Thu·Jun 13, 2019Thursday·June 13, 2019

1. 01*

   New Physics Probes: Atomic Parity Violation, Polarized Electron Scattering and Neutrino-Nucleus Coherent Scattering

   Giorgio Arcadi🇮🇹 · Manfred Lindner🇩🇪 · Jessica Martins🇧🇷 · Farinaldo S. Queiroz🇧🇷

   Atomic Parity Violation (APV) is usually quantified in terms of the weak nuclear charge $Q_W$ of a nucleus, which depends on the coupling strength between the atomic electrons and quarks. In this work, we review the importance of APV to probing new physics using effective field theory. Furthermore, using $SU(2)$ invariance, we correlate our findings with those from neutrino-nucleus coherent scattering. Moreover, we investigate signs of parity violation in polarized electron scattering and show how precise measurements on the Weinberg angle, $\sin {\theta }_W$, will give rise to competitive bounds on light mediators over a wide range of masses and interactions strength. Lastly, apply our bounds to several models namely, Dark Z, Two Higgs Doublet Model-$U(1{)}_X$ and 3-3-1, considering both light and heavy mediator regimes.

   hep-phhep-exnucl-thNPB(2020)·56 citations
2. 02*

   Moments of angular distribution and beam asymmetries in $\eta {\pi }^0$ photoproduction at GlueX

   V. Mathieu🇺🇸 · M. Albaladejo🇺🇸 · C. Fernández-Ramírez🇲🇽 · A. W. Jackura🇺🇸 · M. Mikhasenko🇨🇭 · A. Pilloni🇮🇹 · A. P. Szczepaniak (JPAC collaboration)🇺🇸

   In the search for exotic mesons, the GlueX collaboration will soon extract moments of the $\eta {\pi }^0$ angular distribution. In the perspective of these results, we generalize the formalism of moment extraction to the case in which the two mesons are produced with a linearly polarized beam, and build a model for the reaction $\vec{\gamma }p\to \eta {\pi }^{0}p$. The model includes resonant $S$-, $P$-, $D$-waves in $\eta {\pi }^0$, produced by natural exchanges. Moments of the $\eta {\pi }^0$ angular distribution are computed with and without the $P$-wave, to illustrate the sensitivity to exotic resonances. Although little sensitivity to the $P$-wave is found in moments of even angular momentum, moments of odd angular momentum are proportional to the interference between the $P$-wave and the dominant $S$- and $D$-waves. We also generalize the definition of the beam asymmetry for two mesons photoproduction and show that, when the meson momenta are perpendicular to the reaction plane, the beam asymmetry enhances the sensitivity to the exotic $P$-wave.

   hep-phPRD(2019)·47 citations
3. 03*

   Primordial Extremal Black Holes as Dark Matter

   Yang Bai🇺🇸 · Nicholas Orlofsky🇺🇸

   We show that primordial (nearly) extremal black holes with a wide range of masses from the Planck scale to around $10^9$ g could be cosmologically stable and explain dark matter, given a dark electromagnetism and a heavy dark electron. For individual black holes, Hawking radiation and Schwinger discharge processes are suppressed by near-extremality and the heaviness of the dark electron, respectively. In contrast, the merger events of binary systems provide an opportunity to directly observe Hawking radiation. Because the merger products are not extremal, they rapidly evaporate and produce transient high-energy neutrino and gamma ray signals that can be observed at telescopes like IceCube and HAWC. The relationship between the near-extremal black hole and dark electron masses could also shed light on the weak gravity conjecture.

   hep-phastro-ph.COastro-ph.HEhep-thPRD(2020)·92 citations
4. 04*

   Photoproduction of $J/\psi$ with forward hadron tagging in hadronic collisions

   Tichouk🇨🇳 · Hao Sun🇨🇳 · Xuan Luo🇨🇳

   We study the photoproduction of $J/\psi$ using the NRQCD formalism with forward hadron tagging at the Large Hadron Collider. We estimate the total cross sections and event rates with and without nuclear shadowing effects in high energy proton-proton, proton-nucleus and nucleus-nucleus collisions. Our results show that the processes which involve $J/\psi$ photoproduction depend on the choice of forward detector acceptances $\xi$. Under some precise cut of ${\mathrm{p}}_{\mathrm{T}}^{J/\psi }$ and ${\mathrm{z}}^{J/\psi }$ kinematic variables, we find that the distributions of photoproduction of $J/\psi$ are led by the Fock state ${}^1{\mathrm{S}}_0^{[8]}$ or ${}^3{\mathrm{S}}_1^{[1]}$. The total cross sections and event rates will be smaller if the nuclear shadowing effects are considered. The processes give a crucial photoproduction signature at the LHC with forward detector acceptances. The exploration and the detection of the interactions will be useful for studying the mechanism of heavy quarkonium production.

