Mon·Dec 31, 2018Monday·December 31, 2018

1. 01*

   Sizable Stop Mixing in Flavored Gauge Mediation Models with Discrete Non-Abelian Symmetries

   Lisa L. Everett🇺🇸 · Todd S. Garon🇺🇸 · Ariel B. Rock🇺🇸

   We analyze a minimal flavored gauge mediation model in which the electroweak Higgs and messenger doublets are embedded in multiplets of a discrete non-Abelian symmetry. In this scenario, the minimal Higgs-messenger sector that is consistent with the 125 GeV Higgs mass has two vectorlike pairs of messenger fields. This scenario is obtained in a specific limit of the superpotential interactions of the Higgs-messenger fields and the matter fields. Due to the structure of the messenger-matter Yukawa couplings in this limit, sizable stop mixing and flavor-diagonal soft supersymmetry breaking parameters are achieved. In most of the parameter space, the masses of the colored superpartners are at most in the 5-6 TeV range.

   hep-phPRD(2019)·6 citations
2. 02*

   Response of the QED(2) Vacuum to a Quench: Long-term Oscillations of the Electric Field and the Pair Creation Rate

   A. Otto🇩🇪 · D. Graeveling🇩🇪 · B. Kämpfer🇩🇪

   We consider -- within QED(2) -- the backreaction to the Schwinger pair creation in a time dependent, spatially homogeneous electric field. Our focus is the depletion of the external field as a quench and the subsequent long-term evolution of the resulting electric field. Our numerical solutions of the self consistent, fully backreacted dynamical equations exhibit a self-sustaining oscillation of both the electric field and the pair number depending on the coupling strength.

   hep-phPlasma Phys.Control.Fusion(2019)·10 citations
3. 03*

   Hyperfine Splitting in Muonium: Accuracy of the Theoretical Prediction

   Michael I. Eides🇺🇸

   In the last twenty years, the theory of hyperfine splitting in muonium developed without any experimental input. Finally, this situation is changing and a new experiment on measuring hyperfine splitting in muonium is now in progress at J-PARC. The goal of the MuSEUM experiment is to improve by an order of magnitude experimental accuracy of the hyperfine splitting and muon-electron mass ratio. Uncertainty of the theoretical prediction for hyperfine splitting will be crucial for comparison between the forthcoming experimental data and the theory in search of a possible new physics. In the current literature estimates of the error bars of the theoretical prediction differ roughly by a factor of two. We explain the origin of this discrepancy and obtain the theoretical prediction for the muonium hyperfine splitting $\Delta {\nu }_{HFS}^{th}(Mu)=4463302872(515)\text{mbox}Hz,\delta =1.2\times 10^{-7}$.

   hep-phhep-exphysics.atom-phPLB(2019)·33 citations
4. 04*

   The Higgs and WIMP DM Lamp Posts for New Weak Scale Physics: EFT Perspectives and the NMSSM

   Nausheen R. Shah (Wayne State U.)🇺🇸

   I will show, via effective field theory (EFT) techniques, that obtaining an observationally consistent relic density while evading stringent direct detection limits and maintaining $h_{125}$ phenomenology in an extended Higgs sector can be easily achieved. I will then map such an EFT to the low energy limit of the NMSSM with the Higgsinos integrated out. Both the singlino and the singlet-like CP-odd and even scalars in the NMSSM may play a relevant role in such a scenario, while being difficult to probe via conventional searches. The singlet sector of the general NMSSM can be mapped on to a 2HDM+S, and I will discuss prospects of probing this at the LHC using signatures such as mono-Higgs and mono-Z. This proceeding is mostly based on Refs. arXiv:1712.09873 and arXiv:1808.02667.

   hep-phhep-exNucl.Part.Phys.Proc.(2018)·1 citation
5. 05*

   Model-independent Bounds on the Standard Model Effective Theory from Flavour Physics

