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Hadronic Physics with Lepton and Hadron Beams

US/Eastern
F113 (CEBAF Center)

F113

CEBAF Center

12000 Jefferson Ave, Newport News, VA 23606
Alessandro Pilloni (Jefferson Lab), Jozef Dudek (JLab), Wally Melnitchouk (JLab)
Description
With the commencement of operations at the 12 GeV Upgraded Continuous Electron Beam Accelerator Facility at Jefferson Lab, and construction under way of the new Facility for Antiproton and Ion Research (FAIR) in Germany, a new era is opening up of high-precision experimental studies of hadron structure and spectroscopy. This meeting will bring together theoretical and experimental physicists from the lepton and hadron scattering communities to discuss synergies between the programs at these new facilities.
Poster
    • 08:45 09:00
      Welcome 15m F113

      F113

      CEBAF Center

      12000 Jefferson Ave, Newport News, VA 23606
      Speaker: Stuart Henderson (Argonne National Lab/Jefferson Lab)
    • 09:00 12:20
      Spectroscopy F113

      F113

      CEBAF Center

      12000 Jefferson Ave, Newport News, VA 23606
      Convener: Robert Edwards (Jefferson Lab)
      • 09:00
        GlueX results and overview over pentaquark searches 30m
        Speaker: Justin Stevens (College of William and Mary)
        Slides
      • 09:30
        JPAC program for hadron spectroscopy 30m
        Speaker: Dr Alessandro Pilloni (Jefferson Lab)
        Slides
      • 10:00
        Meson spectroscopy at CLAS and CLAS12 30m
        Speaker: Dr Lei Guo (Florida International University)
        Slides
      • 10:30
        Coffee break 30m
      • 11:00
        Overview of Baryon Spectroscopy (experiment) 30m
        Speaker: Prof. Volker Crede (Florida State University)
        Slides
      • 11:30
        Overview of Baryon Spectroscopy (theory) 30m
        Speaker: Michael Doring (GW)
        Slides
      • 12:00
        Finite-Energy Sum Rules in Pseudoscalar-meson Photoproduction off the Nucleon 20m
        Pseudoscalar-meson photoproduction on the nucleon is of current interest for hadron reaction studies. At low energies it provides information about the nucleon spectrum, while at high energies it reveals details of the residual hadron interactions due to cross-channel particle (Reggeon) exchanges. These two regimes are analytically connected, a feature that can be used to relate properties of resonances in the direct channel to Reggeons in the cross channels. In practice this can be accomplished through dispersion relations and finite-energy sum rules (FESR) [1]. At high energies ($E_{lab} > 4$ GeV), only the unpolarized differential cross section of eta photoproduction had been measured before, providing little constraints on theoretical models. The novel data from the GlueX experiment at Jefferson Lab provide us with invaluable new information. Even though photons couple to both isospin $I=0,1$ states, there are some notable differences between high energy photoproduction of the $\eta$ ($I=0$) and the $\pi^0$ ($I=1$). In contrast to the $\eta$, the $\pi^0$ differential cross section has a dip in the momentum transfer range, $-t\sim 0.5-0.6$ GeV${}^2$. The dip in $\pi^0$ photoproduction is expected to be associated with zeros in the residues of the dominant $\rho/\omega$ Regge exchanges [2,3]. It is an open question, what mechanisms are responsible for filling in the dip in eta photoproduction. It is often assumed that large unnatural contributions come into play. Finite-energy sum rules can provide clues here by relating the $t$-dependence of Regge amplitudes to that of the low-energy amplitude, usually described in terms of a finite number of partial waves. Early attempts could not resolve this issue due to the low quality of the data and the large uncertainties in the parametrization of the partial waves. Nowadays, however, there are several models that have been developed for the resonance region of $\eta$ photoproduction allowing for a more precise FESR analysis. The largest uncertainty in $\eta$ photoproduction stems from the unnatural parity Regge exchanges. These contributions can be isolated through photon beam asymmetry measurement. Such measurements are now possible with the GlueX experiment. The experiment uses linearly polarized photons with energy $E_{lab}\sim 9$ GeV and it has simultaneously measured $\eta$ and $\pi^0$ production. Those data will reduce the systematic uncertainties and provide a better constraint on Regge amplitudes. We have analyzed $\gamma N \to \eta N$ within a FESR framework [4]. Using these sum rules, one is able to obtain the t-dependence of the high-energy Regge residues using low-energy models. We found that a residue nonsense-wrong signature zero (NWSZ) seems to be lacking in the $t$-channel helicity flip amplitude of the $\rho$ residue. Including this in our model results in a mechanism where the dip in $\eta$ photoproduction is filled up with natural contributions, rather than genuinely assumed unnatural b exchange [5]. The predictions from this approach were then tested against the first GlueX results [6], confirming the above explanation: photon beam asymmetry close to $\Sigma=+1$ within the range $-t\approx 0.5-0.6$ GeV${}^2$ indicate that the absence of a dip in eta photoproduction should indeed be attributed to natural exchanges. [1] V. Mathieu, I. V. Danilkin, C. Fernández-Ramirez, M. R. Pennington, D. Schott, A. P. Szczepaniak, and G. Fox, Phys. Rev. D92, 074004 (2015). [2] V. Mathieu, G. Fox, and A. P. Szczepaniak, Phys. Rev. D92, 074013 (2015). [3] V. Mathieu et al., In preparation. [4] J. Nys, V. Mathieu, C. Fernández-Ramirez, A. N. Hiller Blin, A. Jackura, M. Mikhasenko, A. Pilloni, A. P. Szczepaniak, G. Fox, and J. Ryckebusch (JPAC), (2016), Phys.Rev. D95 (2017) no.3, 034014 [5] F. D. Gault and A. D. Martin, Nucl. Phys. B32, 429 (1971). [6] H. Al Ghoul et al. (GlueX) Phys. Rev. C95 (2017) no.4, 042201
        Speaker: Jannes Nys (Ghent University)
        Slides
    • 12:20 14:00
      Lunch 1h 40m F113

