r. d. mckeown jefferson lab college of william and mary

Thomas Jefferson National Accelerator Facility R. D. McKeown Slide 1

R. D. McKeownJefferson Lab

College of William and Mary

The 12 GeV Science Programat Jefferson Lab

Hadron Physics WorkshopWeihai, ChinaAugust 8, 2011


Outline

• CEBAF 12 GeV Upgrade Project - Capabilities- Status

• 12 GeV Research Program

• Beyond 12 GeV - Electron Ion Collider


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

New Hall

Add arc

Enhanced capabilitiesin existing Halls

Add 5 cryomodules

Add 5 cryomodules

20 cryomodules

20 cryomodules

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….

Upgrade arc magnets and supplies

CHL upgrade


Hall D – exploring origin of confinement by studying exotic mesons

Hall B – understanding nucleon structure via generalized parton distributions

Hall C – precision determination of valence quark properties in nucleons and nuclei

Hall A – short range correlations, form factors, hyper-nuclear physics, future new experiments (e.g., PV and MOLLER)

12 GeV Scientific Capabilities


12 GeV Upgrade ScheduleTwo short parasitic installation periods in FY10

6-month installation May – Oct 2011

12-month installation May 2012 – May 2013

Hall A commissioning start October 2013

Hall D commissioning start April 2014

Halls B/C commissioning start October 2014

Project Completion June 2015


Hall D Status – July 2011

Ready For Equipment (RFE) Dec. 28, 2010


Arc Dipole Installation


12 GeV Science Program

• The physical origins of quark confinement (GlueX, meson and baryon spectroscopy)

• The spin and flavor structure of the proton and neutron (PDF’s, GPD’s, TMD’s…)

• The quark structure of nuclei

• Probe potential new physics through high precision tests of the Standard Model

• Defining the Science Program:

– Six Reviews: Program Advisory Committees (PAC) 30, 32, 34, 35, 36, 37

– 2006 through 2011

– Results: 45 experiments approved; 14 conditionally approved

– PAC38 scheduled August 2011: consider new proposals, continue rankings

Exciting slate of experiments for 4 Halls planned for initial five years of operation!


PAC 12 GeV Science Categories• The Hadron spectra as probes of QCD

(GlueX and heavy baryon and meson spectroscopy)

• The transverse structure of the hadrons (Elastic and transition Form Factors)

• The longitudinal structure of the hadrons (Unpolarized and polarized parton distribution functions)

• The 3D structure of the hadrons(Generalized Parton Distributions and Transverse Momentum Distributions)

• Hadrons and cold nuclear matter(Medium modification of the nucleons, quark hadronization, N-N correlations, hypernuclear spectroscopy, few-body experiments)

• Low-energy tests of the Standard Model and Fundamental Symmetries(MOLLER, PVDIS, PRIMEX, …..)


Topic Hall A Hall B Hall C Hall D TotalThe Hadron spectra as probes of QCD (rated) (GluEx and heavy baryon and meson spectroscopy) 1 1 2 The transverse structure of the hadrons (rated) (Elastic and transition Form Factors) 4 2 3 9

The longitudinal structure of the hadrons (rated) (Unpolarized and polarized parton distribution functions) 2 2 4 8

The 3D structure of the hadrons (unrated) (Generalized Parton Distributions and Transverse Momentum Distributions) 3 8 4 15

Hadrons and cold nuclear matter (rated) (Medium modification of the nucleons, quark hadronization, N-N correlations, hypernuclear spectroscopy, few-body experiments) 1 2 5 8Low-energy tests of the Standard Model and Fundamental Symmetries (rated at PAC 37) 2 1 3

TOTAL 12 15 16 2 45

12 GeV Approved Experiments by Physics Topics

More than 5 years running time


Hall D

11


Quantum Numbers of Hybrid MesonsQuarks Excited

Flux Tube Hybrid Meson

S 0L 0

J PC 0

J PC 1

1

J PC

1

1

, Klike

J PC 0 1 2

0 1 2

S 1L 0

J PC 1

J PC 1

1

like ,

Exotic

Flux tube excitation (and parallel quark spins) lead to exotic JPC


States with Exotic Quantum Numbers

Isovector Meson Spectrum

1 -+

0+-2+-

Hall D@JLab

Dudek et al.


Proton Spin Puzzle

• DIS → DS0.25

• RHIC + DIS → Dg« 1

• → Lq

D. de Florian et al., PRL 101 (2008) 072001

[X. Ji, 1997]


Wpu(x,kT,r ) Wigner distributions

d2kT

PDFs f1

u(x), .. h1u(x)

d3r

TMD PDFs f1

u(x,kT), .. h1u(x,kT)

3D imaging

6D Dist.