   Luca Silvestrini🇮🇹 · Mauro Valli🇺🇸

   Meson-antimeson mixing provides the most stringent constraints on baryon- and lepton-number conserving New Physics, probing scales higher than $10^5$ TeV. In the context of the effective theory of weak interactions, these constraints translate into severe bounds on the coefficients of $\Delta F=2$ operators. Generalizing to the effective theory invariant under the Standard Model gauge group, valid above the electroweak scale, the bounds from $\Delta F=2$ processes also affect $\Delta F=1$ and even $\Delta F=0$ operators, due to log-enhanced radiative corrections induced by Yukawa couplings. We systematically analyze the effect of the renormalization group evolution above the electroweak scale and provide for the first time the full set of constraints on all relevant dimension-six operators.

   hep-phPLB(2019)·76 citations
6. 06*

   More stringent constraints on the unitarised fermionic dark matter Higgs portal

   Shyam Balaji🇦🇺 · Archil Kobakhidze🇦🇺

   We revisit the simplest model of Higgs portal fermionic dark matter. The dark matter in this scenario is thermally produced in the early universe due to the interactions with the Higgs boson which is described by a non-renormalisable dimension-5 operator. The dark matter-Higgs scattering amplitude grows as $\propto \sqrt{s}$, signalling a breakdown of the effective description of the Higgs-dark matter interactions at large enough (compared to the mass scale $\Lambda$ of the dimention-5 operator) energies. Therefore, in order to reliably compute Higgs-dark matter scattering cross sections, we employ the K-matrix unitarisation procedure. To account for the desired dark matter abundance, the unitarised theory requires appreaciably smaller $\Lambda$ than the non-unitarised version, especially for dark matter masses around and below the Higgs resonance, $m_{\chi }\lesssim 65$ GeV, and $m_{\chi }\gtrsim$ few TeV. Consequently, we find that the pure scalar CP-conserving model is fully excluded by current direct dark matter detection experiments.

   hep-ph6 citations
7. 07*

   Galactic Center Gas Clouds and Novel Bounds on Ultra-Light Dark Photon, Vector Portal, Strongly Interacting, Composite, and Super-Heavy Dark Matter

   Amit Bhoonah🇨🇦 · Joseph Bramante🇨🇦 · Fatemeh Elahi🇮🇷 · Sarah Schon🇨🇦

   Cold gas clouds recently discovered hundreds of parsecs from the center of the Milky Way Galaxy have the potential to detect dark matter. With a detailed treatment of gas cloud microphysical interactions, we determine Galactic Center gas cloud temperatures, free electron abundances, atomic ionization fractions, heating rates, cooling rates, and find how these quantities vary with metallicity. Considering a number of different dark sector heating mechanisms, we set new bounds on ultra-light dark photon dark matter for masses $10^{-22}-10^{-10}$ eV, vector portal dark matter coupled through a sub-MeV mass boson, and up to $10^{60}$ GeV mass dark matter that interacts with baryons.

   hep-phPRD(2019)·81 citations
8. 08*

   On ${\theta }_{23}$ Octant Measurement in $3+1$ Neutrino Oscillations in T2HKK

   Naoyuki Haba🇯🇵 · Yukihiro Mimura🇯🇵 · Toshifumi Yamada🇯🇵

   It has been pointed out that the mixing of an eV-scale sterile neutrino with active flavors can lead to loss of sensitivity to the ${\theta }_{23}$ octant (sign of ${\sin }^2{\theta }_{23}-1/2$) in long baseline experiments, because the main oscillation probability $P_0=4{\sin }^2{\theta }_{23}{\sin }^2{\theta }_{13}{\sin }^2{\Delta }_{31}$ can be degenerate with the sum of the interferences with the solar oscillation amplitude and an active-sterile oscillation amplitude in both neutrino and antineutrino oscillations, depending on CP phases. In this paper, we show that the above degeneracy is resolved by measuring the same beam at different baseline lengths. We demonstrate that Tokai-to-Hyper-Kamiokande-to-Korea (T2HKK) experiment (one 187~kton fiducial volume water Cerenkov detector is placed at Kamioka, $L=295$~km, and another detector is put in Korea, $L\sim 1000$~km) exhibits a better sensitivity to the ${\theta }_{23}$ octant in those parameter regions where the experiment with two detectors at Kamioka is insensitive to it. Therefore, if a hint of sterile-active mixings is discovered in short baseline experiments, T2HKK is a better option than the plan of placing two detectors at Kamioka. We also consider an alternative case where one detector is placed at Kamioka and a different detector is at Oki Islands, $L=653$~km, and show that this configuration also leads to a better sensitivity to the ${\theta }_{23}$ octant.

