Tue·Feb 5, 2019Tuesday·February 5, 2019

1. 01*

   Enhancements and suppressions of CP violating effect in the nucleons, nuclei, and atoms

   Nodoka Yamanaka🇫🇷

   The electric dipole moment (EDM) is a very sensitive probe of CP violation beyond the standard model, and it as been measured in many systems such as atoms, neutrons, etc. The EDM of composite systems may be sensitive to several elementary level CP violating processes, but the theoretical evaluations of the CP violation at different physical (atomic, nuclear, hadronic, elementary) hierarchies are required to unveil them. In this context, we are particularly interested in which CP violating processes are enhanced in a given system, or vice versa. In this proceedings contribution, we will give an overview of the enhancement and suppression of CP violation in processes contributing to the EDMs of composite systems.

   hep-phhep-exnucl-thphysics.atom-phPoS(2019)·2 citations
2. 02*

   Extracting jet transport parameter $\hat{q}$ from a multiphase transport model

   Feng-Chu Zhou🇨🇳 · Guo-Liang Ma🇨🇳 · Yu-Gang Ma🇨🇳

   Within a multi-phase transport model with string melting scenario, jet transport parameter $\hat{q}$ is calculated in Au+Au collisions at $\sqrt{s_{NN}}$= 200 GeV and Pb+Pb collisions at $\sqrt{s_{NN}}$= 2.76 TeV. The $\hat{q}$ increases with the increasing of jet energy for both partonic phase and hadronic phase. The energy and path length dependences of $\hat{q}$ in full heavy-ion evolution are consistent with the expectations of jet quenching. The correlation between jet transport parameter $\hat{q}$ and dijet transverse momentum asymmetry $A_J$ is mainly investigated, which discloses that a larger $\hat{q}$ corresponds to a larger $A_J$. It supports a consistent jet energy loss picture from the two viewpoints of single jet and dijet. It is proposed to measure dijet asymmetry distributions with different jet transport parameter ranges as a new potential method to study jet quenching physics in high energy heavy-ion collisions.

   hep-phnucl-exnucl-thEPJA(2020)·7 citations
3. 03*

   Radiative decays and the $\mathbf{SU}(6)$ Lie Algebra

   Milton Dean Slaughter🇺🇸

   We present research on radiative decays of vector ($J^{PC}=1^{--}$) to pseudoscalar ($J^{PC}=0^{-+}$) particles ($u$, $d$, $s$, $c$, $b$, $t$ quark system) using broken symmetry techniques in the infinite momentum frame and equal time commutation relations and the $SU(6)$ Lie algebra and conducted without ascribing any specific form to meson quark structure or intra-quark interactions. We utilize the physical electromagnetic current $j_{em}^{\mu }(0)$ including its singlet $U(1)$ term and focus on the $SU(6)$ $35$-plet. We derive new relations involving the electromagnetic current (including its singlet--proportional to the $SU(6)$ singlet). Remarkably, we find that the electromagnetic current singlet plays an intrinsic role in understanding the physics of radiative decays and that the charged and neutral $\rho$ meson radiative decays into $\pi \gamma$ are due entirely to the singlet term in $j_{em}^{\mu }(0)$. Although there is insufficient radiative decay experimental data available at this time, parametrization of possible predicted values of $\Gamma ({D^{\ast }}^0\to D^0\gamma )$ is made. For conciseness and self-containment, we compute all $SU(6)$ Lie algebra simple roots, positive roots, weights and fundamental weights which allow the construction of all $SU(6)$ representations. We also derive all non-zero $SU(6)$ generator commutators and anti-commutators---useful for further research on grand unified theories.

   hep-phInt.J.Mod.Phys.A(2019)·0 citations
4. 04*

   Propagation of QCD Color through Strongly Interacting Systems

   William K Brooks🇨🇱 · Jorge López🇨🇱

   The propagation of QCD color through atomic nuclei is studied via a new analysis using a geometric model of semi-inclusive deep inelastic scattering. The experimental data were previously published by the HERMES Collaboration and consisted of the multiplicity ratio observable (2007) and the transverse momentum broadening observable (2010). We perform a simultaneous fit of these two observables to estimate (1) the color lifetime of the quark, (2) quark energy loss, (3) the $\hat{q}$ transport coefficient, and (4) the cross section for hadronic interaction with the medium. We present preliminary results for this fit.

