Fri·Oct 13, 2017Friday·October 13, 2017

1. 01*

   Molecular ${\Omega }_c$ states generated from coupled meson-baryon channels

   V. R. Debastiani🇪🇸 · J. M. Dias🇪🇸 · W. H. Liang🇨🇳 · E. Oset🇪🇸

   We have investigated ${\Omega }_c$ states that are dynamically generated from the meson-baryon interaction. We use an extension of the local hidden gauge to obtain the interaction from the exchange of vector mesons. We show that the dominant terms come from the exchange of light vectors, where the heavy quarks are spectators. This has as a consequence that heavy quark symmetry is preserved for the dominant terms in the $(1/m_Q)$ counting, and also that the interaction in this case can be obtained from the $\text{SU(3)}$ chiral Lagrangians. We show that for a standard value for the cutoff regulating the loop, we obtain two states with $J^P={1/2}^{-}$ and two more with $J^P={3/2}^{-}$, three of them in remarkable agreement with three experimental states in mass and width. We also make predictions at higher energies for states of vector-baryon nature.

   hep-phPRD(2018)·99 citations
2. 02*

   Addendum to arXiv:0907.2110: "Charm and Bottom Quark Masses: An Update"

   Konstantin G. Chetyrkin🇩🇪 · Johann H. Kuhn🇩🇪 · Andreas Maier🇬🇧 · Philipp Maierhofer🇩🇪 · Peter Marquard🇩🇪 · Matthias Steinhauser🇩🇪 · Christian Sturm🇩🇪

   We update the experimental moments for the charm quark as computed in arXiv:hep-ph/0702103. and used in arXiv:0907.2110 and arXiv:1010.6157 for the determination of the charm-quark mass. The new value for the MSbar charm-quark mass reads mc(3GeV)=0.993+/-0.008 GeV.

   hep-phPRD(2017)·46 citations
3. 03*

   Massive charged-current coefficient functions in deep-inelastic scattering at NNLO and impact on strange-quark distributions

   Jun Gao🇨🇳

   We present details on calculation of next-to-next-to-leading order QCD corrections to massive charged-current coefficient functions in deep-inelastic scattering. Especially we focus on the application to charm-quark production in neutrino scattering on fixed target that can be measured via the dimuon final state. We construct a fast interface to the calculation so for any parton distributions the cross sections can be evaluated within milliseconds by using the pre-generated interpolation grids. We discuss agreements of various theoretical predicitons with the NuTeV and CCFR dimuon data and the impact of the results on determination of the strange-quark distributions.

   hep-phJHEP(2018)·42 citations
4. 04*

   SM Higgs boson and $t\to cZ$ decays in the 2HDM type III with CP violation

   Ricardo Gaitán🇲🇽 · Roberto Martinez🇨🇴 · Jose Halim Montes de Oca🇲🇽 · Estela A. Garcés🇲🇽

   We compute the contributions to rare top decays $t\to cZ$ and $t\to c{h}_1$ from the scalar sector in the 2HDM type III with CP violation, where $h_1$ is the Standard Model Higgs boson. The branching ratio for $BR(t\to cZ)$ and $BR(t\to c{h}_1)$ are obtained as a function of the model parameters. In particular, the $BR(t\to cZ)$ can increase its value up to $10^{-3}$ for $\tan \beta =1$ and masses for the additional Higgs bosons of $m_{h_2,h_3,H^{\pm }}\sim 0.5$ TeV. Meanwhile $BR(t\to c{h}_1)$ can reach values of the order of $\sim 10^{-2}$. We constrain the model parameters (mixing angles of the neutral scalar fields in the CP violation context and $\tan \beta$) using the reported values of the signal strengths $R_{XX}$ and $b\to s\gamma$ process.

   hep-phPRD(2018)·16 citations
5. 05*

   Possible resonance effect of dark matter axions in SNS Josephson junctions

   Christian Beck🇬🇧

   Dark matter axions can generate peculiar effects in special types of Josephson junctions, so-called SNS junctions. One can show that the axion field equations in a Josephson environment allow for very small oscillating supercurrents, which manifest themselves as a tiny wiggle in the I-V curve, a so-called Shapiro step, which occurs at a frequency given by the axion mass. The effect is very small but perfectly measurable in modern nanotechnological devices. In this paper I will summarize the theory and then present evidence that candidate Shapiro steps of this type have indeed been seen in several independent condensed matter experiments. Assuming the observed tiny Shapiro steps are due to axion flow then these data point to an axion mass of $(106\pm 6)\mu$eV, consistent with what is expected for the QCD axion. In addition to the above small Shapiro resonance effects at frequencies in the GHz region one also expects to see broad-band noise effects at much lower frequencies. Overall this approach provides a novel pathway for the future design of new types of axionic dark matter detectors. The resonant Josephson data summarized in this paper are consistent with a 'vanilla' axion with a coupling constant $f_a=\sqrt{v_{EW}{m}_{Pl}}=5.48\cdot 10^{10}$GeV given by the geometric average of the electroweak symmetry breaking scale $v_{EW}$ and the Planck mass $m_{Pl}$.

