Tue·Jul 11, 2017Tuesday·July 11, 2017

1. 01*

   Nuclear Structure of Bound States of Asymmetric Dark Matter

   Moira I. Gresham🇺🇸 · Hou Keong Lou🇺🇸 · Kathryn M. Zurek🇺🇸

   Models of Asymmetric Dark Matter (ADM) with a sufficiently attractive and long-range force gives rise to stable bound objects, analogous to nuclei in the Standard Model, called nuggets. We study the properties of these nuggets and compute their profiles and binding energies. Our approach, applicable to both elementary and composite fermionic ADM, utilizes relativistic mean field theory, and allows a more systematic computation of nugget properties, over a wider range of sizes and force mediator masses, compared to previous literature. We identify three separate regimes of nugget property behavior corresponding to (1) non-relativistic and (2) relativistic constituents in a Coulomb-like limit, and (3) saturation in an anti-Coulomb limit when the nuggets are large compared to the force range. We provide analytical descriptions for nuggets in each regime. Through numerical calculations, we are able to confirm our analytic descriptions and also obtain smooth transitions for the nugget profiles between all three regimes. We also find that over a wide range of parameter space, the binding energy in the saturation limit is an $\mathcal{O}(1)$ fraction of the constituent's mass, significantly larger than expectations in the non-relativistic case. In a companion paper, we apply our results to synthesis of ADM nuggets in the early Universe.

   hep-phPRD(2017)·105 citations
2. 02*

   Making Asymmetric Dark Matter Gold: Early Universe Synthesis of Nuggets

   Moira I. Gresham🇺🇸 · Hou Keong Lou🇺🇸 · Kathryn M. Zurek🇺🇸

   We compute the mass function of bound states of Asymmetric Dark Matter--nuggets--synthesized in the early Universe. We apply our results for the nugget density and binding energy computed from a nuclear model to obtain analytic estimates of the typical nugget size exiting synthesis. We numerically solve the Boltzmann equation for synthesis including two-to-two fusion reactions, estimating the impact of bottlenecks on the mass function exiting synthesis. These results provide the basis for studying the late Universe cosmology of nuggets in a future companion paper.

   hep-phastro-ph.HEPRD(2018)·122 citations
3. 03*

   A QCD sum rules calculation of the ${\eta }_c{D}^{\ast }D$ and ${\eta }_c{D}_s^{\ast }{D}_s$ form factors and strong coupling constants

   B. Osório Rodrigues🇧🇷 · M. E. Bracco🇧🇷 · C. M. Zanetti🇧🇷

   We use the QCD sum rules for the three point correlation functions to compute the strong coupling constants of the meson vertices ${\eta }_c{D}^{\ast }D$ and ${\eta }_c{D}_s^{\ast }{D}_s$. We consider perturbative and non-perturbative contributions, working up to dimension five on the OPE. The vertices were studied considering that each one of its three mesons are off-shell alternately. The vertex coupling constant is evaluated through the extrapolation of the three different form factors. The results obtained for the coupling constants are $g_{{\eta }_c{D}^{\ast }D}=5.23_{-1.38}^{+1.80}$ and $g_{{\eta }_c{D}_s^{\ast }{D}_s}=5.55_{-1.55}^{+1.29}$.

   hep-phNPA(2017)·7 citations
4. 04*

   A Study of Dark Matter and QCD-Charged Mediators in the Quasi-Degenerate Regime

   Andrew Davidson🇺🇸 · Chris Kelso🇺🇸 · Jason Kumar🇺🇸 · Pearl Sandick🇺🇸 · Patrick Stengel🇺🇸

   We study a scenario in which the only light new particles are a Majorana fermion dark matter candidate and one or more QCD-charged scalars, which couple to light quarks. This scenario has several interesting phenomenological features if the new particles are nearly degenerate in mass. In particular, LHC searches for the light scalars have reduced sensitivity, since the visible and invisible products tend to be softer. Moreover, dark matter-scalar co-annihilation can allow even relatively heavy dark matter candidates to be consistent thermal relics. Finally, the dark matter nucleon scattering cross section is enhanced in the quasi-degenerate limit, allowing direct detection experiments to use both spin-independent and spin-dependent scattering to probe regions of parameter space beyond those probed by the LHC. Although this scenario has broad application, we phrase this study in terms of the MSSM, in the limit where the only light sparticles are a bino-like dark matter candidate and light-flavored squarks.

   hep-phPRD(2017)·5 citations
5. 05*

   Searching for left sneutrino LSP at the LHC

   Pradipta Ghosh🇮🇳 · Inaki Lara🇪🇸 · Daniel E. Lopez-Fogliani🇦🇷 · Carlos Munoz🇪🇸 · Roberto Ruiz de Austri🇪🇸

