Fri·Aug 31, 2018Friday·August 31, 2018

1. 01*

   Revisiting Supernova 1987A Limits on Axion-Like-Particles

   Jun Seok Lee🇺🇸

   Using recent supernova models, I revisit the Supernova 1987a constraints on scalar/pseudoscalar Axion-Like-Particles (ALPs). On the basis of the neutrino detections, the luminosity of ALPs must be $\lesssim 5\times 10^{52}\mathrm{erg}/s$ after the core-bounce, and this bound limits ALPs couplings. Contrary to the QCD axion models where all couplings are $\sim 1/f_a$, it has been shown recently that a radion/dilaton could have far different coupling strength to photons and to nucleons. This fact has raised a need to establish the limits on each coupling independently. The bounds from ALPs emission by nucleon-nucleon bremsstrahlung through a two-nucleon coupling and by the Primakoff process through a two-photon coupling are updated considering the total volume emission. I find the bounds on the two-photon coupling from the Primakoff process differ from previous bounds by an order of magnitude. Through the volume emission study, trapping regimes for $m_a\gtrsim 10\mathrm{MeV}$ are also alleviated, which need to be probed by future experiments.

   hep-ph70 citations
2. 02*

   A model of light dark matter and dark radiation

   Deog Ki Hong🇰🇷

   We propose a model for dark matter and dark radiation, based on a strongly-coupled dark $\mathrm{SU}(5)$ gauge theory with fundamental and decuplet dark-quarks. The model supports light dark-baryons, respecting the chiral symmetry, which are electrically neutral but have electromagnetic form factors, and also a light dark-axion. Since the coupling of dark baryons to the standard model particles is inversely proportional to the square of the confinement scale, dark baryons become either hot dark matter or cold dark matter, depending on when the dark color confines. For the confinement scale $\Lambda \sim 10-10^3\mathrm{GeV}$ the dark baryons of mass about $1\mathrm{GeV}-1\mathrm{MeV}$ become cold dark matter with naturally small magnetic moment and give the correct relic abundance.

   hep-phastro-ph.COhep-thJ.Korean Phys.Soc.(2021)·2 citations
3. 03*

   Models with higher weak-isospin Higgs multiplets

   Cheng-Wei Chiang🇹🇼 · Kei Yagyu🇯🇵

   In order for scale factors ${\kappa }_V^{}(V=W,Z)$ of the 125-GeV Higgs boson couplings to have the possibilities of being greater than unity and ${\kappa }_W^{}\ne {\kappa }_Z^{}$ while keeping the electroweak $\rho$ parameter unity at tree level, the Higgs sector must be extended with at least two exotic $SU(2{)}_L$ multiplets in addition to the doublet Higgs field in the Standard Model. By the requirements of perturbative unitarity, no Landau pole in gauge couplings, and no accidental global $U(1)$ symmetry, we exhaust all the possible combinations of two exotic Higgs fields and derive general formulas for ${\kappa }_V^{}$. We find that the current central values ${\kappa }_W^{}=1.12$ and ${\kappa }_Z=0.99$ reported by CMS can be accommodated in the model with a complex and a real Higgs triplets as the simplest example.

   hep-phPLB(2018)·6 citations
4. 04*

   Vacuum misalignment and pattern of scalar masses in the SU(5)/SO(5) composite Higgs model

   Alessandro Agugliaro🇮🇹 · Giacomo Cacciapaglia🇫🇷 · Aldo Deandrea🇫🇷 · Stefania De Curtis🇮🇹

   Composite Higgs models based on SU(5)/SO(5) are characterised by the presence of custodial triplets, like the Georgi-Machacek model. We classify all the operators giving rise to the top mass and Higgs potential in presence of fermion partial compositeness, with top partners in two-index representations of SU(5). A detailed study of each operator allows us to find correlations in the couplings of Higgs and non-Higgs pseudo-Nambu-Goldstone bosons, which depend only on one, two or three independent parameters. We also analyse the Higgs potential, finding that a misalignment along the custodial invariant triplet direction is forbidden by CP conservation. Avoiding custodial breaking allows us to select a handful of feasible models, which feature universal patterns in the scalar masses related to their transformation properties under the custodial symmetry. Finally, we briefly study the LHC phenomenology of the scalars, which are always below 1 TeV even for multi-TeV condensation scales, and find promising same-sign lepton final states enriched by hard photons.

