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 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 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 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 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

scholarly journals Predicting positive parity Bs mesons from lattice QCD

2015 ◽  
Vol 750 ◽  
pp. 17-21 ◽  
Author(s):  
C.B. Lang ◽  
Daniel Mohler ◽  
Sasa Prelovsek ◽  
R.M. Woloshyn
Keyword(s):  
Lattice Qcd ◽  
Positive Parity

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.

scholarly journals Positive parity excited states of the nucleon

2010 ◽  
Author(s):  
S. Mahbub ◽  
Alan O Cais ◽  
Waseem Kamleh ◽  
B. G. Lasscock ◽  
Derek Leinweber ◽  
...  
Keyword(s):  
Excited States ◽  
Positive Parity

scholarly journals Analogues of Excited States in 91Zr

1969 ◽  
Vol 22 (4) ◽  
pp. 541 ◽  
Author(s):  
GA Jones ◽  
GC Morrison ◽  
RB Taylor
Keyword(s):  
Excitation Energy ◽  
Excited States ◽  
Single Particle ◽  
Ground State ◽  
Level Structure ◽  
Positive Parity

The level structure in 91Zr has been investigated by Cohen and Chubinsky (1963) with the 90Zr (d, p)91Zr reaction. They noted some 14 levels up to an excitation energy of 3�9 MeV. All these states were found to have positive parity and their structure is fairly well understood in terms of coupling a single-particle neutron to the ground state and the first two excited states of 90Zr (Ramavataram 1964). A study of the isobaric analogues of the 9lZr states with the 90Zr(p, pO)90Zr reaction was carried out by Moore (1964).

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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