Cold Nuclear Physics

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


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


Relevant NSAC MilestonesStatus as of 2008/2009

(2008)


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)


http://arXiv.org/abs/arXiv:1302.2233

http://arXiv.org/abs/arXiv:1302.2233

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.


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


Present CNP Program

Topological Charge Density

Anisotropic clover Isotropic cloverIsotropic clover,domain-wall,overlap,Staggered


Future CNP ProgramPhysical Pion Mass

Topological Charge Density

Isotropic clover : Domain-wallOverlap small enough lattice spacings

multi-neutron forces


USQCD Proposed Production2014-2019


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



The End, or is it the Beginning

, Wilso

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Cold Nuclear Physics

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