      F113

      CEBAF Center

      12000 Jefferson Ave, Newport News, VA 23606
    • 14:00 17:30
      Structure F113

      F113

      CEBAF Center

      12000 Jefferson Ave, Newport News, VA 23606
      Convener: Larry cardman (Jefferson Lab)
      • 14:00
        Results on DCVS 30m
        Speaker: Raphaël Dupré (IPN Orsay)
        Slides
      • 14:30
        Status of TMD extraction 30m
        Speaker: Andrea Signori (Jefferson Lab)
        Slides
      • 15:00
        PVDIS and Effective electron-quark couplings 30m
        Speaker: Dr Xiaochao Zheng (University of Virginia)
        Slides
      • 15:30
        Coffee break 30m
      • 16:00
        Two-photon exchange experiment: present and future 30m
        Speaker: Dr Douglas Hasell (M.I.T.)
        Slides
      • 16:30
        Proton radius 30m
        Speaker: Haiyan Gao (Duke University)
        Slides
      • 17:00
        Hadron structure at COMPASS 30m
        Speaker: Prof. Krzysztof Kurek (National Centre for Nuclear Research)
        Slides
    • 17:30 19:30
      Reception 2h F113

      F113

      CEBAF Center

      12000 Jefferson Ave, Newport News, VA 23606
    • 09:00 12:20
      Structure F113

      F113

      CEBAF Center

      12000 Jefferson Ave, Newport News, VA 23606
      Convener: Dr Wally Melnitchouk (Jefferson Lab)
      • 09:00
        Accessing the proton's tensor structure in inclusive DIS 30m
        Speaker: Alberto Accardi (Hampton U. and Jefferson Lab)
        Slides
      • 09:30
        Global QCD analysis / simultaneous PDF/FF fits 30m
        Speaker: Jacob Ethier (College of William and Mary/Jefferson Lab)
        Slides
      • 10:00
        The SeaQuest experiment 30m
        Speaker: Dr Markus Diefenthaler (Jefferson Lab)
        Slides
      • 10:30
        Coffee break + Group photo 30m
      • 11:00
        Nucleon spin / JLab program 30m
        Speaker: Prof. Karl Slifer (University of New Hampshire)
        Slides
      • 11:30
        3He as a laboratory to study neutron structure from elastic form factors to transverse momentum parton distributions 30m
        Speaker: Emanuele Pace (Tor Vergata U.)
        Slides
      • 12:00
        Hadron Mass Effects for Kaon Production on deuteron 20m
        The spin-independent cross section for semi-inclusive lepton-nucleon scattering are derived in the framework of collinear factorization, including the effects of the target and produced hadron masses at small momentum transfer squared $Q^2$. At leading order, the cross section factorizes into products of parton distributions and fragmentation functions evaluated in terms of new, mass-dependent scaling variables. This talk focuses on Kaon production at HERMES and COMPASS kinematics. In particular, hadron mass corrections for integrated kaon multiplicities measured by the two collaborations are shown to sizeably reduce the apparent large discrepancy between the results for both experiments.
        Speaker: Mr Juan Guerrero (Hampton University/Jefferson Lab)
        Slides
    • 12:20 14:00
      Lunch 1h 40m F113

      F113

      CEBAF Center

      12000 Jefferson Ave, Newport News, VA 23606
    • 14:00 18:00
      Spectroscopy F113

      F113

      CEBAF Center

      12000 Jefferson Ave, Newport News, VA 23606
      Convener: Jozef Dudek (JLab)
      • 14:00
        Overview of qPDF 30m
        Speaker: Dr Jianwei Qiu (Jefferson Lab)
        Slides
      • 14:30
        Electrocouplings at JLab6 and prospects for JLab12 30m
        Speaker: Viktor Mokeev (JLab)
        Slides
      • 15:00
        Hyperon spectroscopy 30m
        Speaker: Dr Karin Schoenning (Uppsala Universitet)
        Slides
      • 15:30
        Coffee break 30m
      • 16:00
        Hadron Spectroscopy at COMPASS 30m
        Speaker: Mr Stefan Wallner (TUM)
        Slides
      • 16:30
        Nucleon resonances in the timelike region at HADES 30m
        Speaker: Beatrice Ramstein (Institut de Physique Nucleaire)
        Slides
      • 17:00
        ISR measurements at BaBar 30m
        Speaker: Dr Konrad Griessinger (Institute for Nuclear Physics - Mainz University)
        Slides
    • 09:00 12:30
      Spectroscopy F113

