Thu·Feb 2, 2017Thursday·February 2, 2017

1. 01*

   Chiral Symmetry Breaking by Monopole Condensation

   Aiichi Iwazaki🇯🇵

   Under the assumption of Abelian dominance in QCD, we have shown that chiral condensate is locally present around each QCD monopole. The essence is that either of charge or chirality of a quark is not conserved, when the low energy massless quark collides with QCD monopole. In reality, the charge is conserved so that the chirality is not conserved. Reviewing the presence of the local chiral condensate, we show by using chiral anomaly that chiral non symmetric quark pair production takes place when a quark is putted in a vacuum with monopole condensation, while chiral symmetric pair production takes place in a vacuum with no monopole condensation. Our results strongly indicate that the chiral symmetry is broken by the monopole condensation.

   hep-phInt.J.Mod.Phys.A(2017)·1 citation
2. 02*

   Projections for Neutral Di-Boson and Di-Higgs Interactions at FCC-he Collider

   S. Kuday🇹🇷 · H. Saygin🇹🇷 · I. Hos🇹🇷 · F. Cetin🇹🇷

   As a high energy e-p collider, FCC-he, has been recently proposed with sufficient energy options to investigate Higgs couplings. To analyse the sensitivity on the Higgs boson couplings, we focus spesifically on the CP-even and CP-odd Wilson coefficients with $hhZZ$and $hh\gamma \gamma$ four-point interactions of Higgs boson with Effective Lagrangian Model through the process $e^{-}p\to hhj{e}^{-}$ . We simulate the related processes in FCC-he, with 60 GeV and 120 GeV $e^{-}$ beams and 50 TeV proton beam collisions. We present the exclusion limits on these couplings both for 68% and 95% C.L. in terms of integrated luminosities.

   hep-phNPB(2018)·8 citations
3. 03*

   Dark Matter Candidates in a Visible Heavy QCD Axion Model

   Hajime Fukuda🇯🇵 · Masahiro Ibe🇯🇵 · Tsutomu T. Yanagida🇯🇵

   In this paper, we discuss dark matter candidates in a visible heavy QCD axion model. There, a mirror copied sector of the Standard Model with mass scales larger than the Standard Model is introduced. By larger mass scales of the mirrored sector, the QCD axion is made heavy via the axial anomaly in the mirrored sector without spoiling the Peccei-Quinn mechanism to solve the strong $CP$-problem. Since the mirror copied sector possesses the same symmetry structure with the Standard Model sector, the model predicts multiple stable particles. As we will show, the mirrored charged pion and the mirrored electron can be viable candidates for dark matter. They serve as self-interacting dark matter with a long range force. We also show that the mirrored neutron can be lighter than the mirrored proton in a certain parameter region. There, the mirrored neutron can also be a viable dark matter candidate when its mass is around $100$ TeV. It is also shown that the mirrored neutrino can also be a viable candidate for dark matter.

   hep-phPRD(2017)·10 citations
4. 04*

   Associated production of a dilepton and a ${\rm Y}(J/\psi )$ at the LHC as a probe of gluon transverse momentum dependent distributions

   Jean-Philippe Lansberg🇫🇷 · Cristian Pisano🇮🇹 · Marc Schlegel🇩🇪

   We discuss the impact on the study of gluon transverse momentum dependent distributions (TMDs) of the associated production of a lepton pair and a ${\rm Y}$ (or a $J/\psi$) in unpolarised proton-proton collisions, $pp\to \mathcal{Q}\ell \bar{\ell }X$, at LHC energies, where one can assume that such final states are dominantly induced by gluon fusion. If the transverse momentum of the quarkonium-dilepton system - namely, the transverse momentum imbalance of the quarkonium state and the lepton pair - is small, the corresponding cross sections can be calculated within the framework of TMD factorisation. Using the helicity formalism, we show in detail how these cross sections are connected to the moments of two independent TMDs: the distribution of unpolarised gluons, $f_1^g$, and the distribution of linearly polarised gluons, $h_1^{\perp g}$. We complete our exhaustive derivation of these general relations with a phenomenological analysis of the feasibility of the TMD extraction, as well as some outlooks.

