1. Hadronic Physics Report from the Town Meeting October 25 Sebastian Kuhn, Old Dominion University

2. Agenda Town Meeting “Hadronic Physics” * 7:00 Medium Energy Physics Overview - Roy Holt * 7:40 The future of hadron physics - Craig Roberts * 8:00 Nucleon structure with Jefferson Lab at 12 GeV - Latifa Elouadhriri * 8:20 QCD and nuclei - Larry Weinstein * 8:40 The RHIC spin program - Elke Aschenauer * 9:00 Hadronic physics at other facilities - Jen-Chieh Peng * 9:20 Open Mic - opportunity to present a few slides o Mark Pitt o Seamus Riordan * 9:40 Discussion and Closeout * 10:00 Adjourn http://www.odu.edu/~skuhn/HadronTownMeet

3. Central Questions in Hadronic Physics What is the Nature of Confinement? Spectroscopy and form factors of hadrons The role of gluonic excitations Hadronization What is the Internal Structure of the Nucleon? (1D → 3D) How are spin and momentum distributed among partons? Correlations and 3D structure Orbital angular momentum of quarks How do Nuclear Properties Emerge from Quarks and Gluons? Are nucleons modified inside the nucleus?

4. Hadrons C.D. Roberts, Prog. Part. Nucl. Phys. 61 (2008) 50Prog. Part. Nucl. Phys. 61 (2008) 50 M. Bhagwat & P.C. Tandy, AIP Conf.Proc. 842 (2006) 225-227AIP Conf.Proc. 842 (2006) 225-227 *Dynamical Chiral Symmetry Breaking

5. Hadrons Meson Spectroscopy -> Anomalies Search for exotic hadrons, e.g. hybrid mesons Precision experimental study of valence region, and theoretical computation of distribution functions and distribution amplitudes Accurate elastic and transition form factor data drive paradigmatic shifts in our pictures of hadrons and their structure; e.g., role of orbital angular momentum and nonpointlike diquark correlations scale at which p-QCD effects become evident strangeness content meson-cloud effects

6. Valence Glue NSAC milestone HP15 (2018) Plot credit: NP2010 Exotics and hybrids are truly novel states They’re not matter as we know it In possessing valence glue, such states confound the distinction between matter fields and force carriers But they’re only exotic in a quantum mechanics based on constituent-quark degrees-of- freedom They’re natural in quantum field theory, far from the non- relativistic (potential model) limit No symmetry forbids them, QCD interaction promotes them, so they very probably exist! Excited Glue

7. Longitudinal Structure NSAC milestone HP14 (2018) JLab@12 GeV has unique capability to define the valence region Helicity conservation Scalar diquark SU(6) +BONuS 12 GeV Projected E.C. Aschenauer DIS RHIC 200 GeV RHIC 500 GeV forward 

8. Transverse Quark Motion NSAC Milestone HP13 (2015) “Test unique QCD predictions for relations between single- transverse spin phenomena in p-p scattering and those observed in deep-inelastic scattering.” JLab @12 GeV, COMPASS-II, RHIC-spin, polarized FNAL, FAIR/PANDA… P hT SIDIS Drell-Yan

9. Nucleon Tomography Quark angular momentum (Ji’s sum rule) X. Ji, Phy.Rev.Lett.78,610(1997) J quark ( H(x, ,t=0) + E(x, ,t=0) ) x dx = J quark 1 =1/2  L z

10. Nucleons in Nuclei Flavor, isospin and spin dependence of EMC effect? JLab@12, Drell-Yan, MINERvA N. Fomin et al, PRL 108, 092502 (2012) SRC Scaling factors x B ≥ 1.5 11 JLab 12 GeV experiments, incl. nuclear structure, nucleon modifications and Color Transparency J. Seeley et al, PRL 103 (2009) L. Weinstein et al, PRL 106, 052301 (2011), J. Arrington et al, arXiv:1206.6343

