12 gev science program r. d. mckeown jsa science council january 7, 2011 thanks to a. lung, l....
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12 GeV Science Program
R. D. McKeown
JSA Science Council January 7, 2011
Thanks to A. Lung, L. Cardman, others
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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: – Five Reviews: Program Advisory Committees (PAC) 30, 32, 34, 35, 36
– 2006 through 2010
– Results: 37 experiments approved ; 12 conditionally approved
– PAC37 scheduled January 2011: 9 new proposals, continue rankings
Exciting slate of experiments for 4 Halls planned for initial five years of operation!
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12 GeV Upgrade Project
Upgrade 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
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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
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Quantum Numbers of Hybrid MesonsQuarks
Excited Flux Tube Hybrid Meson
S 0
L 0
J PC 0
J PC 1
1
J PC
1
1
, Klike
J PC 0 1 2
0 1 2
S 1
L 0
J PC 1
J PC 1
1
like ,
Exotic
Flux tube excitation (and parallel quark spins) lead to exotic JPC
5R. McKeown – Hadron Workhop - Beijing
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Proton Spin Puzzle
6R. McKeown – Hadron Workhop - Beijing
• DIS → DS 0.25
• RHIC + DIS → Dg« 1
• → Lq
D. de Florian et al., PRL 101 (2008) 072001
[X. Ji, 1997]
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Wpu(x,k
T,r ) Wigner distributions
d2kT
PDFs f1
u(x), .. h1u(x)
GPDs/IPDs
d2kT drzd3r
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
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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(Møller, PVDIS, PRIMEX, …..)
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12 GeV Approved Experiments by Physics Topics
Topic Hall A Hall B Hall C Hall D Total
The Hadron spectra as probes of QCD (rated) (GluEx and heavy baryon and meson spectroscopy) 1 1
The transverse struture of the hadrons (rated) (Elastic and transition Form Factors) 4 2 2 8
The longitudinal structure of the hadrons (rated) (Unpolarized and polarized parton distribution functions) 1 2 4 7
The 3D structure of the hadrons (unrated) (Generalized Parton Distributions and Transverse Momentum Distributions) 2 7 2 11
Hadrons and cold nuclear matter (rated) (Medium modification of the nucleons, quark hadronization, N-N correlations, hypernuclear spectroscopy, few-body experiments) 1 2 4 7
Low-energy tests of the Standard Model and Fundamental Symmetries (to be rated at PAC 37) 2 1 3
TOTAL 10 13 12 2 37
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12 GeV Approved Experiments by PAC Days
Topic Hall A Hall B Hall C Hall D Total
The Hadron spectra as probes of QCD (rated) (GluEx and heavy baryon and meson spectroscopy) 120 120
The transverse structure of the hadrons (rated) (Elastic and transition Form Factors) 144 70 118 332
The longitudinal structure of the hadrons (rated) (Unpolarized and polarized parton distribution functions) 23 120 118 261
The 3D structure of the hadrons (unrated) (Generalized Parton Distributions and Transverse Momentum Distributions) (190) (801) (80) 1071
Hadrons and cold nuclear matter (rated) (Medium modification of the nucleons, quark hadronization, N-N correlations, hypernuclear spectroscopy, few-body experiments) 5 100 102 207
Low-energy tests of the Standard Model and Fundamental Symmetries (to be rated at PAC 37) (592) (88) 680
TOTAL 954 1091 418 208 2671
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Super Bigbite Spectrometer (SBS) in Hall A
Scattering chamber
Vacuum snout
Magnetic shield
First tracker
Second tracker Hadron calorimeter
Beam line Pb shield
48D48 magnet
Third tracker
CH2 analyzer
Beam
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MIE Funding schedule under discussion with DOE
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SBS: Extension GEn to High Q2
• The dramatic turnover of the Argonne DSE model would be clearly visible. • If the turnover is seen, it would provide strong evidence for the importance of diquark
degrees of freedom in the nucleon form factors.12
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Møller & Deep Inelastic Scattering Parity Violation
• SoLID: general purpose deep inelastic parity violating experiment with solenoid
• Chinese contribution
• Dedicated Møller Experiment
(successor to SLAC E158)• DOE MIE proposal → CD0
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Future PV Program
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PAMELA Data on Cosmic Radiation
Va. Tech. Physics Colloquium, Dec. 3, 2010
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Surprising rise in e+ fraction
But not p
• Could indicate low mass A’ (MA’ < 1 GeV )
• Or local astrophysical origin??
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New Opportunity: Search for A’ at JLab
Search for new forces mediated by ~100 MeV vector boson A’
with weak coupling to electrons:
Irrespective of astrophysical anomalies: • New ~GeV–scale force carriers are important category of physics beyond the SM• Fixed-target experiments @JLab (FEL + CEBAF) have unique capability to explore this!
g – 2 preferred!
16Va. Tech. Physics Colloquium, Dec. 3, 2010
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A Short “White Paper”
→ NP2010 panel→ IHEP, potential new collaborators
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12 GeV Upgrade Schedule
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• Major Procurements (> $500K) nearly complete:– cryomodule cavities– beam transport magnets– cryogenics coldbox– vacuum valves– cold tuner– etc. etc. etc.
ACCELERATOR CONSTRUCTION
Beam Transport Quadrupole Magnets
(114 - total order - on site)
Cryomodule Cavities (12 of 80 ordered on site)
4-meter Dipole Magnets(23 of 37 ordered on site)
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12 GeV Upgrade – Cryomodule Cavity String
January 4, 2011
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Physics Equipment Construction
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Physics Equipment Construction
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Hall D Status – Dec. 2010
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Ready For Equipment (RFE)Dec. 28, 2010
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12 GeV Outlook
• Physics program is taking shape• “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
- SOLID
- MOLLER