   hep-phhep-exNPB(2017)·60 citations
5. 05*

   Exclusive neutrino-production of a charmed meson

   B. Pire🇫🇷 · L. Szymanowski🇵🇱 · J. Wagner🇵🇱

   We calculate the leading order in ${\alpha }_s$ QCD amplitude for exclusive neutrino and antineutrino production of a $D$ pseudoscalar charmed meson on an unpolarized nucleon. We work in the framework of the collinear QCD approach where generalized parton distributions (GPDs) factorize from perturbatively calculable coefficient functions. We include both $O(m_c)$ terms in the coefficient functions and $O(M_D)$ mass term contributions in the heavy meson distribution amplitudes. We emphasize the sensitivity of specific observables on the transversity quark GPDs.

   hep-phhep-exnucl-exnucl-thPRD(2017)·31 citations
6. 06*

   Two-body decays of gluino at full one-loop level in the quark-flavour violating MSSM

   Helmut Eberl🇦🇹 · Elena Ginina🇦🇹 · Keisho Hidaka🇯🇵

   We study the two-body decays of the gluino at full one-loop level in the Minimal Supersymmetric Standard Model with quark-flavour violation (QFV) in the squark sector. The renormalization is done in the $\overline{\mathrm{DR}}$ scheme. The gluon and photon radiations are included by adding the corresponding three-body decay widths. We discuss the dependence of the gluino decay widths on the QFV parameters. The main dependence stems from the ${\tilde{c}}_R-{\tilde{t}}_R$ mixing in the decays to up-type squarks, and from the ${\tilde{s}}_R-{\tilde{b}}_R$ mixing in the decays to down-type squarks due to the strong constraints from B-physics on the other quark-flavour mixing parameters. The full one-loop corrections to the gluino decay widths are mostly negative and of the order of about -10\%. The QFV part stays small in the total width but can vary up to -8\% for the decay width into the lightest squark. For the corresponding branching ratio the effect is somehow washed out by at least a factor of two. The electroweak corrections can be as large as 35\% of the SUSY QCD corrections.

   hep-phEPJC(2017)·11 citations
7. 07*

   No-Scale SU(5) Super-GUTs

   John Ellis🇬🇧 · Jason L. Evans🇰🇷 · Natsumi Nagata🇯🇵 · Dimitri V. Nanopoulos🇺🇸 · Keith A. Olive🇺🇸

   We reconsider the minimal SU(5) Grand Unified Theory (GUT) in the context of no-scale supergravity, assuming that the soft supersymmetry-breaking parameters satisfy universality conditions at some input scale M_in above the GUT scale M_GUT. When setting up such a no-scale super-GUT model, special attention must be paid to avoiding the Scylla of rapid proton decay and the Charybdis of an excessive density of cold dark matter, while also having an acceptable mass for the Higgs boson. We do not find consistent solutions if none of the matter and Higgs fields are assigned to twisted chiral supermultiplets, even in the presence of Giudice-Masiero terms. However, consistent solutions may be found if at least one fiveplet of GUT Higgs fields is assigned to a twisted chiral supermultiplet, with a suitable choice of modular weights. Spin-independent dark matter scattering may be detectable in some of these consistent solutions.

