Tue·Aug 14, 2018Tuesday·August 14, 2018

1. 01*

   Novel tools and observables for jet physics in heavy-ion collisions

   Harry Arthur Andrews🇬🇧 · Liliana Apolinario🇵🇹 · Redmer Alexander Bertens🇺🇸 · Christian Bierlich🇸🇪 · Matteo Cacciari🇫🇷 · Yi Chen🇨🇭 · Yang-Ting Chien🇺🇸 · Leticia Cunqueiro Mendez🇺🇸 · Michal Deak🇵🇱 · David d'Enterria🇨🇭 · Fabio Dominguez🇪🇸 · Philip Coleman Harris🇺🇸 and 16 other authors

   Studies of fully-reconstructed jets in heavy-ion collisions aim at extracting thermodynamical and transport properties of hot and dense QCD matter. Recently, a plethora of new jet substructure observables have been theoretically and experimentally developed that provide novel precise insights on the modifications of the parton radiation pattern induced by a QCD medium. This report, summarizing the main lines of discussion at the 5th Heavy Ion Jet Workshop and CERN TH institute "Novel tools and observables for jet physics in heavy-ion collisions" in 2017, presents a first attempt at outlining a strategy for isolating and identifying the relevant physical processes that are responsible for the observed medium-induced jet modifications. These studies combine theory insights, based on the Lund parton splitting map, with sophisticated jet reconstruction techniques, including grooming and background subtraction algorithms.

   hep-phnucl-thJ.Phys.G(2020)·133 citations
2. 02*

   Equation of state for QCD with a critical point from the 3D Ising Model

   Paolo Parotto🇺🇸

   Current knowledge of the finite-density QCD equation of state from first principles is limited to a Taylor expansion in the baryonic chemical potential around ${\mu }_B=0$. By means of a scaling form for the equation of state of the 3D Ising model and a non-universal, parametrized map to QCD coordinates, we construct a family of equations of state matching state of the art first principle Lattice QCD calculations and including the correct critical behavior, which can be readily employed in hydrodynamical simulations of heavy ion collisions at finite density, covering most of the BES range at RHIC. This contribution reports on work done within the Fluctuations/Equation of State working group of the BEST Collaboration.

   hep-phnucl-thNPA(2019)·4 citations
3. 03*

   DarkCapPy: Dark Matter Capture and Annihilation

   Adam Green🇺🇸 · Philip Tanedo🇺🇸

   DarkCapPy is a Python 3/Jupyter package for calculating rates associated with dark matter capture in the Earth, annihilation into light mediators, and the subsequent observable decay of the light mediators near the surface of the Earth. The package includes a calculation of the Sommerfeld enhancement at the center of the Earth and the timescale for capture--annihilation equilibrium. The code is open source and can be modified for other compact astronomical objects and mediator spins.

   hep-phphysics.comp-phComput.Phys.Commun.(2019)·12 citations
4. 04*

   Addendum to "Overview of ${\Lambda }_c$ decays''

   Michael Gronau🇮🇱 · Jonathan L. Rosner🇺🇸 · Charles G. Wohl🇺🇸

   An earlier analysis of observed and anticipated ${\Lambda }_c$ decays [M. Gronau and J. L. Rosner, Phys.\ Rev.\ D {\bf 97}, 116015 (2018)] is provided with a table of inputs and a figure denoting branching fractions. This addendum is based on the 2018 Particle Data Group compilation and employs a statistical isospin model to estimate branching fractions for as-yet-unseen decay modes.

   hep-phhep-exPRD(2018)·28 citations
5. 05*

   Impact of vector new physics couplings on $B_s\to (K,K^{\ast })\tau \nu$ and $B\to \pi \tau \nu$ decays