   We analyze relevant signals expected at the LHC for a left sneutrino as the lightest supersymmetric particle (LSP). The discussion is carried out in the `$\mu$ from $\nu$' supersymmetric standard model ($\mu \nu$SSM), where the presence of $R$-parity breaking couplings involving right-handed neutrinos solves the $\mu$ problem and reproduces neutrino data. The sneutrinos are pair produced via a virtual $W$, $Z$ or $\gamma$ in the $s$ channel. From the prompt decay of a pair of left sneutrinos LSPs of any family, a significant diphoton signal plus missing transverse energy (MET) from neutrinos can be present in the mass range 118-132 GeV, with 13 TeV center-of-mass energy and an integrated luminosity of 100 fb${}^{-1}$. In addition, in the case of a pair of tau left sneutrinos LSPs, given the large value of the tau Yukawa coupling diphoton plus leptons and/or multileptons can appear. We find that the number of expected events for the multilepton signal, together with properly adopted search strategies, is sufficient to give a significant evidence for a sneutrino of mass in the range 130-310 GeV, even with the integrated luminosity of 20 fb${}^{-1}$. In the case of the signal producing diphoton plus leptons, an integrated luminosity of 100 fb${}^{-1}$ is needed to give a significant evidence in the mass range 95-145 GeV. Finally, we discuss briefly the presence of displaced vertices and the associated range of masses.

   hep-phhep-exhep-thInt.J.Mod.Phys.A(2018)·37 citations
6. 06*

   Branching ratios, $CP$ asymmetries and polarizations of $B\to \psi (2S)V$ decays

   Zhou Rui🇨🇳 · Ya Li🇨🇳 · Zhen-Jun Xiao🇨🇳

   We analyzed the nonleptonic decays $B/B_s\to \psi (2S)V$ with $V=(\rho ,\omega ,K^{\ast },\varphi )$ by employing the perturbative QCD (PQCD) factorization approach. Here the branching ratios, the $CP$ asymmetries and the complete set of polarization observables are investigated systematically. Besides the traditional contributions from the factorizable and nonfactorizable diagrams at the leading order, the next-to-leading order (NLO) vertex corrections could also provide considerable contributions. The PQCD predictions for the branching ratios of the $B_{(s)}\to \psi (2S)K^{\ast },\psi (2S)\varphi$ decays are consistent with the measured values within errors. As for $B\to \psi (2S)\rho ,\psi (2S)\omega$ decays, the branching ratios can reach the order of $10^{-5}$ and could be measured in the LHCb and Belle-II experiments. The numerical results show that the direct $CP$ asymmetries of the considered decays are very small. Thus the observation of any large direct $CP$ asymmetry for these decays will be a signal for new physics. The mixing induced $CP$ asymmetries in the neutral modes are very close to $\sin 2{\beta }_{(s)}$, which suggests that these channels can give a cross-check on the measurement of the Cabbibo-Kobayashi-Maskawa (CKM) angle $\beta$ and ${\beta }_s$. We found that the longitudinal polarization fractions $f_0$ are suppressed to $\sim 50\%$ due to the large nonfactorizable contributions. The magnitudes and phases of the two transverse amplitudes ${\mathcal{A}}_{\parallel }$ and ${\mathcal{A}}_{\perp }$ are roughly equal, which is an indication for the approximate light quark helicity conservation in these decays. The overall polarization observables of $B\to \psi (2S)K^{\ast 0}$ and $B_s\to \psi (2S)\varphi$ channels are also in good agreement with the experimental measurements as reported by LHCb and BaBar. Other results can also be tested by the LHCb and Belle-II experiments.

   hep-phEPJC(2017)·16 citations
7. 07*

   Estimating the production rates of D-wave charmed mesons via the semileptonic decays of bottom mesons

   Kan Chen🇨🇳 · Hong-Wei Ke · Xiang Liu🇨🇳 · Takayuki Matsuki🇯🇵

   In this work, using the covariant light front approach with conventional vertex functions, we estimate the production rates of $D$-wave charmed/charmed-strange mesons via $B_{(s)}$ semileptonic decays. Due to these calculated considerable production rates, it is possible to experimentally search for $D$-wave charmed/charmed-strange mesons via the semileptonic decays, which may provide extra approach to explore $D$-wave charmed/charmed-strange mesons.

   hep-phCPC(2019)·7 citations
8. 08*

   Analysis of excited quark propagator effects on neutron charge form factor

   X.Y. Liu🇨🇳 · A. Limphirat🇹🇭 · K. Xu · D. Samart🇹🇭 · K. Khosonthongkee🇹🇭 · Y. Yan🇹🇭