   hep-phastro-ph.COEPJC(2017)·20 citations
8. 08*

   $P_c(4380)$ in a constituent quark model

   Woosung Park🇰🇷 · Aaron Park🇰🇷 · Sungtae Cho🇰🇷 · Su Houng Lee🇰🇷

   The constituent quark model with color-spin hyperfine potential is used to investigate the property of a compact pentaquark configuration with $J^p$=$3/2^{-}$ and isospin=1/2, which is the most likely quantum number of one of the recently observed exotic baryon states at LHCb. Starting from the characterization of the isospin, color, and spin states for the pentaquark configuration, we construct the total wave function composed of the spatial wave function, which we take to be symmetric and in S-wave, and the four orthogonal isospin $\otimes$ color $\otimes$ spin states that satisfy the Pauli principle. We then use the variational method to find a compact stable configuration. While there are compact configurations where the hyperfine potential is more attractive than the sum of $p$ and $J/\psi$ hyperfine potentials, we find that the ground state is the isolated $p$ and $J/\psi$ state. Furthermore, the mass of the excited state lies far above the observed pentaquark state leading us to conclude that the observed states can not be a compact multiquark configuration with $J^p$=$3/2^{-}$.

   hep-phPRD(2017)·35 citations
9. 09*

   Combining TMD factorization and collinear factorization

   J. Collins🇺🇸 · L. Gamberg🇺🇸 · A. Prokudin🇺🇸 · T.C. Rogers🇺🇸 · N.Sato🇺🇸 · B.Wang🇺🇸

   We examine some of the complications involved when combining (matching) TMD factorization with collinear factorization to allow accurate predictions over the whole range of measured transverse momentum in a process like Drell-Yan. Then we propose some improved methods for combining the two types of factorization. (This talk is based on work reported in arXiv:1605.00671.)

   hep-ph2 citations
10. 10*

    Hidden sector explanation of $B$-decay and cosmic ray anomalies

    James M. Cline🇨🇦 · Jonathan M. Cornell🇨🇦 · David London🇨🇦 · Ryoutaro Watanabe🇨🇦

    There are presently several discrepancies in $b\to s{\ell }^{+}{\ell }^{-}$ decays of $B$ mesons suggesting new physics coupling to $b$ quarks and leptons. We show that a $Z^{\prime }$, with couplings to quarks and muons that can explain the $B$-decay anomalies, can also couple to dark matter in a way that is consistent with its relic abundance, direct detection limits, and hints of indirect detection. The latter include possible excess events in antiproton spectra recently observed by the AMS-02 experiment. We present two models, having a heavy (light) $Z^{\prime }$ with $m_{Z^{\prime }}\sim 600(12)$GeV and fermionic dark matter with mass $m_{\chi }\sim 50(2000)$GeV, producing excess antiprotons with energies of $\sim 10(300)$GeV. The first model is also compatible with fits for the galactic center GeV gamma-ray excess.

    hep-phastro-ph.COastro-ph.HEPRD(2017)·48 citations
11. 11*

    Unified Models of the QCD Axion and Supersymmetry Breaking

    Keisuke Harigaya🇺🇸 · Jacob Leedom🇺🇸

    Similarities between the gauge meditation of supersymmetry breaking and the QCD axion model suggest that they originate from the same dynamics. We present a class of models where supersymmetry and the Peccei-Quinn symmetry are simultaneously broken. The messengers that mediate the effects of these symmetry breakings to the Standard Model are identical. Since the axion resides in the supersymmetry breaking sector, the saxion and the axino are heavy. We show constraints on the axion decay constant and the gravitino mass.

    hep-phNPB(2017)·11 citations
12. 12*

    The Maximally Symmetric Composite Higgs

    Csaba Csaki🇺🇸 · Teng Ma🇨🇳 · Jing Shu🇨🇳

    We present a novel class of calculable four dimensional composite pseudo-Goldstone boson Higgs models based on symmetric G/H coset spaces which contain a Higgs-parity operator V as well as a linear representation ${\Sigma }^{\prime }$ for the Goldstone bosons. For such cosets the low-energy effective Lagrangian for the Standard Model fields can have an enhanced global symmetry which we call the maximal symmetry. We show that such a maximally symmetric case leads to a finite and fully calculable Higgs potential, which also minimizes the tuning by eliminating double tuning and reducing the Higgs mass. We present a detailed analysis of the Maximally Symmetric SO(5)/SO(4) model, and comment on its observational consequences.

