the Yukawa process at 5$\sigma$ at the ILC.

    hep-phhep-ex0 citations
13. 13*

    A family of double-beauty tetraquarks: Axial-vector state $T_{bb;\bar{u}\bar{s}}^{-}$

    S. S. Agaev🇦🇿 · K. Azizi🇮🇷 · B. Barsbay🇹🇷 · H. Sundu🇹🇷

    The spectroscopic parameters and decay channels of the axial-vector tetraquark $T_{bb;\overline{u}\overline{s}}^{-}$ (in what follows, $T_{b:\overline{s}}^{\mathrm{AV}}$) are explored using the quantum chromodynamics (QCD) sum rule method. The mass and coupling of this state are calculated using two-point sum rules by taking into account various vacuum condensates, up to 10 dimensions. Our prediction for the mass of this state $m=(10215\pm 250)\mathrm{MeV}$ confirms that it is stable with respect to strong and electromagnetic decays and can dissociate to conventional mesons only via weak transformations. We investigate the dominant semileptonic $T_{b:\overline{s}}^{\mathrm{AV}}\to {\mathcal{Z}}_{b:\overline{s}}^{0}l{\overline{\nu }}_l$ and nonleptonic $T_{b:\overline{s}}^{\mathrm{AV}}\to {\mathcal{Z}}_{b:\overline{s}}^{0}M$ decays of $T_{b:\overline{s}}^{\mathrm{AV}}$. In these processes, ${\mathcal{Z}}_{b:\overline{s}}^0$ is a scalar tetraquark $[bc][\overline{u}\overline{s}]$ built of a color-triplet diquark and an antidiquark, whereas $M$ is one of the vector mesons ${\rho }^{-}$, $K^{\ast }(892)$, $D^{\ast }(2010{)}^{-}$, and $D_s^{\ast -}$. To calculate the partial widths of these decays, we use the QCD three-point sum rule approach and evaluate the weak transition form factors $G_i$ $(i=0,1,2,3)$, which govern these processes. The full width ${\Gamma }_{\mathrm{full}}=(12.9\pm 2.1)\times 10^{-8}\mathrm{MeV}$ and the mean lifetime $\tau =5.1_{-0.71}^{+0.99}\mathrm{fs}$ of the tetraquark $T_{b:\overline{s}}^{\mathrm{AV}}$ are computed using the aforementioned weak decays. The obtained information about the parameters of $T_{b:\overline{s}}^{\mathrm{AV}}$ and ${\mathcal{Z}}_{b:\overline{s}}^0$ is useful for experimental investigations of these double-heavy exotic mesons.

    hep-phhep-exhep-latCPC(2021)·24 citations
14. 14*

    Soft diffraction within the QCD color dipole picture

    G. M. Peccini🇧🇷 · F. Kopp🇧🇷 · M. V. T. Machado🇧🇷 · D. A. Fagundes🇧🇷

    In this work we consider the QCD parton saturation models to describe soft interactions at the high energy limit. The total and elastic cross sections as well as the elastic slope parameter are obtained for proton-proton and pion-proton collisions and compared to recent experimental results. The analyses are done within the color dipole formalism taking into account saturation models which have been tested against DIS data. The main point is that the match between soft and hard interaction occurs in the saturation region which can be described by high density QCD approaches. Discussion is performed on the main theoretical uncertainties associated with calculations.

    hep-phPRD(2020)·8 citations
15. 15*

    New Sensitivity Curves for Gravitational-Wave Signals from Cosmological Phase Transitions