   N. Rajeev🇮🇳 · Rupak Dutta🇮🇳

   Experimental measurements of $R_D$, $R_{D^{\ast }}$ and $R_{J/\Psi }$ in $B\to (D,D^{\ast })l\nu$ and $B_c\to J/\Psi l\nu$ decays mediated via $b\to cl\nu$ charged current interactions deviate from standard model prediction by $2.3\sigma$, $3.4\sigma$ and $2\sigma$, respectively. In addition, a deviation of $1.5\sigma$ from the standard model prediction has been witnessed in $\mathcal{B}(B\to \tau \nu )$ mediated via $b\to ul\nu$ charged current interactions as well. Motivated by the anomalies present in $B$ and $B_c$ meson decays, we analyze the corresponding $B_s\to (K,K^{\ast })\tau \nu$ and $B\to \pi \tau \nu$ semileptonic decays within the standard model and beyond. We use an effective field theory formalism in which $b\to c$ and $b\to u$ semileptonic decays are assumed to exhibit similar new physics patterns. We give the predictions of various observables such as the branching fractions, ratio of branching ratios, lepton side forward backward asymmetry, lepton polarization fraction and convexity parameter for $B_s\to (K,K^{\ast })\tau \nu$ and $B\to \pi \tau \nu$ decay channels within the standard model and within various NP scenarios.

   hep-phPRD(2018)·18 citations
6. 06*

   Potential of octant degeneracy resolution in JUNO

   M.V. Smirnov🇨🇳 · Zh.J. Hu🇨🇳 · S.J. Li🇨🇳 · J.J. Ling🇨🇳

   This research continues to focus on the idea using cyclotronic antineutrino source for purposes of neutrino physics. Long baseline experiments suffer from degeneracies and correlations between ${\Theta }_{23}$, ${\delta }_{\mathrm{CP}}$ and the mass hierarchy (MH). However the combination of a superconductive cyclotron and a big liquid scintillator detector like JUNO in a medium baseline experiment, which does not depend on the MH, may allow us to determine whether the position of the mixing angle ${\Theta }_{23}$ is in the lower octant (LO) or upper octant (UO). Such an experiment would improve the precision of the ${\Theta }_{23}$ measurement to a degree which depends on the CP-phase.

   hep-phhep-exCPC(2019)·2 citations
7. 07*

   Model-independent study for the tau-neutrino electromagnetic dipole moments in $e^{+}{e}^{-}\to {\nu }_{\tau }{\bar{\nu }}_{\tau }\gamma$ at the CLIC

   A. Gutierrez-Rodriguez🇲🇽 · M. Köksal🇹🇷 · A. A. Billur🇹🇷 · M. A. Hernandez-Ruiz🇲🇽

   We conduce a study to probe the sensitivity of the process $e^{+}{e}^{-}\to (\gamma ,Z)\to {\nu }_{\tau }{\bar{\nu }}_{\tau }\gamma$ to the total cross section, the magnetic moment and the electric dipole moment of the tau-neutrino in a model-independent way. For this study, the beam polarization facility at the Compact Linear Collider (CLIC) along with the typical center-of-mass energies $\sqrt{s}=380-3000GeV$ and integrated luminosities $\mathcal{L}=10-3000f{b}^{-1}$ is considered. We estimate the sensitivity at the $95\%$ Confidence Level (C.L.) and systematic uncertainties ${\delta }_{sys}=0,5,10\%$ on the dipole moments of the tau-neutrino. It is shown that the process under consideration $e^{+}{e}^{-}\to (\gamma ,Z)\to {\nu }_{\tau }{\bar{\nu }}_{\tau }\gamma$ is a good prospect for study the dipole moments of the tau-neutrino at the CLIC. Also, our study illustrates the complementarity between CLIC and other $e^{+}{e}^{-}$ and $pp$ colliders in probing extensions of the Standard Model, and shows that the CLIC at high energy and high luminosity provides a powerful means to sensitivity estimates for the electromagnetic dipole moments of the tau-neutrino.

   hep-phPhys. Rev. D 98, 095013 (2018)·2 citations
8. 08*

   Scalar Meson Contributions to a_\mu from Hadronic Light-by-Light Scattering

   M. Knecht (CPT-CNRS - Aix-Marseille - Univ. Toulon, FR)🇫🇷 · S. Narison (LUPM-CNRS-Univ. Montpellier, FR)🇫🇷 · A. Rabemananjara🇲🇬 · D. Rabetiarivony (iHEPMAD-Antananarivo, MG)🇲🇬