   The charge form factor and charge radius of neutron are investigated in the perturbative chiral quark model (PCQM) with considering both the ground and excited states in the quark propagator. A Cornell-like potential is extracted in accordance with the predetermined ground state quark wavefunction, and the excited quark states are derived by solving the Dirac equation with the extracted PCQM potential numerically. The study reveals that the contributions of the excited quark states are considerably influential in the charge form factor and charge radius of neutron as expected, and the total results are significantly improved and increased by nearly four times by including the excited states in the quark propagator. The theoretical PCQM results are found, including the ground and excited quark propagators, in good agreement with the recent lattice QCD values at pion mass of about 130 MeV.

   hep-phEur. Phys. J. A (2019) 55: 218·1 citation
9. 09*

   Heavy sterile neutrino in dark matter searches

   Paraskevi C. Divari🇬🇷 · John D. Vergados🇬🇷

   Sterile neutrinos are possible dark matter candidates. We examine here possible detection mechanisms, assuming that the neutrino has a mass of about 50 keV and couples to the ordinary neutrino. Even though this neutrino is quite heavy, it is non relativistic with a maximum kinetic energy of 0.1 eV. Thus new experimental techniques are required for its detection. We estimate the expected event rate in the following cases: i) Measure electron recoils in the case of materials with very low electron binding. ii) Low temperature crystal bolometers. iii) Spin induced atomic excitations at very low temperatures, leading to a characteristic photon spectrum. iv) Observation of resonances in antineutrino absorption by a nucleus undergoing electron capture. v) Neutrino induced electron events beyond the end point energy of beta decaying systems, e.g. in the tritium decay studied by KATRIN.

   hep-phastro-ph.HEnucl-thAdv.High Energy Phys.(2018)·6 citations
10. 10*

    Probing $Z$-$Z^{\prime }$ mixing with ATLAS and CMS resonant diboson production data at the LHC at $\sqrt{s}=13$ TeV

    P. Osland🇳🇴 · A. A. Pankov🇧🇾 · A. V. Tsytrinov🇧🇾

    The study of electroweak boson pair production provides a powerful test of the spontaneously broken gauge symmetry of the Standard Model (SM) and can be used to search for new phenomena beyond the SM. Extra neutral vector bosons $Z^{\prime }$ decaying to charged gauge vector boson pairs $W^{+}{W}^{-}$ are predicted in many scenarios of new physics, including models with an extended gauge sector. The diboson production allows to place stringent constraints on the $Z$-$Z^{\prime }$ mixing factor $\xi$ and $Z^{\prime }$ mass, $M_{Z^{\prime }}$. We present the $Z^{\prime }$ exclusion region in the $\xi -M_{Z^{\prime }}$ plane for the first time by using data comprised of $pp$ collisions at $\sqrt{s}=13$ TeV and recorded by the ATLAS and CMS detectors at the CERN LHC, with integrated luminosities of 13.2 and 35.9 fb${}^{-1}$, respectively. The exclusion region has been significantly extended compared to that obtained from the previous analysis performed with Tevatron data as well as with LHC data collected at 7 and 8 TeV. Also, we found that these constraints on the $Z$-$Z^{\prime }$ mixing factor are more severe than those derived from the global analysis of electroweak data. Further improvement on the constraining of this mixing can be achieved from the analysis of data to be collected at higher luminosity.

    hep-phPRD(2017)·16 citations
11. 11*

    Magnetic moments of the doubly charmed and bottomed baryons

    Hao-Song Li🇨🇳 · Lu Meng🇨🇳 · Zhan-Wei Liu🇨🇳 · Shi-Lin Zhu🇨🇳

    The chiral corrections to the magnetic moments of the spin-$\frac{1}{2}$ doubly charmed baryons are systematically investigated up to next-to-next-to-leading order with heavy baryon chiral perturbation theory (HBChPT). The numerical results are calculated up to next-to-leading order: ${\mu }_{{\Xi }_{cc}^{++}}=-0.25{\mu }_N$, ${\mu }_{{\Xi }_{cc}^{+}}=0.85{\mu }_N$, ${\mu }_{{\Omega }_{cc}^{+}}=0.78{\mu }_N$. We also calculate the magnetic moments of the other doubly heavy baryons, including the doubly bottomed baryons (bbq) and the doubly heavy baryons containing a light quark, a charm quark and a bottom quark ($\{bc\}q$ and $[bc]q$): ${\mu }_{{\Xi }_{bb}^0}=-0.84{\mu }_N$, ${\mu }_{{\Xi }_{bb}^{-}}=0.26{\mu }_N$, ${\mu }_{{\Omega }_{bb}^{-}}=0.19{\mu }_N$, ${\mu }_{{\Xi }_{\{bc\}q}^{+}}=-0.54{\mu }_N$, ${\mu }_{{\Xi }_{\{bc\}q}^0}=0.56{\mu }_N$, ${\mu }_{{\Omega }_{\{bc\}q}^0}=0.49{\mu }_N$, ${\mu }_{{\Xi }_{[bc]q}^{+}}=0.69{\mu }_N$, ${\mu }_{{\Xi }_{[bc]q}^0}=-0.59{\mu }_N$, ${\mu }_{{\Omega }_{[bc]q}^0}=0.24{\mu }_N$.