   hep-phPRD(2020)·12 citations
9. 09*

   The XYZ mesons: what they aren't

   Stephen Lars Olsen🇨🇳

   I discuss the properties of some representative $XYZ$ mesons in the context of the most commonly proposed models for their underlying nature.

   hep-phhep-exEPJ Web Conf.(2019)·4 citations
10. 10*

    Cosmological constraints on light flavons

    Matti Heikinheimo🇫🇮 · Katri Huitu🇫🇮 · Venus Keus🇫🇮 · Niko Koivunen🇫🇮

    The Froggatt-Nielsen mechanism is a well-motivated framework for generating the fermion mass hierarchy. This mechanism introduces flavons, complex scalars which are singlet under the Standard Model gauge symmetry and charged under a new global family symmetry. We make use of a leptophilic flavon to produce the charged lepton Yukawa matrix. The real part of the flavon mixes with the Higgs boson and introduces lepton flavour violating interactions which are bounded by experiment. The imaginary part of the flavon, $\eta$, is a long-lived light particle, whose abundance is restricted by cosmological observations. For $m_{\eta }<2m_e$ where the decay of $\eta$ to charged leptons is kinematically forbidden, we identify allowed regions of $m_{\eta }$ with respect to the vacuum expectation value of the flavon field where all experimental and cosmological constraints are satisfied.

    hep-phJHEP(2019)·7 citations
11. 11*

    Casimir effect for nucleon parity doublets

    Tsutomu Ishikawa🇯🇵 · Katsumasa Nakayama🇯🇵 · Kei Suzuki🇯🇵

    Finite-volume effects for the nucleon chiral partners are studied within the framework of the parity-doublet model. Our model includes the vacuum energy shift for nucleons, which is the Casimir effect. We find that for the antiperiodic boundary the finite-volume effect leads to chiral symmetry restoration, and the masses of the nucleon parity doublets degenerate. For the periodic boundary, the chiral symmetry breaking is enhanced, and the masses of the nucleons also increase. We also discuss the finite-temperature effect and the dependence on the number of compactified spatial dimensions.

    hep-phhep-lathep-thnucl-thPRD(2019)·23 citations
12. 12*

    One-loop electroweak radiative corrections to polarized $e^{+}{e}^{-}\to ZH$

    S. Bondarenko🇷🇺 · Ya. Dydyshka🇷🇺 · L. Kalinovskaya🇷🇺 · L. Rumyantsev🇷🇺 · R. Sadykov🇷🇺 · V. Yermolchyk🇷🇺

    The paper describes high-precision theoretical predictions obtained for the cross sections of the process $e^{+}{e}^{-}\to ZH$ for future electron-positron colliders. The calculations performed using the SANC platform taking into account the full contribution of one-loop electroweak radiative corrections, as well as longitudinal polarization of the initial beams. Numerical results are given for the energy range $E_{cm}=250$ GeV - $1000$ GeV with various polarization degrees.

    hep-phPRD(2019)·23 citations
13. 13*

    Scalar 1-loop Feynman integrals as meromorphic functions in space-time dimension d

    Khiem Hong Phan (Univ. of Science, Vietnam National University, Ho Chi Minh City)🇻🇳 · Tord Riemann (DESY and Univ. of Silesia)🇵🇱

    The long-standing problem of representing the general massive one-loop Feynman integral as a meromorphic function of the space-time dimension $d$ has been solved for the basis of scalar one- to four-point functions with indices one. In 2003 the solution of difference equations in the space-time dimension allowed to determine the necessary classes of special functions: self-energies need ordinary logarithms and Gauss hypergeometric functions ${}_2{F}_1$, vertices need additionally Kampé de Fériet-Appell functions $F_1$, and box integrals also Lauricella-Saran functions $F_S$. In this study, alternative recursive Mellin-Barnes representations are used for the representation of $n$-point functions in terms of $(n-1)$-point functions. The approach enabled the first derivation of explicit solutions for the Feynman integrals at arbitrary kinematics. In this article, we scetch our new representations for the general massive vertex and box Feynman integrals and derive a numerical approach for the necessary Appell functions $F_1$ and Saran functions $F_S$ at arbitrary kinematical arguments.