   hep-phPRD(2019)·3 citations
5. 05*

   Probing the Sivers asymmetries through $J/\psi$ photoproduction in ${\mathrm{p}}^{\uparrow }\mathrm{p}$ collision with forward proton tagging

   Hao Sun🇨🇳 · Tichouk🇨🇳 · Xuan Luo🇨🇳

   In this paper we probe the Sivers asymmetries through $J/\psi$ photoproduction in ${\mathrm{p}}^{\uparrow }\mathrm{p}$ collision within the non-relativistic QCD framework, based on color octet model and the Transverse Momentum Dependent Parton Distributions (TMDs). Both the DGLAP evolution and the TMD evolution are included. The intensity and the sign of the Sivers asymmetry is strongly related on evolution model used to investigate the Gluon Sivers Function (GSF). A sizable asymmetry is obtained as a function of the rapidity, $\log ({\mathrm{x}}_{\gamma })$ or $\log ({\mathrm{x}}_{\mathrm{g}})$ dependence using a recent parametrization of GSF at the RHIC and AFTER@LHC experiments with the LHC planned forward detector acceptances.

   hep-phPRD(2019)·3 citations
6. 06*

   Double quarkonium hadroproduction as a probe of gluon Sivers function

   Xuan Luo🇨🇳 · Hao Sun🇨🇳 · Tichouk🇨🇳

   The prediction of single spin asymmetry (SSA) in double $J/\psi$ production in proton-proton collision is given out within the framework of non-relativistic QCD, using the recently obtained best fit parameters for the gluon Sivers function extracted from PHENIX data in $\mathrm{p}+{\mathrm{p}}^{\uparrow }\to {\pi }^0+\mathrm{X}$. The color singlet state ${}^3{\mathrm{S}}_1^{(1)}$ and color octet state ${}^3{\mathrm{S}}_1^{(8)}$ are considered to the SSA contribution in the double $J/\psi$ hadroproduction. Our result shows that a sizable asymmetry can be estimated as functions of different kinematic variables.

   hep-ph0 citations
7. 07*

   Top FCNC interactions through dimension six four-fermion operators at the electron proton collider

   Wei Liu🇬🇧 · Hao Sun🇨🇳

   We investigate the flavour changing neutral currents (FCNC) generated by dimension six four-fermion operators at the Large Hadron-Electron Collider (LHeC) proposed at CERN in an effective approach. This is performed by monte carlo analysis at the full detector level, as the background is successfully reduced by using invariant mass scheme to require the final states to reconstruct the mass (transverse mass) of the top quark (W boson). Our analysis shows that the future electron proton colliders like the LHeC can probe competitive limits for the top FCNC dimension six four fermion operators such as $C_{lq}^{(1)ee31}<0.0647$, $C_{lu}^{ee31}<0.109$, $C_{lequ}^{(1)ee31}<0.217$ and $C_{lequ}^{(3)ee31}<0.0209$ in the Warsaw basis.

   hep-phPRD(2019)·14 citations
8. 08*

   Possible Molecular States Composed of Doubly Charmed Baryons with Couple-channel Effect

   Bin Yang🇨🇳 · Lu Meng🇨🇳 · Shi-Lin Zhu🇨🇳

   We systematically investigate the possible molecular states composed of (1) two spin-$\frac{3}{2}$ doubly charmed baryons, and (2) a pair of spin-$\frac{3}{2}$ and spin-$\frac{1}{2}$ doubly charmed baryons. The one-boson-exchange (OBE) model is used to describe the potential between two baryons. The channel mixing effect is considered for the systems with the same quantum number $(I(J^P))$ but different total spin ($S$) and orbital angular momenta ($L$). We also study the channel mixing effect among the systems composed of various doubly charmed baryons if they have the same quantum number. Many of the systems are good candidates of molecular states.

