Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.141802
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Funding
- Forschungszentrum Julich GmbH, Department of Energy, Office of Nuclear Physics [DE-AC02-06CH11357]
- National Science Foundation [NSF-PHY1206187]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1206187] Funding Source: National Science Foundation
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A novel method is employed to compute the pion electromagnetic form factor, F-pi(Q(2)), on the entire domain of spacelike momentum transfer using the Dyson-Schwinger equation (DSE) framework in QCD. The DSE architecture unifies this prediction with that of the pion's valence-quark parton distribution amplitude (PDA). Using this PDA, the leading-order, leading-twist perturbative QCD result for Q(2)F(pi)(Q(2)) underestimates the full computation by just 15% on Q(2) greater than or similar to 8 GeV2, in stark contrast to the result obtained using the asymptotic PDA. The analysis shows that hard contributions to the pion form factor dominate for Q(2) greater than or similar to 8 GeV2, but, even so, the magnitude of Q(2)F(pi)(Q(2)) reflects the scale of dynamical chiral symmetry breaking, a pivotal emergent phenomenon in the standard model.
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