    hep-phPLB(2019)·21 citations
14. 14*

    Gluon emission from heavy quarks in dense nuclear matter

    Le Zhang🇨🇳 · De-Fu Hou🇨🇳 · Guang-You Qin🇨🇳

    We study the medium-induced gluon emission process experienced by a hard jet parton propagating through the dense nuclear matter in the framework of deep inelastic scattering off a large nucleus. We work beyond the collinear rescattering expansion and the soft gluon emission limit, and derive a closed formula for the medium-induced single gluon emission spectrum from a heavy or light quark jet interacting with the dense nuclear medium via transverse and longitudinal scatterings. Without performing the collinear rescattering expansion, the medium-induced gluon emission spectrum is controlled by the full distribution of the differential elastic scattering rates between the propagating partons and the medium constituents. We further show that if one utilizes heavy static scattering centers for the traversed nuclear matter and takes the soft gluon emission limit, our result can reduce to the first order in opacity Djordjevic-Gyulassy-Levai-Vitev formula.

    hep-phnucl-exnucl-thPRC(2019)·18 citations
15. 15*

    Neutron lifetime and dark decay of the neutron and hydrogen

    Zurab Berezhiani🇮🇹

    The neutron, besides its $\beta$-decay $n\to pe{\bar{\nu }}_e$, might have a new decay channel $n\to n^{\prime }X$ into mirror neutron $n^{\prime }$, its nearly mass degenerate twin from parallel dark sector, and a massless boson $X$ which can be ordinary and mirror photons or some more exotic particle. Such an invisible decay could alleviate the tension between the neutron lifetimes measured in the beam and trap experiments. I discuss some phenomenological and astrophysical consequences of this scenario, which depends on the mass range of mirror neutron $n^{\prime }$. Namely, the case $m_{n^{\prime }}<m_p+m_e$ leads to a striking possibility is that the hydrogen atom ${}^1$H (protium), constituting 75 per cent of the baryon mass in the Universe, could in fact be unstable: it can decay via the electron capture into $n^{\prime }$ and ${\nu }_e$, with relatively short lifetime $\sim 10^{21}$ yr or so. If instead $m_{n^{\prime }}>m_p+m_e$, then the decay $n^{\prime }\to pe{\bar{\nu }}_e$ is allowed and $n^{\prime }$ can represent an unstable dark matter component with rather large lifetime exceeding the age of the Universe. Nevertheless, this decay would produce substantial diffuse gamma background. The dark decay explanation of the lifetime puzzle, however, has a tension with the last experimental results measuring $\beta$-asymmetry in the neutron decay.

    hep-phLHEP(2019)·52 citations
16. 16*

    Singlet-doublet fermion and triplet scalar dark matter with radiative neutrino masses

    Juri Fiaschi🇩🇪 · Michael Klasen🇩🇪 · Simon May🇩🇪

    We present a detailed study of a combined singlet-doublet fermion and triplet scalar model for dark matter. These models have only been studied separately in the past. Together, they form a simple extension of the Standard Model that can account for dark matter and explain the existence of neutrino masses, which are generated radiatively. This holds even if singlet-doublet fermions and triplet scalars never contribute simultaneously to the dark matter abundance. However, this also implies the existence of lepton flavour violating processes. In addition, this particular model allows for gauge coupling unification. The new fields are odd under a new ${\mathbb{Z}}_2$ symmetry to stabilise the dark matter candidate. We analyse the dark matter, neutrino mass and lepton flavour violation aspects both separately and in conjunction, exploring the viable parameter space of the model. This is done using a numerical random scan imposing successively the neutrino mass and mixing, relic density, Higgs mass, direct detection, collider and lepton flavour violation constraints. We find that dark matter in this model is fermionic for masses below about 1 TeV and scalar above. The narrow mass regions found previously for the two separate models are enlarged by their coupling. While coannihilations of the weak isospin partners are sizeable, this is not the case for fermions and scalars despite their often similar masses due to the relatively small coupling of the two sectors, imposed by the small neutrino masses. We observe a high degree of complementarity between direct detection and lepton flavour violation experiments, which should soon allow to fully probe the fermionic dark matter sector and at least partially the scalar dark matter sector.