   hep-phhep-exnucl-exnucl-thJPS Conf.Proc.(2019)·0 citations
5. 05*

   Confronting $B$ anomalies with low energy parity violation

   G. D'Ambrosio🇮🇹 · A. M. Iyer🇮🇹 · F. Piccinini🇮🇹 · A.D. Polosa🇮🇹

   Indirect searches have the potential to probe scales beyond the realm of direct searches. In this letter we consider the implications of two parity violating experiments: weak charge of proton $Q_W^p$ and the Caesium atom $Q_W^{Cs}$ on the solutions to lepton flavour non-universality violations (LFUV) in the decay of $B$ mesons. Working in a generic implementation of a minimal $Z^{\prime }$ model, we assume the primary contribution being due to the electron to facilitate comparison with the low $q^2$ parity violating experiments. We demonstrate that the conclusion is characterized by different limiting behavior depending on the chirality of the lepton current. The correlation developed in this study demonstrates the effectiveness in studying the synergy between different experiments leading to a deeper understanding of the interpretation of the existing data. It is shown that a possible future improvement in the parity violating experiments can have far reaching implications in the context of direct searches. We also comment on the prospect of addition of the muon to the fits and the role it plays in ameliorating the constraints on models of $Z^{\prime }$. This offers a complimentary understanding of the pattern of the coupling of the NP to the leptons, strongly suggesting either a muon only or a combination of solutions to the anomalies.

   hep-phPRD(2020)·9 citations
6. 06*

   How a spinning quark moves in the NJL type mean field

   Feng Li🇩🇪

   The transport equation of the spinning quarks, moving in the Nambu-Jona-Lasinio (NJL) type mean field, is derived by solving the Schwinger-Dyson equations, up to the order of $\hslash$, under the mean field approximation. It shows that the scalar and the vector mean field potentials have different impacts on the quantum correction to the transport equation. Both the forces give rise to an anomalous velocity and an anomalous force where the latter would vanish if the vector force is turned off. The particle dispersion relation is modified by the vector force as well. Besides, the spin precession in the particle rest frame is purely governed by the vector force.

   hep-phnucl-th1 citation
7. 07*

   All Fermion Masses and Mixings in an Intersecting D-brane World

   Van E. Mayes🇺🇸

   It is shown that neutrino mixing angles which are consistent with current experimental observations may be naturally obtained in a Pati-Salam model constructed from intersecting D6 branes on a $T^6/(Z_2\times Z_2)$ orientifold. The Dirac mass matrices in the model are naturally the same as those which are obtained by imposing a $\mathbf{\Delta }(27)$ flavor symmetry, which allows for near-tribimaximal mixing in the neutrino sector. In addition, it is possible to obtain the correct mass matrices for quarks and charged leptons, as well as nearly the correct CKM matrix. An RGE analysis of the neutrino mass parameters, including the seesaw mechanism assuming a specific form for the right-handed neutrino mass matrix is performed, and it is found that the neutrino mixing angles at the electroweak scale are ${\theta }_{12}=35.0^{\circ }$, ${\theta }_{23}=47.1^{\circ }$, and ${\theta }_{13}=8.27^{\circ }$. In addition,the neutrino mass-squared differences are found to be $\Delta m_{32}^2=0.00252$ eV${}^2$ and $\Delta m_{21}^2=0.0000739$ eV${}^2$ with $m_1=0.0146$ eV, $m_2=0.0170$ eV, and $m_3=0.0530$ eV.

   hep-phNPB(2020)·4 citations
8. 08*

   A variant two-Higgs doublet model with a new Abelian gauge symmetry

   Chuan-Ren Chen🇹🇼 · Cheng-Wei Chiang🇹🇼 · Kuo-Yen Lin🇹🇼

   We consider a two-Higgs doublet model extended with a broken Abelian gauge symmetry under which all Standard Model (SM) quarks, fourth generation fermions and a new SM-singlet scalar boson are charged. Such a setup is shown to be able to accommodate the muon anomalous magnetic dipole moment while being consistent with existing constraints of flavor-violating decays of charged leptons and Z boson. The new scalar boson offers a suitable dark matter candidate that interacts with the SM particles via the Higgs portal and the $Z^{\prime }$ boson associated with the new gauge symmetry. The dark matter direct detection bound is found to impose a strong constraint on the new gauge coupling.