      F113

      CEBAF Center

      12000 Jefferson Ave, Newport News, VA 23606
      Convener: Dr Alessandro Pilloni (Jefferson Lab)
      • 09:00
        Overview of XYZ theory 30m
        Speaker: Prof. Eric Swanson (Univ Pittsburgh)
        Slides
      • 09:30
        Production of charmonia and the PANDA program 30m
        Speaker: Mr Thomas Mehen (Duke University)
        Slides
      • 10:00
        Heavy spectroscopy on the lattice 30m
        Speaker: Dr Daniel Mohler (Helmholtz-Institut Mainz)
        Slides
      • 10:30
        Coffee break 30m
      • 11:00
        Modification of the static potential in the presence of a hadron 30m
        Speaker: Prof. Francesco Knechtli (University of Wuppertal)
        Slides
      • 11:30
        Hadron Spectroscopy at BESIII 30m
        Speaker: Dr Beijiang Liu (Institute of High Energy Physcis, CAS)
        Slides
      • 12:00
        Nuclear medium effects 30m
        Speaker: Gastao Krein (IFT)
        Slides
    • 12:30 14:00
      Lunch 1h 30m F113

      F113

      CEBAF Center

      12000 Jefferson Ave, Newport News, VA 23606
    • 14:00 17:00
      Structure F113

      F113

      CEBAF Center

      12000 Jefferson Ave, Newport News, VA 23606
      Convener: Gastao Krein
      • 14:00
        Transition form factors at BESIII 30m
        Speaker: Dr Christoph Redmer (Johannes Gutenberg-University Mainz)
        Slides
      • 14:30
        Experimental aspects of short range correlations 30m
        Speaker: Or Hen (MIT)
      • 15:00
        Theory of short range correlations 30m
        Speaker: Prof. Ruiz Arriola Enrique (Universidad de Granada)
        Slides
      • 15:30
        Coffee break 30m
      • 16:00
        Lattice progress for the muon g-2 30m
        Speaker: Prof. Harvey Meyer (Mainz University)
        Slides
      • 16:30
        Dispersive approaches to hadronic light-by-light scattering and the muon g-2 30m
        Speaker: Danilkin Igor (Mainz U.)
        Slides
    • 18:00 21:00
      Social dinner 3h F113

      F113

      CEBAF Center

      12000 Jefferson Ave, Newport News, VA 23606

      P.F. Chang

    • 09:00 11:00
      Structure F113

      F113

      CEBAF Center

      12000 Jefferson Ave, Newport News, VA 23606
      Convener: Dr David Richards (Jefferson Lab)
      • 09:00
        Light spectroscopy on the Lattice 30m
        Speaker: Raul Briceno (Jefferson Lab)
        Slides
      • 09:30
        PDFs and moments in lattice QCD 30m
        Speaker: Prof. Huey-Wen Lin (Michigan State University)
        Slides
      • 10:00
        Quasi-PDFs and exploration of pseudo-PDFs 30m
        Speaker: Anatoly Radyushkin (ODU/JLab)
        Slides
      • 10:30
        Form factors on the lattice 30m
        Speaker: Bipasha Chakraborty (Postdoctoral researcher)
        Slides
    • 11:00 11:30
      Coffee break 30m F113

      F113

      CEBAF Center

      12000 Jefferson Ave, Newport News, VA 23606
    • 11:30 12:30
      QWeak seminar 1h CC Auditorium

      CC Auditorium

      CEBAF Center

      12000 Jefferson Ave, Newport News, VA 23606
      Speaker: Mark Pitt (Virginia Tech)
    • 12:30 14:00
      Lunch 1h 30m F113

      F113

      CEBAF Center

      12000 Jefferson Ave, Newport News, VA 23606
    • 14:00 16:30
      Future facilities F113

      F113

      CEBAF Center

      12000 Jefferson Ave, Newport News, VA 23606
      Convener: David Gaskell (Jefferson Lab)
      • 14:00
        Prospects for Belle II 30m
        Speaker: Dr Anselm Vossen (Indiana University)
        Slides
      • 14:30
        Prospects at JPARC 30m
        Speaker: Prof. Shunzo Kumano (KEK/J-PARC)
        Slides
      • 15:00
        Coffee break 30m
      • 15:30
        Prospects for MESA 30m
        Speaker: Dr Sabato Stefano Caiazza (JGU Mainz)
        Slides
      • 16:00
        Prospects for EIC 30m
        Speaker: Rikutaro Yoshida (Jefferson Lab)
        Slides
    • 16:30 16:45
      Conclusing remarks 15m F113

      F113

      CEBAF Center

      12000 Jefferson Ave, Newport News, VA 23606