Fri·Jan 12, 2018Friday·January 12, 2018

1. 01*

   KKMC-hh: A Precision Event Generator for EW Radiative Corrections in Hadron Scattering

   S.A. Yost🇺🇸 · S. Jadach🇵🇱 · B.F.L. Ward🇺🇸 · Z. Was🇵🇱

   KKMC-hh is a precision event-generator for Z production and decay in hadronic collisions, which applies amplitude-level exponentiation to both initial and final state photon radiation, including perturbative residuals through order ${\alpha }^{2}L$, together with electroweak matrix element corrections. We present results showing the effect of multi-photon radiation for cuts motivated by a recent ATLAS W-mass analysis. We also show preliminary untuned comparisons of the electroweak corrections of KKMC-hh to those of HORACE, which includes order $\alpha$ corrections with exponentiated final-state photon radiation.

   hep-phPoS(2018)·3 citations
2. 02*

   Exploring the ${\rm Y}(4S,5S,6S)\to h_b(1P)\eta$ hidden-bottom hadronic transitions

   Yawei Zhang🇨🇳 · Gang Li🇨🇳

   Recently, Belle Collaboration has reported the measurement of the spin-flipping transition ${\rm Y}(4S)\to h_b(1P)\eta$ with an unexpectedly large branching ratio: $\mathcal{B}({\rm Y}(4S)\to h_b(1P)\eta )=(2.18\pm 0.11\pm 0.18)\times 10^{-3}$. Such a large branching fraction contradicts with the anticipated suppression for the spin flip. In this work, we examine the effects induced by intermediate bottomed meson loops and point out that these effects are significantly important. Using the effective Lagrangian approach (ELA), we find the experimental data on ${\rm Y}(4S)\to h_b(1P)\eta$ can be accommodated with the reasonable inputs. We then explore the decays ${\rm Y}(5S,6S)\to h_b(1P)\eta$ and find that these two channels also have sizable branching fractions. We also calculate these these processes in the framework of nonrelativistic effective field theory (NREFT). For the decays ${\rm Y}(4S)\to h_b(1P)\eta$, the NREFT results are at the same order of magnitude but smaller than the ELA results by a factor of $2$ to $5$. For the decays ${\rm Y}(5S,6S)\to h_b(1P)\eta$ the NREFT results are smaller than the ELA results by approximately one order of magnitude. We suggest future experiment Belle-II to search for the ${\rm Y}(5S,6S)\to h_b(1P)\eta$ decays which will be helpful to understand the transition mechanism.

   hep-phhep-exPRD(2018)·13 citations
3. 03*

   Strong and radiative decays of D\Xi molecular state and newly observed ${\Omega }_c$ states

   Yin Huang🇨🇳 · Cheng-jian Xiao🇨🇳 · Qi Fang Lü🇨🇳 · Rong Wang🇫🇷 · Jun He🇨🇳 · Lisheng Geng🇨🇳

   In this work, we study strong and radiative decays of S-wave D\Xi molecular state, which is related to the \Omega^*_c states newly observed at LHCb. The coupling between the D\Xi molecular state and its constituents D and \Xi is calculated by using the compositeness condition. With the obtained coupling, the partial decay widths of the D\Xi molecular state into the \Xi_c^{+}K^{-}, \Xi^{'+}_cK^{-} and \Omega^{*}_c(2695)\gamma final states through hadronic loop are calculated with the help of the effective Lagrangians. By comparison with the LHCb observation, the current results of total decay width support the \Omega^{*}_c(3119) or \Omega^{*}_c(3050) as D\Xi molecule while the the decay width of the \Omega^{*}_c(3000), \Omega^{*}_c(3066) and \Omega^{*}_c(3090) can not be well reproduced in the molecular state picture. The partial decay widths are also presented and helpful to further understand the internal structures of \Omega^{*}_c(3119) and \Omega^{*}_c(3050).