   Using an effective \sigma/f_0(500) resonance, which describes the \pi\pi-->\pi\pi and \gamma\gamma-->\pi\pi scattering data, we evaluate its contribution and the ones of the other scalar mesons to the the hadronic light-by-light (HLbL) scattering component of the anomalous magnetic moment a_\mu of the muon. We obtain the conservative range of values: \sum_S~a_\mu^{lbl}\vert_S = -(4.51+- 4.12) 10^{-11}, which is dominated by the \sigma/f_0(500) contribution ( 50%~98%), and where the large error is due to the uncertainties on the parametrisation of the form factors. Considering our new result, we update the sum of the different theoretical contributions to a_\mu within the standard model, which we then compare to experiment. This comparison gives (a_\mu^{\rm exp} - a_\mu^{SM})= +(312.1+- 64.3) 10^{-11}, where the theoretical errors from HLbL are dominated by the scalar meson contributions.

   hep-phPLB(2018)·160 citations
9. 09*

   Forward trijet production in proton-nucleus collisions

   Yair Mulian🇫🇷

   Using the formalism of the light-cone wave function in perturbative QCD together with the hybrid factorization, we compute the cross-section for three particle production at forward rapidities in proton-nucleus collisions. In this picture, the three produced partons --- a quark accompanied by a gluon pair, or two quarks plus one antiquark --- are all generated via one or two successive splittings of a quark from the incoming proton, that was originally collinear with the latter. The three partons are put on-shell by their scattering off the nuclear target, described as Lorentz-contracted shockwave. We explicitly compute the three-parton Fock space components of the light-cone wave function of the incoming quark and its outgoing state, which encodes the information both on the evolution in time as well as the scattering process. This outgoing state is also an ingredient for other interesting calculations, like the next-to-leading order correction to the cross-section for the production of a pair of jets.

   hep-phPoS(2018)·1 citation
10. 10*

    Matter Effect of Light Sterile Neutrino: An Exact Analytical Approach

    Wei Li🇨🇳 · Jiajie Ling🇨🇳 · Fanrong Xu🇨🇳 · Baobiao Yue🇨🇳

    The light sterile neutrino, if it exists, will give additional contribution to matter effect when active neutrinos propagate through terrestrial matter. In the simplest 3+1 scheme, three more rotation angles and two more CP-violating phases in lepton mixing matrix make the interaction complicated formally. In this work, the exact analytical expressions for active neutrino oscillation probabilities in terrestrial matter, including sterile neutrino contribution, are derived. It is pointed out that this set of formulas contain information both in matter and in vacuum, and can be easily tuned by choosing related parameters. Based on the generic exact formulas, we present oscillation probabilities of typic medium and long baseline experiments. Taking NO$\nu$A experiment as an example, we show that in particular parameter space sterile neutrino gives important contribution to terrestrial matter effect, and Dirac phases play a vital role.

    hep-phJHEP(2018)·15 citations
11. 11*

    Clockworked VEVs and Neutrino Mass

    Avik Banerjee🇮🇳 · Subhajit Ghosh🇮🇳 · Tirtha Sankar Ray🇮🇳

    In this paper we present an augmented version of the Abelian scalar clockwork model to generate geometrically suppressed vacuum expectation values (vev) of the pseudo Nambu-Goldstone bosons, that we call the clockworked vevs. We briefly comment on generalization of the setup and possible 5D UV realizations. We demonstrate how tiny neutrino mass can be generated by clockworking a weak scale vev.

    hep-phJHEP(2018)·15 citations
12. 12*

    Effective chemical potential in spontaneous baryogenesis

    Arnab Dasgupta🇰🇷 · Rajeev Kumar Jain🇮🇳 · Raghavan Rangarajan🇮🇳

    Models of spontaneous baryogenesis have an interaction term ${\partial }_{\mu }\theta j_B^{\mu }$ in the Lagrangian, where $j_B^{\mu }$ is the baryonic current and $\theta$ can be a pseudo-Nambu-Goldstone boson. Since the time component of this term, $\dot{\theta }{j}_B^0$, equals $\dot{\theta }{n}_B$ for a spatially homogeneous current, it is usually argued that this term implies a splitting in the energy of baryons and antibaryons thereby providing an effective chemical potential for baryon number. In thermal equilibrium, one {then obtains} $n_B\sim \dot{\theta }{T}^2$. We however argue that a term of this form in the Lagrangian does not contribute to the single particle energies of baryons and antibaryons. We show this for both fermionic and scalar baryons. But, similar to some recent work, we find that despite the above result the baryon number density obtained from a Boltzmann equation analysis can be proportional to $\dot{\theta }{T}^2$. Our arguments are very different from that in the standard literature on spontaneous baryogenesis.