    Kai Schmitz🇨🇭

    Gravitational waves (GWs) from strong first-order phase transitions (SFOPTs) in the early Universe are a prime target for upcoming GW experiments. In this paper, I construct novel peak-integrated sensitivity curves (PISCs) for these experiments, which faithfully represent their projected sensitivities to the GW signal from a cosmological SFOPT by explicitly taking into account the expected shape of the signal. Designed to be a handy tool for phenomenologists and model builders, PISCs allow for a quick and systematic comparison of theoretical predictions with experimental sensitivities, as I illustrate by a large range of examples. PISCs also offer several advantages over the conventional power-law-integrated sensitivity curves (PLISCs); in particular, they directly encode information on the expected signal-to-noise ratio for the GW signal from a SFOPT. I provide semianalytical fit functions for the exact numerical PISCs of LISA, DECIGO, and BBO. In an appendix, I moreover present a detailed review of the strain noise power spectra of a large number of GW experiments. The numerical results for all PISCs, PLISCs, and strain noise power spectra presented in this paper can be downloaded from the Zenodo online repository [https://doi.org/10.5281/zenodo.3689582]. In a companion paper [1909.11356], the concept of PISCs is used to perform an in-depth study of the GW signal from the cosmological phase transition in the real-scalar-singlet extension of the standard model. The PISCs presented in this paper will need to be updated whenever new theoretical results on the expected shape of the signal become available. The PISC approach is therefore suited to be used as a bookkeeping tool to keep track of the theoretical progress in the field.

    hep-phastro-ph.COgr-qcJHEP(2021)·447 citations
16. 16*

    Collider signatures of dark CP-violation

    A. Cordero-Cid🇲🇽 · J. Hernandez-Sanchez🇲🇽 · V. Keus🇫🇮 · S. Moretti🇬🇧 · D. Rojas-Ciofalo🇬🇧 · D. Sokolowska🇧🇷

    We study an extension of the Standard Model (SM) in which two copies of the SM-Higgs doublet which do not acquire a vacuum expectation value, and hence are {\it inert}, are added to the scalar sector. The lightest particle from the inert sector, which is protected from decaying to SM particles through the conservation of a $Z_2$ symmetry, is a viable dark matter candidate. We allow for CP-violation in this extended dark sector and evaluate the $ZZZ$ vertex and its CP-violating form factor in several benchmark scenarios. We provide collider signatures of this dark CP-violation in the form of potentially observable asymmetries and cross sections for the $f\bar{f}\to Z^{\ast }\to ZZ$ process at both leptonic and hadronic machines.

    hep-phPRD(2020)·26 citations
17. 17*

    Cusp and collinear anomalous dimensions in four-loop QCD from form factors

    Andreas von Manteuffel🇺🇸 · Erik Panzer🇬🇧 · Robert M. Schabinger🇺🇸

    We calculate the complete quark and gluon cusp anomalous dimensions in four-loop massless QCD analytically from first principles. In addition, we determine the complete matter dependence of the quark and gluon collinear anomalous dimensions. Our approach is to Laurent expand four-loop quark and gluon form factors in the parameter of dimensional regularization. We employ finite field and syzygy techniques to reduce the relevant Feynman integrals to a basis of finite integrals, and subsequently evaluate the basis integrals directly from their standard parametric representations.

    hep-phhep-thPRL(2020)·220 citations
18. 18*

    Quark Flavor Phenomenology of the QCD Axion

    Jorge Martin Camalich🇪🇸 · Maxim Pospelov🇺🇸 · Pham Ngoc Hoa Vuong🇫🇷 · Robert Ziegler🇨🇭 · Jure Zupan🇺🇸

    Axion models with generation-dependent Peccei-Quinn charges can lead to flavor-changing neutral currents, thus motivating QCD axion searches at precision flavor experiments. We rigorously derive limits on the most general effective flavor-violating couplings from current measurements and assess their discovery potential. For two-body decays we use available experimental data to derive limits on $q\to q^{\prime }a$ decay rates for all flavor transitions. Axion contributions to neutral-meson mixing are calculated in a systematic way using chiral perturbation theory and operator product expansion. We also discuss in detail baryonic decays and three-body meson decays, which can lead to the best search strategies for some of the couplings. For instance, a strong limit on the $\Lambda \to na$ transition can be derived from the supernova SN 1987A. In the near future, dedicated searches for $q\to q^{\prime }a$ decays at ongoing experiments could potentially test Peccei-Quinn breaking scales up to $10^{12}$ GeV at NA62 or KOTO, and up to $10^9$ GeV at Belle II or BES III.

    hep-phhep-exPRD(2020)·239 citations
19. 19*

    Hadronization correspondence of Hawking-Unruh radiation from rotating and electrically charged black holes

    Hayam Yassin🇪🇬 · Eman R. Abo Elyazeed🇪🇬 · Raghda E. Break🇪🇬 · Amira M. Megahed (Ain Shams U., Cairo)🇪🇬 · Abdel Nasser Tawfik (Nile U., ECTP)