    hep-phastro-ph.COJHEP(2019)·24 citations
17. 17*

    Detecting a Secondary Cosmic Neutrino Background from Majoron Decays in Neutrino Capture Experiments

    Zackaria Chacko🇺🇸 · Peizhi Du🇺🇸 · Michael Geller🇺🇸

    We consider theories in which the generation of neutrino masses is associated with the breaking of an approximate global lepton number symmetry. In such a scenario the spectrum of light states includes the Majoron, the pseudo-Nambu Goldstone boson associated with the breaking of the global symmetry. For a broad range of parameters, the Majoron decays to neutrinos at late times, after the cosmic neutrinos have decoupled from the thermal bath, resulting in a secondary contribution to the cosmic neutrino background. We determine the current bounds on this scenario, and explore the possibility of directly detecting this secondary cosmic neutrino background in experiments based on neutrino capture on nuclei. For Majoron masses in the eV range or below, the neutrino flux from these decays can be comparable to that from the primary cosmic neutrino background, making it a promising target for direct detection experiments. The neutrinos from Majoron decay are redshifted by the cosmic expansion, and exhibit a characteristic energy spectrum that depends on both the Majoron mass and its lifetime. For Majoron lifetimes of order the age of the universe or larger, there is also a monochromatic contribution to the neutrino flux from Majoron decays in the Milky Way that can be comparable to the diffuse extragalactic flux. We find that for Majoron masses in the eV range, direct detection experiments based on neutrino capture on tritium, such as PTOLEMY, will be sensitive to this scenario with 100 gram-years of data. In the event of a signal, the galactic and extragalactic components can be distinguished on the basis of their distinct energy distributions, and also by using directional information obtained by polarizing the target nuclei.

    hep-phPRD(2019)·29 citations
18. 18*

    All master integrals for three-jet production at NNLO

    D. Chicherin🇩🇪 · T. Gehrmann🇨🇭 · J. M. Henn🇩🇪 · P. Wasser🇩🇪 · Y. Zhang🇩🇪 · S. Zoia🇩🇪

    We evaluate analytically all previously unknown nonplanar master integrals for massless five-particle scattering at two loops, using the differential equations method. A canonical form of the differential equations is obtained by identifying integrals with constant leading singularities, in $D$ space-time dimensions. These integrals evaluate to $\mathbb{Q}$-linear combinations of multiple polylogarithms of uniform weight at each order in the expansion in the dimensional regularization parameter, and are in agreement with previous conjectures for nonplanar pentagon functions. Our results provide the complete set of two-loop Feynman integrals for any massless $2\to 3$ scattering process, thereby opening up a new level of precision collider phenomenology.

    hep-phhep-thPRL(2019)·150 citations
19. 19*

    Axion Misalignment Driven to the Bottom

    Raymond T. Co🇺🇸 · Eric Gonzalez🇺🇸 · Keisuke Harigaya🇺🇸

    Several theoretical motivations point to ultralight QCD axions with large decay constants $f_a\simeq \mathcal{O}(10^{16}-10^{17})$ GeV, to which experimental proposals are dedicated. This regime is known to face the problem of overproduction of axion dark matter from the misalignment mechanism unless the misalignment angle ${\theta }_{\mathrm{mis}}$ is as small as $\mathcal{O}(10^{-3}-10^{-4})$, which is generally considered a fine-tuning problem. We investigate a dynamical explanation for a small ${\theta }_{\mathrm{mis}}$. The axion mass arises from strong dynamics and may be sufficiently enhanced by early dynamics so as to overcome Hubble friction and drive the field value to the bottom of the potential long before the QCD phase transition. Together with an approximate CP symmetry in the theory, this minimum is very closely related to today's value and thus ${\theta }_{\mathrm{mis}}$ can automatically be well under unity. Owing to such efficient relaxation, the isocurvature perturbations are essentially damped. As an existence proof, using supersymmetric theories we illustrate that the Higgs coupling with the inflaton energy can successfully achieve this axion damping in a consistent inflationary cosmology.