   hep-phnucl-thPRD(2018)·51 citations
4. 04*

   Search for sterile neutrinos decaying into pions at the LHC

   Claudio O. Dib🇨🇱 · C.S. Kim🇰🇷 · Nicolas A. Neill🇨🇱 · Xing-Bo Yuan🇹🇼

   We study the possibility to observe sterile neutrinos with masses in the range between 5 GeV and 20 GeV at the LHC, using the exclusive semileptonic modes involving pions, namely W to lepton + N to n pions + lepton+lepton (n = 1, 2, 3). The two pion and three pion modes require extrapolations of form factors to large time-like $q^2$, which we do using vector dominance models as well as light front holographic QCD, with remarkable agreement. This mass region is difficult to explore with inclusive dilepton+dijet modes or trilepton modes and impossible to explore in rare meson decays. While particle identification is a real challenge in these modes, vertex displacement due to the long living neutrino in the above mass range can greatly help reduce backgrounds. Assuming a sample of $10^9$ W bosons at the end of the LHC Run 2, these modes could discover a sterile neutrino in the above mass range or improve the current bounds on the heavy-to-light lepton mixings by an order of magnitude, $U_{lN}^2\sim 2\times 10^{-6}$. Moreover, by studying the equal sign and opposite sign dileptons, the Majorana or Dirac character of the sterile neutrino may be revealed.

   hep-phPRD(2018)·26 citations
5. 05*

   Longitudinal structure function from logarithmic slopes of $F_2$ at low $x$

   G.R.Boroun🇮🇷

   Using Laplace transform techniques, I calculate the longitudinal structure function $F_L(x,Q^2)$ from the scaling violations of the proton structure function $F_2(x,Q^2)$, and make a critical study of this relationship between the structure functions at leading order (LO) up to next-to-next-to leading order (NNLO) analysis at small $x$. Furthermore, I consider heavy quark contributions to the relation between the structure functions, which leads to compact formula for $N_f=3+\mathrm{Heavy}$. The nonlinear corrections to the longitudinal structure function at LO up to NNLO analysis are shown in the $N_f=4$ (light quark flavor) based on the nonlinear corrections at $R=2$ and $R=4Ge{V}^{-1}$. The results are compared to experimental data of the longitudinal proton structure function $F_L$ in the range of $6.5\le Q^2\le 800Ge{V}^2$.

   hep-phPRC(2018)·25 citations
6. 06*

   Spontaneous magnetization under a pseudovector interaction between quarks in high density quark matter

   M.Morimoto (Kochi Univ., Japan)🇯🇵 · Y.Tsue (Kochi Univ., Japan)🇯🇵 · J.da Providencia (Univ.de Coimbra, Portugal)🇵🇹 · C. Providencia (Univ.de Coimbra, Portugal)🇵🇹 · M.Yamamura (Kansai Univ., Japan)🇯🇵

   Spontaneous magnetization and magnetic susceptibility originated from the pseudovector-type four-point interaction between quarks are calculated in quark matter with zero temperature and finite quark chemical potential by using the two-flavor Nambu-Jona-Lasinio model. It is shown that both the chiral condensate and spin polarized condensate coexist in a narrow region of the quark chemical potential. And then, it is also shown that, in this narrow region, the spontaneous magnetization appears. Also, the magnetic susceptibility due to quarks with the positive energy is evaluated in the spin polarized phase.

   hep-phnucl-thIJMPE(2018)·12 citations
7. 07*

   The 3D entangled structure of the proton; transverse degrees of freedom in QCD, momenta, spins and more

   P.J. Mulders🇳🇱

   Light-front quantized quark and gluon states (partons) play a dominant role in high energy scattering processes. Initial state hadrons are mixed ensembles of partons, while produced pure partonic states appear as mixed ensembles of hadrons. The transition from collinear hard physics to the 3D structure including partonic transverse momenta is related to confinement which links color and spatial degrees of freedom. We outline ideas on emergent symmetries in the Standard Model and their connection to the 3D structure of hadrons. Wilson loops, including those with light-like Wilson lines such as used in the studies of transverse momentum dependent distribution functions (TMDs) may play a crucial role here, establishing a direct link between transverse spatial degrees of freedom and gluonic degrees of freedom.