   hep-phPLB(2019)·2 citations
9. 09*

   QCD Sum Rules Analysis of Weak Decays of Doubly-Heavy Baryons

   Yu-Ji Shi🇨🇳 · Wei Wang🇨🇳 · Zhen-Xing Zhao🇨🇳

   We calculate the weak decay form factors of doubly-heavy baryons using three-point QCD sum rules. The Cutkosky rules are used to derive the double dispersion relations. We include perturbative contributions and condensation contributions up to dimension five, and point out that the perturbative contributions and condensates with lowest dimensions dominate. An estimate of part of gluon-gluon condensates show that it plays a less important role. With these form factors at hand, we present a phenomenological study of semileptonic decays. The future experimental facilities can test these predictions, and deepen our understanding of the dynamics in decays of doubly-heavy baryons.

   hep-phhep-exEPJC(2020)·83 citations
10. 10*

    Chiral Symmetry Breaking by Monopole Condensation

    Aiichi Iwazaki🇯🇵

    Under the assumption of Abelian dominance in QCD, we show that either color charge or chirality of quark is not conserved, when the low energy massless quark collides with QCD monopole. Because the color charge is conserved in reality, the chirality is not conserved. We show by using chiral anomaly that chiral non symmetric quark pair production takes place when a classical color charge is putted in a vacuum with monopole condensation, while chiral symmetric pair production takes place in a vacuum with no monopole condensation. Our results indicate that the chiral symmetry is broken by the monopole condensation.

    hep-phJPS Conf.Proc.(2019)·0 citations
11. 11*

    Fermion Dark Matter with Scalar Triplet at Direct and Collider Searches

    Basabendu Barman🇮🇳 · Subhaditya Bhattacharya🇮🇳 · Purusottam Ghosh🇮🇳 · Saurabh Kadam🇮🇳 · Narendra Sahu🇮🇳

    Fermion dark matter (DM) as an admixture of additional singlet and doublet vector like fermions provides an attractive and allowed framework by relic density and direct search constraints within TeV scale, although limited by its discovery potential at the Large Hadron Collider (LHC). An extension of the model with scalar triplet can yield neutrino masses and provide some cushion to the direct search constraint of the DM through pseudo-Dirac mass splitting. This in turn, allow the model to live in a larger region of the parameter space and open the door for detection at LHC, even if slightly. The model however can see an early discovery at International Linear Collider (ILC) without too much of fine-tuning. The complementarity of LHC, ILC and direct search prospect of this framework is studied in this paper.

    hep-phPRD(2019)·28 citations
12. 12*

    The electromagnetic form factors of $\Lambda$ hyperon in the vector meson dominance model

    Yongliang Yang🇨🇳 · Dian-Yong Chen🇨🇳 · Zhun Lu🇨🇳

    We perform an analysis on the electromagnetic form factors of the $\Lambda$ hyperon in the time-like reaction $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }$ by using a modified vector meson dominance model. We consider both the intrinsic structure components and the meson clouds components. For the latter one, we not only include the contributions from the $\varphi$ and $\omega$ mesons, but also take into account the contributions from the resonance states $\omega (1420)$, $\omega (1650)$, $\varphi (1680)$ and $\varphi (2170)$. We extract the model parameters by combined fit to the time-like effective form factor $|G_{\mathrm{eff}}|$, the electromagnetic form factor ratio $|G_E/G_M|$ and the relative phase $\Delta \Phi$ of the $\Lambda$ hyperon from the BaBar and BESIII Collaborations. We find that the vector meson dominance model can simultaneously describe these observables. Particularly, the inclusion of the resonance states in the model is necessary for explaining the ratio $|G_E/G_M|$ in a wide range of $\sqrt{s}$ as well as the large phase angle. With the fitted parameters, we predict the single and double polarization observables, which could be measured in polarized annihilation reactions. Moreover, we analytically continue the expression of the form factors to space-like region and estimate the space-like form factors of $\Lambda$ hyperon.

