Zobrazeno 1 - 10
of 269
pro vyhledávání: '"Ismail Zahed"'
Autor:
Kiminad A. Mamo, Ismail Zahed
Publikováno v:
Nuclear Physics B, Vol 997, Iss , Pp 116388- (2023)
We revisit the electromagnetic form factors of the proton and neutron in the original-minimal soft-wall holographic QCD, which has only two parameters, i.e., the mass scale κ and the twist parameter of the nucleon τ. We first fix τ=3 by the hard s
Externí odkaz:
https://doaj.org/article/4a62c86ea9e84401a081a1ba14a11995
Autor:
Ismail Zahed
Publikováno v:
Symmetry, Vol 14, Iss 5, p 932 (2022)
We briefly review some essential aspects of the QCD instanton vacuum in relation to the quantum breaking of conformal symmetry, the spontaneous breaking of chiral symmetry, and the axial U(1) anomaly. The anomaly causes the intrinsic nucleon spin to
Externí odkaz:
https://doaj.org/article/c60fd83a974543bc9b1b60c85e1221f9
Publikováno v:
Physics Letters B, Vol 773, Iss , Pp 647-653 (2017)
We give qualitative arguments in support of the mesoscopic nature of the Sachdev–Ye–Kitaev (SYK) model in the regime with q2/N≪1 with N Majorana particles coupled by antisymmetric and random interactions of range q. Using a stochastic deformati
Externí odkaz:
https://doaj.org/article/cef57d58a24d472daf9385a097ce8407
Autor:
Yizhuang Liu, Ismail Zahed
Publikováno v:
Physics Letters B, Vol 769, Iss C, Pp 314-321 (2017)
We discuss a minimal holographic model for the description of heavy–light and light mesons with chiral symmetry, defined in a slab of AdS space. The model consists of a pair of chiral Yang–Mills and tachyon fields with specific boundary condition
Externí odkaz:
https://doaj.org/article/ad77f8422fa049dab853812efb4a4962
Autor:
Yizhuang Liu, Ismail Zahed
Publikováno v:
Physics Letters B, Vol 762, Iss , Pp 362-370 (2016)
We revisit the formation of pion-mediated heavy-light exotic molecules with both charm and bottom and their chiral partners under the general strictures of both heavy-quark and chiral symmetry. The chiral exotic partners with good parity formed using
Externí odkaz:
https://doaj.org/article/84ae807f3efb4ed8ab49abe95a923f51
Publikováno v:
Nuclear Physics B, Vol 909, Iss C, Pp 14-42 (2016)
We derive an exact formula for the stochastic evolution of the characteristic determinant of a class of deformed Wishart matrices following from a chiral random matrix model of QCD at finite chemical potential. In the WKB approximation, the character
Externí odkaz:
https://doaj.org/article/509a4ec1bc9c456c8acb3fd04c484366
Publikováno v:
Physics Letters B, Vol 753, Iss C, Pp 65-68 (2016)
We discuss a hydrodynamical description of the eigenvalues of the Polyakov line at large but finite Nc for Yang–Mills theory in even and odd space-time dimensions. The hydro-static solutions for the eigenvalue densities are shown to interpolate bet
Externí odkaz:
https://doaj.org/article/fc6f5138b52049378d6c663b99c91bff
Publikováno v:
Physics Letters B, Vol 753, Iss C, Pp 303-307 (2016)
We discuss a hydrodynamical description of the eigenvalues of the Dirac spectrum in even dimensions in the vacuum and in the large N (volume) limit. The linearized hydrodynamics supports sound waves. The hydrodynamical relaxation of the eigenvalues i
Externí odkaz:
https://doaj.org/article/fd52a0c133f4415fa8d574413bedc0bd
Publikováno v:
Physical Review
This work is a continuation in our series of papers, that addresses quark models of hadronic structure on the light front, motivated by the QCD vacuum structure and lattice results. The spontaneous breaking of chiral symmetry on the light front, is s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::418eff1f2b67096e7e4e692b11c66c08
https://doi.org/10.1103/physrevd.107.094024
https://doi.org/10.1103/physrevd.107.094024
Publikováno v:
Physical Review
We derive a general formula for the replica partition function in the vacuum state, for a large class of interacting theories with fermions, with or without gauge fields, using the equal-time formulation on the light front. The result is used to anal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::654d30ea18155593a9c8bcf6a6426fbc
http://repo.scoap3.org/api
http://repo.scoap3.org/api