Wed·Feb 21, 2018Wednesday·February 21, 2018

1. 01*

   The distribution of inelastic dark matter in the Sun

   Mattias Blennow🇪🇸 · Stefan Clementz🇸🇪 · Juan Herrero-Garcia🇦🇺

   If dark matter is composed of new particles, these may become captured after scattering with nuclei in the Sun, thermalise through additional scattering, and finally annihilate into neutrinos that can be detected on Earth. If dark matter scatters inelastically into a slightly heavier ($\mathcal{O}(10-100)$ keV) state it is unclear whether thermalisation occurs. One issue is that up-scattering from the lower mass state may be kinematically forbidden, at which point the thermalisation process effectively stops. A larger evaporation rate is also expected due to down-scattering. In this work, we perform a numerical simulation of the capture and thermalisation process in order to study the evolution of the dark matter distribution. We then calculate and compare the annihilation rate with that of the often assumed Maxwell--Boltzmann distribution. We also check if equilibrium between capture and annihilation is reached and find that this assumption definitely breaks down in a part of the explored parameter space. We also find that evaporation induced by down-scattering is not effective in reducing the total dark matter abundance.

   hep-phastro-ph.HEEPJC(2018)·22 citations
2. 02*

   Constraining Dark Matter Models with a Light Mediator from PandaX-II Experiment

   Xiangxiang Ren🇨🇳 · Li Zhao🇨🇳 · Abdusalam Abdukerim🇨🇳 · Xun Chen🇨🇳 · Yunhua Chen🇨🇳 · Xiangyi Cui🇨🇳 · Deqing Fang🇨🇳 · Changbo Fu🇨🇳 · Karl Giboni🇨🇳 · Franco Giuliani🇨🇳 · Linhui Gu🇨🇳 · Xuyuan Guo🇨🇳 and 35 other authors

   We search for nuclear recoil signals of dark matter models with a light mediator in PandaX-II, a direct detection experiment in China Jinping underground Laboratory. Using data collected in 2016 and 2017 runs, corresponding to a total exposure of 54 ton day, we set upper limits on the zero-momentum dark matter-nucleon cross section. These limits have a strong dependence on the mediator mass when it is comparable to or below the typical momentum transfer. We apply our results to constrain self-interacting dark matter models with a light mediator mixing with standard model particles, and set strong limits on the model parameter space for the dark matter mass ranging from $5\mathrm{GeV}$ to $10\mathrm{TeV}$.

   hep-phhep-exPRL(2018)·93 citations
3. 03*

   On the evolution process of two-component dark matter in the Sun

   Chian-Shu Chen🇹🇼 · Yen-Hsun Lin🇹🇼

   We introduce dark matter (DM) evolution process in the Sun under a two-component DM (2DM) scenario. Both DM species $\chi$ and $\xi$ with masses heavier than 1 GeV are considered. In this picture, both species could be captured by the Sun through DM-nucleus scattering and DM self-scatterings, e.g. $\chi \chi$ and $\xi \xi$ collisions. In addition, the heterogeneous self-scattering due to $\chi$ and $\xi$ collision is essentially possible in any 2DM models. This new introduced scattering naturally weaves the evolution processes of the two DM species that was assumed to evolve independently. Moreover, the heterogeneous self-scattering enhances the number of DM being captured in the Sun mutually. This effect significantly exists in a broad range of DM mass spectrum. We have studied this phenomena and its implication for the solar-captured DM annihilation rate. It would be crucial to the DM indirect detection when the two masses are close. General formalism of the 2DM evolution in the Sun as well as its kinematics are studied.

   hep-phJHEP(2018)·3 citations
4. 04*

   Low-virtuality leptoproduction of open-charm as a probe of the gluon Sivers function

   Rohini M. Godbole🇮🇳 · Abhiram Kaushik🇮🇳 · Anuradha Misra🇮🇳

   We propose low-virtuality leptoproduction of open-charm, $p^{\uparrow }l\to D^0+X$, as a probe of the gluon Sivers function (GSF). At leading-order, this process directly probes the gluon content of the proton, making detection of a trasverse single-spin asymmetry in the process a clear indication of a non-zero GSF. Considering the kinematics of the proposed future Electron-Ion Collider (EIC), we present predictions for asymmetry using fits of the GSF available in literature. We also study the asymmetry at the level of muons produced in D-meson decays and find that the asymmetry is preserved therein as well.

   hep-phFew Body Syst.(2018)·0 citations
5. 05*

   Multiplicity distribution and normalized moments in p$-$p collisions at LHC in forward rapidity using Weibull model

