Fri·Apr 20, 2018Friday·April 20, 2018

1. 01*

   Compact model for Quarks and Leptons via flavored-Axions

   Y. H. Ahn🇰🇷

   We show how the scales responsible for Peccei-Quinn (PQ), seesaw, and Froggatt and Nielsen (FN) mechanisms can be fixed, by constructing a compact model for resolving rather recent, but fast-growing issues in astro-particle physics, including quark and leptonic mixings and CP violations, high-energy neutrinos, QCD axion, and axion cooling of stars. The model is motivated by the flavored PQ symmetry for unifying the flavor physics and string theory. The QCD axion decay constant congruent to the seesaw scale, through its connection to the astro-particle constraints of both the stellar evolution induced by the flavored-axion bremsstrahlung off electrons $e+Ze\to Ze+e+A_i$ and the rare flavor-changing decay process induced by the flavored-axion $K^{+}\to {\pi }^{+}+A_i$, is shown to be fixed at $F_A=3.56_{-0.84}^{+0.84}\times 10^{10}$ GeV (consequently, the QCD axion mass $m_a=1.54_{-0.29}^{+0.48}\times 10^{-4}$ eV, Compton wavelength of its oscillation ${\lambda }_a=8.04_{-1.90}^{+1.90}\mathrm{mm}$, and axion to neutron coupling $g_{Ann}=2.14_{-0.41}^{+0.66}\times 10^{-12}$, etc.). Subsequently, the scale associated to FN mechanism is dynamically fixed through its connection to the standard model fermion masses and mixings, $\Lambda =2.04_{-0.48}^{+0.48}\times 10^{11}\mathrm{GeV}$, and such fundamental scale might give a hint where some string moduli are stabilized in type-IIB string vacua. In the near future, the NA62 experiment expected to reach the sensitivity of $\mathrm{Br}(K^{+}\to {\pi }^{+}+A_i)<1.0\times 10^{-12}$ will probe the flavored-axions or exclude the model, if the astrophysical constraint of star cooling is really responsible for the flavored-axion.

   hep-phPRD(2018)·23 citations
2. 02*

   B-L Higgs Inflation in Supergravity With Several Consequences

   C. Pallis🇨🇾

   We consider a renormalizable extension of the minimal supersymmetric standard model endowed by an R and a gauged B - L symmetry. The model incorporates chaotic inflation driven by a quartic potential, associated with the Higgs field which leads to a spontaneous breaking of U(1)B-L, and yields possibly detectable gravitational waves. We employ semi-logarithmic Kahler potentials with an enhanced symmetry which include only quadratic terms and integer prefactor for the logarithms. An explanation of the mu term of the MSSM is also provided, consistently with the low energy phenomenology, under the condition that one related parameter in the superpotential is somewhat small. Baryogenesis occurs via non-thermal leptogenesis which is realized by the inflaton's decay to the lightest or next-to-lightest right-handed neutrinos.

   hep-phastro-ph.COhep-thPoS(2018)·5 citations
3. 03*

   $J/\psi \to \gamma {\eta }^{\prime }{\pi }^{+}{\pi }^{-}$ and the structure observed around the $\bar{p}p$ threshold