    hep-phhep-exhep-latnucl-ex+1PRD(2017)·66 citations
12. 12*

    Probing Saturation Physics in the Real Compton Scattering at Ultraperipheral $pPb$ Collisions

    V. P. Goncalves🇧🇷 · F. S. Navarra🇧🇷 · D. Spiering🇧🇷

    The Real Compton Scattering in ultraperipheral $pPb$ collisions at RHIC and LHC energies is investigated and predictions for the squared transverse momentum ($t$) and rapidity ($Y$) distributions are presented. The scattering amplitude is assumed to be given by the sum of the Reggeon and Pomeron contributions and the Pomeron one is described by the Color Dipole formalism taking into account the non - linear (saturation) effects in the QCD dynamics. We demonstrate that the behaviour of the cross sections at large -- $t$ and/or $Y$ is dominated by the Pomeron contribution and is strongly affected by the non -- linear effects present in the QCD dynamics. These results indicate that a future experimental analysis of this process can be useful to probe the QCD dynamics at high energies.

    hep-phhep-exnucl-exnucl-thPLB(2017)·2 citations
13. 13*

    Weak Decays of Doubly Heavy Baryons: the $1/2\to 1/2$ case

    Wei Wang🇨🇳 · Fu-Sheng Yu🇨🇳 · Zhen-Xing Zhao🇨🇳

    Very recently, the LHCb collaboration has observed in the final state ${\Lambda }_c^{+}{K}^{-}{\pi }^{+}{\pi }^{+}$ a resonant structure that is identified as the doubly-charmed baryon ${\Xi }_{cc}^{++}$. Inspired by this observation, we investigate the weak decays of doubly heavy baryons ${\Xi }_{cc}^{++}$, ${\Xi }_{cc}^{+}$, ${\Omega }_{cc}^{+}$, ${\Xi }_{bc}^{(\prime )+}$, ${\Xi }_{bc}^{(\prime )0}$, ${\Omega }_{bc}^{(\prime )0}$, ${\Xi }_{bb}^0$, ${\Xi }_{bb}^{-}$ and ${\Omega }_{bb}^{-}$ and focus on the decays into spin $1/2$ baryons in this paper. At the quark level these decay processes are induced by the $c\to d/s$ or $b\to u/c$ transitions, and the two spectator quarks can be viewed as a scalar or axial vector diquark. We first derive the hadronic form factors for these transitions in the light-front approach and then apply them to predict the partial widths for the semi-leptonic and non-leptonic decays of doubly heavy baryons. We find that a number of decay channels are sizable and can be examined in future measurements at experimental facilities like LHC, Belle II and CEPC.

    hep-phhep-exEPJC(2017)·167 citations
14. 14*

    New analysis of $\eta \pi$ tensor resonances measured at the COMPASS experiment

    A. Jackura · C. Fernandez-Ramirez · M. Mikhasenko · A. Pilloni · V. Mathieu · J. Nys · V. Pauk · A. P. Szczepaniak · G. Fox · M. Aghasyan · R. Akhunzyanov · M.G. Alexeev and 225 other authors

    We present a new amplitude analysis of the $\eta \pi$ $D$-wave in ${\pi }^{-}p\to \eta {\pi }^{-}p$ measured by COMPASS. Employing an analytical model based on the principles of the relativistic $S$-matrix, we find two resonances that can be identified with the $a_2(1320)$ and the excited $a_2^{\prime }(1700)$, and perform a comprehensive analysis of their pole positions. For the mass and width of the $a_2$ we find $M=(1307\pm 1\pm 6)$~MeV and $\Gamma =(112\pm 1\pm 8)$~MeV, and for the excited state $a_2^{\prime }$ we obtain $M=(1720\pm 10\pm 60)$~MeV and $\Gamma =(280\pm 10\pm 70)$~MeV, respectively.

    hep-phhep-exPLB(2018)·31 citations
15. 15*

    Branching fractions of semileptonic $D$ and $D_s$ decays from the covariant light-front quark model