   hep-phJHEP(2019)·51 citations
5. 05*

   New physics implication of Higgs precision measurements

   Ning Chen🇨🇳 · Jiayin Gu🇩🇪 · Tao Han🇺🇸 · Honglei Li🇨🇳 · Zhen Liu🇺🇸 · Huayang Song🇺🇸 · Shufang Su🇺🇸 · Wei Su🇦🇺 · Yongcheng Wu🇨🇦 · Jin Min Yang🇨🇳

   Studying the properties of the Higgs boson can be an important window to explore the physics beyond the Standard Model (SM). In this work, we present studies on the implications of the Higgs precision measurements at future Higgs Factories. We perform a global fit to various Higgs search channels to obtain the 95 % C.L. constraints on the model parameter spaces of Two Higgs Double Model (2HDM) and Minimal Supersymmetric Standard Model (MSSM). In the 2HDM, we analyze tree level effects as well as one-loop contributions from the heavy Higgs bosons. The strong constraints on $\cos (\beta -\alpha )$, heavy Higgs masses and their mass splitting are complementary to direct search of the LHC as well as possible future Z pole precision measurements. For the MSSM, we study both the Higgs couplings and mass precisions. The constraints on the CP-odd Higgs mass $m_A$ and stop mass scale $m_{SUSY}$ can be complementary to the direct search of HL-LHC. We also compare the sensitivity of various future Higgs factories, namely Circular Electron Positron Collider (CEPC), Future Circular Collider (FCC)-ee and International Linear Collider (ILC).

   hep-phInt.J.Mod.Phys.A(2019)·6 citations
6. 06*

   Reinterpreting the weak mixing angle from atomic parity violation in view of the Cs neutron rms radius measurement from COHERENT

   Matteo Cadeddu🇮🇹 · Francesca Dordei🇮🇹

   Using the model independent average neutron rms radius of ${}^{133}\text{Cs}$ and ${}^{127}\text{I}$ obtained from the analysis of the coherent elastic neutrino-nucleus scattering data of the COHERENT experiment, we remove the long-standing $1.5\sigma$ tension between the Standard Model prediction and the weak mixing angle measurement from the atomic parity violation (APV) in caesium. The updated APV result becomes ${\sin }^2{\vartheta }_{\text{W}}=0.239{}_{-0.007}^{+0.006}$, to be compared with the Standard Model prediction at low momentum transfer, ${\sin }^2{\vartheta }_{\text{W}}^{\text{SM}}=0.23857(5)$. Moreover, exploiting the fact that the APV result is highly sensitive to the caesium neutron rms radius, $R_n$, and assuming that the Standard Model is correct, we combine the APV and the COHERENT measurements in order to get a better determination of $R_n$. The value of $R_n=5.42\pm 0.31\text{fm}$ is obtained, improving significantly the current uncertainty. This result allows to infer a meaningful value of the caesium neutron skin, the difference between the neutron and proton distribution radii, equal to $\Delta R_{np}=0.62\pm 0.31\text{fm}$, showing for the first time a $2\sigma$ deviation from zero.

   hep-phnucl-thPRD(2019)·78 citations
7. 07*

   Single Higgs production in association with a photon at electron-positron colliders in extended Higgs models