   Ling-Yun Dai🇨🇳 · Johann Haidenbauer🇩🇪 · Ulf-G. Meißner🇩🇪

   We analyze the origin of the structure observed in the reaction $J/\psi \to \gamma {\eta }^{\prime }{\pi }^{+}{\pi }^{-}$ for ${\eta }^{\prime }{\pi }^{+}{\pi }^{-}$ invariant masses close to the antiproton-proton ($\bar{p}p$) threshold, commonly associated with the $X(1835)$ resonance. Specifically, we explore the effect of a possible contribution from the two-step process $J/\psi \to \gamma \bar{N}N\to \gamma {\eta }^{\prime }{\pi }^{+}{\pi }^{-}$. The calculation is performed in distorted-wave Born approximation which allows an appropriate inclusion of the $\bar{N}N$ interaction in the transition amplitude. The $\bar{N}N$ amplitude itself is generated from a corresponding potential recently derived within chiral effective field theory. We are able to reproduce the measured spectra for the reactions $J/\psi \to \gamma \bar{p}p$ and $J/\psi \to \gamma {\eta }^{\prime }{\pi }^{+}{\pi }^{-}$ for invariant masses around the $\bar{p}p$ threshold. The structure seen in the ${\eta }^{\prime }{\pi }^{+}{\pi }^{-}$ spectrum emerges as a threshold effect due to the opening of the $\bar{p}p$ channel.

   hep-phnucl-thPRD(2018)·20 citations
4. 04*

   Higgs-boson-pair production $H(\to b\overline{b})H(\to \gamma \gamma )$ from gluon fusion at the HL-LHC and HL-100 TeV hadron collider

   Jung Chang🇰🇷 · Kingman Cheung🇹🇼 · Jae Sik Lee🇰🇷 · Chih-Ting Lu🇹🇼 · Jubin Park🇰🇷

   We perform the most up-to-date comprehensive signal-background analysis for Higgs-pair production in $HH\to b\bar{b}\gamma \gamma$ channel at the HL-LHC and HL-100 TeV hadron collider, with the goal of probing the self-coupling ${\lambda }_{3H}$ of the Higgs boson. We simulate all the standard-model signal and background processes with the simulation tools almost as sophisticated as what experimentalists are using. We find that even for the most promising channel $HH\to b\bar{b}\gamma \gamma$ at the HL-LHC with a luminosity of 3000 fb${}^{-1}$, the significance is still not high enough to establish the Higgs self-coupling at the standard model (SM) value. Instead, we can only constrain the self-coupling to $-1.0<{\lambda }_{3H}<7.6$ at $95\%$ confidence level after considering the uncertainties associated with the top-Yukawa coupling and the estimation of backgrounds. Here we also extend the study to the HL-100 TeV hadron collider. With a luminosity of 3 ab${}^{-1}$, we find there exists a bulk region of $2.6\text{lsim}{\lambda }_{3H}\text{lsim}4.8$ in which one cannot pin down the trilinear coupling. Otherwise one can measure the coupling with a high precision. At the SM value, for example, we show that the coupling can be measured with about 20 \% accuracy. While assuming 30 ab${}^{-1}$, the bulk region reduces to $3.1\text{lsim}{\lambda }_{3H}\text{lsim}4.3$ and the trilinear coupling can be measured with about 7 \% accuracy at the SM value. With all the simulated background events and results, our study can be useful to probe the Higgs potential of various models with extended Higgs sector, such as two-Higgs-doublet model, MSSM, etc.

   hep-phPRD(2019)·53 citations
5. 05*

   Baryon parity doublets and chiralspin symmetry

   M. Catillo🇦🇹 · L. Ya. Glozman🇦🇹

   The chirally symmetric baryon parity-doublet model can be used as an effective description of the baryon-like objects in the chirally symmetric phase of QCD. Recently it has been found that above the critical temperature higher chiralspin symmetries emerge in QCD. It is demonstrated here that the baryon parity-doublet Lagrangian is manifestly chiralspin-invariant. We construct nucleon interpolators with fixed chiralspin transformation properties that can be used in lattice studies at high T.

   hep-phhep-lathep-thPRD(2018)·12 citations
6. 06*

   Constraints on axion-like particle properties with very high energy gamma-ray observations of Galactic sources

   Yun-Feng Liang🇨🇳 · Cun Zhang🇨🇳 · Zi-Qing Xia🇨🇳 · Lei Feng🇨🇳 · Qiang Yuan🇨🇳 · Yi-Zhong Fan🇨🇳

