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Lattice QCD Oak Ridge National Laboratory
April 29, 2013Cold Nuclear Physics
Structure, Spectrum and Interactions of Hadrons
Monday, April 29, 2013
Science Challenge
Nuclear Structure Many-Body Methods
Hyperons
Solve QCD
Spectrum and Structure of the Nucleon
Interactions of the Nucleon and Hyperons
Monday, April 29, 2013
USQCD Program in
Structure, Spectrum and Interactions of Hadrons
• Closely aligned with major NP projects• JLab (12 GeV upgrade) - Spectrum and Structure
• FRIB - Interactions• ORNL, LANL - Fundamental Symmetries• Nuclei - nuclear many-body collaboration
• Closely tied to NSAC Milestones• HP 3, 9,10, 15 • FI 15
• Current : ~5 Pflop-yrs integrated resources 2013-2018
Monday, April 29, 2013
Relevant NSAC MilestonesStatus as of 2008/2009
(2008)
Monday, April 29, 2013
Structure
• gA and other q2=0 matrix elements• <xn> • charge and magnetic radii, FF’s, etc
0.10 0.15 0.20 0.25mπ [GeV]
0.00
0.05
0.10
0.15
0.20
0.25
�x� u
−d
BChPT32c48 coarse48c48 coarseCTEQ6
QCDSF : Horsley et al, arXiv:1302.2233 [hep-lat]
Precision is needed(complete uncertainty quantification)
Monday, April 29, 2013
Spectrum
• Spectrum of mesons and baryons • exotics, molecules• coupled channels, etc
Lattice QCD needs to predict the exotic spectrum before or during the GlueX experiment
δ(ππ )Dudek et al.
Monday, April 29, 2013
Hadronic Interactions
mπ ~ 800 MeV
0 100 200 300 400 500 600 700 8000
20
40
60
80
100
120
140
mΠ �MeV�
4 He:B�MeV
� nf�2�1 �NPLQCD�nf�0 �Yamazaki et al�nf�2�1 �Yamazaki et al�
Deuteron appears to be unnatural for a large range quark masses
Nuclei Scatteringmπ ~ 800 MeV
Monday, April 29, 2013
Present CNP Program
Topological Charge Density
Anisotropic clover Isotropic cloverIsotropic clover,domain-wall,overlap,Staggered
Monday, April 29, 2013
Future CNP ProgramPhysical Pion Mass
Topological Charge Density
Isotropic clover : Domain-wallOverlap small enough lattice spacings
multi-neutron forces
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USQCD Proposed Production2014-2019
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Compute Resources for Viability
• Keeps the US competitive in many areas (with risk)• Somewhat behind the experimental time table• Maintain fraction of Leadership-Class resources (~15%)
2012!
2018!
e.g.Hadronic Spectrosopy
Moore’s LawMoore’s Law +
possible Algorithm DevelopmentMonday, April 29, 2013
Cold Nuclear PhysicsSummary
• Transformational period for Cold Nuclear Physics• ORNL could play a major role in that transformation
• Well-defined plan for successful program in CNP• spectrum, structure and interactions• coherent program
• Nuclear Physics at the physical pion mass• fully quantified uncertainties• direct input into existing nuclear efforts• both theory and experiment
Monday, April 29, 2013
Monday, April 29, 2013
The End, or is it the Beginning
, Wilso
n
Monday, April 29, 2013
Monday, April 29, 2013