    hep-phastro-ph.COJHEP(2019)·60 citations
20. 20*

    Super-weak force and neutrino masses

    Zoltan Trocsanyi🇭🇺

    We consider an anomaly free extension of the standard model gauge group $G_{\mathrm{SM}}$ by an abelian group to $G_{\mathrm{SM}}\otimes U(1{)}_Z$. The condition of anomaly cancellation is known to fix the $Z$-charges of the particles, but two. We fix one remaining charge by allowing for all possible Yukawa interactions of the known left handed neutrinos and new right-handed ones that obtain their masses through interaction with a new scalar field with spontaneously broken vacuum. We discuss some of the possible consequences of the model. Assuming that the new interaction is responsible for the observed differences between the standard model prediction for the anomalous magnetic moment of the muon and its measured value, we constrain the size of the new gauge coupling, the mass of the new gauge boson and the vacuum expectation value of the new scalar field.

    hep-phSymmetry(2020)·34 citations
21. 21*

    Axion Misalignment Driven to the Hilltop

    Raymond T. Co🇺🇸 · Eric Gonzalez🇺🇸 · Keisuke Harigaya🇺🇸

    The QCD axion serves as a well-motivated dark matter candidate and the misalignment mechanism is known to reproduce the observed abundance with a decay constant $f_a\simeq \mathcal{O}(10^{12})$ GeV for a misalignment angle ${\theta }_{\mathrm{mis}}\simeq \mathcal{O}(1)$. While $f_a\ll 10^{12}$ GeV is of great experimental interest, the misalignment mechanism requires the axion to be very close to the hilltop, i.e. ${\theta }_{\mathrm{mis}}\simeq \pi$. This particular choice of ${\theta }_{\mathrm{mis}}$ has been understood as fine-tuning the initial condition. We offer a dynamical explanation for ${\theta }_{\mathrm{mis}}\simeq \pi$ in a class of models. The axion dynamically relaxes to the minimum of the potential by virtue of an enhanced mass in the early universe. This minimum is subsequently converted to a hilltop because the CP phase of the theory shifts by $\pi$ when one contribution becomes subdominant to another with an opposite sign. We demonstrate explicit and viable examples in supersymmetric models where the higher dimensional Higgs coupling with the inflaton naturally achieves both criteria. Associated phenomenology includes a strikingly sharp prediction of $3\times 10^9$ GeV $\lesssim f_a\lesssim 10^{10}$ GeV and the absence of isocurvature perturbation.

    hep-phastro-ph.COJHEP(2019)·92 citations
22. 22*

    Flavor-mass majorization uncertainty relations and their links to the mixing matrix

    Alexey E. Rastegin🇷🇺 · Anzhelika M. Shemet🇷🇺

    Uncertainties in flavor and mass eigenstates of neutrinos are considered within the majorization approach. Nontrivial bounds reflect the fact that neutrinos cannot be simultaneously in flavor and mass eigenstates. As quantitative measures of uncertainties, both the Rényi and Tsallis entropies are utilized. Within the current amount of experience concerning the mixing matrix, majorization uncertainty relations need to put values of only two parameters, viz. ${\theta }_{12}$ and ${\theta }_{13}$. That is, the majorization approach is applicable within the same framework as the Maassen-Uffink relation recently utilized in this context. We also consider the case of detection inefficiencies, since it can naturally be incorporated into the entropic framework. Short comments on applications of entropic uncertainty relations with quantum memory are given.

    ↳ quant-phhep-phMod.Phys.Lett.A(2021)·2 citations
23. 23*

    QED-corrected Lellouch-Lüscher formula for $K\to \pi \pi$ decay

    Yiming Cai🇺🇸 · Zohreh Davoudi🇺🇸

    A precise SM prediction for the direct CP violation in the $K\to \pi \pi$ decay process is of great importance in confronting experiments and constraining new physics. The state-of-art lattice QCD study of this process will soon achieve a precision that QED effects can no longer be neglected. The inclusion of QED in such calculations is planned, and the formalism to relate the finite-volume matrix element obtained from these calculations to the physical amplitude is underway. Here, we report on the progress towards an extension of the Lellouch-Lüscher formalism in presence of QED, with the goal of enabling the extraction of physical amplitudes for the $K\to \pi \pi$ process with charged initial and/or final states.