   Axion-like particles (ALPs) can oscillate to photons and vice versa in electromagnetic fields. The photon-ALP oscillation provides an attractive solution to the apparent transparency of the Universe to TeV photons. The allowed parameter regions for the ALP mass $m_{\mathrm{a}}\le 10^{-7}$ eV have been tightly constrained by the Fermi-LAT and H.E.S.S observations of some extragalactic sources. In this work we show for the first time that the H.E.S.S observations of some TeV sources in the Galactic plane exclude the highest ALP mass region (i.e., $m_{\mathrm{a}}\sim \mathrm{a}\mathrm{few}\times 10^{-7}$ eV) that accounts for the TeV transparency of the Universe. The upcoming CTA observations of the Galactic TeV sources are shown to be able to improve the constraints significantly.

   hep-phastro-ph.HEJCAP(2019)·50 citations
7. 07*

   Nucleon Mass Sum Rule Violation in QCD and Confinement

   Gouranga C Nayak🇺🇸

   In this paper we show that for a nucleon at rest if the quarks and/or antiquarks are in motion inside the nucleon producing chromo-magnetic field then the mass sum rule in QCD is violated when the confinement potential energy at large distance $r$ rises linearly with $r$ (or faster). Hence we find that the mass of the nucleon at rest is not equal to the mass-energy of all the quarks plus antiquarks plus gluons inside the nucleon if there exists chromo-magnetic field inside the nucleon and the confinement potential energy at large distance $r$ rises linearly with $r$ (or faster).

   hep-phhep-latnucl-th3 citations
8. 08*

   Unparticle Decay of Neutrinos and its Possible Signatures at a ${\mathrm{Km}}^2$ Detector for (3+1) Flavour Framework

   Madhurima Pandey🇮🇳

   We consider a scenario where ultra high energy neutrinos undergo unparticle decay during its passage from its cosmological source to Earth. The idea of unparticle had been first proposed by Georgi by considering the possible existence of an unknown scale invariant sector at high energies and the unparticles in this sector manifest itself below a dimensional transmutation scale ${\Lambda }_{\mathcal{U}}$. We then explore the possible signature of such decaying neutrinos to unparticles at a square kilometer detector such as IceCube.

   hep-phJHEP(2019)·4 citations
9. 09*

   Dynamical gluon mass at non-zero temperature in instanton vacuum model

   M. Musakhanov🇺🇿 · Sh. Baratov🇺🇿 · N. Rakhimov🇺🇿

   In the framework of the instanton liquid model (ILM), we consider thermal modifications of the gluon properties in different scenarios of temperature $T$ dependence of the average instanton size $\bar{\rho }(T)$ and the instanton density $n(T)$ known from the literature. Due to interactions with instantons, the gluons acquire the dynamical temperature dependent "electric" gluon mass $M_{el}(q,T).$ We found that at small momenta and zero temperature $M_{el}(0,0)\approx 362\mathrm{MeV}$ at the phenomenological values of $\bar{\rho }(0)=1/3\mathrm{fm}$ and $n(0)=1{\mathrm{fm}}^{-4}$, however the $T$-dependence of the mass is very sensitive to the temperature dependence of the instanton vacuum parameters $\bar{\rho }(T),n(T)$: it is very mild in case of the lattice-motivated dependence and decreases steeply in the whole range with theoretical parametrization. We see that in region $0<T<T_c$ ILM is able to reproduce lattice results for the dynamical "electric" gluon mass.