   Ranjit Nayak🇮🇳 · Sadhana Dash🇮🇳

   The measured charged particle multiplicity distribution in the forward rapidity region of the p$-$p collisions at $\sqrt{s}$ = 0.9 TeV, 7 TeV and 8 TeV at the LHC have been described using the Weibull distribution function. The higher order (up to $5^{th}$ order ) normalized moments and the factorial moments are also calculated using the extracted parameters. The multiplicity distributions in forward region are observed to be well described by the Weibull regularity and the higher order moment calculations confirm the violation of KNO scaling that has been observed at mid-rapidity and lower energies. The Weibull parameters and moments for p$-$p collisions at $\sqrt{s}$ = 13 TeV are also estimated for the forward region.

   hep-phnucl-thJ.Phys.G(2019)·4 citations
6. 06*

   Search for vector charmonium(-like) states in the $e^{+}{e}^{-}\to \eta J/\psi$ line shape

   Jielei Zhang🇨🇳 · Rumin Wang🇨🇳

   The cross section of $e^{+}{e}^{-}\to \eta J/\psi$ has been measured by BESIII and Belle experiments. Fit to the $e^{+}{e}^{-}\to \eta J/\psi$ line shape, three resonant structures are evident. The parameters for the three resonant structures are $M_1=(3980\pm 17\pm 7)$ MeV/$c^2$, ${\Gamma }_1=(104\pm 32\pm 13)$ MeV; $M_2=(4219\pm 5\pm 4)$ MeV/$c^2$, ${\Gamma }_2=(63\pm 9\pm 3)$ MeV; $M_3=(4401\pm 12\pm 4)$ MeV/$c^2$, ${\Gamma }_3=(49\pm 19\pm 4)$ MeV, where the first uncertainties are statistical and the second systematic. We attribute the three structures to $\psi (4040)$, $Y(4220)$ and $\psi (4415)$ states. The branching fractions $\mathcal{B}(\psi (4040)\to \eta J/\psi )$ and $\mathcal{B}(\psi (4415)\to \eta J/\psi )$ are given. If $Y(4220)$ is taken as $\psi (4S)$ state, the branching fraction $\mathcal{B}(\psi (4S)\to \eta J/\psi )$ is also given. Combining all $Y(4220)$ parameters obtained from different decays, we give average parameters for $Y(4220)$, which are $M_{Y(4220)}=(4220.8\pm 2.4)$ MeV/$c^2$, ${\Gamma }_{Y(4220)}=(54.8\pm 3.3)$ MeV.

   hep-phAdv.High Energy Phys.(2018)·2 citations
7. 07*

   $B$ decay anomalies and dark matter from strong dynamics

   James M. Cline🇨🇦

   Indications of lepton flavor universality violation in semileptonic $B$ decays to $K$ or $K^{\ast }$ and muons or electrons can be explained by leptoquark exchange. I present a model in which the leptoquark is a bound state of constituents charged under a new confining SU($N_{\mathrm{HC}}$) hypercolor interaction. The lightest neutral bound state in the theory is an asymmetric dark matter candidate, that might be directly detectable through its magnetic dipole moment interaction.

   hep-phFrascati Phys.Ser.(2017)·0 citations
8. 08*

   Soft-photon corrections to the Bethe-Heitler process in the $\gamma p\to l^{+}{l}^{-}p$ reaction

   Matthias Heller🇩🇪 · Oleksandr Tomalak🇩🇪 · Marc Vanderhaeghen🇩🇪

   We report on the calculation of first-order QED corrections for the $\gamma p\to l^{+}{l}^{-}{p}^{\prime }$ process. An upcoming experiment at MAMI (Mainz) aims to compare the cross sections of muon- and electron-pair production in this reaction to test lepton universality. Precise knowledge of the electromagnetic radiative corrections is needed for these measurements. As a first step, we present the leading QED radiative corrections in the soft-photon approximation when accounting for the finite lepton mass. For the kinematics at MAMI, we find corrections of the percent level for muons, and of order $10\%$ for electrons.

   hep-phnucl-exnucl-thPRD(2018)·15 citations
9. 09*

   Interpreting top-quark LHC measurements in the standard-model effective field theory

   J. A. Aguilar Saavedra🇪🇸 · C. Degrande🇨🇭 · G. Durieux🇩🇪 · F. Maltoni🇧🇪 · E. Vryonidou🇨🇭 · C. Zhang (editors)🇨🇳 · D. Barducci🇮🇹 · I. Brivio🇩🇰 · V. Cirigliano🇺🇸 · W. Dekens🇺🇸 · J. de Vries🇳🇱 · C. Englert🇬🇧 and 23 other authors

   This note proposes common standards and prescriptions for the effective-field-theory interpretation of top-quark measurements at the LHC.

