Zobrazeno 1 - 10
of 52
pro vyhledávání: '"Tsapalis, Antonios"'
Autor:
Alexandrou, Constantia, Gregory, Eric B., Korzec, Tomasz, Koutsou, Giannis, Negele, John, Sato, Toru, Tsapalis, Antonios
Publikováno v:
PoS Lattice2010:141,2010
We present first results on the axial and pseudoscalar $\Delta$ form factors. The analysis is carried out in the quenched approximation where statistical errors are small and the lattice set-up can be investigated relatively quickly. We also present
Externí odkaz:
http://arxiv.org/abs/1011.0411
Autor:
Alexandrou, Constantia, Korzec, Tomasz, Koutsou, Giannis, Lorcé, Cédric, Negele, John W., Pascalutsa, Vladimir, Tsapalis, Antonios, Vanderhaeghen, Marc
Publikováno v:
Nucl.Phys.A825:115-144,2009
We extend the formalism relating electromagnetic form factors to transverse quark charge densities in the light-front frame to the case of a spin-3/2 baryon and calculate these transverse densities for the $\Delta(1232)$ isobar using lattice QCD. The
Externí odkaz:
http://arxiv.org/abs/0901.3457
Autor:
Alexandrou, Constantia, Korzec, Tomasz, Leontiou, Theodoros, Negele, John W., Tsapalis, Antonios
Publikováno v:
PoSLAT2007:149,2007
We develop a methodology that enables us to extract accurately the electromagnetic Delta form factors and their momentum dependence. We test our approach in the quenched approximation as a preparation for a study using dynamical fermions. Our calcula
Externí odkaz:
http://arxiv.org/abs/0710.2744
Publikováno v:
PoSLAT2006:115,2006
The four N to $\Delta$ axial transition form factors are evaluated using quenched QCD, using two flavors of dynamical Wilson fermions and using domain wall valence fermions on three-flavor MILC configurations for pion masses down to 360 MeV. We provi
Externí odkaz:
http://arxiv.org/abs/hep-lat/0610107
Publikováno v:
PoS LAT2005 (2005) 023
Before studying the pentaquark system we examine the spectral weights of the two lowest scattering states in the two-pion system in the isospin I=2 channel on lattices of size $16^3\times 32$, $24^3 \times 32$ and $32^3 \times 64$ at $\beta=6.0$ in t
Externí odkaz:
http://arxiv.org/abs/hep-lat/0509139
Autor:
Alexandrou, Constantia, Edwards, Robert, Koutsou, Giannis, Leontiou, Theodoros, Neff, Hartmut, Negele, John W., Schroers, Wolfram, Tsapalis, Antonios
Publikováno v:
PoS LAT2005:091,2006
The N to Delta transition form factors GM1, GE2 and GC2 are evaluated using dynamical MILC configurations and valence domain wall fermions at three values of quark mass corresponding to pion mass 606 MeV, 502 MeV and 364 MeV on lattices of spatial si
Externí odkaz:
http://arxiv.org/abs/hep-lat/0509140
Autor:
Pachos, Jiannis, Tsapalis, Antonios
Publikováno v:
Mod.Phys.Lett. A13 (1998) 1371-1382
Within the Schroedinger Electric Representation we analytically calculate the complete wave functional obeying Gauss' law with static SU(2) sources in (1+1)-dimensions. The effective potential is found to be linear in the distance between the sources
Externí odkaz:
http://arxiv.org/abs/hep-th/9710074
Autor:
Petschlies, Marcus, Alexandrou, Constantia, Negele, J. W., Strelchenko, A., Tsapalis, Antonios
Publikováno v:
Physical Review D
Physical Review D-Particles, Fields, Gravitation and Cosmology
Phys Rev D Part Fields Gravit Cosmol
Physical Review D-Particles, Fields, Gravitation and Cosmology
Phys Rev D Part Fields Gravit Cosmol
A method suitable for extracting resonance parameters of unstable baryons in lattice QCD is examined. The method is applied to the strong decay of the Δ to a pion-nucleon state, extracting the πNΔ coupling constant and Δ decay width. © 2013 Amer
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e2823a270ccc9e086ed6ed34d23530f2
Autor:
Alexandrou, Constantia, Gregory, E. B., Korzec, T., Koutsou, Giannis, Negele, J. W., Sato, T., Tsapalis, Antonios
Publikováno v:
Physical Review D-Particles, Fields, Gravitation and Cosmology
Phys Rev D Part Fields Gravit Cosmol
Phys Rev D Part Fields Gravit Cosmol
We present a lattice QCD calculation of the Δ(1232) matrix elements of the axial-vector and pseudoscalar currents. The decomposition of these matrix elements into the appropriate Lorentz invariant form factors is carried out, and the techniques to c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______4485::ade24bd1d01b4d287fd13b7d745f8f73
http://gnosis.library.ucy.ac.cy/handle/7/58420
http://gnosis.library.ucy.ac.cy/handle/7/58420
Autor:
Alexandrou, Constantia, Gregory, E. B., Korzec, T., Koutsou, Giannis, Negele, J. W., Sato, T., Tsapalis, Antonios
Publikováno v:
Physical Review Letters
Phys.Rev.Lett.
Phys.Rev.Lett.
We present the first calculation on the Δ axial vector and pseudoscalar form factors using lattice QCD. Two Goldberger-Treiman relations are derived and examined. A combined chiral fit is performed to the nucleon axial charge, N to Δ axial transiti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bbfaf95bedb5cef08e14550c5fb7a761
https://pubmed.ncbi.nlm.nih.gov/22107185
https://pubmed.ncbi.nlm.nih.gov/22107185