   hep-phFew Body Syst.(2018)·4 citations
8. 08*

   b decays: a factory for hidden charm multiquark states

   Franco Buccella🇮🇹

   We assume that the two hidden charm pentaquark discovered at $LHCb$ are built by the three light quarks and the $c\bar{c}$ pair, both colour octets. in relative P-wave for the ${\frac{5}{2}}^{+}$ state and by the eigenvectors of the chromomagnetic interaction for the five constituents in S-wave for the four ${\frac{3}{2}}^{-}$ state with masses $4360$, $4410$, $4490$ and $4560$ MeV . The "open channel" $p$ $J/\psi$ has large components along the two first states and so appear as the $4380$ resonance and the ${\Lambda }_c$ ${\bar{D}}^{0\ast }$ and ${\Sigma }_c$ ${\bar{D}}^{\ast }$ are "open channels" for the lower and higher resonances, respectively. The expectation for their strange isoscalar partners is to have a mass larger by an amount of the order or smaller than the $M_{\Lambda }-M_N$ mass difference. We account for the small width of the ${\frac{5}{2}}^{+}$, since its decay needs the exchangeof a gluon and stress that the decays of particles with "beauty" provide the best experimental framework for the discovery of hidden charm multiquarks. The relevance of the production mechanics shows the reason why only some of the states with non minimal number of constituents have been found.

   hep-phPRD(2018)·5 citations
9. 09*

   A new method for one-loop amplitude generation and reduction in OpenLoops

   Federico Buccioni🇨🇭 · Stefano Pozzorini🇨🇭 · Max Zoller🇨🇭

   We describe a new method for the automated construction of one-loop amplitudes based on the open-loop algorithm, where various operations are performed on-the-fly while constructing the integrand. In particular, an on-the-fly reduction interleaved with the construction steps of the amplitude keeps the maximum tensor rank in the loop momentum at two throughout the algorithm, thus drastically reducing the complexity of the calculation. The full reduction to scalar integrals is unified with the amplitude construction in a single recursion within the OpenLoops framework. This approach strongly exploits the factorisation of one-loop integrands in a product of loop segments. The on-the-fly approach, which is also applied to helicity summation and the merging of different diagrams, increases the speed of the original open-loop algorithm in a very significant way. A remarkably high level of numerical stability is achieved by exploiting freedoms in reduction identities and through simple expansions in rank-two Gram determinants. These features are particularly attractive for NLO multi-leg and NNLO real-virtual calculations. The new algorithm will be made public in a forthcoming release of the OpenLoops program.

   hep-phPoS(2017)·4 citations
10. 10*

    Computer modeling of properties of Kaluza-Klein particles and their searches at the LHC

    T.V. Obikhod🇺🇦 · I.A. Petrenko🇺🇦

    The Standard Model problems lead to the new theories of extra dimensions: Randall-Sundrum model, Arkani-Hamed-Dimopoulos-Dvali model and TeV${}^{-1}$ model. In the framework of these models with the help of computer program Pythia8.2 were calculated the production cross sections for Kaluza-Klein particles at various energies at the LHC. The generation of monojet events from scalar graviton emission was considered for number of extra dimensions, n=2, 4, 6, for the energy at the LHC 14 TeV. Also are studied the graviton production processes through the gluon-gluon, quark-gluon and quark-quark fusion processes and found some periodicity in the behavior of the graviton mass spectrum. Within Randall-Sundrum scenario were calculated $\sigma \times$ Br for production process of massive graviton, gg $\to$ $G^{\ast }$, and the most probable processes of graviton decay at 13 TeV, 14 TeV and 100 TeV.

    hep-phAdv.High Energy Phys.(2018)·1 citation
11. 11*

    Is There a Hollow Inside the Proton?

    V. A. Petrov🇷🇺 · A. P. Samokhin🇷🇺

    We discuss a recently proposed interpretation of some model descriptions of the proton-proton elastic scattering data as a manifestation of alleged relative transparency of the central part of the interaction region in the impact parameter space. We argue that the presence of nonzero real part of the elastic scattering amplitude in the unitarity condition enables to conserve the traditional interpretation.

    hep-phhep-exInt.J.Mod.Phys.Conf.Ser.(2018)·16 citations
12. 12*

    Heavy quark state production and suppression via Xe-Xe collisions at $\sqrt{s_{pp}}$=5.44 TeV

    Leonard S. Kisslinger🇺🇸 · Debasish Das🇮🇳

    We estimate differential rapidity cross sections for $J/\Psi$, $\Psi (2S)$, ${\rm Y}(1S)$, ${\rm Y}(2S)$, and ${\rm Y}(3S)$ production; and $\Psi (2S)$ to $J/\Psi (1S)$, ${\rm Y}(3S)$ to ${\rm Y}(1S)$ suppression via Xe-Xe collisions at proton-proton energy $\equiv \sqrt{s_{pp}}$ =5.44 TeV. For the $\Psi (2S)$, ${\rm Y}(3S)$ states we use the mixed heavy quark hybrid theory, with these states being approximately 50\% standard and 50\% hybrid charmonium, bottomonium meson states.

