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Hadronic Physics. Report from the Town Meeting October 25 Sebastian Kuhn, Old Dominion University. Agenda. Town Meeting “ Hadronic Physics” * 7:00 Medium Energy Physics Overview - Roy Holt * 7:40 The future of hadron physics - Craig Roberts

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hadronic physics

Hadronic Physics

Report from the Town Meeting October 25

Sebastian Kuhn, Old Dominion University


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 - LatifaElouadhriri

* 8:20 QCD and nuclei - Larry Weinstein

* 8:40 The RHIC spin program - ElkeAschenauer

* 9:00 Hadronic physics at other facilities - Jen-ChiehPeng

* 9:20 Open Mic - opportunity to present a few slides

o Mark Pitt

o Seamus Riordan

* 9:40 Discussion and Closeout

* 10:00 Adjourn


central questions in hadronic physics
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?

Overarching Science Challenges for the coming decade: 2013-2022

Discover meaning of confinement, and its relationship to DCSB* – the origin of visible mass

*Dynamical Chiral Symmetry Breaking

C.D. Roberts, Prog. Part. Nucl. Phys. 61 (2008) 50

M. Bhagwat & P.C. Tandy, AIP Conf.Proc. 842 (2006) 225-227

  • 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 nonpointlikediquark correlations
    • scale at which p-QCD effects become evident
    • strangeness content
    • meson-cloud effects

9 Experiments @12 GeVJLab

valence glue
Valence Glue
  • 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!

NSAC milestone HP15 (2018)

Excited Glue

Plot credit: NP2010

240 “PAC days” approved

GlueX and Hall B @12 GeVJLab

longitudinal structure

9 Experiments @12 GeVJLab




[email protected] GeV has unique capability to define the valence region

Scalar diquark

Longitudinal Structure

+ pp program at RHIC

+ FNAL, ….

NSAC milestone HP14 (2018)

+BONuS 12 GeV Projected


500 GeV


forward h


200 GeV

transverse quark motion
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…




nucleon tomography

>9 Experiments @12 GeVJLab

Quark angular momentum (Ji’s sum rule)


( H(x,x,t=0) + E(x,x,t=0) ) x dx = Jquark

=1/2 DS+ D Lz

X. Ji, Phy.Rev.Lett.78,610(1997)


Nucleon Tomography
nucleons in nuclei
Nucleons in Nuclei

L. Weinstein et al, PRL 106, 052301 (2011) , J. Arrington et al, arXiv:1206.6343

J. Seeley et al, PRL 103 (2009)

SRC Scaling factors xB≥ 1.5

N. Fomin et al, PRL 108, 092502 (2012)

11 JLab 12 GeVexperiments, incl. nuclear structure,nucleon modifications

and Color Transparency

ct hadronization and all that

12 GeV Anticipated Data: 1035 cm-2s-1

CT, Hadronization and All That
  • What governs the transition of quarks and gluons into pions and nucleons? NSAC 2007

Production length

Parton energy loss

Formation length

Color transparency

Hadron multiplicity

pT broadening

CEBAF @ 12 GeV + CLAS12: ideal facility to study light quark hadronization:

W. Brooks, K. Hafidi, K. Jooet al.

jefferson lab at 12 gev

New Hall

Add 5 cryomodules

20 cryomodules

Add arc

20 cryomodules

Add 5 cryomodules

Enhanced capabilities

in existing Halls

Jefferson Lab at 12 GeV

Upgrade is designed to build on existing facility: vast majority of accelerator and experimental equipment have continued use

Upgrade arc magnets

and supplies

CHL upgrade

Maintain capability to deliver lower pass beam energies: 2.2, 4.4, 6.6….

The completion of the

12 GeV Upgrade of CEBAF was ranked the highest priority in the 2007 NSAC Long Range Plan.

  • Scope of the project includes:
  • Doubling the accelerator beam energy
  • New experimental Hall and beamline
  • Upgrades to existing Experimental Halls
jefferson lab at 12 gev1
Jefferson Lab at 12 GeV

Hall D – exploring origin ofconfinementby studying hybrid mesons and rare decays

Hall B – understanding nucleon structure viaPDFs, 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., SoLIDand MOLLER)

12 gev upgrade status
12 GeV – Upgrade Status

Hall D Interior

  • Hall D – equipment installation in progress
  • Two high-gradient 12 GeVcryomodules installed

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%

Third C-100 Cryomodule

transferred to tunnel

Hall B Pre-Shower


Central Helium Liquefier-2



final DC

Hall C Dipole

Prototype Coil

other physics topics @ jlab 12 gev
Other Physics Topics @ JLab 12 GeV
  • Testing the Standard Model
    • Parity Violating DIS: SoLID(and a rich program in hadronic Physics)
    • Parity Violating MöllerScattering
  • Direct Search for “Dark Photons”
    • APEX, Dark light, HPS
rhic spin program
RHIC Spin Program

DSSV: arXiv:0904.3821


DSSV++: DSSV+ & RHIC 2009

RHIC W±-data will constrainand

Transverse Asymmetries


500 GeV


forward h


200 GeV

other facilities
Other Facilities
  • Fermilab: Drell-Yan (pol. and unpol.), Neutrinos (Minerna), Project X?
  • HigS(TUNL), Mainz, Bonn: Spectroscopy, ChPT Tests, form factors, polarizabilitiesfew-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,…)

NSAC milestones HP3 (2009) completed, HP7 (2012)

  • 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 developed 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

Baryon spectrum fromEBAC & Bonn-Ga (PDG12)

Kamano, Nakamura, Lee et al., 2012

summary and outlook
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!