   hep-phhep-ex361 citations
10. 10*

    Three Dimensional Imaging of the Nucleon

    Jai More🇮🇳 · Asmita Mukherjee🇮🇳 · Sreeraj Nair🇮🇳

    We study the Wigner distributions of quarks and gluons in light-front dressed quark model using the overlap of light front wave functions (LFWFs). We take the target to be a dressed quark, this is a composite spin $-1/2$ state of quark dressed with a gluon. This state allows us to calculate the quark and gluon Wigner distributions analytically in terms of LFWFs using Hamiltonian perturbation theory. We analyze numerically the Wigner distributions of quark and gluon and report their nature in the contour plots. We use an improved numerical technique to remove the cutoff dependence of the Fourier transformed integral over ${\mathbf{\Delta }}_{\perp }$.

    hep-phFew Body Syst.(2018)·1 citation
11. 11*

    Late-time magnetogenesis driven by ALP dark matter and dark photon

    Kiwoon Choi🇰🇷 · Hyungjin Kim🇮🇱 · Toyokazu Sekiguchi🇰🇷

    We propose a mechanism generating primordial magnetic fields after the $e^{+}{e}^{-}$ annihilations. Our mechanism involves an ultra-light axion-like particle (ALP) which constitutes the dark matter, and a dark $U(1{)}_X$ gauge boson introduced to bypass the obstacle placed by the conductivity of cosmic plasma. In our scheme, a coherently oscillating ALP amplifies the dark photon field, and part of the amplified dark photon field is concurrently converted to the ordinary magnetic field through the ALP-induced magnetic mixing. For the relevant ALP mass range $10^{-21}\mathrm{eV}\lesssim m_{\varphi }\lesssim 10^{-17}\mathrm{eV}$, our mechanism can generate $B\sim 10^{-24}\mathrm{G}(m_{\varphi }/10^{-17}\mathrm{eV}{)}^{5/4}$ with a coherent length $\lambda \sim (m_{\varphi }/10^{-17}\mathrm{eV}{)}^{-1/2}$ kpc, which is large enough to provide a seed of the galactic magnetic fields. The mechanism also predicts a dark $U(1{)}_X$ electromagnetic field $E_X\sim B_X\sim 80\mathrm{nG}(m_{\varphi }/10^{-17}\mathrm{eV}{)}^{-1/4}$, which can result in interesting astrophysical/cosmological phenomena by inducing the mixings between the ALP, ordinary photon, and dark photon states.

    hep-phastro-ph.COPRL(2018)·31 citations
12. 12*

    Axion interferometry

    William DeRocco🇺🇸 · Anson Hook🇺🇸

    We propose using interferometry of circularly polarized light as a mechanism by which to test for axion dark matter. These interferometers differ from standard interferometers only by the addition of a few quarter waveplates to preserve the polarization of light upon reflection. We show that using current technology, interferometers can probe new regions of axion parameter space up to a couple orders of magnitude beyond current constraints.

    hep-phPRD(2018)·121 citations
13. 13*

    Gauge Invariant Noether's Theorem in Yang-Mills Theory

    Gouranga C Nayak🇺🇸

    The gauge invariant definition of the spin dependent gluon distribution function from first principle is necessary to study the proton spin crisis at high energy colliders. In this paper we derive the gauge invariant Noether's theorem in Yang-Mills theory by using combined Lorentz transformation plus local non-abelian gauge transformation. We find that the definition of the gauge invariant spin (or orbital) angular momentum of the Yang-Mills field does not exist in Yang-Mills theory although the definition of the gauge invariant spin (or orbital) angular momentum of the quark exists. We show that the gauge invariant definition of the spin angular momentum of the Yang-Mills field in the literature is not correct because of the non-vanishing boundary surface term in Yang-Mills theory. We also find that the Belinfante-Rosenfeld tensor in Yang-Mills theory is not required to obtain the symmetric and gauge invariant energy-momentum tensor of the quark and the Yang-Mills field.

    hep-phnucl-th12 citations
14. 14*

    BFKL Spectrum of N=4 SYM: non-Zero Conformal Spin

    Mikhail Alfimov🇫🇷 · Nikolay Gromov🇬🇧 · Grigory Sizov🇫🇷

    We developed a general non-perturbative framework for the BFKL spectrum of planar N=4 SYM, based on the Quantum Spectral Curve (QSC). It allows one to study the spectrum in the whole generality, extending previously known methods to arbitrary values of conformal spin $n$. We show how to apply our approach to reproduce all known perturbative results for the Balitsky-Fadin-Kuraev-Lipatov (BFKL) Pomeron eigenvalue and get new predictions. In particular, we re-derived the Faddeev-Korchemsky Baxter equation for the Lipatov spin chain with non-zero conformal spin reproducing the corresponding BFKL kernel eigenvalue. We also get new non-perturbative analytic results for the Pomeron eigenvalue in the vicinity of $|n|=1,\Delta =0$ point and we obtained an explicit formula for the BFKL intercept function for arbitrary conformal spin up to the 3-loop order in the small coupling expansion and partial result at the 4-loop order. In addition, we implemented the numerical algorithm of arXiv:1504.06640 as an auxiliary file to this arXiv submission. From the numerical result we managed to deduce an analytic formula for the strong coupling expansion of the intercept function for arbitrary conformal spin.

