UK Hadron Physics
D. G. Ireland
10 October 2014 NuPECC Meeting, Edinburgh
2
Nuclear Physics Landscape
3
Key Physics Questions
Generation of MassConfinement
Nucleon Spin
4
Which facilities are used?
GlasgowEdinburgh
MAX-Lab, Lund
Mainz
Jefferson Lab
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Jefferson Lab (and 12 GeV Upgrade)
8 January 2014
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
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
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JLab - Hall A
High Resolution Spectrometers,plus BigBite
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JLab - Hall A Upgrade
High Resolution Spectrometers,plus BigBite
plus Super Bigbite Spectrometer (SBS)
JLab – Hall B
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JLab – Hall B Upgrade
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CLAS12
Forward Tagger
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The MAMI Facility
• 100% duty factor electron microtron
• MAMI-C 1.5 GeV upgrade
(MAMI-B 0.85 GeV)
One of the MAMI-C magnets
e
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Crystal Ball at MAMI
g
DE g ~ 2 MeV108 g sec-1
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Nucleon Structure
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Reactions
Elastic Scattering
Semi-Inclusive Deep Inelastic Scattering (SIDIS)
Deeply Virtual ComptonScattering (DVCS)
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Nucleon Form Factors
Q2=q2-n2
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Quark Distributions
JLab Upgrade 15
Projected SBS/BB data 11 GeV 8.8 GeV 6.6 GeV
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Baryon Resonances
Quark Model N* Resonances
Lattice QCD
Quark Model D* Resonances
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CLAS results γp→K+Λ → K+pπ-
Bonn-Gatchina Coupled Channel Analysis, A.V. Anisovich et al, EPJ A48, 15 (2012)
(Includes nearly all new photoproduction data)
M. Mc Cracken et al. (CLAS), Phys. Rev. C 81, 025201, 2010 R. Bradford et al. (CLAS), Phys.Rev. C75, 035205, 2007
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Evidence for new N* states and couplings
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Coherent Pion Photoproduction
Angular distribution of p0 → PWIA contains the matter form factor
p0 final state interactions - use latest complex optical potentials tuned to p-A scattering data. Corrections modest at low pion momenta
Photon probe Interaction well understood p0 meson – produced with
~equal probability on protons AND neutrons.
Reconstruct p0
from p0→2 g decay
ds/d (W PWIA) = (s/mN2) A2 (qp*/2kg) F2(Eg
*,qp*)2 |F
m(q)|2 sin2qp
*
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208Pb neutron skin
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Comparison with previous measurements
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.50
2
4
6
8
10
12
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Pion scattering
PREX
Drnp
Proton scattering
Antiprotonic atomsHeavy ion diffusionElectric dipolePygmy dipole
}Coherent pion
DropletNstar + QMC
Latimer
Tsang
Analyses using theory, expt, observation.
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Future directions
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Structure Functions
k y
kx
-0.5
0.5
0.0
-0.5 0.0 0.5
bx [fm] Anselmino et al., 2009QCDSF/UKQCD
Coll., 2006
2+1 D picture in momentum space2+1 D picture in impact-parameter space
TMDsGPDs
• Accessed through Semi-Inclusive DIS
• OAM through spin-orbit correlations?
• Accessed through exclusive processes
• Ji sum rule for nucleon spinF
1T┴(x
) [
Siv
ers
fun
ctio
n]
quark density
Lattice QCD
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Future directions… Hadron Spectroscopy
• Exotic mesons
• Very strange baryons
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The Search for “Dark Photons”
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Sea quarks and the glue that binds us all
Proton parton density functions
(PDFs)
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Electron-Ion Collider Designs
Stage I Stage II eRHIC @ BNL
MEIC / EIC @ JLab √s = 13 – 70 GeV
Ee = 3 – 12 GeV
Ep = 15 – 100 GeV
EPb
= up to 40 GeV/A
√s = 34 – 71 GeV
Ee = 3 – 5 (10 ?) GeV
Ep = 100 – 255 GeV
EPb
= up to 100 GeV/A
√s = up to ~180 GeV
Ee = up to ~30 GeV
Ep = up to 275 GeV
EPb
= up to 110 GeV/A
√s = up to ~140 GeV
Ee = up to 20 GeV
Ep = up to at least 250 GeV
EPb
= up to at least 100 GeV/A
(EIC)(MEIC)
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Summary
GlasgowEdinburgh
MAX-Lab, Lund
Mainz
Jefferson Lab
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