    hep-phastro-ph.COhep-thPRD(2018)·14 citations
13. 13*

    ${ϵ}_K$ and ${ϵ}^{\prime }/ϵ$ in a diquark model

    Chuan-Hung Chen🇹🇼 · Takaaki Nomura🇰🇷

    Based on the calculations using the lattice QCD by RBC-UKQCD collaboration and a large $N_c$ dual QCD, the resulted ${ϵ}^{\prime }/ϵ$, which is less than the experimental data by more than a $2\sigma$ in the standard model (SM), suggests the necessity of a new physics effect. In order to complement the insufficient ${ϵ}^{\prime }/ϵ$, we study the extension of the SM with a colored scalar in a diquark model. In addition to the pure diquark box diagrams, it is found that the box diagrams with one $W$-boson and one diquark, ignored in the literature, play an important role in the $\Delta S=2$ process. The mass difference between $K_L$ and $K_S$ in the diquark model is well below the current data, whereas the Kaon indirect CP violation ${ϵ}_K$ gives a strict constraint on the new parameters. Three mechanisms are classified in the study of ${ϵ}^{\prime }/ϵ$, and they include: tree-level diagram, QCD and electroweak penguins, and chromomagnetic dipole. Taking the Kobayashi-Maskawa phase as the unique CP source, we analyze each contribution of the three mechanisms in detail and conclude that these diquark-mediated effects can singly enhance ${ϵ}^{\prime }/ϵ$ to be of $\mathcal{O}(10^{-3})$, depending on the values of free parameters, when the bound from ${ϵ}_K$ is satisfied.

    hep-phhep-exJHEP(2019)·13 citations
14. 14*

    Axion emission and detection from a Galactic supernova

    Pierluca Carenza (Univ. Bari)🇮🇹 · Giampaolo Co' (Univ. Salento, Lecce)🇮🇹 · Tobias Fischer (Wroclaw Univ.)🇵🇱 · Maurizio Giannotti (Barry Univ., Miami)🇺🇸 · Alessandro Mirizzi (Bari Univ. & INFN Bari)🇮🇹 · Thomas Rauscher (Basel Univ. & Hertfordshire Univ., Hatfield)🇬🇧

    A Galactic supernova (SN) axion signal would be detected in a future neutrino Mton-class water Cherenkov detector, such as the proposed Hyper-Kamiokande in Japan. The main detection channel for axions is absorption on the oxygen nuclei in the water. The subsequent oxygen de-excitation leads to a potentially detectable gamma signal. In this contribution we present a calculation of the SN axion signal and discuss its detectability in Hyper-Kamiokande.

    hep-phastro-ph.SR4 citations
15. 15*

    Anapole Dark Matter after DAMA/LIBRA-phase2

    Sunghyun Kang🇰🇷 · Stefano Scopel🇰🇷 · Gaurav Tomar🇰🇷 · Jong-Hyun Yoon (Sogang U.)🇰🇷 · Paolo Gondolo (Utah U.)🇺🇸

    We re-examine the case of anapole dark matter as an explanation for the DAMA annual modulation in light of the DAMA/LIBRA-phase2 results and improved upper limits from other DM searches. If the WIMP velocity distribution is assumed to be a Maxwellian, anapole dark matter is unable to provide an explanation of the DAMA modulation compatible with the other searches. Nevertheless, anapole dark matter provides a better fit to the DAMA-phase2 modulation data than an isoscalar spin-independent interaction, due to its magnetic coupling with sodium targets. A halo-independent analysis shows that explaining the DAMA modulation above 2 keVee in terms of anapole dark matter is basically impossible in face of the other null results, while the DAMA/LIBRA-phase2 modulation measurements below 2 keVee are marginally allowed. We conclude that in light of current measurements, anapole dark matter does not seem to be a viable explanation for the totality of the DAMA modulation.

    hep-phastro-ph.COJCAP(2018)·23 citations
16. 16*

    A minimal $U(1{)}^{\prime }$ extension of MSSM in light of the B decay anomaly

    Guang Hua Duan🇨🇳 · Xiang Fan🇨🇳 · Mariana Frank🇨🇦 · Chengcheng Han🇯🇵 · Jin Min Yang🇨🇳