   Shinya Kanemura🇯🇵 · Kentarou Mawatari🇯🇵 · Kodai Sakurai🇯🇵

   We study associated Higgs production with a photon at electron-positron colliders, $e^{+}{e}^{-}\to h\gamma$, in various extended Higgs models, such as the inert doublet model (IDM), the inert triplet model (ITM) and the two Higgs doublet model (THDM). The cross section in the standard model (SM) is maximal around $\sqrt{s}=$250 GeV, and we present how and how much the new physics can enhance or reduce the production rate. We also discuss the correlation with the $h\to \gamma \gamma$ and $h\to Z\gamma$ decay rates. We find that, with a sizable coupling to a SM-like Higgs boson, charged scalars can give considerable contributions to both the production and the decay if their masses are around 100 GeV. Under the theoretical constraints from vacuum stability and perturbative unitarity as well as the current constraints from the Higgs measurements at the LHC, the production rate can be enhanced from the SM prediction at most by a factor of two in the IDM. In the ITM, in addition, we find a particular parameter region where the $h\gamma$ production significantly increases by a factor of about six to eight, but the $h\to \gamma \gamma$ decay still remains as in the SM. In the THDM, possible deviations from the SM prediction are minor in the viable parameter space.

   hep-phPRD(2019)·23 citations
8. 08*

   Seeking leptoquarks in the $\mathbf{t}\bar{\mathbf{t}}$ plus missing energy channel at the high-luminosity LHC

   Natascia Vignaroli🇮🇹

   The $t\bar{t}$ plus missing energy channel is one of the most efficient to detect third-generation leptoquarks (LQs). It offers an important test to models which explain flavor anomalies in $B$ meson decays. We outline a search strategy in the channel, relying on tagging the tops and on observables constructed out of the tops, and we assess the reach on LQs of the future high-luminosity LHC program. We find that with 3 ab${}^{-1}$ a vector (scalar) LQ decaying 50% (100%) to top and neutrino can be excluded up to masses of 1.96 TeV (1.54 TeV). We also indicate several observables that, in case of a future discovery in the channel, can be used to distinguish a scalar LQ from a vector LQ. The implications of our findings to models addressing the recent flavor anomalies are finally discussed.

   hep-phhep-exPRD(2019)·23 citations
9. 09*

   Axion-Like Particles at Future Colliders

   Martin Bauer🇩🇪 · Mathias Heiles🇩🇪 · Matthias Neubert🇩🇪 · Andrea Thamm🇨🇭

   Axion-like particles (ALPs) are pseudo Nambu-Goldstone bosons of spontaneously broken global symmetries in high-energy extensions of the Standard Model (SM). This makes them a prime target for future experiments aiming to discover new physics which addresses some of the open questions of the SM. While future high-precision experiments can discover ALPs with masses well below the GeV scale, heavier ALPs can be searched for at future high-energy lepton and hadron colliders. We discuss the reach of the different proposed colliders, focusing on resonant ALP production, ALP production in the decay of heavy SM resonances, and associate ALP production with photons, Z bosons or Higgs bosons. We consider the leading effective operators mediating interactions between the ALP and SM particles and discuss search strategies for ALPs decaying promptly as well as ALPs with delayed decays. Projections for the high-luminosity run of the LHC and its high-energy upgrade, CLIC, the future $e^{+}{e}^{-}$ ring-colliders CEPC and FCC-ee, the future pp colliders SPPC and FCC-hh, and for the MATHUSLA surface array are presented. We further discuss the constraining power of future measurements of electroweak precision parameters on the relevant ALP couplings.

   hep-phEPJC(2019)·274 citations
10. 10*

    Gauge Coupling Unification without Supersymmetry

    Jakob Schwichtenberg🇩🇪

    We investigate the prospects to achieve unification of the gauge couplings in models without supersymmetry. We restrict our discussion to $SU(5),SO(10)$ and $E_6$ models that mimic the structure of the Standard Model as much as possible ("conservative models"). One possible reason for the non-unification of the standard model gauge couplings are threshold corrections which are necessary when the masses of the superheavy fields are not exactly degenerate. We calculate the threshold corrections in conservative models with a Grand Desert between the electroweak and the unification scale. We argue that only in conservative $E_6$ models the corrections can be sufficiently large to explain the mismatch and, at the same time, yield a long-enough proton lifetime. A second possible reason for the mismatch are particles at an intermediate scale. We therefore also study systematically the impact of additional light scalars, gauge bosons and fermions on the running of the gauge coupling. We argue that for each of these possibilities there is a viable scenario with just one intermediate scale.