    hep-phPRD(2019)·55 citations
13. 13*

    Analysis of fine-tuning measures in models with extended Higgs sectors

    Daniël Boer🇳🇱 · Ruud Peeters🇳🇱 · Sybrand Zeinstra🇩🇪

    In the literature measures of fine-tuning have been discussed as one of the tools to assess the feasibility of beyond the Standard Model theories. In this paper we focus on two specific measures and investigate what kind of fine-tuning they actually quantify. First we apply both measures to the two Higgs doublet model, for which one can analyze the numerical results in terms of available analytic expressions. After drawing various conclusions about the fine-tuning measures, we investigate a particular left-right symmetric model for which it has been claimed that already at tree-level it suffers from a high amount of fine-tuning. We will reach a different conclusion, although left-right symmetric models may require a modest amount of fine-tuning if phenomenological constraints are imposed. Our analysis shows that the two considered measures can probe different aspects of fine-tuning and are both useful if applied and interpreted in the appropriate way.

    hep-phNPB(2019)·5 citations
14. 14*

    Radiative and pionic transitions $Z_c(4020{)}^0\to X(3872)\gamma$ and $Z_c(4020{)}^{\pm }\to X(3872){\pi }^{\pm }$

    M.B. Voloshin🇺🇸

    The radiative transitions from the neutral exotic $Z_c(4020{)}^0$ resonance to $X(3872)$ with emission of a photon and the pionic transitions from the charged $Z_c(4020{)}^{\pm }$ to $X(3872)$ and a charged pion ${\pi }^{\pm }$ are considered for both charmoniumlike states being charmed meson-antimeson molecules. The underlying processes for these transitions are the decays of the charmed vector meson to pseudoscalar plus a photon or a pion. It is found that the discussed transition rates typically amount to a branching fraction of several permil with a peak at the vector meson pair threshold.

    hep-phPRD(2019)·14 citations
15. 15*

    Mesons in a soft-wall AdS-Schwarzschild approach at low temperature

    Thomas Gutsche🇩🇪 · Valery E. Lyubovitskij🇩🇪 · Ivan Schmidt🇨🇱 · Andrey Yu. Trifonov🇷🇺

    We derive a holographic soft-wall approach in five dimensional AdS-Schwarzschild space for the description of mesons at finite temperature. In this first application we consider the small temperature limit and derive analytical expression for the mass spectrum of mesons with adjustable quantum numbers $n$ (radial number), $L$ (angular orbital momentum) and $J$ (total angular momentum). We explicitly separate the contribution at zero temperature and the leading order temperature correction. The temperature corrections arise from the temperature dependence of the dilaton parameter (which is the parameter of spontaneous breaking of chiral symmetry related to the pseudoscalar meson decay constant) and the warping of the AdS metric due to temperature. We extend our results to any hadron with integer spin (tetraquarks, dibaryons, etc.). We present numerical analysis for the temperature dependence of meson masses and form factors.

    hep-phPRD(2019)·35 citations
16. 16*

    QED and Fundamental Symmetries in Positronium Decays

    Steven D. Bass🇵🇱

    We discuss positronium decays with emphasis on tests of fundamental symmetries and the constraints from measurements of other precision observables involving electrons and photons.

    hep-phnucl-exnucl-thActa Phys.Polon.B(2019)·56 citations
17. 17*

    Mass dimension one fermions and their gravitational interaction

    R. J. Bueno Rogerio🇧🇷 · R. de C. Lima🇧🇷 · L. Duarte🇧🇷 · J. M. Hoff da Silva🇧🇷 · M. Dias🇧🇷 · C. R. Senise Jr🇧🇷

    We investigate in detail the interaction between the spin-$1/2$ fields endowed with mass dimension one and the graviton. We obtain an interaction vertex that combines the characteristics of scalar-graviton and Dirac's fermion-graviton vertices, due to the scalar-dynamic attribute and the fermionic structure of this field. It is shown that the vertex obtained obeys the Ward-Takahashi identity, ensuring the gauge invariance for this interaction. In the contribution of the mass dimension one fermion to the graviton propagator at one-loop, we found the conditions for the cancellation of the tadpole term by a cosmological counter-term. We calculate the scattering process for arbitrary momentum. For low energies, the result reveals that only the scalar sector present in the vertex contributes to the gravitational potential. Finally, we evaluate the non relativistic limit of the gravitational interaction and obtain an attractive Newtonian potential, as required for a dark matter candidate.