    Motivated by the $R_K$ and $R_{K^{\ast }}$ anomalies from B decays, we extend the minimal supersymmetric model with a non-universal anomaly-free $U(1{)}^{\prime }$ gauge symmetry, coupling non-universally to the lepton sector as well as the quark sector. In particular, only the third generation quarks are charged under this $U(1{)}^{\prime }$, which can easily evade the dilepton bound from the LHC searches. An extra singlet is introduced to break this $U(1{)}^{\prime }$ symmetry allowing for the $\mu$-term to be generated dynamically. The relevant constraints of $B_s-{\bar{B}}_s$ mixing, $D^0-{\bar{D}}^0$ mixing and the LHC dilepton searches are considered. We find that in the allowed parameter space this $U(1{)}^{\prime }$ gauge interaction can accommodate the $R_K$ and $R_{K^{\ast }}$ anomalies and weaken considerably the $Z^{\prime }$ mass limits while remaining perturbative up to the Planck scale.

    hep-phPLB(2019)·48 citations
17. 17*

    Theoretical analysis of the $\gamma {\gamma }^{(\ast )}\to {\pi }^0\eta$ process

    Oleksandra Deineka🇩🇪 · Igor Danilkin🇩🇪 · Marc Vanderhaeghen🇩🇪

    The theoretical analysis of the $\gamma \gamma \to {\pi }^0\eta$ process is presented within the energy range up to 1.4 GeV. The $S$-wave resonance $a_0(980)$ is described involving the coupled channel dispersive framework and the $D$-wave $a_2(1320)$ is approximated as a Breit-Wigner resonance. For the $a_0(980)$ the pole is found on the IV Riemann sheet resulting in a two-photon decay width of ${\Gamma }_{a_0\to \gamma \gamma }=0.27(4)$ keV. The first dispersive prediction is provided for the single-virtual $\gamma {\gamma }^{\ast }(Q^2)\to {\pi }^0\eta$ process in the spacelike region up to $Q^2=1$ GeV${}^2$.

    hep-phEPJ Web Conf.(2019)·9 citations
18. 18*

    Probing New Physics From TXS 0506+056 Blazar Neutrinos

    Adil Belhaj · Salah Eddine Ennadifi

    Supported by the recent detection of a TXS 0506+056 blazar neutrino with an energy in the TeV-PeV range detected by the IceCube experiment, a probe of a new physics scale LNP related to high-energy cosmic neutrinos is provided. At Standard Model energies, the effect of the underlying physics LNP is first investigated. Then, the recorded IceCube-170922A data is used to approach the scale of such a new physics which lies under the Grand Unified Theory scale 10^25eV.

    hep-phEur.Phys.J.Plus(2022)·0 citations
19. 19*

    Topological terms in Composite Higgs Models

    Joe Davighi🇬🇧 · Ben Gripaios🇬🇧

    We apply a recent classification of topological action terms to Composite Higgs models based on a variety of coset spaces $G/H$ and discuss their phenomenology. The topological terms, which can all be obtained by integrating (possibly only locally-defined) differential forms, come in one of two types, with substantially differing consequences for phenomenology. The first type of term (which appears in the minimal model based on $SO(5)/SO(4)$) is a field theory generalization of the Aharonov-Bohm phase in quantum mechanics. The phenomenological effects of such a term arise only at the non-perturbative level, and lead to $P$ and $CP$ violation in the Higgs sector. The second type of term (which appears in the model based on $SO(6)/SO(5)$) is a field theory generalization of the Dirac monopole in quantum mechanics and has physical effects even at the classical level. Perhaps most importantly, measuring the coefficient of such a term can allow one to probe the structure of the underlying microscopic theory. A particularly rich topological structure, with 6 distinct terms, is uncovered for the model based on $SO(6)/SO(4)$, containing 2 Higgs doublets and a singlet. Of the corresponding couplings, one is an integer and one is a phase.

    hep-phhep-thJHEP(2018)·17 citations
20. 20*

    Collider signature of $U_1$ Leptoquark and constraints from $b\to c$ observables

    Aritra Biswas🇮🇳 · Dilip Kumar Ghosh🇮🇳 · Nivedita Ghosh🇮🇳 · Avirup Shaw🇮🇳 · Abhaya Kumar Swain🇮🇳