    hep-phEPJC(2019)·28 citations
11. 11*

    An extended locally constant field approximation for nonlinear Compton scattering

    A. Ilderton🇬🇧 · B. King🇬🇧 · D. Seipt🇬🇧

    The locally constant field approximation (LCFA) has to date underpinned the numerical simulation of quantum processes in laser-plasma physics and astrophysics, but its validity has recently been questioned in the parameter regime of current laser experiments. While improvements are needed, literature corrections to the LCFA show inherent problems. Using nonlinear Compton scattering in laser fields to illustrate, we show here how to overcome the problems in LCFA corrections. We derive an "LCFA+" which, comparing with the full QED result, shows an improvement over the LCFA across the whole photon emission spectrum. We also demonstrate an implementation of our results in the type of numerical code used to design and analyse intense laser experiments.

    hep-phphysics.atom-phphysics.plasm-phPRA(2019)·145 citations
12. 12*

    Valence Quark Transversity at Small $x$

    Yuri V. Kovchegov🇺🇸 · Matthew D. Sievert🇺🇸

    In our previous work we established a formalism which allows one to determine the small-$x$ asymptotics of any transverse momentum-dependent parton distribution function (TMD PDF) of the proton at small values of strong coupling. In this paper we apply this formalism to the valence quark transversity TMD. We relate the valence quark transversity to the transversely polarized dipole scattering amplitude, written in terms of the fundamental transversely-polarized "Wilson line" operator, an expression for which we derive explicitly as well. We then write down the evolution equation for the transversely polarized dipole amplitude. Solving that equation we arrive at the following small-$x$ asymptotics of the valence quark transversity in the large-$N_c$ limit: \begin{align} h_{1T}^v (x, k_T^2) \sim h_{1T}^{\perp \, v} (x, k_T^2) \sim \left( \frac{1}{x} \right)^{-1 + 2 \, \sqrt{\frac{\alpha_s \, N_c}{2 \, \pi}} } . \notag \end{align} This result is in agreement with one of the two possible small-$x$ asymptotics for the transverse structure function found previously by Kirschner, Mankiewicz, Schäfer, and Szymanowski.

    hep-phnucl-thPRD(2019)·52 citations
13. 13*

    The $B^{+}\to J/\psi \omega K^{+}$ reaction and $D^{\ast }{\bar{D}}^{\ast }$ molecular states

    L. R. Dai🇨🇳 · G. Y. Wang🇨🇳 · X. Chen🇨🇳 · E. Wang🇨🇳 · E. Oset🇪🇸 · D. M. Li🇨🇳

    We study the $B^{+}\to J/\psi \omega K^{+}$ reaction, measured by the LHCb collaboration, and show that it is driven by the presence of two resonances, the $X(3940)$ and $X(3930)$, that are of molecular nature and couple most strongly to $D^{\ast }{\bar{D}}^{\ast }$, but also to $J/\psi \omega$. Because of that, in the $J/\psi \omega$ mass distribution we find a peak related to the excitation of the resonances and a cusp with large strength at the $D^{\ast }{\bar{D}}^{\ast }$ threshold.

    hep-phEPJA(2019)·26 citations
14. 14*

    Minimal Spin-one Isotriplet Dark Matter

    Alexander Belyaev🇬🇧 · Giacomo Cacciapaglia🇫🇷 · James McKay🇬🇧 · Dixon Marin🇨🇱 · Alfonso R. Zerwekh🇨🇱