    hep-phEPL(2019)·11 citations
18. 18*

    Probing ALPs and the Axiverse with Superconducting Radiofrequency Cavities

    Zachary Bogorad🇺🇸 · Anson Hook🇺🇸 · Yonatan Kahn🇺🇸 · Yotam Soreq🇨🇭

    Axion-like particles (ALPs) with couplings to electromagnetism have long been postulated as extensions to the Standard Model. String theory predicts an "axiverse" of many light axions, some of which may make up the dark matter in the universe and/or solve the strong CP problem. We propose a new experiment using superconducting radiofrequency (SRF) cavities which is sensitive to light ALPs independent of their contribution to the cosmic dark matter density. Off-shell ALPs will source cubic nonlinearities in Maxwell's equations, such that if a SRF cavity is pumped at frequencies ${\omega }_1$ and ${\omega }_2$, in the presence of ALPs there will be power in modes with frequencies $2{\omega }_1\pm {\omega }_2$. Our setup is similar in spirit to light-shining-through-walls (LSW) experiments, but because the pump field itself effectively converts the ALP back to photons inside a single cavity, our sensitivity scales differently with the strength of the external fields, allowing for superior reach as compared to experiments like OSQAR while utilizing current technology. Furthermore, a well-defined program of increasing sensitivity has a guaranteed physics result: the first observation of the Euler-Heisenberg term of low-energy QED at energies below the electron mass. We discuss how the ALP contribution may be separated from the QED contribution by a suitable choice of pump modes and cavity geometry, and conclude by describing the ultimate sensitivity of our proposed program of experiments to ALPs.

    hep-phhep-exphysics.ins-detPRL(2019)·68 citations
19. 19*

    Extending the Bump Hunt with Machine Learning

    Jack H Collins🇺🇸 · Kiel Howe🇺🇸 · Benjamin Nachman🇺🇸

    The oldest and most robust technique to search for new particles is to look for `bumps' in invariant mass spectra over smoothly falling backgrounds. We present a new extension of the bump hunt that naturally benefits from modern machine learning algorithms while remaining model-agnostic. This approach is based on the Classification Without Labels (CWoLa) method where the invariant mass is used to create two potentially mixed samples, one with little or no signal and one with a potential resonance. Additional features that are uncorrelated with the invariant mass can be used for training the classifier. Given the lack of new physics signals at the Large Hadron Collider (LHC), such model-agnostic approaches are critical for ensuring full coverage to fully exploit the rich datasets from the LHC experiments. In addition to illustrating how the new method works in simple test cases, we demonstrate the power of the extended bump hunt on a realistic all-hadronic resonance search in a channel that would not be covered with existing techniques.

    hep-phhep-exPRD(2019)·196 citations
20. 20*

    The Neutrino Puzzle: Anomalies, Interactions, and Cosmological Tensions

    Christina D. Kreisch🇺🇸 · Francis-Yan Cyr-Racine🇺🇸 · Olivier Doré🇺🇸

    New physics in the neutrino sector might be necessary to address anomalies between different neutrino oscillation experiments. Intriguingly, it also offers a possible solution to the discrepant cosmological measurements of $H_0$ and ${\sigma }_8$. We show here that delaying the onset of neutrino free-streaming until close to the epoch of matter-radiation equality can naturally accommodate a larger value for the Hubble constant $H_0=72.3\pm 1.4$ km/s/Mpc and a lower value of the matter fluctuations ${\sigma }_8=0.786\pm 0.020$, while not degrading the fit to the cosmic microwave background (CMB) damping tail. We achieve this by introducing neutrino self-interactions in the presence of a non-vanishing sum of neutrino masses. This strongly interacting neutrino cosmology prefers $N_{\mathrm{eff}}=4.02\pm 0.29$, which has interesting implications for particle model-building and neutrino oscillation anomalies. We show that the absence of the neutrino free-streaming phase shift on the CMB can be compensated by shifting the value of other cosmological parameters, hence providing an important caveat to the detections made in the literature. Due to their impact on the evolution of the gravitational potential at early times, self-interacting neutrinos and their subsequent decoupling leave a rich structure on the matter power spectrum. In particular, we point out the existence of a novel localized feature appearing on scales entering the horizon at the onset of neutrino free-streaming. While the interacting neutrino cosmology provides a better global fit to current cosmological data, we find that traditional Bayesian analyses penalize the model as compared to the standard cosmological. Our analysis shows that it is possible to find radically different cosmological models that nonetheless provide excellent fits to the data, hence providing an impetus to thoroughly explore alternate cosmological scenarios.

