scholarly journals Hadron Spectrum from Lattice QCD

2006 ◽  
Vol 21 (04) ◽  
pp. 726-732
Author(s):  
AKIRA UKAWA
Keyword(s):  
Lattice Qcd ◽  
Recent Work ◽  
Hadron Spectrum ◽  
Strange Quarks ◽  
The Status ◽  
Near Term

A brief review is given of the lattice QCD calculation of the hadron spectrum. The status of current attempts toward inclusion of dynamical up, down and strange quarks is summarized focusing on our own work. Recent work on the possible existence of pentaquark states are assessed. We touch upon the PACS-CS Project for building our next machine for lattice QCD, and conclude with a near-term physics and machine prospects.

Hadron spectrum in lattice QCD

1988 ◽  
Vol 478 ◽  
pp. 501-509
Author(s):  
T. Yoshié
Keyword(s):  
Lattice Qcd ◽  
Hadron Spectrum

scholarly journals Neutron Electric Dipole Moment on the Lattice

2018 ◽  
Vol 175 ◽  
pp. 01014 ◽  
Author(s):  
Boram Yoon ◽  
Tanmoy Bhattacharya ◽  
Rajan Gupta
Keyword(s):  
Dipole Moment ◽  
Cp Violation ◽  
Lattice Qcd ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Beyond The Standard Model ◽  
Matrix Elements ◽  
The Standard Model ◽  
The Status ◽  
Good Probe

For the neutron to have an electric dipole moment (EDM), the theory of nature must have T, or equivalently CP, violation. Neutron EDM is a very good probe of novel CP violation in beyond the standard model physics. To leverage the connection between measured neutron EDM and novel mechanism of CP violation, one requires the calculation of matrix elements for CP violating operators, for which lattice QCD provides a first principle method. In this paper, we review the status of recent lattice QCD calculations of the contributions of the QCD Θ-term, the quark EDM term, and the quark chromo-EDM term to the neutron EDM.

scholarly journals SU(3) Polyakov linear-sigma model: Conductivity and viscous properties of QCD matter in thermal medium

2016 ◽  
Vol 31 (34) ◽  
pp. 1650175 ◽  
Author(s):  
Abdel Nasser Tawfik ◽  
Abdel Magied Diab ◽  
M. T. Hussein
Keyword(s):  
Lattice Qcd ◽  
Mean Field ◽  
Field Approximation ◽  
Linear Sigma Model ◽  
Dense Medium ◽  
Mean Field Approximation ◽  
Chiral Phase ◽  
Strange Quarks ◽  
Transition Formula ◽  
Thermal Medium

In mean field approximation, the grand canonical potential of SU(3) Polyakov linear-[Formula: see text] model (PLSM) is analyzed for chiral phase transition, [Formula: see text] and [Formula: see text] and for deconfinement order-parameters, [Formula: see text] and [Formula: see text] of light- and strange-quarks, respectively. Various PLSM parameters are determined from the assumption of global minimization of the real part of the potential. Then, we have calculated the subtracted condensates [Formula: see text]. All these results are compared with recent lattice QCD simulations. Accordingly, essential PLSM parameters are determined. The modeling of the relaxation time is utilized in estimating the conductivity properties of the QCD matter in thermal medium, namely electric [Formula: see text] and heat [Formula: see text] conductivities. We found that the PLSM results on the electric conductivity and on the specific heat agree well with the available lattice QCD calculations. Also, we have calculated bulk and shear viscosities normalized to the thermal entropy, [Formula: see text] and [Formula: see text], respectively, and compared them with recent lattice QCD. Predictions for [Formula: see text] and [Formula: see text] are introduced. We conclude that our results on various transport properties show some essential ingredients, that these properties likely come up with, in studying QCD matter in thermal and dense medium.

scholarly journals Progress in resolving charge symmetry violation in nucleon structure

2014 ◽  
Vol 23 (07) ◽  
pp. 1461010
Author(s):  
R. D. Young ◽  
P. E. Shanahan ◽  
A. W. Thomas
Keyword(s):  
Lattice Qcd ◽  
Recent Work ◽  
Mass Difference ◽  
Baryon Octet ◽  
Nucleon Structure ◽  
Symmetry Violation ◽  
Charge Symmetry ◽  
Parton Distributions

Recent work unambiguously resolves the level of charge symmetry violation in moments of parton distributions using (2 + 1)-flavor lattice QCD. We introduce the methods used for that analysis by applying them to determine the strong contribution to the proton–neutron mass difference. We also summarize related work which reveals that the fraction of baryon spin which is carried by the quarks is in fact structure-dependent rather than universal across the baryon octet.

The Goniatite Zones of the Namurian

1945 ◽  
Vol 82 (1) ◽  
pp. 1-9 ◽  
Author(s):  
R. G. S. Hudson
Keyword(s):  
Recent Work ◽  
North Africa ◽  
Western Europe ◽  
Novaya Zemlya ◽  
One Stage ◽  
The North ◽  
Faunal Succession ◽  
The Status ◽  
Zones And Subzones

Recent work, both published and unpublished, has considerably increased our knowledge of the goniatite succession in the Namurian of western Europe and the various zones and subzones can now be defined more precisely than hitherto. The major divisions of the Namurian of most value are the former “genus zones” each now raised to the status of an age. Names for these divisions were instituted by Bisat (1928), and were redefined by Hudson and Cotton (1943). The various zones and subzones into which the stages are divided are shown on page 2. The zones differ little from those of previous authors: an attempt has been made to give them equal value and, where possible, the zonal indices in any one stage are of the same genus, thus helping to avoid the confusion caused by the choice as zonal indices of forms of different faunal phase. Neither zonal or subzonal indices are constant in their range in their respective divisions—many of them are confined to a faunal band within the subzone, a few extend into a neighbouring division. The following brief notes are based mainly on the faunal succession of the north of England. The published details of the goniatite faunas in Belgium, Holland, Westphalia, and to a certain extent in Silesia show that the succession there is the same. Comparable forms occur elsewhere as in the Pyrenees, North Africa, Novaya Zemlya, Donetz Basin, Indo-China, Siberia, and U.S.A. The boundaries of the Namurian are those decided on at the Heerlen Congress on Carboniferous Stratigraphy (Jongmans and Gothan, 1937).

scholarly journals Strange quarks in quenched twisted mass lattice QCD

2006 ◽  
Vol 74 (1) ◽  
Author(s):  
Abdou M. Abdel-Rehim ◽  
Randy Lewis ◽  
R. M. Woloshyn ◽  
Jackson M. S. Wu
Keyword(s):  
Lattice Qcd ◽  
Strange Quarks ◽  
Twisted Mass

scholarly journals Light hadron spectrum and quark masses from quenched lattice QCD

2003 ◽  
Vol 67 (3) ◽  
Author(s):  
S. Aoki ◽  
G. Boyd ◽  
R. Burkhalter ◽  
S. Ejiri ◽  
M. Fukugita ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Hadron Spectrum ◽  
Quark Masses ◽  
Light Hadron
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