    Hai-Yang Cheng🇹🇼 · Xian-Wei Kang🇹🇼

    Based on the predictions of the relevant form factors from the covariant light-front quark model, we show the branching fractions for the $D(D_s)\to (P,S,V,A)\ell {\nu }_{\ell }$ ($\ell =e$ or $\mu$) decays, where $P$ denotes the pseudoscalar meson, $S$ the scalar meson with a mass above 1 GeV, $V$ the vector meson and $A$ the axial-vector one. Comparison with the available experimental results are made, and we find an excellent agreement. The predictions for other decay modes can be tested in a charm factory, e.g., the BESIII detector. The future measurements will definitely further enrich our knowledge on the hadronic transition form factor as well as the inner structure of the even-parity mesons ($S$ and $A$).

    hep-phhep-exEPJC(2017)·106 citations
16. 16*

    Leptonic Flavor Structure in the Brane Shifted Extra Dimensional Seesaw Mechanism

    Mathias Becker🇩🇪 · Heinrich Päs🇩🇪

    We discuss the leptonic flavor structure generated by a brane shifted extra dimensional seesaw model with a single right handed neutrino in the bulk. In contrast to previous works, no unitarity approximation for the $3\times 3$ submatrix has been employed. This allows to study phenomenological signatures such as lepton flavor violating decays. A strong prediction of the model, assuming CP conservation, are the ratios of flavor violating charged lepton decay and Z decay branching ratios which are correlated with the neutrino mixing angles and the neutrino mass hierarchy. Furthermore, it is possible to obtain branching ratios for $\mu \to e\gamma$ close to the experimental bounds even with Yukawa couplings of order one.

    hep-phEPJC(2018)·4 citations
17. 17*

    Asymptotically Safe Standard Model via Vector-Like Fermions

    Robert Mann🇨🇦 · Julia Meffe🇨🇦 · Francesco Sannino🇩🇰 · Tom Steele🇨🇦 · Zhi-Wei Wang🇩🇰 · Chen Zhang🇨🇦

    We construct asymptotically safe extensions of the Standard Model by adding gauged vector-like fermions. Using large number-of-flavour techniques we argue that all gauge couplings, including the hypercharge and, under certain conditions, the Higgs coupling can achieve an interacting ultraviolet fixed point.

    hep-phhep-lathep-thPRL(2017)·71 citations
18. 18*

    Hot Leptogenesis from Thermal Dark Matter

    Nicolás Bernal🇨🇴 · Chee Sheng Fong🇧🇷

    In this work, we investigate a scenario in which heavy Majorana Right-Handed Neutrinos (RHNs) are in thermal equilibrium with a dark sector with temperature higher than the Standard Model (SM) thermal bath. Specifically, we consider the scenario in which thermal Dark Matter (DM) abundance is fixed from the freeze-out of DM annihilations into RHNs. Due to the inert nature of the RHNs, we show that it is possible for the two sectors to remain thermally decoupled by having more than two generations of the RHNs. The hotter temperature implies higher abundances of DM and RHNs with the following consequences. For leptogenesis, an enhancement in efficiency up to a factor of 51.6 can be obtained, though a resonant enhancement of CP violation is still required due to an upper mass bound of about 4 TeV for the RHNs. For the DM, an enhanced annihilation cross section up to a factor of 51.6 is required to obtain the correct DM abundance. This scenario can be probed via indirect detection of DM annihilating into RHNs, which then decay into $h\nu$, $Z\nu$ and $W^{\pm }{\ell }^{\mp }$ with an enhanced annihilation cross section above the typical thermal value.

    hep-phJCAP(2017)·21 citations
19. 19*

    Fast Radio Bursts from the Decay of Cosmic String Cusps

    Robert Brandenberger (1)🇨🇦 · Bryce Cyr (1)🇨🇦 · Aditya Varna Iyer (1) ((1) McGill University)🇨🇳

    We explore the possibility that Fast Radio Bursts are due to the annihilation of cusps on cosmic string loops. We compute the energy released in the annihilation events in the radio region, the expected event rate, and the time scale of the bursts. We find that the energy and event rates are sufficiently high and the time scale is sufficiently small to explain the current data. We predict how the event rate will change as the resolution of telescopes improves. Since the burst rate depends on the string tension, future data will allow the determination of the tension.