   hep-phhep-exhep-latnucl-thEPJA(2020)·15 citations
9. 09*

   Signatures of chiral symmetry restoration in dilepton production

   Chihiro Sasaki🇵🇱

   We study the structural change of the vector spectral function and integrated production rates of dileptons in the presence of the chiral mixing induced exclusively at finite density. The mixing produces multiple bumps and peaks around the vacuum masses of the $\rho ,\omega$ and $\varphi$ resonances in the spectral function. The arising modification becomes pronounced when the mass difference between parity partners decreases. In particular, the emergent enhancement around the vacuum $\varphi$ meson in the production rates serves as an excellent signature of the partially-restored chiral symmetry in heavy-ion collisions.

   hep-phnucl-thPLB(2020)·21 citations
10. 10*

    Transport anomalies near the QCD phase transition at finite density

    B.O. Kerbikov🇷🇺

    We show that at finite density pressure-pressure and current-current correlators exhibit divergences at $T_c$ owing to the fluctuations of the diquark field. Specifically, this leads to a significant excess of the soft photon production rate near $T_c$.

    hep-phnucl-th0 citations
11. 11*

    A phase of confined electroweak force in the early Universe

    Joshua Berger🇺🇸 · Andrew J. Long🇺🇸 · Jessica Turner🇺🇸

    We consider a modified cosmological history in which the presence of beyond-the-Standard-Model physics causes the weak gauge sector, $\mathrm{SU}(2{)}_L$, to confine before it is Higgsed. Under the assumption of chiral symmetry breaking, quark and lepton weak doublets form condensates that break the global symmetries of the Standard Model, including baryon and lepton number, down to a $\mathrm{U}(1)$ subgroup under which only the weak singlet fermions and Higgs transform. The weakly-coupled gauge group $\mathrm{SU}(3{)}_c\times \mathrm{U}(1{)}_Y$ is also broken to an $\mathrm{SU}(2{)}_c\times \mathrm{U}(1{)}_Q$ gauge group. The light states include (pseudo-)Goldstone bosons of the global symmetry breaking, mostly-elementary fermions primarily composed of the weak singlet quarks and leptons, and the gauge bosons of the weakly-coupled gauge group. We discuss possible signatures from early Universe cosmology including gravitational wave radiation, topological defects, and baryogenesis.

    hep-phastro-ph.COhep-thPRD(2019)·15 citations
12. 12*

    Dark matter and flavor changing in the flipped 3-3-1 model

    D. T. Huong🇻🇳 · D. N. Dinh🇻🇳 · L. D. Thien🇻🇳 · Phung Van Dong🇻🇳

    The flipped 3-3-1 model discriminates lepton families instead of the quark ones in normal sense, where the left-handed leptons are in two triplets plus one sextet while the left-handed quarks are in antitriplets, under $SU(3{)}_L$. We investigate a minimal setup of this model and determine novel consequences of dark matter stability, neutrino mass generation, and lepton flavor violation. Indeed, the model conserves a noncommutative $B-L$ symmetry, which prevents the unwanted vacua and interactions and provides the matter parity and dark matter candidates that along with normal matter form gauge multiplets. The neutrinos obtain suitable masses via a type I and II seesaw mechanism. The nonuniversal couplings of $Z^{\prime }$ with leptons govern lepton flavor violating processes such as $\mu \to 3e$, $\mu \to e{\bar{\nu }}_{\mu }{\nu }_e$, $\mu$-$e$ conversion in nuclei, semileptonic $\tau \to \mu (e)$ decays, as well as the nonstandard interactions of neutrinos with matter. This $Z^{\prime }$ may also set the dark matter observables and give rise to the LHC dilepton and dijet signals.

    hep-phJHEP(2019)·41 citations
13. 13*

    Nambu-Goldstone Affleck-Dine Baryogenesis

    Keisuke Harigaya🇺🇸

    The Affleck-Dine mechanism creates the baryon asymmetry of the universe from an angular motion of a complex scalar field. The mechanism is efficient and allows for a low reheating temperature of the universe if the scalar field has a flat potential along its radial direction. We consider a possibility where the scalar field is a pseudo-Nambu-Goldstone boson arising from spontaneous breaking of an approximate global symmetry, so that the flatness of the potential is naturally understood. We construct a concrete realization of the idea based on chiral symmetry breaking in an SU(N) gauge theory. The Peccei-Quinn mechanism can be consistently incorporated into the model. We also comment on a possible impact of the model on early universe physics.