    One of the most popular models that is known to be able to solve the lepton flavour universality violating charged ($b\to c$) and neutral current ($b\to s$) anomalies is the Leptoquark Model. In this work we examine the {\it multijet} + $\text{mET}$ collider signature of a vector leptoquark ($U_1$) which has the potential to mediate both the charged and neutral current processes at tree level. From our collider analysis we derive the exclusion limits on mass for the $U_1$ leptoquark at 95\% C.L. at the current and future experiment of the Large Hadron Collider. We also calculate the effect of such a leptoquark in $b\to c$ observables.

    hep-phJ.Phys.G(2020)·38 citations
21. 21*

    Strange matter and kaon to pion ratio in SU(3) PNJL model

    A. V. Friesen🇷🇺 · Yu. L. Kalinovsky🇷🇺 · V. D. Toneev🇷🇺

    The behavior of strange matter in the frame of the SU(3)Polyakov-loop extended Nambu-Jona-Lasinio model including $U_A(1)$ anomaly is considered. We discuss the appearance of a peak in the ratio of the number of strange mesons to non-strange mesons known as the "horn". The PNJL model gives a schematic description of the chiral phase transition and meson properties at finite temperature and density. Using the model, we can show that the splitting of kaon and anti-kaon masses appears as a result of introduction of density. This may explain the difference in the $K^{+}/{\pi }^{+}$ ratio and $K^{-}/{\pi }^{-}$ ratio at low $\sqrt{s_{NN}}$ and their tendency to the same value at high $\sqrt{s_{NN}}$. We also show that the rise in the ratio $K^{+}/{\pi }^{+}$ appears near CEP when we build the $K^{+}/{\pi }^{+}$ ratio along the phase transition diagram and it can be considered as a critical region signal.

    hep-phnucl-thPRC(2019)·11 citations
22. 22*

    Lowest-order electron-electron and electron-muon scattering in a strong magnetic field

    Abhishek Tiwari🇮🇳 · Binoy Krishna Patra🇮🇳

    In this work we have investigated how the much studied scattering processes in vacuum at the lowest-order, {\em viz.} electron-muon ($e$-$\mu$) scattering in both $s$- and $t$-channel, Bhabha scattering, and Møller scattering, have been modified in the presence of a strong magnetic field ($|eB|>>m^2$, $m$ is the mass of electron or muon). For that purpose, we have first calculated the square of the matrix element by summing over the spin states, using the spinors in the presence of a strong magnetic field and then obtain the crosssection by integrating over the available phase space for the final states and averaging over the initial states. The first noticeable observation in the spin-summed of the matrix element squared is that the interference term between $s$- and $t$-channel and $t$- and $u$-channel in Bhabha and Møller scattering, respectively are missing in the presence of strong magnetic field. We have found that in the presence of strong magnetic field, the crosssection of $e^{-}{e}^{+}\to {\mu }^{-}{\mu }^{+}$ annihilation process in the lowest order decreases inversely proportional to the fourth power of the center-of-mass energy ($\sqrt{s}$), compared to the inversely proportional to the square of center-of-mass energy in vacuum alone. Like in vacuum, the crosssection for $e$-$\mu$ scattering in $\mathrm{t}$ channel, {\em i.e.} for $e^{-}{\mu }^{-}\to e^{-}{\mu }^{-}$ process, even in a strong magnetic field too diverges but the finite part decreases with $\sqrt{s}$ much faster than in vacuum alone. Similarly the crosssections for both Bhabha and Møller scattering at the lowest-order diverges in the infrared limit. However, the finite term decreases with $\sqrt{s}$ much faster than the vacuum alone. In addition there is finite negative contribution, which is independent of $\sqrt{s}$ and decreases with the magnetic field.

    hep-phnucl-th6 citations
23. 23*

    Heavy Neutral Leptons and displaced vertices at LHC

    Xabier Marcano🇫🇷

    Heavy neutral leptons are present in many well-motivated beyond the Standard Model theories, sometimes being accessible at present colliders. Depending on their masses and couplings they could be long-lived and lead to events with displaced vertices, and thus to promising signatures due to low Standard Model background. We revisit the potential of the LHC to discover this kind of new particles via searches for displaced vertices, which can probe masses of few GeV for mixings currently allowed by experimental constraints. We also discuss the importance of considering all the possible production channels, including the production in association with light neutrinos, in order to fully explore this region of the parameter space.