   hep-phPRD(2019)·3 citations
10. 10*

    Scalar Dark Matter Clumps with Angular Momentum

    Mark P. Hertzberg🇺🇸 · Enrico D. Schiappacasse🇺🇸

    The behavior of light scalar dark matter has been a subject of much interest recently as it can lead to interesting small scale behavior. In particular, this can lead to the formation of gravitationally bound clumps for these light scalars, including axions. In Ref. [1] we analyzed the behavior of these clumps, assuming spherical symmetry, allowing for both attractive and repulsive self-interactions. There is a maximum allowed mass for the clumps in the case of attractive interactions, and a minimum radius for the clumps in the case of repulsive interactions, which is saturated at large mass. Here we extend this work to include non-spherically symmetric clumps. Since the system tries to re-organize into a BEC ground state, we consider configurations with a conserved non-zero angular momentum, and construct minimum energy configurations at fixed particle number and fixed angular momentum. We find generalizations of the previous spherically symmetric results. In particular, while there is still a maximum mass for the attractive case, its value increases with angular momentum. Also, the minimum radius in the repulsive case is raised to higher radii. We clarify how a recent claim in the literature of an upper bound on angular momentum is due to inaccurate numerics. In a forthcoming paper we shall investigate the possibility of resonance of axion clumps into both visible and hidden sector photons, and analyze how the altered mass and radius from non-zero angular momentum affects the resonance.

    hep-phastro-ph.COastro-ph.GAgr-qc+1JCAP(2018)·45 citations
11. 11*

    Relic Density of Asymmetric Dark Matter in Modified Cosmological Scenarios

    Hoernisa Iminniyaz🇨🇳 · Burhan Salai🇨🇳 · Guoliang Lv🇨🇳

    We discuss the relic abundance of asymmetric Dark Matter particles in modified cosmological scenarios where the Hubble rate is changed with respect to the standard cosmological scenario. The modified Hubble rate leaves its imprint on the relic abundance of asymmetric Dark Matter particles if the asymmetric Dark Matter particles freeze--out in this era. For generality we parameterize the modification of the Hubble rate and then calculate the relic abundance of asymmetric Dark Matter particles and anti--particles. We found the abundances for the Dark Matter particles and anti--particles are enhanced in the modified cosmological models. The indirect detection signal is possible for the asymmetric Dark Matter particles due to the increased annihilation rate in the modified cosmological models. Applying Planck data, we find the constraints on the parameters of the modified cosmological models.

    hep-phCommun.Theor.Phys.(2018)·11 citations
12. 12*

    Boosted Dark Matter Quarrying at Surface Neutrino Detectors

    Doojin Kim🇨🇭 · Kyoungchul Kong🇺🇸 · Jong-Chul Park🇰🇷 · Seodong Shin🇺🇸

    We propose the idea of "Earth Shielding" to reject cosmic-ray backgrounds, in the search for boosted dark matter at surface neutrino detectors, resulting in the enhancement of the signal-to-background ratio. The identification of cosmic-originating rare signals, especially lacking features, at surface detectors is often considered hopeless due to a vast amount of cosmic-ray-induced background, hence underground experiments are better motivated to avoid such a challenge. We claim that surface detectors can attain remarkable sensitivities to even featureless signals, once restricting to events coming through the Earth from the opposite side of the detector location for the signals leaving appreciable tracks from which the source direction is inferred. By doing so, potential backgrounds in the signal region of interest can be substantially suppressed. To validate our claim, we study experimental reaches at several surface experiments such as SBN Program (MicroBooNE, ICARUS, and SBND) and ProtoDUNE for elastic boosted dark matter signatures stemming from the Galactic Center. We provide a systematic discussion on maximizing associated signal sensitivities.

    hep-phJHEP(2018)·40 citations
13. 13*

    Three-loop massive form factors: complete light-fermion and large-$N_c$ corrections for vector, axial-vector, scalar and pseudo-scalar currents

    Roman N. Lee🇷🇺 · Alexander V. Smirnov🇷🇺 · Vladimir A. Smirnov🇷🇺 · Matthias Steinhauser🇩🇪

    We compute the three-loop QCD corrections to the massive quark form factors with external vector, axial-vector, scalar and pseudo-scalar currents. All corrections with closed loops of massless fermions are included. The non-fermionic part is computed in the large-$N_c$ limit, where only planar Feynman diagrams contribute.