    The proposed correspondence between the Hawking-Unruh radiation mechanism in rotating, electrically-charged and electrically-charged-rotating black holes and the hadronization in high-energy physics is assumed. This allows us to determine the well-profound freezeout parameters of the heavy-ion collisions. Furthermore, black holes thermodynamics is found analogical to that of the high-energy collisions. We also introduce a relation expressing the dependence of the angular momentum and the angular velocity deduced from rotating black holes on the chemical potential. The novel phase diagram for rotating, electrically-charged and electrically-charged-rotating black holes are found in an excellent agreement with the phase diagrams drawn for electrically-charged black holes and also with the ones mapped out from the statistical thermal models and the high-energy experiments. Moreover, our estimations for the freezeout conditions $⟨E⟩/⟨N⟩$ and $s/T^3$ are in excellent good agreement with the ones determined from the hadronization process, especially at $\mu \le 0.3$ GeV.

    hep-phPhys.Scripta(2020)·3 citations
20. 20*

    Black hole superradiant instability from ultralight spin-2 fields

    Richard Brito🇮🇹 · Sara Grillo🇮🇹 · Paolo Pani🇮🇹

    Ultralight bosonic fields are compelling dark-matter candidates and arise in a variety of beyond-Standard-Model scenarios. These fields can tap energy and angular momentum from spinning black holes through superradiant instabilities, during which a macroscopic bosonic condensate develops around the black hole. Striking features of this phenomenon include gaps in the spin-mass distribution of astrophysical black holes and a continuous gravitational-wave~(GW) signal emitted by the condensate. So far these processes have been studied in great detail for scalar fields and, more recently, for vector fields. Here we take an important step forward in the black-hole superradiance program by computing, analytically, the instability time scale, the direct GW emission, and the stochastic background, in the case of massive tensor (i.e., spin-$2$) fields. Our analysis is valid for any black hole spin and for small boson masses. The instability of massive spin-$2$ fields shares some properties with the scalar and vector cases, but its phenomenology is much richer, for example there exist multiple modes with comparable instability time scales, and the dominant GW signal is hexadecapolar rather than quadrupolar. Electromagnetic and GW observations of spinning black holes in the mass range $M\in (1,10^{10})M_{\odot }$ can constrain the mass of a putative spin-$2$ field in the range $10^{-22}\lesssim m_b{\mathrm{c}}^2/eV\lesssim 10^{-10}$. For $10^{-17}\lesssim m_b{\mathrm{c}}^2/eV\lesssim 10^{-15}$, the space mission LISA could detect the continuous GW signal for sources at redshift $z=20$, or even larger.

    ↳ gr-qcastro-ph.HEhep-phhep-thPRL(2020)·125 citations
21. 21*

    Threshold expansion formula of $N$-boson in finite volume from variational approach

    Peng Guo🇺🇸

    In present work, we show how the threshold expansion formula of $N$ identical bosons in finite volume may be derived by iterations of Faddeev-type coupled dynamical equations. The energy shift of $N$-boson system near threshold is dominated by zero momenta mode of $N$-body amplitudes with all particles nearly static. The dominant zero momenta mode and sub-leading non-zero momenta mode contributions are connected through finite volume Faddeev-type coupled dynamical equations. Eliminating non-zero momenta modes by iterations ultimately yields an analytic expression that can be solved by threshold expansion.

    ↳ hep-latcond-mat.quant-gashep-phPRD(2020)·22 citations
22. 22*

    Astrophysical Tests of Screened Modified Gravity

    Jeremy Sakstein🇺🇸

    Screened modified gravity theories evade the solar system tests that have proved prohibitive for classical alternative gravity theories. In many cases, they do not fit into the PPN formalism. The environmental dependence of the screening has motivated a concerted effort to find new and novel probes of gravity using objects that are well-studied but have hitherto not been used to test gravity. Astrophysical objects---stars, galaxies, clusters---have proved competitive tools for this purpose since they occupy the partially-screened regime between solar system and the Hubble flow. In this article we review the current astrophysical tests of screened modified gravity theories.