    hep-ph1 citation
13. 13*

    Top compositeness, Flavor and Naturalness

    Giuliano Panico🇪🇸

    We discuss the connection between the top quark, naturalness and flavor in composite Higgs models. The phenomenological features of the top quark and the associated fermionic partners are presented. The main realizations of the flavor structure, in particular the anarchic partial compositeness scenario and its possible modifications, are also briefly reviewed.

    hep-ph2 citations
14. 14*

    Central exclusive diffractive production of $p\bar{p}$ pairs in proton-proton collisions at high energies

    Piotr Lebiedowicz🇵🇱 · Otto Nachtmann🇩🇪 · Antoni Szczurek🇵🇱

    We consider the central exclusive production of the $p\bar{p}$ in the continuum and via resonances in proton-proton collisions at high energies. We discuss the diffractive mechanism calculated within the tensor-pomeron approach including pomeron, odderon, and reggeon exchanges. The theoretical results are discussed in the context of existing WA102 and ISR experimental data and predictions for planned or current experiments at the RHIC and the LHC are presented. The distribution in ${\mathrm{y}}_{diff}$, the rapidity distance between proton and antiproton, is particularly interesting. We find a dip at ${\mathrm{y}}_{diff}=0$ for the $p\bar{p}$ production, in contrast to the ${\pi }^{+}{\pi }^{-}$ and $K^{+}{K}^{-}$ production. We predict also the $p\bar{p}$ invariant mass distribution to be less steep than for the pairs of pseudoscalar mesons. We argue that these specific differences for the $p\bar{p}$ production with respect to the pseudoscalar meson pair production can be attributed to the proper treatment of the spin of produced particles. We discuss asymmetries that are due to the interference of $C=+1$ and $C=-1$ amplitudes of $p\bar{p}$ production. We have also calculated the cross section for the $pp\to pp\Lambda \overline{\Lambda }$ reaction. Here, the cross section is smaller but the characteristic feature for $d\sigma /d{\mathrm{y}}_{diff}$ is predicted to be similar to $p\bar{p}$ production. The presence of resonances in the $p\bar{p}$ channel may destroy the dip at ${\mathrm{y}}_{diff}=0$. This opens the possibility to study diffractively produced resonances. We discuss the observables suited for this purpose.

    hep-phPRD(2018)·32 citations
15. 15*

    Factorization Theorem Relating Euclidean and Light-Cone Parton Distributions

    Taku Izubuchi🇺🇸 · Xiangdong Ji🇨🇳 · Luchang Jin🇺🇸 · Iain W. Stewart🇺🇸 · Yong Zhao🇺🇸

    In a large-momentum nucleon state, the matrix element of a gauge-invariant Euclidean Wilson line operator accessible from lattice QCD can be related to the standard light-cone parton distribution function through the large-momentum effective theory (LaMET) expansion. This relation is given by a factorization theorem with a non-trivial matching coefficient. Using the operator product expansion we prove the large-momentum factorization of the quasi-parton distribution function in LaMET, and show that the more recently discussed Ioffe-time distribution approach also obeys an equivalent factorization theorem. Explicit results for the coefficients are obtained and compared at one-loop. Our proof clearly demonstrates that the matching coefficients in the $\overline{\mathrm{MS}}$ scheme depend on the large partonic momentum rather than the nucleon momentum.

    hep-phhep-latnucl-thPRD(2018)·239 citations
16. 16*

    Axionic Landscape for Higgs Near-Criticality

    James M. Cline🇨🇦 · José R. Espinosa🇪🇸

    The measured value of the Higgs quartic coupling $\lambda$ is peculiarly close to the critical value above which the Higgs potential becomes unstable, when extrapolated to high scales by renormalization group running. It is tempting to speculate that there is an anthropic reason behind this near-criticality. We show how an axionic field can provide a landscape of vacuum states in which $\lambda$ scans. These states are populated during inflation to create a multiverse with different quartic couplings, with a probability distribution $P$ that can be computed. If $P$ is peaked in the anthropically forbidden region of Higgs instability, then the most probable universe compatible with observers would be close to the boundary, as observed. We discuss three scenarios depending on the Higgs vacuum selection mechanism: decay by quantum tunneling; by thermal fluctuations or by inflationary fluctuations.