   hep-phastro-ph.IMPoS(2017)·6 citations
6. 06*

   Chiral Perturbation Theory for Neutron-antineutron Oscillations

   Johan Bijnens🇸🇪 · Erik Kofoed (Lund)🇸🇪

   We construct the Chiral Perturbation Theory operators for neutron-antineutron oscillations and use these to estimate chiral and finite volume corrections at one-loop order.

   hep-phhep-latEPJC(2017)·16 citations
7. 07*

   The contribution of pseudoscalar and axial-vector mesons to hyperfine structure of muonic hydrogen

   A.E. Dorokhov🇷🇺 · N.I. Kochelev🇨🇳 · A.P. Martynenko🇷🇺 · F.A. Martynenko🇷🇺 · A.E. Radzhabov🇨🇳 · R.N. Faustov🇷🇺

   In the framework of the quasipotential method in quantum electrodynamics we calculate the contribution of light pseudoscalar (PS) and axial-vector (AV) mesons to the interaction operator of a muon and a proton in muonic hydrogen atom. The coupling of mesons with the muon is via two-photon intermediate state. The parametrization of the transition form factor of two photons into PS and AV mesons, based on the experimental data on the transition form factors and QCD asymptotics, is used. Numerical estimates of the contributions to the hyperfine structure of the spectrum of the S and P levels are presented. It is shown that such contribution to the hyperfine splitting in muonic hydrogen is rather important for a comparison with precise experimental data.

   hep-phJ.Phys.Conf.Ser.(2017)·4 citations
8. 08*

   Lorentz violation parameters and noncommutative scale

   S. Aghababaei🇮🇷 · M. Haghighat🇮🇷

   We consider the noncommutative Standard Model that contains Lorentz symmetry violation as a subset of the Standard Model extension. We introduce a constant electromagnetic field as a background to derive mutual relations between the free parameters of both theories. As the Lorentz violation parameters of the Standard Model extension are extensively explored in different experiments and many stringent bounds on these parameters are available, we can find new bounds on the scale of noncommutativity of the order of a few to tens of teraelectron volts.

   hep-phhep-thPRD(2017)·8 citations
9. 09*

   Double parton scattering theory overview

   Markus Diehl🇩🇪 · Jonathan R. Gaunt🇨🇭

   The dynamics of double hard scattering in proton-proton collisions is quite involved compared with the familiar case of single hard scattering. In this contribution, we review our theoretical understanding of double hard scattering and of its interplay with other reaction mechanisms.

   hep-phAdv.Ser.Direct.High Energy Phys.(2018)·70 citations
10. 10*

    Three-Higgs-doublet model under A4 symmetry implies alignment

    Soumita Pramanick (HRI, Allahabad and Univ. of Calcutta)🇮🇳 · Amitava Raychaudhuri (Univ. of Calcutta)🇮🇳

    A model with three scalar doublets can be conveniently accommodated within an A4 symmetric framework. The A4 symmetry permits only a restricted form for the scalar potential. We show that for the global minima of this potential alignment follows as a natural consequence. We also verify that in every case positivity and unitarity constraints are satisfactorily met.

    hep-phhep-exJHEP(2018)·28 citations
11. 11*

    The Three Loop Two-Mass Contribution to the Gluon Vacuum Polarization

    J. Blümlein🇩🇪 · A. De Freitas🇩🇪 · C. Schneider🇦🇹 · K. Schönwald🇩🇪

    We calculate the two-mass contribution to the 3-loop vacuum polarization of the gluon in Quantum Chromodynamics at virtuality $p^2=0$ for general masses and also present the analogous result for the photon in Quantum Electrodynamics.

    hep-phhep-th4 citations
12. 12*

    Features of $\omega$ photoproduction off nucleon target at forward angles : Dominance of $\pi$ exchange with Regge cuts and scaling of differential cross sections