    ↳ astro-ph.COastro-ph.HEgr-qchep-ph+126 citations
20. 20*

    Gravitational Wave signatures of inflationary models from Primordial Black Hole Dark Matter

    Juan Garcia-Bellido🇪🇸 · Marco Peloso🇺🇸 · Caner Unal🇺🇸

    Primordial Black Holes (PBH) could be the cold dark matter of the universe. They could have arisen from large (order one) curvature fluctuations produced during inflation that reentered the horizon in the radiation era. At reentry, these fluctuations source gravitational waves (GW) via second order anisotropic stresses. These GW, together with those (possibly) sourced during inflation by the same mechanism responsible for the large curvature fluctuations, constitute a primordial stochastic GW background (SGWB) that unavoidably accompanies the PBH formation. We study how the amplitude and the range of frequencies of this signal depend on the statistics (Gaussian versus ${\chi }^2$) of the primordial curvature fluctuations, and on the evolution of the PBH mass function due to accretion and merging. We then compare this signal with the sensitivity of present and future detectors, at PTA and LISA scales. We find that this SGWB will help to probe, or strongly constrain, the early universe mechanism of PBH production. The comparison between the peak mass of the PBH distribution and the peak frequency of this SGWB will provide important information on the merging and accretion evolution of the PBH mass distribution from their formation to the present era. Different assumptions on the statistics and on the PBH evolution also result in different amounts of CMB $\mu$-distortions. Therefore the above results can be complemented by the detection (or the absence) of $\mu$-distortions with an experiment such as PIXIE.

    ↳ astro-ph.COhep-phhep-thJCAP(2017)·333 citations
21. 21*

    Anomalous current from covariant Wigner functions

    George Prokhorov🇷🇺 · Oleg Teryaev🇷🇺

    We consider accelerated and rotating media of weakly interacting fermions in local thermodynamic equilibrium. Kinetic properties of this media are described by covariant Wigner function calculated on the basis of relativistic distribution function of particles with spin. We obtain the formulae for axial current beyond the approximation of smallness of thermal vorticity tensor and chemical potential and calculate its divergence. In the massless limit higher order terms in vorticity and chemical potential compensate each other with only the low-order contributions surviving. It is shown, that axial current gets a topological component along the 4-acceleration vector. The similarity between different approaches to baryon polarisation is established.

    ↳ hep-thhep-phnucl-thPRD(2018)·30 citations
22. 22*

    Dissipative dark matter halos: The steady state solution

    R. Foot🇦🇺

    Dissipative dark matter, where dark matter particle properties closely resemble familiar baryonic matter, is considered. Mirror dark matter, which arises from an isomorphic hidden sector, is a specific and theoretically constrained scenario. Other possibilities include models with more generic hidden sectors that contain massless dark photons (unbroken $U(1)$ gauge interactions). Such dark matter not only features dissipative cooling processes, but is also assumed to have nontrivial heating sourced by ordinary supernovae (facilitated by the kinetic mixing interaction). The dynamics of dissipative dark matter halos around rotationally supported galaxies, influenced by heating as well as cooling processes, can be modelled by fluid equations. For a sufficiently isolated galaxy with stable star formation rate, the dissipative dark matter halos are expected to evolve to a steady state configuration which is in hydrostatic equilibrium and where heating and cooling rates locally balance. Here, we take into account the major cooling and heating processes, and numerically solve for the steady state solution under the assumptions of spherical symmetry, negligible dark magnetic fields, and that supernova sourced energy is transported to the halo via dark radiation. For the parameters considered, and assumptions made, we were unable to find a physically realistic solution for the constrained case of mirror dark matter halos. Halo cooling generally exceeds heating at realistic halo mass densities. This problem can be rectified in more generic dissipative dark matter models, and we discuss a specific example in some detail.

    ↳ astro-ph.GAastro-ph.HEhep-phPRD(2018)·20 citations
23. 23*

    Constraining dynamical neutrino mass generation with cosmological data

    S.M. Koksbang🇩🇰 · S. Hannestad🇩🇰

    We study models in which neutrino masses are generated dynamically at cosmologically late times. Our study is purely phenomenological and parameterized in terms of three effective parameters characterizing the redshift of mass generation, the width of the transition region, and the present day neutrino mass. We also study the possibility that neutrinos become strongly self-interacting at the time where the mass is generated. We find that in a number of cases, models with large present day neutrino masses are allowed by current CMB, BAO and supernova data. The increase in the allowed mass range makes it possible that a non-zero neutrino mass could be measured in direct detection experiments such as KATRIN. Intriguingly we also find that there are allowed models in which neutrinos become strongly self-interacting around the epoch of recombination.