    hep-phastro-ph.COhep-thPRD(2018)·10 citations
17. 17*

    Mass Pattern of the SM Fermions: Flavor Democracy Revisited

    U. Kaya🇹🇷 · S. Sultansoy🇹🇷

    Mass pattern of the SM fermions is one of the most important mysterious in particle physics. Flavor Democracy could shed light on this mystery. Addition of isosinglet quark and isosinglet lepton give opportunity to obtain masses of charged leptons and quarks of the 2nd and 3rd family due to small deviations of full Flavor Democracy.

    hep-ph6 citations
18. 18*

    Predictive Leptogenesis from Minimal Lepton Flavour Violation

    L. Merlo🇪🇸 · S. Rosauro-Alcaraz🇪🇸

    A predictive Leptogenesis scenario is presented based on the Minimal Lepton Flavour Violation symmetry. In the realisation with three right-handed neutrinos transforming under the same flavour symmetry of the lepton electroweak doublets, lepton masses and PMNS mixing parameters can be described according to the current data, including a large Dirac CP phase. The observed matter-antimatter asymmetry of the Universe can be achieved through Leptogenesis, with the CP asymmetry parameter $\epsilon$ described in terms of only lepton masses, mixings and phases, plus two real parameters of the low-energy effective description. This is in contrast with the large majority of models present in the literature, where $\epsilon$ depends on several high-energy parameters, preventing a direct connection between low-energy observables and the baryon to photon ratio today. Recovering the correct amount of baryon asymmetry in the Universe constrains the Majorana phases of the PMNS matrix within specific ranges of values: clear predictions for the neutrinoless double beta decay emerge, representing a potential smoking gun for this framework.

    hep-phJHEP(2018)·21 citations
19. 19*

    A theoretical study of top-mass measurements at the LHC using NLO+PS generators of increasing accuracy

    Silvia Ferrario Ravasio · Tomas Jezo · Paolo Nason · Carlo Oleari

    In this paper we study the theoretical uncertainties in the determination of the top-quark mass using next-to-leading-order (NLO) generators interfaced to parton showers (PS) that have different levels of accuracy. Specifically we consider three generators: one that implements NLO corrections in the production dynamics, one that includes also NLO corrections in top decay in the narrow width approximation, and one that implements NLO corrections for both production and decay including finite-width and interference effects. Since our aim is to provide an assessment of the uncertainties of purely theoretical origin, we consider simplified top-mass related observables that are broadly related to those effectively used by experiments, eventually modelling experimental resolution effects with simple smearing procedures. We estimate the differences in the value of the extracted top mass that would occur due to the use of the three different NLO generators, to the variation of scales, to the choice of parton distribution functions and to the matching procedure. Furthermore, we also consider differences due to the shower and to the modelling of non-perturbative effects by interfacing our NLO generators to both Pythia8.2 and Herwig7.1, with various settings. We find very different results depending upon the adopted shower model. While with Pythia8.2 we find moderate differences between the different NLO+PS generators, with Herwig7.1 we find very large ones. Furthermore, the differences between Pythia8.2 and Herwig7.1 generators are also remarkably large.

    hep-phhep-ex
20. 20*

    Indications of an unexpected signal associated with the GW170817 binary neutron star inspiral

    E. Fischbach🇺🇸 · V. E. Barnes🇺🇸 · N. Cinko🇺🇸 · J. Heim🇺🇸 · H. B. Kaplan🇺🇸 · D. E. Krause🇺🇸 · J. R. Leeman🇺🇸 · S. A. Mathews🇺🇸 · M. J. Mueterthies🇺🇸 · D. Neff🇺🇸 · M. Pattermann🇺🇸