    Byung-Geel Yu🇰🇷 · Tae Keun Choi🇰🇷 · Kook-Jin Kong🇰🇷

    We investigate photoproduction of $\omega$ off a nucleon target $\gamma N\to \omega N$ by using a Reggeized model where $\pi (135)+\sigma (500)+f_1(1285)+f_2(1270)$+Pomeron exchanges are included in the $t$-channel for the reaction at forward angles. The reaction mechanism at low energy is featured by the dominance of the $\pi$ exchange with the absorptive cuts introduced to modulate the pion contribution to both $\gamma p\to \omega p$ and $\gamma n\to \omega n$ reactions. Necessity of $\sigma$ exchange is illustrated in the analysis of the cross section from natural parity exchanges. Cross sections for differential, total, and spin density matrix with beam polarization are reproduced and compared with existing data on $\gamma p\to \omega p$. Scaled differential cross sections of Jefferson Lab data on $\gamma p\to \omega p$ are investigated at the production angle $\theta =90^{\circ }$ with the nonlinear trajectories for a saturation. Differential and total cross sections for the $\gamma n\to \omega n$ reaction are analyzed to compare with recent experimental data at the CBELSA/TAPS Collaboration. An application to the $\gamma p\to \omega {\Delta }^{+}$ reaction is presented to demonstrate the significance of the $\pi$ exchange in the total and differential cross sections.

    hep-phnucl-thJ.Phys.G(2019)·11 citations
13. 13*

    Four-dimensional regularization of higher-order computations: FDU approach

    German F. R. Sborlini🇮🇹 · Felix Driencourt-Mangin🇪🇸 · Roger Hernandez-Pinto🇲🇽 · German Rodrigo🇪🇸

    We have recently proposed a new regularization framework based on the loop-tree duality theorem. This theorem allows to rewrite loop level amplitudes in terms of tree-level structures and phase-space integrations. In consequence, it is possible to combine naturally real and virtual contributions at integrand level. Moreover, through the introduction of a proper momentum-mapping, a complete local cancellation of infrared singularities is achieved, by-passing the necessity of counter-terms. In this article, we briefly explain the implementation of this novel approach to compute some physical processes, and we show how to deal with both infrared and ultraviolet divergences without using DREG.

    hep-phhep-thPoS(2017)·4 citations
14. 14*

    Dissecting the hadronic contributions to $(g-2{)}_{\mu }$ by Schwinger's sum rule

    Franziska Hagelstein (JGU Mainz and AEC Bern)🇨🇭 · Vladimir Pascalutsa (JGU Mainz)🇩🇪

    The theoretical uncertainty of $(g-2{)}_{\mu }$ is currently dominated by hadronic contributions. In order to express those in terms of directly measurable quantities, we consider a sum rule relating $g-2$ to an integral of a photo-absorption cross section. The sum rule, attributed to Schwinger, can be viewed as a combination of two older sum rules: Gerasimov-Drell-Hearn and Burkhardt-Cottingham. The Schwinger sum rule has an important feature, distinguishing it from the other two: the relation between the anomalous magnetic moment and the integral of a photo-absorption cross section is linear, rather than quadratic. The linear property makes it suitable for a straightforward assessment of the hadronic contributions to $(g-2{)}_{\mu }$. From the sum rule we rederive the Schwinger $\alpha /2\pi$ correction, as well as the formula for the hadronic vacuum-polarization contribution. As an example of the light-by-light contribution we consider the single-meson exchange.

    hep-phnucl-thPRL(2018)·30 citations
15. 15*

    H-COUP: a program for one-loop corrected Higgs boson couplings in non-minimal Higgs sectors

    Shinya Kanemura🇯🇵 · Mariko Kikuchi🇹🇼 · Kodai Sakurai🇯🇵 · Kei Yagyu🇮🇹

    We describe a numerical calculation tool H-COUP written in Fortran, which provides one-loop electroweak corrected vertices for the discovered Higgs boson $h(125)$ in various Higgs sectors. The renormalization is based on the improved on-shell scheme without gauge dependence. In the first version H-COUP_1.0, the following models are included, namely, the Higgs singlet model, four types (Type-I, Type-II, Type-X, Type-Y) of two Higgs doublet models with a softly-broken $Z_2$ symmetry and the inert doublet model. We first briefly introduce these models and then explain how to install and run this tool in an individual machine. A sample of numerical outputs is provided for user information.

