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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




JLab@12 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)

  • Flavor, isospin and spin dependence of EMC effect? JLab@12, Drell-Yan, MINERvA

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!