    We report experimental evidence at the 2.5$\sigma$ level for an unexpected signal associated with the GW170817 binary neutron star inspiral. This evidence derives from a laboratory experiment simultaneously measuring the $\beta$-decay rates of Si-32 and Cl-36 in a common detector. Whereas the Si-32 and Cl-36 decay rates show no statistical correlation before or after the inspiral, they are highly correlated ($\sim 95\%$) in the 5 hour time interval immediately following the inspiral. If we interpret this correlation as arising from the influence of particles emitted during the inspiral, then we can estimate the mass $m_x$ of these particles from the time delay between the gravity-wave signal and a peak in the $\beta$-decay data. We find for particles of energy 10 MeV, $m_x$ $\lesssim$ 16 eV which includes the neutrino mass region $m_{\nu }$ $\lesssim$ 2 eV. The latter is based on existing limits for the masses $m_i$ of the three known neutrino flavors. Additionally, we find that the correlation is even stronger if we include data in the 80 minute period before the arrival of the gravity wave signal. Given the large number of radionuclides whose decays are being monitored at any given time, we conjecture that other groups may also be in a position to search for statistically suggestive fluctuations of radionuclide decay rates associated with the GW170817 inspiral, and possibly with other future inspirals.

    ↳ astro-ph.HEhep-phAstropart.Phys.(2018)·12 citations
21. 21*

    Complete and Consistent Chiral Transport from Wigner Function Formalism

    Anping Huang🇨🇳 · Shuzhe Shi🇺🇸 · Yin Jiang🇨🇳 · Jinfeng Liao🇺🇸 · Pengfei Zhuang🇨🇳

    Recently there has been significant interest in understanding the macroscopic quantum transport in a many-body system of chiral fermions. A natural framework for describing such a system which is generally out of equilibrium, is the transport equation for its phase space distribution function. In this paper, we obtain a complete solution of the covariant chiral transport for massless fermions, by starting from the general Wigner function formalism and carrying out a complete and consistent semiclassical expansion up to $\hat{\mathbf{O}}(\hslash )$ order. In particular, we clarify certain subtle and confusing issues surrounding the Lorentz non-invariance and frame dependence associated with the 3D chiral kinetic theory. We prove that such frame dependence is uniquely and completely fixed by an unambiguous definition of the $\hat{\mathbf{O}}(\hslash )$ correction to the distribution function in each reference frame.

    ↳ hep-thhep-phnucl-thPRD(2018)·145 citations
22. 22*

    SO(32) heterotic line bundle models

    Hajime Otsuka🇯🇵

    We search for the three-generation standard-like and/or Pati-Salam models from the $SO(32)$ heterotic string theory on smooth, quotient complete intersection Calabi-Yau threefolds with multiple line bundles, each with structure group $U(1)$. These models are S- and T-dual to intersecting D-brane models in type IIA string theory. We find that the stable line bundles and Wilson lines lead to the standard model gauge group with an extra $U(1{)}_{B-L}$ via a Pati-Salam-like symmetry and the obtained spectrum consists of three chiral generations of quarks and leptons, and vector-like particles. Green-Schwarz anomalous U(1) symmetries control not only the Yukawa couplings of the quarks and leptons but also the higher-dimensional operators causing the proton decay.

    ↳ hep-thhep-phJHEP(2018)·11 citations
23. 23*

    Galaxy Formation in Sterile Neutrino Dark Matter Models

    N. Menci🇮🇹 · A. Grazian🇮🇹 · A. Lamastra🇮🇹 · F. Calura🇮🇹 · M. Castellano🇮🇹 · P. Santini🇮🇹

    We investigate galaxy formation in models with dark matter (DM) constituted by sterile neutrinos. Given their large parameter space, defined by the combinations of sterile neutrino mass $m_{\nu }$ and mixing parameter ${\sin }^2(2\theta )$ with active neutrinos, we focus on models with $m_{\nu }=7$ keV, consistent with the tentative 3.5 keV line detected in several X-ray spectra of clusters and galaxies. We consider i) two resonant production models with ${\sin }^2(2\theta )=510^{-11}$ and ${\sin }^2(2\theta )=210^{-10}$, to cover the range of mixing parameter consistent with the 3.5 keV line; ii) two scalar-decay models, representative of the two possible cases characterizing such a scenario: a freeze-in and a freeze-out case. We also consider thermal Warm Dark Matter with particle mass $m_X=3$ keV. Using a semi-analytic model, we compare the predictions for the different DM scenarios with a wide set of observables. We find that comparing the predicted evolution of the stellar mass function, the abundance of satellites of Milky Way-like galaxies, and the global star formation history of galaxies with observations does not allow to disentangle the effects of the baryonic physics from those related to the different DM models. On the other hand, the distribution of the stellar-to-halo mass ratios, the abundance of faint galaxies in the UV luminosity function at $z\gtrsim 6$, and the specific star formation and age distribution of local, low-mass galaxies constitute potential probes for the considered DM scenarios. We discuss how next observations with upcoming facilities will enable to rule out or to strongly support DM models based on sterile neutrinos.

