scholarly journals Extracting excited states from lattice QCD: the Roper resonance

2004 ◽  
Vol 604 (1-2) ◽  
pp. 74-81 ◽  
Author(s):  
D. Guadagnoli ◽  
M. Papinutto ◽  
S. Simula
Keyword(s):  
Lattice Qcd ◽  
Excited States ◽  
Roper Resonance

scholarly journals Extracting excited states from lattice QCD: the Roper resonance

2005 ◽  
Vol 755 ◽  
pp. 485-488 ◽  
Author(s):  
D. Guadagnoli ◽  
M. Papinutto ◽  
S. Simula
Keyword(s):  
Lattice Qcd ◽  
Excited States ◽  
Roper Resonance

scholarly journals Novel analysis method for excited states in lattice QCD: The nucleon case

2015 ◽  
Vol 91 (1) ◽  
Author(s):  
C. Alexandrou ◽  
T. Leontiou ◽  
C. N. Papanicolas ◽  
E. Stiliaris
Keyword(s):  
Lattice Qcd ◽  
Excited States ◽  
Analysis Method

scholarly journals Positive-parity excited states of the nucleon in quenched lattice QCD

2010 ◽  
Vol 82 (9) ◽  
Author(s):  
M. S. Mahbub ◽  
Alan Ó. Cais ◽  
Waseem Kamleh ◽  
Derek B. Leinweber ◽  
Anthony G. Williams
Keyword(s):  
Lattice Qcd ◽  
Excited States ◽  
Positive Parity

scholarly journals Nπ scattering in the Roper channel

2018 ◽  
Vol 175 ◽  
pp. 05004
Author(s):  
M. Padmanath ◽  
C. B. Lang ◽  
Luka Leskovec ◽  
Sasa Prelovsek
Keyword(s):  
Lattice Qcd ◽  
Positive Parity ◽  
Roper Resonance ◽  
S Wave ◽  
Lattice Spectrum ◽  
Lattice Calculations ◽  
Channel Effects ◽  
Technical Details ◽  
Elastic Approximation ◽  
Coupled Channel

We present results from our recent lattice QCD study of Nπ scattering in the positive-parity nucleon channel, where the puzzling Roper resonance N*(1440) resides in experiment. Using a variety of hadron operators, that include qqq-like, Nπ in p-wave and Nσ in s-wave, we systematically extract the excited lattice spectrum in the nucleon channel up to 1.65 GeV. Our lattice results indicate that Nπ scattering in the elastic approximation alone does not describe a low-lying Roper. Coupled channel effects between Nπ and Nππ seem to be crucial to render a low-lying Roper in experiment, reinforcing the notion that this state could be a dynamically generated resonance. After giving a brief motivation for studying the Roper channel and the relevant technical details to this study, we will discuss the results and the conclusions based on our lattice investigation and in comparison with other lattice calculations.

scholarly journals Maximum entropy analysis of hadron spectral functions and excited states in quenched lattice QCD

2002 ◽  
Vol 106-107 ◽  
pp. 233-235
Author(s):  
S. Aoki ◽  
R. Burkhalter ◽  
M. Fukugita ◽  
S. Hashimoto ◽  
N. Ishizuka ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Maximum Entropy ◽  
Excited States ◽  
Entropy Analysis ◽  
Spectral Functions

SPECTROSCOPY OF LIGHT HADRONS ON ANISOTROPIC LATTICES

2006 ◽  
Vol 21 (26) ◽  
pp. 5253-5274
Author(s):  
FRANK X. LEE
Keyword(s):  
Mass Spectrum ◽  
Lattice Qcd ◽  
Excited States ◽  
Ground State ◽  
Quark Mass ◽  
Tree Level ◽  
Mass Dependence ◽  
Anisotropic Lattices ◽  
Quark Mass Dependence ◽  
The Masses

The mass spectrum of spin-1/2 baryons in both parity channels is computed using the methods of lattice QCD in the quenched approximation. An anisotropic action with anisotropy as/at = 3 is employed, using tree-level coefficients with tadpole improvement. Clear splittings from the nucleon ground state are observed with smeared operators and 500 configurations. Methods for extracting the first excited states are investigated. Using the quark mass dependence of the masses, qualitative comparisons are made with previous calculations and experiment.

COULOMB WAVE FUNCTIONS OF NUCLEON AND ROPER ON THE LATTICE

2007 ◽  
Vol 22 (07n10) ◽  
pp. 583-589 ◽  
Author(s):  
YING CHEN
Keyword(s):  
Wave Function ◽  
Lattice Qcd ◽  
Coulomb Gauge ◽  
Wave Functions ◽  
Roper Resonance ◽  
Typical Size ◽  
Quark Masses ◽  
Spatially Extended

By applying a spatially extended sink operator, the nucleon two-point functions are calculated in Coulomb gauge from quenched lattice QCD with overlap fermions. The Bethe-Salpeter wave functions of nucleon and Roper resonance are extracted at different quark masses. The typical size of nucleon is about 0.7 fm, which seems insensitive to the quark masses involved in this work. It is also found that the wave function of Roper has a radial node.

scholarly journals Exploring excited states of the nucleon in 2+1 flavor lattice QCD

2012 ◽  
Author(s):  
M. S. Mahbub ◽  
W. Kamleh ◽  
D. B. Leinweber ◽  
P. J. Moran ◽  
A. G. Williams
Keyword(s):  
Lattice Qcd ◽  
Excited States

scholarly journals Isolating excited states of the nucleon in lattice QCD

2009 ◽  
Vol 80 (5) ◽  
Author(s):  
M. S. Mahbub ◽  
Alan Ó. Cais ◽  
Waseem Kamleh ◽  
B. G. Lasscock ◽  
Derek B. Leinweber ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Excited States
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