    hep-phComput.Phys.Commun.(2018)·71 citations
16. 16*

    Observable Gravitational Waves From Higgs Inflation in SUGRA

    C. Pallis🇨🇾

    We consider models of chaotic inflation driven by the real parts of a conjugate pair of Higgs superfields involved in the spontaneous breaking of a grand unification symmetry at a scale assuming its supersymmetric value. Employing quadratic Kaehler potentials with a prominent shift-symmetric part proportional to c- and a tiny violation, proportional to c+, included in a logarithm we show that the inflationary observables provide an excellent match to the recent Planck and Bicep2/Keck Array results setting, e.g., 0.012<=c+/c-<1/N where -N<0 is the prefactor of the logarithm. Moreover, we analyze several possible stabilization mechanisms for the non-inflaton accompanying superfield using just quadratic terms. In all cases, inflation can be attained for subplanckian inflaton values with the corresponding effective theories retaining the perturbative unitarity up to the Planck scale.

    hep-phastro-ph.COhep-thPoS(2017)·5 citations
17. 17*

    Characterizing Boosted Dijet Resonances with Jet Energy Correlators

    R. Sekhar Chivukula🇺🇸 · Kirtimaan A. Mohan🇺🇸 · Dipan Sengupta🇺🇸 · Elizabeth H. Simmons🇺🇸

    We show that Jet Energy Correlation variables can be used effectively to discover and distinguish a wide variety of boosted light dijet resonances at the LHC through sensitivity to their transverse momentum and color structures.

    hep-phJHEP(2018)·6 citations
18. 18*

    Large $h\to bs$ in generic two-Higgs-doublet models

    Andreas Crivellin🇨🇭 · Julian Heeck🇧🇪 · Dario Mueller🇨🇭

    We investigate the possible size of $h\to bs$ in two-Higgs-doublet models with generic Yukawa couplings. Even though the corresponding rates are in general expected to be small due to the indirect constraints from $B_s\to {\mu }^{+}{\mu }^{-}$ and $B_s$--${\overline{B}}_s$ mixing, we find regions in parameter space where $h\to bs$ can have a sizable branching ratio well above 10\%. This requires a tuning of the neutral scalar masses and their couplings to muons, but then all additional constraints such as $B\to X_s\gamma$, $(g-2{)}_{\mu }$, and $h\to {\mu }^{+}{\mu }^{-}$ are satisfied. In this case, $h\to bs$ can be a relevant background in $h\to b\bar{b}$ searches and vice versa due to the imperfect $b$-tagging purity. Furthermore, if $h\to bs$ is sizeable, one expects two more scalar resonances in the proximity of $m_h$. We briefly comment on other flavour violating Higgs decays and on the 95 GeV $\gamma \gamma$ resonance within generic two-Higgs-doublet models.

    hep-phhep-exPRD(2018)·54 citations
19. 19*

    Froissart Bound and Transverse Momentum Dependent Parton Distribution Functions (TMDPDF) with self-similarity

    Baishali Saikia🇮🇳 · D K Choudhury🇮🇳

    Froissart Bound implies that the total proton-proton cross-section (or equivalently structure function) cannot rise faster than the logarithmic growth ${\log }^{2}s\sim {\log }^2(1/x)$, where \textit{s} is the square of the center of mass energy and \textit{x} is the Bjorken variable. In the present report, compatibility of such behavior will be shown in case of Transverse Momentum Dependent Parton Distributions Functions (TMDPDF) or TMDs for the model of proton based on self-similarity.

    hep-ph0 citations
20. 20*

    On the problem of initial conditions for inflation

    Andrei Linde🇺🇸

    I review the present status of the problem of initial conditions for inflation and describe several ways to solve this problem for many popular inflationary models, including the recent generation of the models with plateau potentials favored by cosmological observations.

    ↳ hep-thastro-ph.COgr-qchep-phFound.Phys.(2018)·85 citations
21. 21*

    Searching for axion stars and Q-balls with a terrestrial magnetometer network

    D. F. Jackson Kimball🇺🇸 · D. Budker🇩🇪 · J. Eby🇺🇸 · M. Pospelov🇨🇦 · S. Pustelny🇵🇱 · T. Scholtes🇨🇭 · Y. V. Stadnik🇩🇪 · A. Weis🇨🇭 · A. Wickenbrock🇩🇪

    Light (pseudo-)scalar fields are promising candidates to be the dark matter in the Universe. Under certain initial conditions in the early Universe and/or with certain types of self-interactions, they can form compact dark-matter objects such as axion stars or Q-balls. Direct encounters with such objects can be searched for by using a global network of atomic magnetometers. It is shown that for a range of masses and radii not ruled out by existing observations, the terrestrial encounter rate with axion stars or Q-balls can be sufficiently high (at least once per year) for a detection. Furthermore, it is shown that a global network of atomic magnetometers is sufficiently sensitive to pseudoscalar couplings to atomic spins so that a transit through an axion star or Q-ball could be detected over a broad range of unexplored parameter space.