    In this work we present a simple extension of the Standard Model that contains, as the only new physics component, a massive spin-one matter field in the adjoint representation of $SU(2{)}_L$. In order to be consistent with perturbative unitarity, the vector field must be odd under a $Z_2$ symmetry. Radiative corrections make the neutral component of the triplet ($V^0$) slightly lighter than the charged ones. We show that $V^0$ can be the dark matter particle while satisfying all current bounds if it has a mass between $2.8$ and $3.8$ TeV. We present the current limit on the model parameter space from highly complementary experimental constraints including dark matter relic density measurement, dark matter direct and indirect detection searches, LHC data on Higgs couplings to photons and LHC data on disappearing track searches. We show that the two-dimensional parameter space can be substantially covered by disappearing track searches at a future 100 TeV hadron collider, which will probe DM mass upto about 1.2 TeV.

    hep-phPRD(2019)·31 citations
15. 15*

    Global analyses of Higgs portal singlet dark matter models using GAMBIT

    The GAMBIT Collaboration: Peter Athron🇦🇺 · Csaba Balázs🇦🇺 · Ankit Beniwal🇸🇪 · Sanjay Bloor🇬🇧 · José Eliel Camargo-Molina🇬🇧 · Jonathan M. Cornell🇨🇦 · Ben Farmer🇬🇧 · Andrew Fowlie🇦🇺 · Tomás E. Gonzalo🇳🇴 · Felix Kahlhoefer🇩🇪 · Anders Kvellestad🇬🇧 · Gregory D. Martinez🇺🇸 and 5 other authors

    We present global analyses of effective Higgs portal dark matter models in the frequentist and Bayesian statistical frameworks. Complementing earlier studies of the scalar Higgs portal, we use GAMBIT to determine the preferred mass and coupling ranges for models with vector, Majorana and Dirac fermion dark matter. We also assess the relative plausibility of all four models using Bayesian model comparison. Our analysis includes up-to-date likelihood functions for the dark matter relic density, invisible Higgs decays, and direct and indirect searches for weakly-interacting dark matter including the latest XENON1T data. We also account for important uncertainties arising from the local density and velocity distribution of dark matter, nuclear matrix elements relevant to direct detection, and Standard Model masses and couplings. In all Higgs portal models, we find parameter regions that can explain all of dark matter and give a good fit to all data. The case of vector dark matter requires the most tuning and is therefore slightly disfavoured from a Bayesian point of view. In the case of fermionic dark matter, we find a strong preference for including a CP-violating phase that allows suppression of constraints from direct detection experiments, with odds in favour of CP violation of the order of 100:1. Finally, we present DDCalc 2.0.0, a tool for calculating direct detection observables and likelihoods for arbitrary non-relativistic effective operators.

    hep-phastro-ph.COEPJC(2019)·155 citations
16. 16*

    Heavy baryons in the chiral quark-soliton model: a possibility for exotica?

    Michal Praszalowicz🇵🇱

    We discuss possible interpretation of five excited ${\Omega }_c^0$ states within the Chrial Quark Soliton Model. We show that it is not possible to interpret all five ${\Omega }_c^0$'s as parity minus excitations and argue that two narrowest states are pentaquarks belonging to the SU(3) representation $\overline{15}$.

    hep-phActa Phys.Polon.Supp.(2018)·0 citations
17. 17*

    QED Plasma at Finite Temperature up to Two Loops

    Samina S Masood🇺🇸

    We study the vacuum polarization tensor of QED (quantum electrodynamics) at high temperatures up to the two loop levels and its effect on the electromagnetic properties of a medium. One loop corrections to QED coupling vanish at low temperatures (T$\le 10^{10}K$), but they play an important role at high temperature ( T$\ge 10^{10}$ K) to study the behavior of QED medium at these temperatures. At low temperatures ( $T\le m_e$)higher order loops give a tiny correction due to the coupling of radiation with matter and an overlap of hot photon loop with cold fermion loop contributes to this effect. These higher loop contributions does not affect the convergence of perturbative series, and renormalizability of QED is guaranteed at temperatures around neutrino decoupling. We use the renormalization scheme of QED at finite temperature in real-time formalism to study the dynamically generated mass of photon indicating the plasmon production in such a medium. Temperature dependence of this QED plasma parameters is discussed. We explicitly show that this behavior of a thermal medium exists upto temperatures of a few MeV only. We compare the first order and second order effects upto the 4MeV temperature and demonstrate that the higher order contributions are smaller than the lower order contributions proving the renormalizability of the theory. The lowest order contributions are sufficiently smaller than the original value as well.

