Low-lying odd-parity nucleon resonances as quark-model-like states
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(Published version)
Date
2023
Authors
Abell, C.D.
Leinweber, D.B.
Liu, Z.-W.
Thomas, A.W.
Wu, J.-J.
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Journal article
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Physical Review D, 2023; 108(9):094519-1-094519-18
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Curtis D. Abell, Derek B. Leinweber, Zhan-Wei Liu, Anthony W. Thomas, and Jia-Jun Wu
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Abstract
Recent lattice QCD results for the low-lying odd-parity excitations of the nucleon near the 𝑁*(1535) and 𝑁*(1650) resonance positions have revealed that the lattice QCD states have magnetic moments consistent with predictions from a constituent quark model. Using Hamiltonian effective field theory (HEFT) to describe pion-nucleon scattering in the I(JP) = ½ (½⁻) channel, we represent these two quark-model-like states as two single-particle bare basis states, dressed and mixed by meson-baryon scattering channels. By constraining the free parameters of the Hamiltonian with 𝑆₁₁ pion-nucleon scattering data, we perform the first calculation of the finite-volume spectrum using two bare-baryon basis states. By comparing this spectrum to contemporary lattice QCD results at three lattice volumes, we analyze the eigenvectors of the Hamiltonian to gain insight into the structure and composition of these two low-lying resonances. We find that an interpretation of the two low-lying nucleon resonances as quark-model-like states dressed by meson-baryon interactions is consistent with both the 𝑆11 scattering data and lattice QCD. We introduce a novel HEFT formalism for estimating scattering-state contaminations in lattice QCD correlation functions constructed with standard three-quark operators. Not only are historical lattice QCD results described with excellent accuracy, but correlation functions with large scattering-state contaminations are identified.
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Published 30 November 2023)\
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.