scholarly journals Nucleon spin and quark content at the physical point

2017 ◽  
Author(s):  
Constantia Alexandrou ◽  
Martha Constantinou ◽  
Kyriakos Hadjiyiannakou ◽  
Christos Kallidonis ◽  
Giannis Koutsou ◽  
...  
Keyword(s):  
Nucleon Spin ◽  
Physical Point ◽  
Quark Content

scholarly journals AXIAL ANOMALY AND THE NUCLEON SPIN

1996 ◽  
Vol 11 (11) ◽  
pp. 931-938
Author(s):  
JIN HU LIN ◽  
C.S. KIM
Keyword(s):  
Higher Order ◽  
Nucleon Spin ◽  
Axial Anomaly ◽  
Large N ◽  
The Difference ◽  
Quark Content

In this letter we have taken a particular Lagrangian, which was introduced to resolve U(1) problem, as an effective QCD Lagrangian, and have derived a formula of the quark content of the nucleon spin. The difference between quark content of the proton (ΔΣp) and that of the neutron (∆Σn) is evaluated by this formula. Neglecting the higher-order isospin corrections, this formula can reduce to Efremov’s results in the large-Nc limit.

scholarly journals A lattice study of the nucleon quark content at the physical point

2016 ◽  
Author(s):  
Christian Torrero ◽  
Stephan Durr ◽  
Zoltan Fodor ◽  
Christian Hoelbling ◽  
Sandor D. Katz ◽  
...  
Keyword(s):  
Physical Point ◽  
Quark Content

scholarly journals Direct Evaluation of the Quark Content of Nucleons from Lattice QCD at the Physical Point

2016 ◽  
Vol 116 (25) ◽  
Author(s):  
A. Abdel-Rehim ◽  
C. Alexandrou ◽  
M. Constantinou ◽  
K. Hadjiyiannakou ◽  
K. Jansen ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Direct Evaluation ◽  
Physical Point ◽  
Quark Content

GROUNDWATER TIME SERIES

1970 ◽  
Vol 1 (3) ◽  
pp. 181-205 ◽  
Author(s):  
ERIK ERIKSSON
Keyword(s):  
Time Series ◽  
Point Of View ◽  
Hydrologic Models ◽  
Physical Point ◽  
Run Off ◽  
Fort Collins ◽  
Statistical Sense ◽  
Full Benefit ◽  
Future Work ◽  
Prediction Problems

The term “stochastic hydrology” implies a statistical approach to hydrologic problems as opposed to classic hydrology which can be considered deterministic in its approach. During the International Hydrology Symposium, held 6-8 September 1967 at Fort Collins, a number of hydrology papers were presented consisting to a large extent of studies on long records of hydrological elements such as river run-off, these being treated as time series in the statistical sense. This approach is, no doubt, of importance for future work especially in relation to prediction problems, and there seems to be no fundamental difficulty for introducing the stochastic concepts into various hydrologic models. There is, however, some developmental work required – not to speak of educational in respect to hydrologists – before the full benefit of the technique is obtained. The present paper is to some extent an exercise in the statistical study of hydrological time series – far from complete – and to some extent an effort to interpret certain features of such time series from a physical point of view. The material used is 30 years of groundwater level observations in an esker south of Uppsala, the observations being discussed recently by Hallgren & Sands-borg (1968).

scholarly journals Neutron electric dipole moment using lattice QCD simulations at the physical point

2021 ◽  
Vol 103 (5) ◽  
Author(s):  
C. Alexandrou ◽  
A. Athenodorou ◽  
K. Hadjiyiannakou ◽  
A. Todaro
Keyword(s):  
Dipole Moment ◽  
Lattice Qcd ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Neutron Electric Dipole Moment ◽  
Physical Point

scholarly journals Influence of quark content and collision geometry on proton production in heavy ion collisions

2020 ◽  
Vol 1690 ◽  
pp. 012115
Author(s):  
D Larionova ◽  
A Berdnikov ◽  
Ya Berdnikov ◽  
D Kotov ◽  
Iu Mitrankov
Keyword(s):  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Ion Collisions ◽  
Proton Production ◽  
Quark Content

scholarly journals Percolation and tortuosity in heart-like cells

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
R. Rabinovitch ◽  
Y. Biton ◽  
D. Braunstein ◽  
I. Aviram ◽  
R. Thieberger ◽  
...  
Keyword(s):  
Action Potential ◽  
Forest Fire ◽  
Sinus Node ◽  
Heart Tissue ◽  
Point Of View ◽  
Physical Point ◽  
Electrical Currents ◽  
Single Wave ◽  
Heart Arrhythmia ◽  
The One

AbstractIn the last several years, quite a few papers on the joint question of transport, tortuosity and percolation have appeared in the literature, dealing with passage of miscellaneous liquids or electrical currents in different media. However, these methods have not been applied to the passage of action potential in heart fibrosis (HF), which is crucial for problems of heart arrhythmia, especially of atrial tachycardia and fibrillation. In this work we address the HF problem from these aspects. A cellular automaton model is used to analyze percolation and transport of a distributed-fibrosis inflicted heart-like tissue. Although based on a rather simple mathematical model, it leads to several important outcomes: (1) It is shown that, for a single wave front (as the one emanated by the heart's sinus node), the percolation of heart-like matrices is exactly similar to the forest fire case. (2) It is shown that, on the average, the shape of the transport (a question not dealt with in relation to forest fire, and deals with the delay of action potential when passing a fibrotic tissue) behaves like a Gaussian. (3) Moreover, it is shown that close to the percolation threshold the parameters of this Gaussian behave in a critical way. From the physical point of view, these three results are an important contribution to the general percolation investigation. The relevance of our results to cardiological issues, specifically to the question of reentry initiation, are discussed and it is shown that: (A) Without an ectopic source and under a mere sinus node operation, no arrhythmia is generated, and (B) A sufficiently high refractory period could prevent some reentry mechanisms, even in partially fibrotic heart tissue.

scholarly journals Determination of the strange quark content of the nucleon from a next-to-leading-order QCD analysis of neutrino charm production

1995 ◽  
Vol 65 (2) ◽  
pp. 189-198 ◽  
Author(s):  
◽  
A. O. Bazarko ◽  
C. G. Arroyo ◽  
K. T. Bachmann ◽  
T. Bolton ◽  
...  
Keyword(s):  
Strange Quark ◽  
Charm Production ◽  
Leading Order ◽  
Qcd Analysis ◽  
Quark Content
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