    hep-phastro-ph.HEphysics.plasm-ph3 citations
18. 18*

    Magnetoelectric effect in cylindrical topological insulators

    A. Martín-Ruiz🇪🇸

    Topological insulators (TIs) exhibit a quantized magnetoelectric response when time-reversal symmetry is broken on its surface. This unusual electromagnetic (EM) response is a unique macroscopic manifestation of the quantum Hall effect on the TI surface and it is described by a quantized Chern-Simons theory. In this paper, we construct the Green's function (GF) describing the EM response of two topological media separated by a cylindrical interface. This GF, in the appropriate limits, describes the magnetoelectric effect of both i) a cylindrical TI surrounded by a dielectric fluid, and ii) a TI with a cylindrical dielectric-filled cavity. We calculate the EM fields produced by a line charge and a line current near the TI surface and we show that, in addition to the standard image electromagnetic sources, charge and current densities of magnetic monopoles will also appear. We discuss some experimental setups which could be used to test these magnetic monopole fields.

    ↳ cond-mat.mes-hallhep-phPRD(2018)·23 citations
19. 19*

    In-Medium Charmonium Production in Proton-Nucleus Collisions

    Xiaojian Du🇺🇸 · Ralf Rapp🇺🇸

    We study charmonium production in proton-nucleus ($p$-A) collisions focusing on final-state effects caused by the formation of an expanding medium. Toward this end, we utilize a rate equation approach within a fireball model as previously employed for a wide range of heavy-ion collisions, adapted to the small systems in $p$-A collisions. The initial geometry of the fireball is taken from a Monte-Carlo event generator where initial anisotropies are caused by fluctuations. We calculate the centrality and transverse-momentum dependent nuclear modification factor ($R_{p\mathrm{A}}$) as well as elliptic flow ($v_2$) for both $J/\psi$ and $\psi (2S)$ and compare them to experimental data from RHIC and the LHC. While the $R_{p\mathrm{A}}$s show an overall fair agreement with most of the data, the large $v_2$ values observed in $p$-Pb collisions at the LHC cannot be accounted for in our approach. While the former finding generally supports the formation of a near thermalized QCD medium in small systems, the discrepancy in the $v_2$ suggests that its large observed values are unlikely to be due to the final-state collectivity of the fireball alone.

    ↳ nucl-thhep-phnucl-exJHEP(2019)·80 citations
20. 20*

    The General 3-Graviton Vertex ($TTT$) of Conformal Field Theories in Momentum Space in $d=4$

    Claudio Coriano🇮🇹 · Matteo Maria Maglio🇮🇹

    We present a study of the correlation function of three stress-energy tensors in $d$ dimensions using free field theory realizations, and compare them to the exact solutions of their conformal Ward identities (CWI's) obtained by a general approach in momentum space. The identification of the corresponding form factors is performed within a reconstruction method, based on the identification of the transverse traceless components $(A_i)$ of the same correlator. The solutions of the primary CWI' s are found by exploiting the universality of the Fuchsian indices of the conformal operators and a re-arrangement of the corresponding inhomogenous hypergeometric systems. We confirm the number of constants in the solution of the primary CWI's of previous analysis. In our comparison with perturbation theory, we discuss scalar, fermion and spin 1 exchanges at 1-loop in dimensional regularization. Explicit checks in $d=3$ and $d=5$ prove the consistency of this correspondence. By matching the 3 constants of the CFT solution with the 3 free field theory sectors available in d=4, the general solutions of the conformal constraints is expressed just in terms of ordinary scalar 2- and 3-point functions $(B_0,C_0)$. We show how the renormalized $d=4$ TTT vertex separates naturally into the sum of a traceless and an anomaly part, the latter determined by the anomaly functional and generated by the renormalization of the correlator in dimensional regularization. The result confirms the emergence of anomaly poles and effective massless exchanges as a specific signature of conformal anomalies in momentum space, directly connected to the renormalization of the corresponding gravitational vertices, generalizing the behaviour found for the $TJJ$ vertex in previous works.