    ↳ astro-ph.COgr-qchep-phhep-thInt.J.Mod.Phys.D(2018)·61 citations
23. 23*

    Nonlocal Correlation of Spin in High Energy Physics

    Chen Qian🇨🇳 · Jun-Li Li🇨🇳 · Abdul Sattar Khan🇨🇳 · Cong-Feng Qiao🇨🇳

    Nonlocality is a key feature of quantum theory and is reflected in the violation of Bell inequalities for entangled systems. The experimental tests beyond the electromagnetism and massless quanta are of great importance for understanding the nonlocality in different quantum interactions. In this work, we develop a generalized Clauser-Horne inequality pertaining especially to the high energy physics processes, which is quantum mechanical intervene free. We find, in the process of pseudoscalar quarkonium exclusive decay to entangled $\Lambda \bar{\Lambda }$ pairs, the inequality could be violated and is verifiable in high energy experiments, like BES III or BELLE II.

    ↳ quant-phhep-phPRD(2020)·29 citations
24. 24*

    Quantum expression for the electrical conductivity of massless quark matter and of the hadron resonance gas in the presence of a magnetic field

    Jayanta Dey🇮🇳 · Subhasis Samanta🇵🇱 · Sabyasachi Ghosh🇮🇳 · Sarthak Satapathy🇮🇳

    We have studied the classical and quantum expressions of electrical conductivity and their numerical estimation in the presence of a magnetic field for hadron resonance gas (HRG) and massless quark matter. Classical results of transport coefficients of HRG matter in the presence of a magnetic field were studied previously by Dash et al. [Phys. Rev. D 102, 016016 (2020)] using the standard relaxation time approximation in the Boltzmann equation. In the same reference, the transition from isotropic transport coefficients to anisotropic coefficients in the presence of a magnetic field was also estimated for massless and HRG matter. This led to an upper limit or Stefan-Boltzmann (SB) type limit to the nonperturbative domain transition of transport coefficients. In a similar context, the present work has concentrated on the classical to quantum transition of HRG transport from the domain of high temperature and low magnetic field to that of low temperature and high magnetic field. We have also compared the quantum modification of HRG results with that of massless quark matter, where we observed an opposite trend. A similar kind of quantum effect is also noticed between mesons and baryons due to their different particle distribution functions. Despite the fact that HRG contains both mesons and baryons, Landau quantization of its net magnetothermodynamic phase space reveals meson- or boson-dominated quantum modification. That is why the quantum modification of HRG results reveals the opposite trend from that of massless quark matter, which faces fermionic quantum modification.

    ↳ nucl-thhep-phhep-thPRC(2022)·31 citations
25. 25*

    Dynamics of millicharged dark matter in supernova remnants

    Jung-Tsung Li🇺🇸 · Tongyan Lin🇺🇸

    Dark matter could have a small electromagnetic charge, provided the charge-to-mass ratio is much less than that of electrons or protons. This candidate, commonly known as millicharged dark matter (mDM), would form a plasma and interact with the interstellar medium and electromagnetic fields within galaxies. In general, understanding the dynamics of mDM requires consideration of collective plasma effects. It has been proposed that mDM can be accelerated in supernova remnants, forming a dark cosmic ray population that would leave distinct experimental signatures. In this work, we study a microphysical model where mDM is shocked by a supernova remnant and isotropized in the frame of the expanding fluid. We find that for $|q_{\chi }/m_{\chi }|\gtrsim 10^{-13}e/\mathrm{MeV}$, the isotropization length for electromagnetic plasma instabilities is much shorter than the size of the supernova remnant. This is a necessary, though not sufficient, first step for formation of a Fermi-accelerated mDM component, and determining the size of this component requires further study. We discuss additional implications of mDM interactions in supernova remnants.

    ↳ astro-ph.COastro-ph.HEhep-phPRD(2020)·32 citations
26. 26*

    Toward the observation of interference effects in nonlinear Compton scattering

    Anton Ilderton🇬🇧 · Ben King🇬🇧 · Suo Tang🇬🇧

    The photon spectrum from electrons scattering on multiple laser pulses exhibits interference effects not present for scattering on a single pulse. We investigate the conditions required for the experimental observation of these interference effects in electron-laser collisions, in particular analysing the roles of the detector resolution and the transverse divergence of the pump electron beam.

    ↳ physics.atom-phhep-phPLB(2020)·24 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.