    hep-phastro-ph.COJHEP(2019)·13 citations
14. 14*

    Probing a Scalar Singlet-Catalyzed Electroweak Phase Transition with Resonant Di-Higgs Production in the $4b$ Channel

    Hao-Lin Li🇨🇳 · Michael Ramsey-Musolf🇺🇸 · Stéphane Willocq🇺🇸

    We investigate the prospective reach of the 14 TeV HL-LHC for resonant production of a heavy Higgs boson that decays to two SM-like Higgs bosons in the $4b$ final state in the scalar singlet extended Standard Model. We focus on the reach for choices of parameters yielding a strong first order electroweak phase transition. The event selection follows the $4b$ analysis by the ATLAS Collaboration, enhanced with the use of a boosted decision tree method to optimize the discrimination between signal and background events. The output of the multivariate discriminant is used directly in the statistical analysis. The prospective reach of the $4b$ channel is compatible with previous projections for the $bb\gamma \gamma$ and $4\tau$ channels for heavy Higgs boson mass $m_2$ below 500 GeV and superior to these channels for $m_2>500$ GeV. With 3 ab${}^{-1}$ of integrated luminosity, it is possible to discover the heavy Higgs boson in the $4b$ channel for $m_2<500$ GeV in regions of parameter space yielding a strong first order electroweak phase transition and satisfying all other phenomenological constraints.

    hep-phhep-exPRD(2019)·51 citations
15. 15*

    Constraining the SMEFT with Bayesian reweighting

    Samuel van Beek🇳🇱 · Emanuele R. Nocera🇳🇱 · Juan Rojo🇳🇱 · Emma Slade🇬🇧

    We illustrate how Bayesian reweighting can be used to incorporate the constraints provided by new measurements into a global Monte Carlo analysis of the Standard Model Effective Field Theory (SMEFT). This method, extensively applied to study the impact of new data on the parton distribution functions of the proton, is here validated by means of our recent SMEFiT analysis of the top quark sector. We show how, under well-defined conditions and for the SMEFT operators directly sensitive to the new data, the reweighting procedure is equivalent to a corresponding new fit. We quantify the amount of information added to the SMEFT parameter space by means of the Shannon entropy and of the Kolmogorov-Smirnov statistic. We investigate the dependence of our results upon the choice of either the NNPDF or the Giele-Keller expressions of the weights.

    hep-phhep-exSciPost Phys.(2019)·52 citations
16. 16*

    Calculations for deep inelastic scattering using fast interpolation grid techniques at NNLO in QCD and the extraction of ${\alpha }_s$ from HERA data

    D. Britzger🇩🇪 · J. Currie🇬🇧 · A. Gehrmann-De Ridder🇨🇭 · T. Gehrmann🇨🇭 · E.W.N. Glover🇬🇧 · C. Gwenlan🇬🇧 · A. Huss🇨🇭 · T. Morgan🇬🇧 · J. Niehues🇬🇧 · J. Pires🇵🇹 · K. Rabbertz🇩🇪 · M.R. Sutton🇬🇧

    The extension of interpolation-grid frameworks for perturbative QCD calculations at next-to-next-to-leading order (NNLO) is presented for deep inelastic scattering (DIS) processes. A fast and flexible evaluation of higher-order predictions for any a posteriori choice of parton distribution functions (PDFs) or value of the strong coupling constant is essential in iterative fitting procedures to extract PDFs and Standard Model parameters as well as for a detailed study of the scale dependence. The APPLfast project, described here, provides a generic interface between the parton-level Monte Carlo program NNLOJET and both the APPLgrid and fastNLO libraries for the production of interpolation grids at NNLO accuracy. Details of the interface for DIS processes are presented together with the required interpolation grids at NNLO, which are made available. They cover numerous inclusive jet measurements by the H1 and ZEUS experiments at HERA. An extraction of the strong coupling constant is performed as an application of the use of such grids and a best-fit value of ${\alpha }_s(M_Z)=0.1178(15{)}_{\text{exp}}(21{)}_{\text{th}}$ is obtained using the HERA inclusive jet cross section data.

    hep-phEPJC(2019)·50 citations
17. 17*

    Double spin asymmetry in dihadron production in SIDIS off the longitudinally polarized nucleon target