    hep-phhep-thPRL(2017)·64 citations
13. 13*

    Current LHC Constraints on Minimal Universal Extra Dimensions

    Nicolas Deutschmann🇫🇷 · Thomas Flacke🇰🇷 · Jong Soo Kim🇰🇷

    In this letter, we present LHC limits on the minimal universal extra dimension (MUED) model from LHC Run 1 data and current limits from searches of the ongoing Run 2. Typical collider signals of the Kaluza-Klein (KK) states mimic generic degenerate supersymmetry (SUSY) missing transverse momentum signatures since the excited KK particles cascade decay to jets, leptons and the lightest KK particle which is stable due to KK parity and thus evades detection. We test the parameter space against a large number of supersymmetry based missing energy searches implemented in the public code CheckMATE. We demonstrate the complementarity of employing various searches which target a large number of final state signatures, and we derive the most up to date limits on the MUED parameter space from 13 TeV SUSY searches.

    hep-phPLB(2017)·61 citations
14. 14*

    2013-2016 review: HE Neutrino and UHECR Astronomy?

    D.Fargion🇮🇹 · P.Oliva🇮🇹

    The last few years, 2013-2016, the high energy neutrino events in ICECUBE and the last rich UHECR maps by AUGER and TA were hopefully opening a new High Energy astronomy age. Unfortunately the foreseen correlation between neutrino with best gamma X sources has not (yet) been found. The most celebrated GRB gamma sources do not correlate to any neutrino events. The expected Local Group anisotropy in UHECR within the nuleon GZK cut off, has just fade away. UHECR events from Virgo are almost absent. Above two hundred TeV energy tau neutrino might shine by double bang in detectable way in ICECUBE. Within a dozen of events no tau neutrino arised (yet) in ICECUBE. Finally GRBs Fireball models calling since decades for HE neutrinos correlated imprint at TeVs energy are not (yet) found. So many absences are making a huge question mark: is there a new reading key?

    ↳ astro-ph.HEhep-ph2 citations
15. 15*

    Flavor-dependent neutrino angular distribution in core-collapse supernovae

    Irene Tamborra (NBI, Copenhagen)🇩🇰 · Lorenz Huedepohl (MPCDF, Garching)🇩🇪 · Georg Raffelt (MPI Physics, Munich)🇩🇪 · Hans-Thomas Janka (MPI Astrophysics, Garching)🇩🇪

    According to recent studies, the collective flavor evolution of neutrinos in core-collapse supernovae depends strongly on the flavor-dependent angular distribution of the local neutrino radiation field, notably on the angular intensity of the electron-lepton number carried by neutrinos. To facilitate further investigations of this subject, we study the energy and angle distributions of the neutrino radiation field computed with the Vertex neutrino-transport code for several spherically symmetric (1D) supernova simulations (of progenitor masses 11.2, 15 and 25 M_sun) and explain how to extract this information from additional models of the Garching group. Beginning in the decoupling region ("neutrino sphere"), the distributions are more and more forward peaked in the radial direction with an angular spread that is largest for ${\nu }_e$, smaller for ${\bar{\nu }}_e$, and smallest for ${\nu }_x$, where $x=\mu$ or $\tau$. While the energy-integrated ${\nu }_e$ minus ${\bar{\nu }}_e$ angle distribution has a dip in the forward direction, it does not turn negative in any of our investigated cases.