    ↳ hep-thhep-phmath-phmath.MP+1JHEP(2018)·45 citations
15. 15*

    Perturbative unitarity and higher-order Lorentz symmetry breaking

    Leonardo Balart🇨🇱 · Carlos M. Reyes🇨🇱 · Sebastian Ossandon🇨🇱 · Camilo Reyes🇨🇱

    We study perturbative unitarity in the scalar sector of the Myers-Pospelov model. The model introduces a preferred four-vector $n$ which breaks Lorentz symmetry and couples to a five-dimension operator. When the preferred four-vector is chosen in the pure timelike or lightlike direction, the model becomes a higher time derivative theory, leading to a cubic dispersion relation. Two of the poles are shown to be perturbatively connected to the standard ones, while a third pole, which we call the Lee-Wick-like pole, is associated to a negative metric, in Hilbert space, threatening the preservation of unitarity. The pure spacelike case is a normal theory in the sense that it has only two solutions both being small perturbations over the standard ones. We analyze perturbative unitarity for purely spacelike and timelike cases using the optical theorem and considering a quartic self-interaction term. By computing discontinuities in the loop diagram, we arrive at a pinching condition which determines the propagation of particles and Lee-Wick-like particles through the cut. We find that the contribution for Lee-Wick-like particles vanishes for any external momenta, leaving only the contribution of particles, thus preserving one-loop unitarity in both cases.

    ↳ hep-thhep-phPRD(2018)·9 citations
16. 16*

    First-order derivative of cluster size as a new signature of phase transition in heavy ion collisions at intermediate energies

    P. Das🇮🇳 · S. Mallik🇮🇳 · G. Chaudhuri🇮🇳

    The phenomenon of liquid-gas phase transition occurring in heavy ion collisions at intermediate energies is a subject of contemporary interest. Phase transition is usually characterized by the specific behaviour of state variables like pressure, density, energy etc. In heavy ion collisions there is no direct way of accessing these state variables and hence unambiguous detection of phase transition becomes difficult. This work establishes that signatures of phase transition can be extracted from the observables which are easily accessible in experiments and these have similar behaviour as the state variables. The temperature dependence of the first order derivative of the order parameters related to the largest and second largest cluster size (produced in heavy ion collisions) exhibit similar behavior as that of the variation of specific heat at constant volume Cv which is an established signature of first order phase transition. This motivates us to propose these derivatives as confirmatory signals of liquid-gas phase transition. The measurement of these signals in easily feasible in most experiments as compared to the other signatures like specific heat, caloric curve or bimodality. This temperature where the peak appears is designated to be the transition temperature and the effect of certain parameters on this has also been examined.

    ↳ nucl-thhep-phPLB(2018)·12 citations
17. 17*

    Production of $N^{\ast }(1535)$ and $N^{\ast }(1650)$ in ${\Lambda }_c\to {\bar{K}}^0\eta p$ $(\pi N)$ decay

    R. Pavao🇪🇸 · S. Sakai🇪🇸 · E. Oset🇪🇸

    In order to study the properties of the $N^{\ast }$(1535) and $N^{\ast }$(1650) we calculate the mass distributions of $MB$ in the ${\Lambda }_c\to {\bar{K}}^{0}MB$ decay, with $MB=\pi N(I=1/2),\eta p$ and $K\Sigma (I=1/2)$. We do this by calculating the tree-level and loop contributions, mixing pseudoscalar-baryon and vector-baryon channels using the local hidden gauge formalism. The loop contributions for each channel are calculated using the chiral unitary approach. We observe that for the $\eta N$ mass distribution only the $N^{\ast }$(1535) is seen, with the $N^{\ast }$(1650) contributing to the width of the curve, but for the $\pi N$ mass distribution both resonances are clearly visible. In the case of $MB=K\Sigma$, we found that the strength of the $K\Sigma$ mass distribution is smaller than that of the mass distributions of the $\pi N$ and $\eta p$ in the ${\Lambda }_c^{+}\to {\bar{K}}^0\pi N$ and ${\Lambda }_c^{+}\to {\bar{K}}^0\eta p$ processes, in spite of this channel having a large coupling to the $N^{\ast }(1650)$. This is because the $K\Sigma$ pair production is suppressed in the primary production from the ${\Lambda }_c$ decay.

    ↳ nucl-thhep-phPRC(2018)·18 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.