The Roper Puzzle

Keh Fei Liu; Ying Chen; Ming Gong; Raza Sufian; Mingyang Sun; Anyi Li

The Roper Puzzle

Keh Fei Liu, Ying Chen, Ming Gong, Raza Sufian, Mingyang Sun, Anyi Li

Physics And Astronomy

Research output: Contribution to journal › Conference article › peer-review

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Abstract

We carried out a calculation of the Roper state with the Sequential Empirical Bayesian (SEB) method with overlap valence fermion on 2+1-flavor domain-wall fermion configurations on the 24³×64 lattice with a^-1 = 1:73 GeV. The light sea quark mass corresponds to a pion mass of 330 MeV. The mass of the Roper, chirally extrapolated to the physical pion mass, is 1404(112) MeV which is consistent with the experimental value at 1440 MeV. When compared to the Roper state calculation with variational method for Clover and twisted mass fermions, it is found that the Roper states from SEB with overlap fermion are systematically lower by 400 - 800 MeV for all the quark masses ranging from light to the strange mass region. We study the origin of the difference by exploring the size of the interpolation field in relation to the radial wavefunction of the Roper and also the dynamical influence of the higher Fock space.

Original language	English
Article number	507
Journal	Proceedings of Science
Volume	29-July-2013
State	Published - 2013
Event	31st International Symposium on Lattice Field Theory, LATTICE 2013 - Mainz, Germany Duration: Jul 29 2013 → Aug 3 2013

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title = "The Roper Puzzle",

abstract = "We carried out a calculation of the Roper state with the Sequential Empirical Bayesian (SEB) method with overlap valence fermion on 2+1-flavor domain-wall fermion configurations on the 243×64 lattice with a-1 = 1:73 GeV. The light sea quark mass corresponds to a pion mass of 330 MeV. The mass of the Roper, chirally extrapolated to the physical pion mass, is 1404(112) MeV which is consistent with the experimental value at 1440 MeV. When compared to the Roper state calculation with variational method for Clover and twisted mass fermions, it is found that the Roper states from SEB with overlap fermion are systematically lower by 400 - 800 MeV for all the quark masses ranging from light to the strange mass region. We study the origin of the difference by exploring the size of the interpolation field in relation to the radial wavefunction of the Roper and also the dynamical influence of the higher Fock space.",

author = "Liu, {Keh Fei} and Ying Chen and Ming Gong and Raza Sufian and Mingyang Sun and Anyi Li",

year = "2013",

language = "English",

volume = "29-July-2013",

note = "31st International Symposium on Lattice Field Theory, LATTICE 2013 ; Conference date: 29-07-2013 Through 03-08-2013",

}

TY - JOUR

T1 - The Roper Puzzle

AU - Liu, Keh Fei

AU - Chen, Ying

AU - Gong, Ming

AU - Sufian, Raza

AU - Sun, Mingyang

AU - Li, Anyi

PY - 2013

Y1 - 2013

N2 - We carried out a calculation of the Roper state with the Sequential Empirical Bayesian (SEB) method with overlap valence fermion on 2+1-flavor domain-wall fermion configurations on the 243×64 lattice with a-1 = 1:73 GeV. The light sea quark mass corresponds to a pion mass of 330 MeV. The mass of the Roper, chirally extrapolated to the physical pion mass, is 1404(112) MeV which is consistent with the experimental value at 1440 MeV. When compared to the Roper state calculation with variational method for Clover and twisted mass fermions, it is found that the Roper states from SEB with overlap fermion are systematically lower by 400 - 800 MeV for all the quark masses ranging from light to the strange mass region. We study the origin of the difference by exploring the size of the interpolation field in relation to the radial wavefunction of the Roper and also the dynamical influence of the higher Fock space.

AB - We carried out a calculation of the Roper state with the Sequential Empirical Bayesian (SEB) method with overlap valence fermion on 2+1-flavor domain-wall fermion configurations on the 243×64 lattice with a-1 = 1:73 GeV. The light sea quark mass corresponds to a pion mass of 330 MeV. The mass of the Roper, chirally extrapolated to the physical pion mass, is 1404(112) MeV which is consistent with the experimental value at 1440 MeV. When compared to the Roper state calculation with variational method for Clover and twisted mass fermions, it is found that the Roper states from SEB with overlap fermion are systematically lower by 400 - 800 MeV for all the quark masses ranging from light to the strange mass region. We study the origin of the difference by exploring the size of the interpolation field in relation to the radial wavefunction of the Roper and also the dynamical influence of the higher Fock space.

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M3 - Conference article

AN - SCOPUS:84976322940

VL - 29-July-2013

JO - Proceedings of Science

JF - Proceedings of Science

M1 - 507

T2 - 31st International Symposium on Lattice Field Theory, LATTICE 2013

Y2 - 29 July 2013 through 3 August 2013

ER -

The Roper Puzzle

Abstract

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