    hep-ph6 citations
24. 24*

    Momentum chromospin classification of the fundamental fermions and bosons

    T. B. Edo🇬🇧

    We present a momentum chromospin scheme, the $\mathsf{KSC}$-{\it framework}, for parametrizing the elementary particles using the underlying connection between their internal symmetries and their electromagnetic field boundaries. The linear momentum (or $\mathsf{K}$) chromospin branch of the framework deals with electric charge information, including the emergence of quantum chromodynamics color from fractional electric charges and its effect on quark confinement, while the angular momentum (or $\mathsf{S}$) chromospin branch of the framework develops the theory of spin to address the issue of three fermion generations.

    hep-ph0 citations
25. 25*

    Dilaton in a cold Fermi gas

    Gordon W. Semenoff🇨🇦

    These are the notes for a lecture which I presented at the International Conference on New Frontiers in Physics in Kolymbari, Crete in July, 2018. They review an idea which posits a phase of a two-dimensional system of cold N-component Fermions which exhibits spontaneously broken approximate scale symmetry when studied in the large N expansion. Near criticality, the phase exhibits anomalously small pressure and large compressibility. Some of the consequences of the approximate scale symmetry, such as the existence of a dilaton and its properties are discussed.

    ↳ cond-mat.quant-gashep-phhep-thquant-ph5 citations
26. 26*

    Meaningful Details: The value of adding baseline dependence to the Neutrino-Dark Matter Effect

    William S. Marks🇳🇿 · Fu-Guang Cao🇳🇿

    The possible effect on the flavour spectra of astronomical neutrinos from a neutrino-dark matter interaction has been investigated for decoherent neutrinos. In this work, we report results calculated for coherent neutrinos. This was done with two different models for the neutrino dark-matter interactions: a flavour state interaction,as for the weak interaction in the Standard Model, and a mass state interaction, which is predicted by certain non-Standard Models (specifically Scotogenic models). It was found that using a coherent analysis dramatically increased the explorable parameter space for the neutrino-dark matter interaction. However, the detection of coherent astronomical neutrinos presents a significant challenge to experimentalists, because such a detection would require an improvement in energy resolution by at least six orders of magnitude, with similar improvements in astronomical distance determinations.

    ↳ astro-ph.HEhep-phInt.J.Theor.Phys.(2020)·2 citations
27. 27*

    Extracting strange quark freeze-out information in Pb+Pb collisions at $\sqrt{s_{NN}}$=2.76 TeV from $\varphi$ and $\Omega$ production

    Jie Pu🇨🇳 · Kai-Jia Sun🇨🇳 · Lie-Wen Chen🇨🇳

    Using a covariant quark coalescence model combined with a blast-wave-like analytical parametrization for (anti-)strange quark phase-space freeze-out configuration, we extract information on strange quark freeze-out dynamics in Pb+Pb collisions at $\sqrt{s_{NN}}$=2.76 TeV by fitting the measured transverse momentum spectra and elliptic flows ($v_2$) of $\varphi$ mesons and $\Omega$ baryons. We find that although both the measured and calculated $v_2$ of $\varphi$ and $\Omega$ satisfy the number-of-constituent-quark (NCQ) scaling, the NCQ-scaled $v_2$ is significantly smaller than the $v_2$ of strange quarks, implying that the NCQ-scaled $v_2$ of $\varphi$ and $\Omega$ cannot be simply identified as the $v_2$ of strange quarks at hadronization. Meanwhile, our results indicate that the covariant quark coalescence model can nicely describe the spectra and elliptic flows of $\varphi$ and $\Omega$ simultaneously, suggesting the coalescence mechanism is still valid for $\varphi$ and $\Omega$ production in Pb+Pb collisions at LHC energies.

    ↳ nucl-thhep-phnucl-exPRC(2018)·5 citations
28. 28*

    Tetraquarks and pentaquarks

    Greig Cowan🇬🇧 · Tim Gershon🇬🇧

    Greig Cowan and Tim Gershon describe new types of matter called tetraquarks and pentaquarks, and discuss the outlook for understanding these particles.