    ↳ astro-ph.COhep-phPRD(2020)·433 citations
21. 21*

    Systematic uncertainties in parton distribution functions from lattice QCD simulations at the physical point

    Constantia Alexandrou🇨🇾 · Krzysztof Cichy🇵🇱 · Martha Constantinou🇺🇸 · Kyriakos Hadjiyiannakou🇨🇾 · Karl Jansen🇩🇪 · Aurora Scapellato🇨🇾 · Fernanda Steffens🇩🇪

    We present a detailed study of the helicity-dependent and helicity-independent collinear parton distribution functions (PDFs) of the nucleon, using the quasi-PDF approach. The lattice QCD computation is performed employing twisted mass fermions with a physical value of the light quark mass. We give a systematic and in-depth account of the salient features entering in the evaluation of quasi-PDFs and their relation to the light-cone PDFs. In particular, we give details for the computation of the matrix elements, including the study of the various sources of systematic uncertainties, such as excited states contamination. In addition, we discuss the non-perturbative renormalization scheme used here and its systematics, effects of truncating the Fourier transform and different matching prescriptions.

    ↳ hep-lathep-phPRD(2019)·124 citations
22. 22*

    Effects of strong magnetic fields on neutron ${}^3{P}_2$ superfluidity with spin-orbit interactions

    Shigehiro Yasui🇯🇵 · Chandrasekhar Chatterjee🇯🇵 · Muneto Nitta🇯🇵

    We discuss neutron ${}^3{P}_2$ phases in the core of neutron stars in strong magnetic field (magnetars). The neutron ${}^3{P}_2$ pairing provides a wide variety of condensates, such as the uniaxial nematic and (D${}_2$ and D${}_4$) biaxial nematic, with different symmetries stemming from the combinations of spin and momentum. Based on the spin-orbital angular momentum coupling and the spin-magnetic field coupling of the neutrons, we derive the Ginzburg-Landau equation containing higher order terms of the magnetic field. We investigate the phase diagram of the neutron ${}^3{P}_2$ superfluidity, and find that the D${}_2$ biaxial nematic phase is extended by the higher order terms of the magnetic field. We also discuss the thermodynamic properties, the heat capacity and the spin susceptibility.

    ↳ nucl-thastro-ph.HEcond-mat.supr-conhep-phJPS Conf.Proc.(2019)·11 citations
23. 23*

    Nuclear electric dipole moment as a good probe of CP violation

    Nodoka Yamanaka🇫🇷

    The electric dipole moment (EDM) is an excellent probe of new physics beyond the standard model of particle physics. The EDM of light nuclei is particularly interesting due to the high sensitivity to the hadron level CP violation. In this proceedings contribution, we investigate the mechanism of the generation of the EDM for several light nuclei and the prospect for the discovery of new physics.

    ↳ nucl-thhep-exhep-phnucl-exJPS Conf.Proc.(2019)·0 citations
24. 24*

    General Modified Friedmann Equations in Rainbow Flat Universe, by Thermodynamics

    A. Ashour (Damascus Univ.) · M. Alcheikh (Damascus Univ.) · N. Chamoun (HIAST)🇸🇾

    We investigate the derivation of Friedmann equations in Rainbow gravity following Jacobson thermodynamic approach. We do not restrict the rainbow functions to be constant as is customarily used, and show that the first law of thermodynamics with a corresponding `classical' proportionality between entropy and surface area, supplemented eventually by a `quantum' logarithmic correction, are not in general sufficient to obtain the equations in flat FRW metrics.