11. CT, Hadronization and All That 12 GeV Anticipated Data: 10 35 cm -2 s -1 CEBAF @ 12 GeV + CLAS12: ideal facility to study light quark hadronization:  What governs the transition of quarks and gluons into pions and nucleons? NSAC 2007 W. Brooks, K. Hafidi, K. Joo et al. Production length Parton energy loss Formation length Color transparency Hadron multiplicity p T broadening

12. Jefferson Lab at 12 GeV Scope of the project includes: Doubling the accelerator beam energy New experimental Hall and beamline Upgrades to existing Experimental Halls Maintain capability to deliver lower pass beam energies: 2.2, 4.4, 6.6…. New Hall Add arc Enhanced capabilities in existing Halls Add 5 cryomodules 20 cryomodules Upgrade arc magnets and supplies CHL upgrade Upgrade is designed to build on existing facility: vast majority of accelerator and experimental equipment have continued use The completion of the 12 GeV Upgrade of CEBAF was ranked the highest priority in the 2007 NSAC Long Range Plan.

13. Jefferson Lab at 12 GeV Hall D – exploring origin of confinement by studying hybrid mesons and rare decays Hall B – understanding nucleon structure via PDFs, TMDs and generalized parton distributions Hall C – precision determination of valence quark properties in nucleons and nuclei Hall A – form factors, GPDs, nucleon structure Future new experiments (e.g., SoLID and MOLLER)

14. 12 GeV – Upgrade Status Hall D – equipment installation in progress Two high-gradient 12 GeV cryomodules installed and delivering high quality beam; third moved to tunnel and delivering high quality beam; third moved to tunnel CHL-2 equipment (compressors, coldboxes) in place Superconducting magnets under construction All major detector systems under construction All 48 Hall D BCAL modules on site (U. Regina) Region 2 DC CLAS12 completed (Old Dominion U.) Performance Index: schedule 95% ; cost 96% Hall C Dipole Prototype Coil Hall B Pre-Shower Calorimeter Central Helium Liquefier-2 installation Third C-100 Cryomodule transferred to tunnel Hall D Interior CLAS12 R2 final DC

15. Other Physics Topics @ JLab 12 GeV Testing the Standard Model Parity Violating DIS: SoLID (and a rich program in hadronic Physics) Parity Violating Möller Scattering Direct Search for “Dark Photons” APEX, Dark light, HPS

16. RHIC Spin Program DSSV: arXiv:0904.3821 DSSV+: DSSV+COMPASS DSSV++: DSSV+ & RHIC 2009 DIS RHIC 200 GeV RHIC 500 GeV forward  RHIC W±-data will constrain and Transverse Asymmetries

17. Other Facilities Fermilab: Drell-Yan (pol. and unpol.), Neutrinos (Miner a), Project X? Hi  S (TUNL), Mainz, Bonn: Spectroscopy, ChPT Tests, form factors, polarizabilities few-body nuclei COMPASS II (CERN): 1-3D SFs, Drell-Yan, GPDs, Primakoff GSI / FAIR (Panda, PAX,…): Hadron Spectroscopy, Drell-Yan J-PARC (strangeness), BES, PSI, … …and ongoing analyses of existing data (JLAB, HERMES, RHIC,…)

18. Theory Kamano, Nakamura, Lee et al., 2012 NSAC milestones HP3 (2009) completed, HP7 (2012) Baryon spectrum from EBAC & Bonn-Ga (PDG12) Lattice-QCD Significant progress in the last five years This must continue Bound-state problem in continuum quantum field theory Significant progress, too Must also continue Completed and planned experiments will deliver the pieces of the puzzle that is QCD. Theory must be deve loped to explain how they fit together Hadron physics must deploy a diverse array of probes and tools in order to define and solve the problems of confinement and its relationship with Dynamical Chiral Symmetry Breaking

19. Summary and Outlook Hadronic Physics is poised for an exciting time, major breakthroughs There is only one high-energy, high-intensity electron scattering lab left worldwide: Jefferson Lab @ 12 GeV Large investment, extensive program (>7 years) Nearing completion, large contributions from users >50 approved proposals with 600 authors and 125 spokespersons RHIC spin program will provide complementary data Many other labs can make important contributions Long-term goal for the community: EIC > 7 years!