    ↳ astro-ph.HEhep-phApJ(2017)·111 citations
16. 16*

    Recent selected theory developments for NICA

    David Blaschke🇷🇺

    In this contribution I present a few selected topics of recent theoretical developments of relevance for the NICA facility under construction. In a first part, I discuss new aspects of the QCD phase diagram like the possible existence of a critical endpoint of first-order phase transitions from the perspective of generalizations of the 3-flavor PNJL model including the conjecture of a universal pressure for the onset of deconfinement in heavy-ion collisions and astrophysics. A second part is devoted to first results of the newly constructed event simulator (THESEUS) which is based on the particlization of the former three-fluid hydrodynamics code by Ivanov, Russkikh and Toneev that allows also to study the role of hadronic final state interactions. Possible signals of the mixed phase accessible at NICA are considered. In particular, the robustness of the baryon-stopping signal of deconfinement and the occurrence of antiflow for protons have been investigated for Au+Au collisions in the range of the NICA-MPD energy scan for $\sqrt{s}\sim 6\dots 8$ GeV. This signal is reflected also in the flow pattern of light nuclear clusters, in particular deuterons. The sharp peak for the $K^{+}/{\pi }^{+}$ ratio at $\sqrt{s}\sim 8$ GeV (the "horn" effect) is not obtained in the present version of THESEUS and calls for improvement of the equation of state input. I report the recent progress in developing a generalized Beth-Uhlenbeck approach to a unified description of quark-hadron matter which includes now strangeness and reveals a new mechanism for explaining the $K^{+}/{\pi }^{+}$ ratio due to the pronounced occurrence of an anomalous mode in the $K^{+}$ at finite baryochemical potentials.

    ↳ nucl-thhep-phEPJ Web Conf.(2017)·5 citations
17. 17*

    Lattice QCD at nonzero temperature and density

    Heng-Tong Ding🇨🇳

    In this talk I review the current status of lattice QCD calculations at nonzero temperature and density. I focus on the QCD phase structure and bulk QCD thermodynamics at zero and nonzero chemical potentials.

    ↳ hep-lathep-phnucl-thPoS(2017)·35 citations
18. 18*

    Non-standard hierarchies of the runnings of the spectral index in inflation

    Chris Longden🇬🇧

    Recent analyses of cosmic microwave background surveys have revealed hints that there may be a non-trivial running of the running of the spectral index. If future experiments were to confirm these hints, it would prove a powerful discriminator of inflationary models, ruling out simple single field models. We discuss how isocurvature perturbations in multi-field models can be invoked to generate large runnings in a non-standard hierarchy, and find that a minimal model capable of practically realising this would be a two-field model with a non-canonical kinetic structure. We also consider alternative scenarios such as variable speed of light models and canonical quantum gravity effects and their implications for runnings of the spectral index.

    ↳ astro-ph.COgr-qchep-phUniverse(2017)·5 citations
19. 19*

    Charm hadrons and lattice QCD

    Lorenzo Riggio🇮🇹 · Giorgio Salerno🇮🇹

    We review two lattice calculations involving charm hadrons: a determination of the vector and scalar form factors of the semileptonic $D\to \pi \ell \nu$ decays, which are relevant for the extraction of the CKM matrix element $|V_{cd}|$ from experimental data, and a calculation of the matrix elements of four-fermion operators relevant to the description of the neutral D mixing in the Standard Model and its extensions. Both analyses are based on the gauge configurations produced by the European Twisted Mass Collaboration with $N_f=2+1+1$ flavors of dynamical quarks. We simulated at three different values of the lattice spacing and with pion masses as small as 210 MeV.

    ↳ hep-lathep-phPoS(2016)·1 citation
20. 20*

    EPFL Lectures on General Relativity as a Quantum Field Theory

    John F. Donoghue🇺🇸 · Mikhail M. Ivanov🇨🇭 · Andrey Shkerin🇨🇭

    These notes are an introduction to General Relativity as a Quantum Effective Field Theory, following the material given in a short course on the subject at EPFL. The intent is to develop General Relativity starting from a quantum field theoretic viewpoint, and to introduce some of the techniques needed to understand the subject.