    ↳ gr-qchep-phEPJC(2019)·1 citation
25. 25*

    Cosmological constraints on the velocity-dependent baryon-dark matter coupling

    Junpei Ooba🇯🇵 · Horoyuki Tashiro🇯🇵 · Kenji Kadota🇰🇷

    We present the cosmological constraints on the cross section of baryon-dark matter interactions for the dark matter mass below the MeV scale from the Planck CMB (cosmic microwave background) and SDSS (Sloan Digital Sky Survey) Lyman-$\alpha$ forest data. To explore the dark matter mass $m_{\chi }\lesssim 1$ MeV for which the dark matter's free-streaming effect can suppress the observable small scale density fluctuations, in addition to the acoustic oscillation damping in existence of the baryon-dark matter coupling, we apply the approximated treatment of dark matter free-streaming analogous to that of the conventional warm dark matter. We also demonstrate the mass dependence of the baryon-dark matter cross section bounds (for the dark matter mass down to $m_{\chi }\sim 5\mathrm{keV}$), in contrast to the dark matter mass independence of the cross section constraints for the light dark matter below the MeV scale claimed in the previous literature.

    ↳ astro-ph.COhep-phJCAP(2019)·18 citations
26. 26*

    Hadronic vacuum polarization contribution to the muon $g-2$ with 2+1 flavor lattice QCD on a larger than (10 fm${)}^4$ lattice at the physical point

    Eigo Shintani🇯🇵 · Yoshinobu Kuramashi🇯🇵

    We study systematic uncertainties in the lattice QCD computation of hadronic vacuum polarization (HVP) contribution to the muon $g-2$. We investigate three systematic effects; finite volume (FV) effect, cutoff effect, and integration scheme dependence. We evaluate the FV effect at the physical pion mass on two different volumes of (5.4 fm${)}^4$ and (10.8 fm${)}^4$ using the PACS10 configurations at the same cutoff scale. For the cutoff effect, we compare two types of lattice vector operators, which are local and conserved (point-splitting) currents, by varying the cutoff scale on a larger than (10 fm${)}^4$ lattice at the physical point. For the integration scheme dependence, we compare the results between the coordinate- and momentum-space integration schemes at the physical point on a (10.8 fm${)}^4$ lattice. Our result for the HVP contribution to the muon $g-2$ is given by $a_{\mu }^{\mathrm{hvp}}=737(9){(}_{-18}^{+13})\times 10^{-10}$ in the continuum limit, where the first error is statistical and the second one is systematic.

    ↳ hep-lathep-exhep-phPRD(2019)·150 citations
27. 27*

    Probing the Fundamental Nature of Dark Matter with the Large Synoptic Survey Telescope

    Alex Drlica-Wagner🇺🇸 · Yao-Yuan Mao🇺🇸 · Susmita Adhikari🇺🇸 · Robert Armstrong🇺🇸 · Arka Banerjee🇺🇸 · Nilanjan Banik🇳🇱 · Keith Bechtol🇺🇸 · Simeon Bird🇺🇸 · Kimberly K. Boddy🇺🇸 · Ana Bonaca🇺🇸 · Jo Bovy🇨🇦 · Matthew R. Buckley🇺🇸 and 88 other authors

    Astrophysical and cosmological observations currently provide the only robust, empirical measurements of dark matter. Future observations with Large Synoptic Survey Telescope (LSST) will provide necessary guidance for the experimental dark matter program. This white paper represents a community effort to summarize the science case for studying the fundamental physics of dark matter with LSST. We discuss how LSST will inform our understanding of the fundamental properties of dark matter, such as particle mass, self-interaction strength, non-gravitational couplings to the Standard Model, and compact object abundances. Additionally, we discuss the ways that LSST will complement other experiments to strengthen our understanding of the fundamental characteristics of dark matter. More information on the LSST dark matter effort can be found at https://lsstdarkmatter.github.io/ .

    ↳ astro-ph.COastro-ph.GAastro-ph.HEhep-ex+1194 citations
28. 28*

    Energy shift of the three-particle system in a finite volume

    Jin-Yi Pang🇩🇪 · Jia-Jun Wu🇨🇳 · H.-W. Hammer🇩🇪 · Ulf-G. Meißner🇩🇪 · Akaki Rusetsky🇩🇪

    Using the three-particle quantization condition recently obtained in the particle-dimer framework, the finite-volume energy shift of the two lowest three-particle scattering states is derived up to and including order $L^{-6}$. Furthermore, assuming that a stable dimer exists in the infinite volume, the shift for the lowest particle-dimer scattering state is obtained up to and including order $L^{-3}$. The result for the lowest three-particle state agrees with the results from the literature, and the result for the lowest particle-dimer state reproduces the one obtained by using the Luescher equation.