    ↳ physics.pop-phhep-exhep-ph8 citations
29. 29*

    Inflation with an antisymmetric tensor field

    Sandeep Aashish🇮🇳 · Abhilash Padhy🇮🇳 · Sukanta Panda🇮🇳 · Arun Rana🇮🇳

    We investigate the possibility of inflation with models of antisymmetric tensor field having minimal and nonminimal couplings to gravity. Although the minimal model does not support inflation, the nonminimal models, through the introduction of a nonminimal coupling to gravity, can give rise to stable de-Sitter solutions with a bound on the coupling parameters. The values of field and coupling parameters are sub-planckian. Slow roll analysis is performed and slow-roll parameters are defined which can give the required number of e-folds for sufficient inflation. Stability analysis has been performed for perturbations to antisymmetric field while keeping the metric unperturbed, and it is found that only the sub-horizon modes are free of ghost instability for de-Sitter space.

    ↳ gr-qcastro-ph.COhep-phhep-thEPJC(2018)·33 citations
30. 30*

    High-energy neutrino flare from cloud-jet interaction in the blazar PKS 0502+049

    Hao-Ning He🇨🇳 · Yoshiyuki Inoue🇯🇵 · Susumu Inoue🇯🇵 · Yun-Feng Liang🇨🇳

    Following the detection of a $\sim$300 TeV neutrino potentially associated with the flaring blazar TXS 0506+056, an excess of neutrinos around its position in 2014-2015 was revealed by IceCube. However, its contemporaneous quiescence in $\gamma$-rays is challenging to interpret consistently. Meanwhile, the blazar PKS 0502+049, positioned within the neutrino localization uncertainties, was seen to be flaring in $\gamma$-rays. We show that dense, line-emitting gas clouds that interact with its jet and induce cosmic ray acceleration and hadronuclear interaction can plausibly explain the 2014-2015 neutrino flare.

    ↳ astro-ph.HEhep-ph12 citations
31. 31*

    Walking, Weak first-order transitions, and Complex CFTs II. Two-dimensional Potts model at $Q>4$

    Victor Gorbenko🇺🇸 · Slava Rychkov🇫🇷 · Bernardo Zan🇨🇭

    We study complex CFTs describing fixed points of the two-dimensional $Q$-state Potts model with $Q>4$. Their existence is closely related to the weak first-order phase transition and walking RG behavior present in the real Potts model at $Q>4$. The Potts model, apart from its own significance, serves as an ideal playground for testing this very general relation. Cluster formulation provides nonperturbative definition for a continuous range of parameter $Q$, while Coulomb gas description and connection to minimal models provide some conformal data of the complex CFTs. We use one and two-loop conformal perturbation theory around complex CFTs to compute various properties of the real walking RG flow. These properties, such as drifting scaling dimensions, appear to be common features of the QFTs with walking RG flows, and can serve as a smoking gun for detecting walking in Monte Carlo simulations. The complex CFTs discussed in this work are perfectly well defined, and can in principle be seen in Monte Carlo simulations with complexified coupling constants. In particular, we predict a pair of $S_5$-symmetric complex CFTs with central charges $c\approx 1.138\pm 0.021i$ describing the fixed points of a 5-state dilute Potts model with complexified temperature and vacancy fugacity.

    ↳ hep-thcond-mat.stat-mechcond-mat.str-elhep-lat+1SciPost Phys.(2018)·169 citations
32. 32*

    Preinflationary dynamics in loop quantum cosmology: Monodromy Potential

    Manabendra Sharma🇨🇳 · M. Shahalam🇨🇳 · Wu Qiang🇨🇳 · Anzhong Wang🇺🇸

    In this article we explore the pre-inflationary background dynamics of an FLRW universe sourced by a scalar field with monodromy potential in LQC framework. In particular we calculate the number of e-folds, $N_{inf}$, produced during the slowly rolling phase of the inflation and find out the critical value of the ratio of the kinetic to potential energy, $r_w^c$, at the quantum bounce that is required to produce $N_{inf}\simeq 60.$ Two different monodromy potentials, namely, linear and quadratic with a modulation term are investigated to this effect. The effects on the value of $N_{inf}$ due to parameters associated with the strength, decay constant and the phase factor of the modulation term are calculated. In addition to this we present the qualitative picture of the background dynamics by carrying out a dynamical system analysis. We produce the phase portraits and carry out a detailed linear stability analysis of the finite fixed points, if any, for each of the potentials.

    ↳ gr-qchep-phhep-thJCAP(2018)·37 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.