scholarly journals Valence quark contribution for theγN→Δquadrupole transition extracted from lattice QCD

2009 ◽  
Vol 80 (1) ◽  
Author(s):  
G. Ramalho ◽  
M. T. Peña
Keyword(s):  
Lattice Qcd ◽  
Valence Quark ◽  
Quark Contribution

scholarly journals Valence-quark distribution of the kaon and pion from lattice QCD

2021 ◽  
Vol 103 (1) ◽  
Author(s):  
Huey-Wen Lin ◽  
Jiunn-Wei Chen ◽  
Zhouyou Fan ◽  
Jian-Hui Zhang ◽  
Rui Zhang
Keyword(s):  
Lattice Qcd ◽  
Valence Quark ◽  
Quark Distribution

scholarly journals Pion valence quark distribution from current-current correlation in lattice QCD

2020 ◽  
Vol 102 (5) ◽  
Author(s):  
Raza Sabbir Sufian ◽  
Colin Egerer ◽  
Joseph Karpie ◽  
Robert G. Edwards ◽  
Bálint Joó ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Valence Quark ◽  
Quark Distribution ◽  
Current Correlation

scholarly journals Quark contribution to the proton spin from 2+1+1 -flavor lattice QCD

2018 ◽  
Vol 98 (9) ◽  
Author(s):  
Huey-Wen Lin ◽  
Rajan Gupta ◽  
Boram Yoon ◽  
Yong-Chull Jang ◽  
Tanmoy Bhattacharya ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Proton Spin ◽  
Quark Contribution

scholarly journals Lattice QCD with mixed action – Borici-Creutz valence quark on staggered sea

2018 ◽  
Vol 175 ◽  
pp. 05001
Author(s):  
Subhasish Basak ◽  
Jishnu Goswami ◽  
Dipankar Chakrabarti
Keyword(s):  
Lattice Qcd ◽  
Valence Quark ◽  
Broken Symmetries ◽  
Mixed Action

Mixed action lattice QCD with Borici-Creutz valence quarks on staggered sea is investigated. The counter terms in Borici-Creutz action are fixed nonperturbatively to restore the broken symmetries. On symmetry restoration, the usual signatures of partial quenching / unitarity violation like negative scalar correlator are observed. The size of unitarity violation due to different discretization of valence and sea quark is determined by measuring Δmix.

scholarly journals Bottomonium precision tests from full lattice QCD: Hyperfine splitting, ϒ leptonic width, and b quark contribution to e+e−→hadrons

2021 ◽  
Vol 103 (5) ◽  
Author(s):  
D. Hatton ◽  
C. T. H. Davies ◽  
J. Koponen ◽  
G. P. Lepage ◽  
A. T. Lytle ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Hyperfine Splitting ◽  
Quark Contribution ◽  
B Quark

STUDY OF THE BREATHING MODE OF THE NUCLEON IN α-p AND p-p SCATTERING

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1699-1705 ◽  
Author(s):  
HANS-PETER MORSCH
Keyword(s):  
Electron Scattering ◽  
Cross Sections ◽  
Differential Cross ◽  
Scattering Amplitude ◽  
Valence Quark ◽  
Transition Density ◽  
Mass Region ◽  
Differential Cross Sections ◽  
Roper Resonance ◽  
Quark Contribution

In α-p and p-p scattering at energies in the GeV region a strong "scalar" N* excitation has been observed in the mass region of the lowest P11 resonance, with characteristic properties quite different from the Roper resonance seen in π-N and γ-N. From the t-dependence in p-p scattering a P11 assignment is clearly supported. Further, from exclusive p+p → p p π+ π- data a dominant 2π-N decay of this resonance is deduced. In a DWBA description the differential cross sections were found to be sensitive to the nucleon transition density. To describe all p-p data at beam momenta between 9 and 30 GeV/c a surface peaked transition density had to be utilized. Equivalent information on the charge transition density can be obtained from the longitudinal electron scattering amplitude S1/2, deduced from polarized e-p scattering experiments. Combining the analysis of (p,p') and (e,e'), for the "scalar" P11 we obtain the following results: a) a valence quark excitation is clearly seen, b) strong sea-quark effects are observed, which are significantly larger than the valence quark contribution, c) the sea-quark transition density shows "breathing", indicating that these effects are already present in the g.s. nucleon.

scholarly journals Pion valence quark distribution from matrix element calculated in lattice QCD

2019 ◽  
Vol 99 (7) ◽  
Author(s):  
Raza Sabbir Sufian ◽  
Joseph Karpie ◽  
Colin Egerer ◽  
Kostas Orginos ◽  
Jian-Wei Qiu ◽  
...  
Keyword(s):  
Matrix Element ◽  
Lattice Qcd ◽  
Valence Quark ◽  
Quark Distribution

scholarly journals Direct lattice-QCD calculation of pion valence quark distribution

2019 ◽  
Author(s):  
Jianhui Zhang ◽  
Jiunn-Wei Chen ◽  
Luchang Jin ◽  
Huey-Wen Lin ◽  
Andreas Schäfer ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Valence Quark ◽  
Quark Distribution ◽  
Direct Lattice
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