    ↳ astro-ph.COastro-ph.GAhep-phApJ(2018)·28 citations
24. 24*

    General relativistic polytropes in anisotropic stars

    A. A. Isayev🇺🇦

    Spherically symmetric relativistic stars with the polytropic equation of state (EoS), which possess the local pressure anisotropy, are considered within the framework of general relativity. The generalized Lane-Emden equations are derived for the arbitrary anisotropy parameter $\Delta =p_t-p_r$ ($p_t$ and $p_r$ being the transverse and radial pressure, respectively). They are then applied to some special ansatz for the anisotropy parameter in the form of the differential relation between the anisotropy parameter $\Delta$ and the metric function $\nu$. The analytical solutions of the obtained equations are found for incompressible fluid stars and then used for getting their mass-radius relation, gravitational and binding energy. Also, following the Chandrasekhar variational approach, the dynamical stability of incompressible anisotropic fluid stars with the polytropic EoS against radial oscillations is studied. It is shown that the local pressure anisotropy with $p_t>p_r$ can make the incompressible fluid stars unstable with respect to radial oscillations, in contrast to incompressible isotropic fluid stars with the polytropic EoS which are dynamically stable.

    ↳ gr-qcastro-ph.HEhep-phPRD(2017)·39 citations
25. 25*

    First Measurement of Monoenergetic Muon Neutrino Charged Current Interactions

    A. A. Aguilar-Arevalo🇲🇽 · B. C. Brown🇺🇸 · L. Bugel🇺🇸 · G. Cheng🇺🇸 · E. D. Church🇺🇸 · J. M. Conrad🇺🇸 · R. L. Cooper🇺🇸 · R. Dharmapalan🇺🇸 · Z. Djurcic🇺🇸 · D. A. Finley🇺🇸 · R. S. Fitzpatrick🇺🇸 · R. Ford🇺🇸 and 37 other authors

    We report the first measurement of monoenergetic muon neutrino charged current interactions. MiniBooNE has isolated 236 MeV muon neutrino events originating from charged kaon decay at rest ($K^{+}\to {\mu }^{+}{\nu }_{\mu }$) at the NuMI beamline absorber. These signal ${\nu }_{\mu }$-carbon events are distinguished from primarily pion decay in flight ${\nu }_{\mu }$ and ${\overline{\nu }}_{\mu }$ backgrounds produced at the target station and decay pipe using their arrival time and reconstructed muon energy. The significance of the signal observation is at the 3.9$\sigma$ level. The muon kinetic energy, neutrino-nucleus energy transfer ($\omega =E_{\nu }-E_{\mu }$), and total cross section for these events is extracted. This result is the first known-energy, weak-interaction-only probe of the nucleus to yield a measurement of $\omega$ using neutrinos, a quantity thus far only accessible through electron scattering.

    ↳ hep-exhep-phnucl-exPRL(2018)·66 citations
26. 26*

    Poisson baseline of net-charge fluctuations in the relativistic heavy ion collisions

    Xue Pan🇨🇳 · Yufu Lin🇨🇳 · Lizhu Chen🇨🇳 · Mingmei Xu🇨🇳 · Yuanfang Wu🇨🇳

    Taking doubly charged particles, positive-negative charge pair production and the effects of volume fluctuations into account, the Poisson baseline of the fluctuations of net-charge is studied. Within the Poisson baseline, the cumulants of net-charge are derived. Comparing to the Skellam baseline of net-charge, we infer that doubly charged particles broaden the distributions of net-charge, while positive-negative charge pairs narrow the distributions. Using the ratios of doubly charged particles and positive-negative charge pairs from neutral resonance decays to the total positive charges from THERMINATOR 2, the first four orders of moments and the corresponding moment products are calculated in the Poisson baseline for Au + Au collisions at $\sqrt{s_{NN}}$ = 200 GeV at RHIC/STAR. We find that the standard deviation is mainly influenced by the resonance decay, while the third and fourth order moments and corresponding moment products are mainly modified and fit the data of RHIC/STAR much better after including the effects of volume fluctuations.

    ↳ nucl-thhep-exhep-phCPC(2018)·1 citation

* 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.