    ↳ hep-lathep-phnucl-thPoS(2018)·15 citations
24. 24*

    Analytic result for a two-loop five-particle amplitude

    D. Chicherin🇩🇪 · T. Gehrmann🇨🇭 · J. M. Henn🇩🇪 · P. Wasser🇩🇪 · Y. Zhang🇩🇪 · S. Zoia🇩🇪

    We compute the symbol of the full-color two-loop five-particle amplitude in $\mathcal{N}=4$ super Yang-Mills, including all non-planar subleading-color terms. The amplitude is written in terms of permutations of Parke-Taylor tree-level amplitudes and pure functions to all orders in the dimensional regularization parameter, in agreement with previous conjectures. The answer has the correct collinear limits and infrared factorization properties, allowing us to define a finite remainder function. We study the multi-Regge limit of the non-planar terms, analyze its subleading power corrections, and present analytically the leading logarithmic terms.

    ↳ hep-thhep-phPRL(2019)·102 citations
25. 25*

    CHAMP Cosmic Rays

    David Dunsky🇺🇸 · Lawrence J. Hall🇺🇸 · Keisuke Harigaya🇺🇸

    We study interactions of cosmological relics, $X$, of mass $m$ and electric charge $qe$ in the galaxy, including thermalization with the interstellar medium, diffusion through inhomogeneous magnetic fields and Fermi acceleration by supernova shock waves. We find that for $m{}_{\sim }^{<}10^{10}q\mathrm{GeV}$, there is a large flux of accelerated $X$ in the disk today, with a momentum distribution $\propto 1/p^{2.5}$ extending to $(\beta p{)}_{max}\sim 5\times 10^{4}q\mathrm{GeV}$. Even though acceleration in supernova shocks is efficient, ejecting $X$ from the galaxy, $X$ are continually replenished by diffusion into the disk from the halo or confinement region. For $m{}_{\sim }^{>}10^{10}q\mathrm{GeV}$, $X$ cannot be accelerated above the escape velocity within the lifetime of the shock. The accelerated $X$ form a component of cosmic rays that can easily reach underground detectors, as well as deposit energies above thresholds, enhancing signals in various experiments. We find that nuclear/electron recoil experiments place very stringent bounds on $X$ at low $q$; for example, $X$ as dark matter is excluded for $q$ above $10^{-9}$ for any $m$. For larger $q$, stringent bounds on the fraction of dark matter that can be $X$ are set by Cherenkov and ionization detectors. Nevertheless, very small $q$ is highly motivated by the kinetic mixing portal, and we identify regions of $(m,q)$ that can be probed by future experiments.

    ↳ astro-ph.HEastro-ph.COhep-exhep-phJCAP(2019)·71 citations
26. 26*

    Combined Search for a Lorentz-Violating Force in Short-Range Gravity Varying as the Inverse Sixth Power of Distance

    Cheng-Gang Shao🇨🇳 · Ya-Fen Chen🇨🇳 · Yu-Jie Tan🇨🇳 · Shan-Qing Yang🇨🇳 · Jun Luo🇨🇳 · Michael Edmund Tobar🇦🇺 · J.C. Long🇺🇸 · E. Weisman🇺🇸 · Alan Kostelecky🇺🇸

    Precision measurements of the inverse-square law via experiments on short-range gravity provide sensitive tests of Lorentz symmetry. A combined analysis of data from experiments at the Huazhong University of Science and Technology and Indiana University sets simultaneous limits on all 22 coefficients for Lorentz violation correcting the Newton force law as the inverse sixth power of distance. Results are consistent with no effect at the level of $10^{-12}$ m${}^4$.

    ↳ gr-qchep-exhep-phPRL(2019)·48 citations
27. 27*

    Symmetries and Interactions from Lattice QCD

    A. Nicholson🇺🇸 · E. Berkowitz🇩🇪 · H. Monge-Camacho🇺🇸 · D. Brantley🇺🇸 · N. Garron🇬🇧 · C.C. Chang🇯🇵 · E. Rinaldi🇺🇸 · C. Monahan🇺🇸 · C. Bouchard🇬🇧 · M.A. Clark🇺🇸 · B. Joo🇺🇸 · T. Kurth🇺🇸 and 3 other authors

    Precision experimental tests of the Standard Model of particle physics (SM) are one of our best hopes for discovering what new physics lies beyond the SM (BSM). Key in the search for new physics is the connection between theory and experiment. Forging this connection for searches involving low-energy hadronic or nuclear environments requires the use of a non-perturbative theoretical tool, lattice QCD. We present two recent lattice QCD calculations by the CalLat collaboration relevant for new physics searches: the nucleon axial coupling, $g_A$, whose precise value as predicted by the SM could help point to new physics contributions to the so-called "neutron lifetime puzzle", and hadronic matrix elements of short-ranged operators relevant for neutrinoless double beta decay searches.