    hep-phJHEP(2018)·42 citations
14. 14*

    Heavy Quark Form Factors at Three Loops in the Planar Limit

    J. Ablinger🇦🇹 · J. Blümlein🇩🇪 · P. Marquard🇩🇪 · N. Rana🇩🇪 · C. Schneider🇦🇹

    We compute the color-planar and complete light quark non-singlet contributions to the heavy quark form factors in the case of the axialvector, scalar and pseudoscalar currents at three loops in perturbative QCD. We evaluate the master integrals applying a new method based on differential equations for general bases, which is applicable for all first order factorizing systems. The analytic results are expressed in terms of harmonic polylogarithms and real-valued cyclotomic harmonic polylogarithms.

    hep-phPLB(2018)·49 citations
15. 15*

    Primordial Black Holes from Inflation and Quantum Diffusion

    Matteo Biagetti🇳🇱 · Gabriele Franciolini🇨🇭 · Alex Kehagias🇬🇷 · Antonio Riotto🇨🇭

    Primordial black holes as dark matter may be generated in single-field models of inflation thanks to the enhancement at small scales of the comoving curvature perturbation. This mechanism requires leaving the slow-roll phase to enter a non-attractor phase during which the inflaton travels across a plateau and its velocity drops down exponentially. We argue that quantum diffusion has a significant impact on the primordial black hole mass fraction making the classical standard prediction not trustable.

    ↳ astro-ph.COgr-qchep-phJCAP(2018)·210 citations
16. 16*

    Fifth forces, Higgs portals and broken scale invariance

    Clare Burrage🇬🇧 · Edmund J. Copeland🇬🇧 · Peter Millington🇬🇧 · Michael Spannowsky🇬🇧

    We study the relationship between the strength of fifth forces and the origin of scale breaking in the Standard Model (SM) of particle physics. We start with a light scalar field that is conformally coupled to a toy SM matter sector through a Weyl rescaling of the metric. After appropriately normalizing the fields, the conformally coupled scalar only interacts directly with the would-be Higgs field through kinetic-mixing and Higgs-portal terms. Thus, for the first time, we describe the equivalence of conformally coupled scalar-tensor modifications of gravity and Higgs-portal theories, and we find that the usual tree-level fifth forces only emerge if there is mass mixing between the conformally coupled scalar and the Higgs field. The strength of the fifth force, mediated by the light scalar, then depends on whether the mass of the Higgs arises from an explicit symmetry-breaking term or a spontaneous mechanism of scale breaking. Solar System tests of gravity and the non-observation of fifth forces therefore have the potential to provide information about the structure of the Higgs sector and the origin of its symmetry breaking, setting an upper bound on the magnitude of any explicit scale-breaking terms. These results demonstrate the phenomenological importance (both for cosmology and high-energy physics) of considering how scalar-tensor modifications of gravity are embedded within extensions of the SM.

    ↳ hep-thastro-ph.COgr-qchep-phJCAP(2018)·61 citations
17. 17*

    Can Cosmology Provide a Test of Quantum Mechanics?

    Julian Georg🇺🇸 · Carl Rosenzweig🇺🇸

    Inflation predicts that quantum fluctuations determine the large scale structure of the Universe. This raises the striking possibility that quantum mechanics, developed to describe nature at short distances, can be tested by studying nature at its most immense -- cosmology. We illustrate the potential of such a test by adapting the simplest form of the inflationary paradigm. A nonlinear generalization of quantum mechanics modifies predictions for the cosmological power spectrum. If we assume that the nonlinear parameter $b$ is a comoving quantity observational cosmology, within the context of single field inflation, is sufficiently precise to place a stringent limit, $b\le 3\times 10^{-37}$ eV, on the current, physical size of the nonlinear term.

    ↳ gr-qcastro-ph.COhep-phhep-thJCAP(2020)·2 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.