    ↳ astro-ph.COhep-phJCAP(2017)·26 citations
24. 24*

    Three-dimensional density structure of La Soufrieère de Guadeloupe lava dome from simultaneous muon radiographies and gravity data

    Marina Rosas-Carbajal🇫🇷 · Kevin Jourde🇫🇷 · Jacques Marteau🇫🇷 · Sébastien Deroussi🇫🇷 · Jean-Christophe Komorowski🇫🇷 · Dominique Gibert🇫🇷

    Muon imaging has recently emerged as a powerful method to complement standard geophysical tools in the understanding of the Earth's subsurface. Muon measurements can yield a radiography of the average density along the muon path, allowing to image large volumes of a geological body from a single observation point. Here we jointly invert muon data from three simultaneous telescope acquisitions together with gravity data to estimate the three-dimensional density structure of the La Soufrière de Guadeloupe lava Dome. Our unique dataset allows us to achieve an unprecedented spatial resolution with this novel technique. The retrieved density model reveals an extensive, low-density anomaly where the most active part of the volcanic hydrothermal system is located, supporting previous studies that indicate this region as the most likely to be involved in a partial edifice collapse.

    ↳ physics.geo-phhep-exhep-phGeophys.Res.Lett.(2017)·22 citations
25. 25*

    Rapidity dependence of proton cumulants and correlation functions

    Adam Bzdak🇵🇱 · Volker Koch🇺🇸

    The dependence of multi-proton correlation functions and cumulants on the acceptance in rapidity and transverse momentum is studied. We find that the preliminary data of various cumulant ratios are consistent, within errors, with rapidity and transverse momentum independent correlation functions. However, rapidity correlations which moderately increase with rapidity separation between protons are slightly favored. We propose to further explore the rapidity dependence of multi-particle correlation functions by measuring the dependence of the integrated reduced correlation functions as a function of the size of the rapidity window.

    ↳ nucl-thhep-exhep-phnucl-exPRC(2017)·38 citations
26. 26*

    Neutron stars in the large-$N_c$ limit

    Francesco Giacosa🇩🇪 · Giuseppe Pagliara🇮🇹

    We study the phase transition from dense baryonic matter to dense quark matter within the large-$N_c$ limit. By using simple constant speed of sound equations of state for the two phases, we derive the scaling with $N_c$ of the critical quark chemical potential ${\mu }_c^{\mathrm{crit}}$ for this phase transition. While quark matter is strongly suppressed at large $N_c$, the phase transition at a large but finite density could nevertheless be important to determine the maximum mass of compact stars. In particular, in the range $3\le N_c\lesssim 5.5$ the quark phase would take place in compact stars and would lead to the formation of an unstable branch of hybrid stars. As a consequence, the maximum mass is restricted to the range $2.1M_{\odot }<M_{max}<3M_{\odot }$. For larger value of $N_c$, the phase transition would occur at densities too high to be reached in the core of compact stars. However, the very requirement that it occurs (although at a very large density) translates into interesting constraints on the stiffness of the baryonic phase: its speed of sound must exceed $\sqrt{1/3}$.

    ↳ nucl-thhep-phNPA(2017)·6 citations
27. 27*

    Delocalized SYZ Mirrors and Confronting Top-Down $SU(3)$-Structure Holographic Meson Masses at Finite $g$ and $N_c$ with P(article) D(ata) G(roup) Values

    Vikas Yadav🇮🇳 · Aalok Misra🇮🇳 · Karunava Sil🇮🇳

    Meson spectroscopy at finite gauge coupling - whereat any perturbative QCD computation would break down - and finite number of colors, from a top-down holographic string model, has thus far been entirely missing in the literature. This paper fills in this gap. Using the delocalized type IIA SYZ mirror (with $SU(3)$ structure) of the holographic type IIB dual of large-$N$ thermal QCD of arXiv:hep-th/0902.1540 as constructed in arXiv:hep-th/1306.4339 at finite coupling and number of colors ($N_c$ = Number of $D5(\overline{D5}$)-branes wrapping a vanishing two-cycle in the top-down holographic construct of arXiv:hep-th/0902.1540 = $\mathcal{O}(1)$ in the IR in the MQGP limit of arXiv:hep-th/1306.4339 at the end of a Seiberg duality cascade), we obtain analytical (not just numerical) expressions for the vector and scalar meson spectra and compare our results with previous calculations of hep-th/0412141, arXiv:1409.0559 [hep-th], and obtain a closer match with the Particle Data Group (PDG) results (Chin. Phys. C, 38, 090001 (2014) and 2015 update). Through explicit computations, we verify that the vector and scalar meson spectra obtained by the gravity dual with a black hole for all temperatures (small and large) are nearly isospectral with the spectra obtained by a thermal gravity dual valid for only low temperatures; the isospectrality is much closer for vector mesons than scalar mesons. The black hole gravity dual (with a horizon radius smaller than the deconfinement scale) also provides the expected large-$N$ suppressed decrease in vector meson mass with an increase of temperature.