Form FactorsGE(Q2), GM(Q2)

d2rT

dx &Fourier Transformation

1D

Unified View of Nucleon Structure

GPDs/IPDs

d2kT drz


Extraction of GPD’s

t

hard vertices

A = Ds2s

ss

ss =

Unpolarized beam, transverse target:

DsUT~ sinf{k(F2H – F1E)}df E(x,t)

DsLU~ sinf{F1H+ ξ(F1+F2)H+kF2E}df~

Polarized beam, unpolarized target:

H(x,t)

ξ=xB/(2-xB)

Unpolarized beam, longitudinal target:

DsUL~ sinf{F1H+ξ(F1+F2)(H+ξ/(1+ξ)E)}df~ H(x,t)~

Cleanest process: Deeply Virtual Compton Scattering


Quark Angular Momentum

→ Access to quark orbital angularmomentum


DVCS beam asymmetry at 12 GeV CLAS12

ep ep

High luminosity and large acceptance allows wide coverage in Q2 < 8 GeV2, xB< 0.65, andt< 1.5GeV2

Experimental DVCS program E12-06-119 was approved for the 12 GeV upgrade using polarized beam and polarized targets.

sinφ moment of ALU


High x spin dependent DIS

REQUIRES:• High beam polarization• High electron current• High target polarization• Large solid angle spectrometers


SIDIS Electroproduction of Pions

• Separate Sivers and Collins effects

• Sivers angle, effect in distribution function:– (fh-fs) = angle of hadron relative to initial quark spin

• Collins angle, effect in fragmentation function: – (fh+fs) = +(fh-fs’) = angle of hadron relative to final quark spin

e-e’ planeq

Scattering Plane

target angle

hadron angle


A Solenoid Spectrometer for SIDIS

SIDIS SSAs depend on 4 variables (x, Q2, z and PT ) Large angular coverage and precision measurement of asymmetries in 4-D phase space are essential.


SoLID Transversity Projected Data• Total 1400 bins in x, Q2, PT and z for 11/8.8 GeV beam.• z ranges from 0.3 ~ 0.7, only one z and Q2 bin of 11/8.8 GeV is shown here. π+

projections are shown, similar to the π- .


Super Bigbite Spectrometer (SBS) in Hall A

48D48 magnet

Beam

• General purpose device• Well-suited to form factor expts• ~$5M total, construction: 2013-5•Review proposed for fall 2011


MOLLER & Deep Inelastic Scattering Parity Violationin Hall A

• SoLID (solenoidal large intensity device): general purpose deep inelastic parity violating experiment with solenoid

• Chinese contribution

• Dedicated MOLLER Experiment (successor to SLAC E158)

• DOE MIE proposal → CD-0


Future PV Program


New Opportunity: Search for A’ at JLabSearch for new forces mediated

by ~100 MeV vector boson A’ with weak coupling to electrons:

• New ~GeV–scale force carriers are important category of physics beyond the SM.• A’ could couple to dark matter and explain some anomalous astrophysical data.• Fixed-target experiments @JLab (FEL + CEBAF) have unique capability to explore this!

26Va. Tech. Physics Colloquium, Dec. 3, 2010

g – 2 preferred!


Into the “sea”: EIC

12 GeV

• With 12 GeV we study mostly the valence quark component

•An EIC aims to study the sea quarks, gluons, and scale (Q2) dependence.

mEIC

EIC


Medium Energy EIC@JLab

Three compact rings:• 3 to 11 GeV electron• Up to 12 GeV/c proton (warm)• Up to 60 GeV/c proton (cold)


EIC Realization Imagined Activity Name 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025

12 Gev Upgrade

FRIB

EIC Physics Case

NSAC LRP

EIC CD0

EIC Machine Design/R&D

EIC CD1/Downsel

EIC CD2/CD3

EIC Construction


Outlook • 12 GeV Physics program is well developed and expanded

• “Beyond Standard Model” program is growing– Parity violation– New gauge boson searches

• Construction Project is on track

• New equipment requirements (Hall A)– Super Bigbite Spectrometer (SBS)– MOLLER– SoLID

• Beyond 12 GeV EIC…

r. d. mckeown jefferson lab college of william and mary

Documents

mckeown slide

existing facility

d structure

gev upgrade projectupgrade

hall d commissioning

gev research program

hall d status

transverse structure