    ↳ hep-lathep-phPRD(2019)·89 citations
29. 29*

    Cosmological Shapes of Higher-Spin Gravity

    D. Anninos🇬🇧 · V. De Luca🇨🇭 · G. Franciolini🇨🇭 · A. Kehagias🇬🇷 · A. Riotto🇨🇭

    We explore non-Gaussian features of a massless spin-two field in the Vasiliev theory of higher-spin gravity. The theory contains an infinite tower of interacting gauge fields with increasing spin, and admits four-dimensional asymptotically de Sitter configurations. Using a recent proposal for calculating late-time quantum correlations in Vasiliev theory, we provide an exact formula for the tensor non-Gaussianities of the massless spin-two graviton field. By general symmetry considerations, we relate our result to that produced by a tree-level calculation in a gravitational theory containing an Einstein term and a term cubic in the Weyl tensor. The relative coefficient between the two terms is calculated explicitly, exhibiting a significant contribution from the Weyl cubed term. We discuss potential cosmological implications of our results.

    ↳ hep-thastro-ph.COgr-qchep-phJCAP(2019)·48 citations
30. 30*

    Probing gravity at sub-femtometer scales through the pressure distribution inside the proton

    P. P. Avelino🇵🇹

    Recently, a measurement of the pressure distribution experienced by the quarks inside the proton has found a strong repulsive (positive) pressure at distances up to 0.6 femtometers from its center and a (negative) confining pressure at larger distances. In this paper we show that this measurement puts significant constraints on modified theories of gravity in which the strength of the gravitational interaction on microscopic scales is enhanced with respect to general relativity. We consider the particular case of Eddington-inspired Born-Infeld gravity, showing that strong limits on $\kappa$, the only additional parameter of the theory with respect to general relativity, may be derived from the quark pressure measurement ($|\kappa |\text{lsim}10^{-1}{\mathrm{m}}^5\mathrm{k}{\mathrm{g}}^{-1}{\mathrm{s}}^{-2}$). Furthermore, we show how these limits may be significantly improved with precise measurements of the first and second moments of the pressure distribution inside the proton.

    ↳ gr-qcastro-ph.COhep-phhep-th+1PLB(2019)·24 citations
31. 31*

    Understanding KKLT from a 10d perspective

    Yuta Hamada🇬🇷 · Arthur Hebecker🇩🇪 · Gary Shiu🇺🇸 · Pablo Soler🇩🇪

    Some of the most well-celebrated constructions of metastable de Sitter vacua from string theory, such as the KKLT proposal, involve the interplay of gaugino condensation on a D7-brane stack and an uplift by a positive tension object. These constructions have recently been challenged using arguments that rely on the trace-reversed and integrated 10d Einstein equation. We give a critical assessment of such concerns. We first relate an integrated 10d Einstein equation to the extremization condition for a 10d-derived 4d effective potential. Then we argue how to obtain the latter from a 10d action which incorporates gaugino condensation in a (recently proposed) manifestly finite, perfect-square form. This effective potential is consistent with 4d supergravity and does not present obstacles for an uplifted minimum. Moreover, within standard approximations, we understand the uplift explicitly in one of the popular versions of the integrated 10d equation. Our conclusion is that de Sitter constructions of the KKLT type cannot be dismissed simply based on the integrated 10d equations considered so far.

    ↳ hep-thastro-ph.COhep-phJHEP(2019)·94 citations
32. 32*

    Gaugino condensation and small uplifts in KKLT

    Federico Carta🇩🇪 · Jakob Moritz🇩🇪 · Alexander Westphal🇩🇪

    In the first part of this note we argue that ten dimensional consistency requirements in the form of a certain tadpole cancellation condition can be satisfied by KKLT type vacua of type IIB string theory. We explain that a new term of non-local nature is generated dynamically once supersymmetry is broken and ensures cancellation of the tadpole. It can be interpreted as the stress caused by the restoring force that the stabilization mechanism exerts on the volume modulus. In the second part, we explain that it is surprisingly difficult to engineer sufficiently long warped throats to prevent decompactification which are also small enough in size to fit into the bulk Calabi-Yau (CY). We give arguments that achieving this with reasonable amount of control may not be possible in generic CY compactifications while CYs with very non-generic geometrical properties might evade our conclusion.

    ↳ hep-thgr-qchep-phJHEP(2019)·128 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.