    ↳ hep-lathep-phnucl-th2 citations
28. 28*

    Double copy structure of CFT correlators

    Joseph A. Farrow🇬🇧 · Arthur E. Lipstein🇬🇧 · Paul McFadden🇬🇧

    We consider the momentum-space 3-point correlators of currents, stress tensors and marginal scalar operators in general odd-dimensional conformal field theories. We show that the flat space limit of these correlators is spanned by gauge and gravitational scattering amplitudes in one higher dimension which are related by a double copy. Moreover, we recast three-dimensional CFT correlators in terms of tree-level Feynman diagrams without energy conservation, suggesting double copy structure beyond the flat space limit.

    ↳ hep-thhep-phJHEP(2019)·139 citations
29. 29*

    Bound State Solution of the Klein-Fock-Gordon equation with the Hulthén plus a Ring-Shaped like potential within SUSY quantum mechanics

    A.I. Ahmadov🇦🇿 · Sh.M. Nagiyev🇦🇿 · M.V. Qocayeva🇦🇿 · K. Uzun🇹🇷 · V.A. Tarverdiyeva🇦🇿

    In this paper, the bound state solution of the modified Klein-Fock-Gordon equation is obtained for the Hulthén plus ring-shaped lake potential by using the developed scheme to overcome the centrifugal part. The energy eigenvalues and corresponding radial and azimuthal wave functions are defined for any $l\ne 0$ angular momentum case on the conditions that scalar potential is whether equal and nonequal to vector potential, the bound state solutions of the Klein-Fock-Gordon equation of the Hulthén plus ring-shaped like potential are obtained by Nikiforov-Uvarov (NU) and supersymmetric quantum mechanics (SUSYQM) methods. The equivalent expressions are obtained for the energy eigenvalues, and the expression of radial wave functions transformations to each other is revealed owing to both methods. The energy levels and the corresponding normalized eigenfunctions are represented in terms of the Jacobi polynomials for arbitrary $l$ states. A closed form of the normalization constant of the wave functions is also found. It is shown that the energy eigenvalues and eigenfunctions are sensitive to $n_r$ radial and $l$ orbital quantum numbers.

    ↳ quant-phhep-phmath-phmath.MPInt.J.Mod.Phys.A(2018)·24 citations
30. 30*

    Unification of inflation and dark matter in the Higgs-Starobinsky model

    Daris Samart (Chulalongkorn U.)🇹🇭 · Phongpichit Channuie (Walailak U.)🇹🇭

    In this work, we study unified picture of inflation and dark matter in the Higgs-Starobinsky (HS) model. As pointed out in the literature, Starobinsky $R^2$ inflation is induced by quantum correction effect from the large Higgs-curvature (graviton) coupling. We start with non-minimal coupling HS action in Jordan frame. We then transform the Jordan frame action into the Einstein one using the conformal transformation. The inflation potential is derived from the gravitational action of non-minimal-Higgs coupling and Starobinsky term in Einstein frame where the $R^2$ term is dominated in the inflationary phase of the universe. For model of inflation, we compute the inflationary parameters and confront them with Planck 2015 data. We discover that the predictions of the model are in excellent agreement with the Planck analysis. In addition, we study the Higgs field as a candidate for dark matter. The renormalization group equations (RGEs) of Higgs-Starobinsky scenario with standard model at one-loop is qualitatively analyzed. By using the solutions of parameter spaces from RGE analysis, the remnants of the quantum effect ($R^2$ term) from Higgs-graviton coupling will be implied by dark matter relic abundance.

    ↳ gr-qchep-phhep-thEPJC(2019)·16 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.