    ↳ hep-thgr-qchep-ph192 citations
21. 21*

    Ratios of helicity amplitudes for exclusive ${\rho }^0$ electroproduction on transversely polarized protons

    The HERMES Collaboration: A. Airapetian🇩🇪 · N. Akopov🇦🇲 · Z. Akopov🇩🇪 · E.C. Aschenauer🇺🇸 · W. Augustyniak🇵🇱 · S. Belostotski🇷🇺 · H.P. Blok🇳🇱 · A. Borissov🇩🇪 · V. Bryzgalov🇷🇺 · G.P. Capitani🇮🇹 · G. Ciullo🇮🇹 · M. Contalbrigo🇮🇹 and 64 other authors

    Exclusive ${\rho }^0$-meson electroproduction is studied by the HERMES experiment, using the 27.6 GeV longitudinally polarized electron/positron beam of HERA and a transversely polarized hydrogen target, in the kinematic region 1.0 GeV${}^2$<Q${}^2$<7.0 GeV${}^2$, 3.0 GeV<W<6.3 GeV, and -t'<0.4 GeV${}^2$. Using an unbinned maximum-likelihood method, 25 parameters are extracted. These determine the real and imaginary parts of the ratios of several helicity amplitudes describing ${\rho }^0$-meson production by a virtual photon. The denominator of those ratios is the dominant amplitude, the nucleon-helicity-non-flip amplitude $F_{0\frac{1}{2}0\frac{1}{2}}$, which describes the production of a longitudinal ${\rho }^0$-meson by a longitudinal virtual photon. The ratios of nucleon-helicity-non-flip amplitudes are found to be in good agreement with those from the previous HERMES analysis. The transverse target polarization allows for the first time the extraction of ratios of a number of nucleon-helicity-flip amplitudes to $F_{0\frac{1}{2}0\frac{1}{2}}$. Results obtained in a handbag approach based on generalized parton distributions taking into account the contribution from pion exchange are found to be in good agreement with these ratios. Within the model, the data favor a positive sign for the $\pi -\rho$ transition form factor. By also exploiting the longitudinal beam polarization, a total of 71 ${\rho }^0$ spin-density matrix elements is determined from the extracted 25 parameters, in contrast to only 53 elements as directly determined in earlier analyses.

    ↳ hep-exhep-phEPJC(2017)·15 citations
22. 22*

    Towards Radiative Transitions in Charmonium

    Cian O'Hara🇮🇪 · Sinéad M. Ryan🇮🇪 · Graham Moir🇬🇧 · Christopher E. Thomas🇬🇧

    We present preliminary calculations towards radiative transitions in charmonium using anisotropic $N_f=2+1$ dynamical ensembles generated by the Hadron Spectrum Collaboration. With the use of newer technologies we aim to investigate transitions between states, including potential exotic charmonium states, lying higher in the spectrum than in previous studies. A crucial ingredient in this work is the use of variationally optimised interpolating operators which allow for a reliable determination of the three-point correlation functions needed. Using these operators, we perform first calculations of relevant three-point correlation functions before discussing future directions.

    ↳ hep-lathep-phPoS(2016)·4 citations
23. 23*

    Sommerfeld-Enhanced $J$-Factors For Dwarf Spheroidal Galaxies

    Kimberly K. Boddy🇺🇸 · Jason Kumar🇺🇸 · Louis E. Strigari🇺🇸 · Mei-Yu Wang🇺🇸

    For models in which dark matter annihilation is Sommerfeld-enhanced, the annihilation cross section increases at low relative velocities. Dwarf spheroidal galaxies (dSphs) have low characteristic dark matter particle velocities and are thus ideal candidates to study such models. In this paper we model the dark matter phase space of dSphs as isotropic and spherically-symmetric, and determine the $J$-factors for several of the most important targets for indirect dark matter searches. For Navarro-Frenk-White density profiles, we quantify the scatter in the $J$-factor arising from the astrophysical uncertainty in the dark matter potential. We show that, in Sommerfeld-enhanced models, the ordering of the most promising dSphs may be different relative to the standard case of velocity-independent cross sections. This result can have important implications for derived upper limits on the annihilation cross section, or on possible signals, from dSphs.

    ↳ astro-ph.COhep-phPRD(2017)·59 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.