    Xuan Luo🇨🇳 · Hao Sun🇨🇳 · Jing Li🇨🇳 · Yi-Ling Xie🇨🇳 · Tichouk🇨🇳

    In this paper we study the double longitudinal spin asymmetry of dihadron production in semi-inclusive deep inelastic scattering (SIDIS). We calculate a unknown twist-3 dihadron fragmentation function ${\tilde{D}}^{\sphericalangle }$ within a spectator model which has been used successfully in describing the dihadron production in both the unpolarized and the single polarized processes. The collinear picture, in which the transverse momentum of the final state hadron pair is integrated out, has been considered. The $\cos {\varphi }_R$ azimuthal asymmetry arises from the coupling $e_L{H}_1^{\sphericalangle }$ and the coupling $g_1{\tilde{D}}^{\sphericalangle }$ is studied. We estimate the $\cos {\varphi }_R$ asymmetry at the kinematics of COMPASS and compare with the data. The prediction at the future Electron Ion Collider (EIC) has also been presented.

    hep-phPRD(2019)·7 citations
18. 18*

    Relation between the continuum threshold and the Polyakov loop with the QCD deconfinement transition

    J.P. Carlomagno🇦🇷 · M. Loewe🇨🇱

    Using vector and axial-vector correlators within finite energy sum rules with inputs from a chiral quark model, coupled to the Polyakov loop, with nonlocal vector interactions, we extend our previous work to confirm the equivalence between the continuum threshold $s_0$ and the trace of the Polyakov loop $\Phi$ as order parameters for the deconfinement transition at finite temperature $T$ and quark chemical potential $\mu$. The obtained results are in agreement with our initial conclusion, where we showed that $s_0(T,\mu )$ and $\Phi (T,\mu )$ provide the same information for the QCD deconfinement transition.

    hep-phPRD(2019)·2 citations
19. 19*

    Clustering of primordial black holes with non-Gaussian initial fluctuations

    Teruaki Suyama🇯🇵 · Shuichiro Yokoyama🇯🇵

    We formulate the two-point correlation function of primordial black holes (PBHs) at their formation time, based on the functional integration approach which has often been used in the context of halo clustering. We find that PBH clustering on super-Hubble scales could never be induced in the case where the initial primordial fluctuations are Gaussian, while it can be enhanced by the so-called local-type trispectrum (four-point correlation function) of the primordial curvature perturbations.

    ↳ astro-ph.COgr-qchep-phhep-thPTEP(2019)·63 citations
20. 20*

    Asymmetric shockwave collisions in ${\text{AdS}}_5$

    Sebastian Waeber🇩🇪 · Andreas Rabenstein🇩🇪 · Andreas Schäfer🇩🇪 · Laurence G. Yaffe🇺🇸

    Collisions of asymmetric planar shocks in maximally supersymmetric Yang-Mills theory are studied via their dual gravitational formulation in asymptotically anti-de Sitter spacetime. The post-collision hydrodynamic flow is found to be very well described by appropriate means of the results of symmetric shock collisions. This study extends, to asymmetric collisions, previous work of Chesler, Kilbertus, and van der Schee examining the special case of symmetric collisions. Given the universal description of hydrodynamic flow produced by asymmetric planar collisions one can model, quantitatively, non-planar, non-central collisions of highly Lorentz contracted projectiles without the need for computing, holographically, collisions of finite size projectiles with very large aspect ratios. This paper also contains a pedagogical description of the computational methods and software used to compute shockwave collisions using pseudo-spectral methods, supplementing the earlier overview of Chesler and Yaffe.

    ↳ hep-thgr-qchep-phnucl-thJHEP(2019)·18 citations
21. 21*

    Post-Minkowskian Hamiltonians in Modified Theories of Gravity

    Andrea Cristofoli🇩🇰

    The aim of this note is to describe the computation of post-Minkwoskian Hamiltonians in modified theories of gravity. Exploiting a recent relation between amplitudes of massive scalars and Hamiltonians for relativistic point-particles, we define a post-Minkowskian potential at second order in Newton's constant arising from ${\mathcal{R}}^3$ modifications in General Relativity. Using this result we calculate the associated contribution to the scattering angle for binary black holes at second post-Minkowskian order, showing agreement in the non relativistic limit with previous results for the bending angle of a massless particle around a static massive source in ${\mathcal{R}}^3$ theories.

    ↳ hep-thgr-qchep-phPLB(2020)·26 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.