    ↳ physics.atom-phastro-ph.IMhep-phquant-phPRD(2018)·64 citations
22. 22*

    Status of Sterile Neutrino fits with Global Data

    Alejandro Diaz🇺🇸

    A number of short baseline neutrino oscillation experiments have observed an anomalous excess of neutrinos in the low energy range. This may hint towards the existence of additional neutrino mass splittings. If true, additional sterile (non-interacting) neutrino states above the current 3 neutrino model would be required. On the other hand, many parameters of the allowed space are limited by experiments that have seen no anomaly. We will introduce models which accommodate these additional neutrinos, and then discuss our work towards fitting these models to the available global high $\Delta m^2$ oscillation data. We will then present the latest results of these fits.

    ↳ hep-exhep-ph1 citation
23. 23*

    Color-suppression of non-planar diagrams in bosonic bound states

    J. H. Alvarenga Nogueira🇧🇷 · Chueng-Ryong Ji🇺🇸 · E. Ydrefors🇧🇷 · T. Frederico🇧🇷

    We study the suppression of non-planar diagrams in a scalar QCD model of a meson system in $3+1$ space-time dimensions due to the inclusion of the color degrees of freedom. As a prototype of the color-singlet meson, we consider a flavor-nonsinglet system consisting of a scalar-quark and a scalar-antiquark with equal masses exchanging a scalar-gluon of a different mass, which is investigated within the framework of the homogeneous Bethe-Salpeter equation. The equation is solved by using the Nakanishi representation for the manifestly covariant bound-state amplitude and its light-front projection. The resulting non-singular integral equation is solved numerically. The damping of the impact of the cross-ladder kernel on the binding energies are studied in detail. The color-suppression of the cross-ladder effects on the light-front wave function and the elastic electromagnetic form factor are also discussed. As our results show, the suppression appears significantly large for $N_c=3$, which supports the use of rainbow-ladder truncations in practical nonperturbative calculations within QCD.

    ↳ hep-thhep-phPLB(2018)·7 citations
24. 24*

    Rope Hadronization and Strange Particle Production

    Christian Bierlich🇸🇪

    Rope Hadronization is a model extending the Lund string hadronization model to describe environments with many overlapping strings, such as high multiplicity pp collisions or $AA$ collisions. Including effects of Rope Hadronization drastically improves description of strange/non-strange hadron ratios as function of event multiplicity in all systems from $e^{+}{e}^{-}$ to $AA$. Implementation of Rope Hadronization in the MC event generators DIPSY and Pythia8 is discussed, as well as future prospects for jet studies and studies of small systems.

    ↳ nucl-thhep-phEPJ Web Conf.(2018)·36 citations
25. 25*

    Vector two-point functions in finite volume using partially quenched chiral perturbation theory

    Johan Bijnens🇸🇪 · Johan Relefors (Lund)🇸🇪

    We calculate vector-vector correlation functions at two loops using partially quenched chiral perturbation theory including finite volume effects and twisted boundary conditions. We present expressions for the flavor neutral cases and the flavor charged case with equal masses. Using these expressions we give an estimate for the ratio of disconnected to connected contributions for the strange part of the electromagnetic current. We give numerical examples for the effects of partial quenching, finite volume and twisting and suggest the use of different twists to check the size of finite volume effects. The main use of this work is expected to be for lattice QCD calculations of the hadronic vacuum polarization contribution to the muon anomalous magnetic moment.

    ↳ hep-lathep-phJHEP(2017)·33 citations
26. 26*

    Smeared quasidistributions in perturbation theory

    Christopher Monahan🇺🇸

    Quasi and pseudo distributions provide a new approach to determining parton distribution functions (PDFs) from first principles' calculations of quantum chromodynamics (QCD). Here I calculate the flavor nonsinglet unpolarized quasi distribution at one loop in perturbation theory, using the gradient flow to remove ultraviolet divergences. I demonstrate that, as expected, the gradient flow does not change the infrared structure of the quasi distribution at one loop and use the results to match the smeared matrix elements to those in the $\text{ms}$ scheme. This matching calculation is required to relate numerical results obtained from nonperturbative lattice QCD computations to light-front PDFs extracted from global analyses of experimental data.

    ↳ hep-lathep-phPRD(2018)·53 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.