    ↳ hep-thhep-phNPB(2018)·47 citations
21. 21*

    Phenomenology of Quantum Reduced Loop Gravity in the isotropic cosmological sector

    Emanuele Alesci🇺🇸 · Aurélien Barrau🇫🇷 · Gioele Botta🇵🇱 · Killian Martineau🇫🇷 · Gabriele Stagno🇮🇹

    Quantum reduced loop gravity is designed to consistently study symmetry reduced systems within the loop quantum gravity framework. In particular, it bridges the gap between the effective cosmological models of loop quantum cosmology and the full theory, addressing the dynamics before the minisuperspace reduction. This mostly preserves the graph structure and SU(2) quantum numbers. In this article, we study the phenomenological consequences of the isotropic sector of the theory, the so-called emergent bouncing universe model. In particular, the parameter space is scanned and we show that the number of inflationary e-folds is almost always higher than the observational lower-bound. We also compute the primordial tensor power spectrum and study its sensitivity upon the fundamental parameters used in the model.

    ↳ gr-qcastro-ph.COhep-phPRD(2018)·21 citations
22. 22*

    Pions in magnetic field at finite temperature

    Shijun Mao🇨🇳

    Pions in external magnetic field are investigated in the frame of a Pauli-Villars regularized Nambu--Jona-Lasinio model. The meson propagators in terms of quark bubbles in Ritus and Schwinger schemes are analytically derived, and pion masses are numerically calculated in the Ritus scheme. For neutral and charged pions at finite temperature, there exist respectively one and three mass jumps at the corresponding Mott transition points, due to the discrete energy levels of the two constituent quarks in magnetic field.

    ↳ nucl-thhep-phPRD(2019)·65 citations
23. 23*

    Collective flows of $\alpha$-clustering ${}^{12}\mathrm{C}$ + ${}^{197}\mathrm{Au}$ by using different flow analysis methods

    S. Zhang🇨🇳 · Y. G. Ma🇨🇳 · J. H. Chen🇨🇳 · W. B. He🇨🇳 · C. Zhong🇨🇳

    Recently the ratio of triangular flow to the elliptic flow ($v_3/v_2$) of hadrons was proposed as a probe to detect the pattern of $\alpha$-clustering ${}^{12}\mathrm{C}$ in ${}^{12}\mathrm{C}$+${}^{197}\mathrm{Au}$ collisions at relativistic energy by a participant plane method (Phys. Rev. C 95, 064904 (2017)). In experimental event plane method, Q-cumulant method and two-particle correlation method with rapidity gap always were used for measurement of collective flow only by means of momentum space. By comparing collective flow through the different methods, the ratio of $v_3/v_2$ could be taken as an experimental probe to distinguish different $\alpha$-clustering structure of ${}^{12}\mathrm{C}$.

    ↳ nucl-thhep-phnucl-exEPJA(2018)·23 citations
24. 24*

    Baikal-GVD: status and prospects

    Baikal-GVD Collaboration: A.D. Avrorin (1)🇷🇺 · A.V. Avrorin (1)🇷🇺 · V.M. Aynutdinov (1)🇷🇺 · R. Bannash (7)🇩🇪 · I.A. Belolaptikov (2)🇷🇺 · V.B. Brudanin (2)🇷🇺 · N.M. Budnev (3)🇷🇺 · A.A. Doroshenko (1)🇷🇺 · G.V. Domogatsky (1)🇷🇺 · R. Dvornický (2 and 8)🇷🇺 · A.N. Dyachok (3)🇷🇺 · Zh.-A.M. Dzhilkibaev (1)🇷🇺 and 39 other authors

