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https://hdl.handle.net/2440/80052
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dc.contributor.author | Roberts, D. | - |
dc.contributor.author | Kamleh, W. | - |
dc.contributor.author | Leinweber, D. | - |
dc.date.issued | 2013 | - |
dc.identifier.citation | Physics Letters B: Nuclear Physics and Particle Physics, 2013; 725(1):164-169 | - |
dc.identifier.issn | 0370-2693 | - |
dc.identifier.uri | http://hdl.handle.net/2440/80052 | - |
dc.description.abstract | We apply the eigenvectors from a variational analysis in lattice QCD to successfully extract the wave function of the Roper state, and a higher mass P11 state of the nucleon. We use the 2+1 flavour 323×64 PACS-CS configurations at a near-physical pion mass of 156 MeV. We find that both states exhibit a structure consistent with a constituent quark model. The Roper d-quark wave function contains a single node consistent with a 2S state, and the third state wave function contains two, consistent with a 3S state. A detailed comparison with constituent quark model wave functions is carried out, obtained from a Coulomb plus ramp potential. These results validate the approach of accessing these states by constructing a variational basis composed of different levels of fermion source and sink smearing. Furthermore, significant finite volume effects are apparent for these excited states which mix with multi-particle states, driving their masses away from physical values and enabling the extraction of resonance parameters from lattice QCD simulations. © 2013 . | - |
dc.description.statementofresponsibility | Dale S. Roberts, Waseem Kamleh, Derek B. Leinweber | - |
dc.language.iso | en | - |
dc.publisher | Elsevier Science BV | - |
dc.rights | © 2013 Published by Elsevier B.V. | - |
dc.source.uri | http://dx.doi.org/10.1016/j.physletb.2013.06.056 | - |
dc.subject | Roper resonance | - |
dc.subject | Wave functions | - |
dc.subject | Lattice QCD | - |
dc.title | Wave function of the Roper from lattice QCD | - |
dc.type | Journal article | - |
dc.contributor.organisation | Special Research Centre for the Subatomic Structure of Matter | - |
dc.identifier.doi | 10.1016/j.physletb.2013.06.056 | - |
dc.relation.grant | ARC | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Kamleh, W. [0000-0002-6177-5366] | - |
dc.identifier.orcid | Leinweber, D. [0000-0002-4745-6027] | - |
Appears in Collections: | Aurora harvest 4 Special Research Centre for the Subatomic Structure of Matter publications |
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