Hadronic PhysicsReport from the Town Meeting October 25

Sebastian Kuhn, Old Dominion University

AgendaTown 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

Central Questions in Hadronic Physics

What is the Nature of Confinement?Spectroscopy and form factors of hadronsThe role of gluonic excitationsHadronization

What is the Internal Structure of the Nucleon? (1D → 3D)

How are spin and momentum distributed among partons?Correlations and 3D structureOrbital angular momentum of quarks

How do Nuclear Properties Emerge from Quarks and Gluons?

Are nucleons modified inside the nucleus?

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

Overarching Science Challenges for the coming decade: 2013-2022

C.D. Roberts, Prog. Part. Nucl. Phys. 61 (2008) 50M. Bhagwat & P.C. Tandy, AIP Conf.Proc. 842 (2006) 225-227

*Dynamical Chiral Symmetry Breaking

HadronsMeson Spectroscopy -> AnomaliesSearch for exotic hadrons, e.g. hybrid mesonsPrecision experimental study of valence region, and theoretical computation of distribution functions and distribution amplitudesAccurate 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 correlationsscale at which p-QCD effects become evidentstrangeness contentmeson-cloud effects9 Experiments @12 GeV JLab

Valence GlueNSAC milestone HP15 (2018)

Plot credit: NP2010

Exotics and hybrids are truly novel states

They’re not matter as we know itIn 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!

240 “PAC days” approvedGlueX and Hall B @12 GeV JLab

Excited Glue

Longitudinal

StructureNSAC milestone HP14 (2018)

JLab@12 GeV has unique capability to define the valence region

Helicity conservation

Scalar diquark

SU(6)

+BONuS 12 GeV Projected

9 Experiments @12 GeV JLab+ pp program at RHIC+ FNAL, ….

E.C. Aschenauer

DIS

RHIC200 GeV

RHIC500 GeV

forward h

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…

PhT

SIDIS Drell-Yan

Nucleon Tomography

Quark angular momentum (Ji’s sum rule)

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

( H(x,x,t=0) + E(x,x,t=0) ) x dx = Jquark-1

1=1/2 DS + D Lz

>9 Experiments @12 GeV JLab

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 xB ≥ 1.5

11 JLab 12 GeV experiments, incl. nuclear structure, nucleon modificationsand Color Transparency

J. Seeley et al, PRL 103 (2009)

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

CT, Hadronization and All That

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

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

)()(),,,( 22

DAQpzR h

DIS

hDIS

T

What governs the transition of quarks and gluons into pions and nucleons? NSAC 2007

W. Brooks, K. Hafidi, K. Joo et al.

Production lengthParton energy lossFormation lengthColor transparencyHadron multiplicitypT broadening

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 capabilitiesin existing Halls

Add 5 cryomodules

Add 5 cryomodules

20 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.

Jefferson Lab at 12 GeVHall 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)

12 GeV – Upgrade StatusHall D – equipment installation in progress

Two high-gradient 12 GeV cryomodules installed

and delivering high quality beam; third moved to tunnel

CHL-2 equipment (compressors, coldboxes) in place

Superconducting magnets under constructionAll 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 DipolePrototype Coil

Hall B Pre-ShowerCalorimeter

Central Helium Liquefier-2installation

Third C-100 Cryomoduletransferred to tunnel

Hall D Interior

CLAS12 R2 final DC

Other Physics Topics @ JLab 12 GeV

Testing the Standard ModelParity Violating DIS: SoLID(and a rich program in hadronic Physics)

Parity Violating Möller Scattering

Direct Search for “Dark Photons”APEX, Dark light, HPS

RHIC Spin Program DSSV: arXiv:0904.3821

DSSV+: DSSV+COMPASSDSSV++: DSSV+ & RHIC 2009

DIS

RHIC200 GeV

RHIC500 GeV

forward h

RHIC W±-data will constrain and

Transverse Asymmetries

Other FacilitiesFermilab: Drell-Yan (pol. and unpol.), Neutrinos (Minera), Project X?

HigS (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,…)

Theory

Kamano, Nakamura, Lee et al., 2012

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

Baryon spectrum from EBAC & Bonn-Ga (PDG12)

Lattice-QCDSignificant progress in the last five yearsThis must continue

Bound-state problem in continuum quantum field theory

Significant progress, tooMust 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

Summary and OutlookHadronic 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!