    Baikal-GVD is a next generation, kilometer-scale neutrino telescope under construction in Lake Baikal. It is designed to detect astrophysical neutrino fluxes at energies from a few TeV up to 100 PeV. GVD is formed by multi-megaton subarrays (clusters). The array construction started in 2015 by deployment of a reduced-size demonstration cluster named "Dubna". The first cluster in its baseline configuration was deployed in 2016, the second in 2017 and the third in 2018. The full scale GVD will be an array of ~10000 light sensors with an instrumented volume of about 2 cubic km. The first phase (GVD-1) is planned to be completed by 2020-2021. It will comprise 8 clusters with 2304 light sensors in total. We describe the design of Baikal-GVD and present selected results obtained in 2015-2017.

    ↳ astro-ph.IMhep-exhep-phphysics.ins-detEPJ Web Conf.(2018)·99 citations
25. 25*

    Digitization of Scalar Fields for Quantum Computing

    Natalie Klco🇺🇸 · Martin J. Savage🇺🇸

    Qubit, operator and gate resources required for the digitization of lattice $\lambda {\varphi }^4$ scalar field theories onto quantum computers are considered, building upon the foundational work by Jordan, Lee and Preskill, with a focus towards noisy intermediate-scale quantum (NISQ) devices. The Nyquist-Shannon sampling theorem, introduced in this context by Macridin, Spentzouris, Amundson and Harnik building on the work of Somma, provides a guide with which to evaluate the efficacy of two field-space bases, the eigenstates of the field operator, as used by Jordan, Lee and Preskill, and eigenstates of a harmonic oscillator, to describe $0+1$- and $d+1$-dimensional scalar field theory. We show how techniques associated with improved actions, which are heavily utilized in Lattice QCD calculations to systematically reduce lattice-spacing artifacts, can be used to reduce the impact of the field digitization in $\lambda {\varphi }^4$, but are found to be inferior to a complete digitization-improvement of the Hamiltonian using a Quantum Fourier Transform. When the Nyquist-Shannon sampling theorem is satisfied, digitization errors scale as $|\log |\log |{ϵ}_{\mathrm{dig}}|||\sim n_Q$ (number of qubits describing the field at a given spatial site) for the low-lying states, leaving the familiar power-law lattice-spacing and finite-volume effects that scale as $|\log |{ϵ}_{\mathrm{latt}}||\sim N_Q$ (total number of qubits in the simulation). For localized(delocalized) field-space wavefunctions, it is found that $n_Q\sim 4(7)$ qubits per spatial lattice site are sufficient to reduce theoretical digitization errors below error contributions associated with approximation of the time-evolution operator and noisy implementation on near-term quantum devices.

    ↳ quant-phhep-lathep-phnucl-thPRA(2019)·215 citations
26. 26*

    Abelian-Higgs Cosmic String Evolution with CUDA

    J. R. C. C. C. Correia🇵🇹 · C. J. A. P. Martins🇵🇹

    Topological defects form at cosmological phase transitions by the Kibble mechanism, with cosmic strings and superstrings having the most interesting phenomenology. A rigorous analysis of their astrophysical consequences is limited by the availability of accurate numerical simulations, and therefore by hardware resources and computation time. Improving the speed and efficiency of existing codes is therefore essential. All current cosmic string simulations were performed on Central Processing Units. In previous work we presented a General Purpose Graphics Processing Unit implementation of the evolution of cosmological domain wall networks. Here we continue this paradigm shift and discuss an analogous implementation for local Abelian-Higgs strings networks. We discuss the implementation algorithm (including the discretization used and how to calculate network averaged quantities) and then showcase its performance and current bottlenecks. We validate the code by directly comparing our results for the canonical scaling properties of the networks in the radiation and matter eras with those in the literature, finding very good agreement. We finally highlight possible directions for improving the scalability of the code.

    ↳ physics.comp-phastro-ph.COgr-qchep-phAstron.Comput.(2020)·13 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.