    ↳ hep-thhep-phnucl-thEPJC(2017)·18 citations
28. 28*

    One-loop QCD thermodynamics in a strong homogeneous and static magnetic field

    Shubhalaxmi Rath🇮🇳 · Binoy Krishna Patra🇮🇳

    We have studied how the equation of state of thermal QCD with two light flavours is modified in strong magnetic field by calculating the thermodynamic observables of hot QCD matter up to one-loop, where the magnetic field affects mainly the quark contribution and the gluonic part is largely unaffected except for the softening of the screening mass due to the strong magnetic field. To begin with the effect of magnetic field on the thermodynamics, we have first calculated the pressure of a thermal QCD medium in strong magnetic field limit (SML), where the pressure at fixed temperature increases with the magnetic field faster than the increase with the temperature at constant magnetic field. This can be envisaged from the dominant scale of thermal medium in SML, which is the magnetic field, like the temperature in thermal medium in absence of strong magnetic field. Thus although the presence of strong magnetic field makes the pressure of hot QCD medium harder but the increase of pressure with respect to the temperature becomes less steeper. Corroborated to the above observations, the entropy density is found to decrease with the temperature in the ambience of strong magnetic field which resonates with the fact that the strong magnetic field restricts the dynamics of quarks in two dimensions, hence the phase space gets squeezed resulting the reduction of number of microstates. Moreover the energy density is seen to decrease and the speed of sound of thermal QCD medium is increased in the presence of strong magnetic field. These crucial findings in strong magnetic field could have phenomenological implications in heavy ion collisions because the expansion dynamics of the medium produced in noncentral ultrarelativistic heavy ion collisions is effectively controlled by both the energy density and the speed of sound.

    ↳ hep-thhep-phnucl-thJHEP(2017)·62 citations
29. 29*

    Stiff self-interacting string near QCD deconfinement point

    A. Bakry🇨🇳 · X. Chen🇨🇳 · M. Deliyergiyev🇨🇳 · S. Xu🇨🇳 · P.M. Zhang🇨🇳 · A. Galal🇨🇳 · A. Khalaf🇪🇬

    We compare the predictions of Nambu-Goto effective string model at two loop-order for the Casimir energy and the width of the quantum delocalization of the string to the corresponding quark-antiquark potential and width profile of the color tube in pure SU (3) Yang-Mills LGT at 4-dimensions near the deconfinement point. Minor effects are returned, when considering NLO terms for both the $Q\bar{Q}$ potential and broadening of the color tube, at the temperature $T/T_c=0.8$. At a closer temperature to the critical point $T/T_c$= 0.9, we found that the NLO contributions, from the expansion of the Nambu-Goto string, to have a significant effect in improving the match to lattice data in the intermediate distances scales. The string's self-interactions contribute towards the suppressed broadening of the string's width and the squeezed profile along the string at the intermediate color source separation distance.

    ↳ hep-lathep-ph6 citations
30. 30*

    The 3.5 keV Line from Stringy Axions

    Michele Cicoli🇮🇹 · Victor A. Diaz🇮🇹 · Veronica Guidetti🇮🇹 · Markus Rummel🇨🇦

    An interesting result in particle astrophysics is the recent detection of an unexplained 3.5 keV line from galaxy clusters. A promising model, which can explain the morphology of the signal and its non-observation in dwarf spheroidal galaxies, involves a 7 keV dark matter particle decaying into a pair of ultra-light axions that convert into photons in the magnetic field of the clusters. Given that light axions emerge naturally in 4D string vacua, in this paper we present a microscopic realisation of this model within the framework of type IIB flux compactifications. Dark matter is a local closed string axion which develops a tiny mass due to subdominant poly-instanton corrections to the superpotential and couples via kinetic mixing to an almost massless open string axion living on a D3-brane at a singularity. The interaction of this ultra-light axion with photons is induced by U(1) kinetic mixing. After describing the Calabi-Yau geometry and the brane set-up, we discuss in depth moduli stabilisation, the resulting mass spectrum and the strength of all relevant couplings.

    ↳ hep-thastro-ph.HEhep-phJHEP(2017)·18 citations
31. 31*

    Vision and Outlook: The Future of Particle Physics

    Ian Shipsey🇬🇧

    As a community, our goal is to understand the fundamental nature of energy, matter, space, and time, and to apply that knowledge to understand the birth, evolution and fate of the universe. Our scope is broad and we use many tools: accelerator, non-accelerator & cosmological observations, all have a critical role to play. The progress we have made towards our goal, the tools we need to progress further, the opportunities we have for achieving transformational paradigm-altering scientific advances: great discoveries, and the importance of being a united global field to make progress toward our goal are the topics of this talk.

    ↳ hep-exhep-ph5 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.