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pro vyhledávání: '"Carles Ayala"'
Autor:
Carles Ayala
Publikováno v:
Computer Physics Communications. 70:401-408
The μ( x , β, α) function and related quantities required by QCD-SVZ sum rules are constructed as FORTRAN functions. A careful study of the behaviour of its asymptotic expansions is performed. It is stated that it does not go at the same pace of t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6e3b94b75dbed99eec67f4ffd410d281
https://doi.org/10.1016/0010-4655(92)90202-a
https://doi.org/10.1016/0010-4655(92)90202-a
Autor:
Carles Ayala
Publikováno v:
Annals of Physics. 208:376-401
Approaching SVZ (inverse Laplace transform) sum rules to finite energy sum rules we prove a conjecture recently proposed concerning the stability of the latter in their characteristic parameter. It nicely follows from the SVZ sum rules stability crit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::043305135da73d5cae37600fb89fb39d
https://doi.org/10.1016/0003-4916(91)90300-w
https://doi.org/10.1016/0003-4916(91)90300-w
Autor:
Marià Baig, Carles Ayala
Publikováno v:
Computer Physics Communications. 58:199-209
We present a package of VAX FORTRAN programs that analyze the information coming from two sets of FORTRAN routines. The first set of routines perform strong coupling series expansions in pure SU(2) lattice gauge theory mixed actions. The most general
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::479136063048e677b5d4c5c92ce18bce
https://doi.org/10.1016/0010-4655(90)90145-q
https://doi.org/10.1016/0010-4655(90)90145-q
Autor:
Carles Ayala
We explore the implications of recent work by Br\'ezin and Zinn-Justin, applying the renormalization group techniques from critical phenomena to the scaling limit of matrix models in two-dimensional quantum gravity. They endeavor to get the lowest or
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f74c5f23055e9d4c32d01bdc87a93512
http://arxiv.org/abs/hep-th/9304090
http://arxiv.org/abs/hep-th/9304090
Publikováno v:
Physical Review D. 29:916-920
Predictions for the ..pi gamma gamma.. coupling, the pion charge radius , the q/sup 2/ dependence of the pion decay constant near q/sup 2/ = 0 (f/sub ..pi..//sup prime/(0)), and the ratio ..gamma.. describing radiative pion decay are obtained in the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::904d8d2a563e973b20a4df3e75bf3ccc
https://doi.org/10.1103/physrevd.29.916
https://doi.org/10.1103/physrevd.29.916
Publikováno v:
Physics Letters B. 141:414-418
A joint description of the ratios r ≡ Γ(ψ → η′γ) Γ(ψ → ηγ) and R ≡ Γ(ψ′ → ψ π) Γ(ψ′ → ψη) is achieved in the context of a simple π-η-gh′ mixing model. An η-η′ mixing angle θ ⋍ − 19.5° and a large tadpol
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::af0f2b95ebc6792566768362fb102eca
https://doi.org/10.1016/0370-2693(84)90275-2
https://doi.org/10.1016/0370-2693(84)90275-2
Publikováno v:
Zeitschrift für Physik C Particles and Fields. 26:57-60
A reasonable understanding of the smallness of the ρ′→ππ to the ρ′→ρππ branching ratio in the context of the quark-pair creation model (QPCM) is achieved. Our crucial hypothesis consists in assuming that the ρ can be phenomenologicall
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8b973e40ca86c4a52428dfedf89adac6
https://doi.org/10.1007/bf01572541
https://doi.org/10.1007/bf01572541
Publikováno v:
Physics Letters B. 189:347-353
The (invariant) strange quark mass, m s , and vacuum condensate, 〈ss〉 0 , are discussed in the context of SVZ-sum rules saturated by the scalar κ -meson. The value obtained for m s ( m s ≅360 MeV ) is found to approach its constituent mass val
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4f44360da2c54327fc1c7b92be5b35f4
https://doi.org/10.1016/0370-2693(87)91446-8
https://doi.org/10.1016/0370-2693(87)91446-8
Publikováno v:
Physical Review D. 24:233-235
The sum rule - = n for pseudoscalar-meson charge radii is discussed. Working at the one-loop or quark-triangle approximation and assuming moderate SU(3) breaking for the constituent quark masses, one obtains n = -5/2. Experimental data are compatible
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a6a5ca132e97c8e0e601cd6d5aaa03d8
https://doi.org/10.1103/physrevd.24.233
https://doi.org/10.1103/physrevd.24.233
Publikováno v:
Physics Letters B. 107:235-237
The contribution of contact terms (originated by gauge invariance) to the γγ→ϱ0π+π− transition is evaluated. They are shown to play an essential role in order to explain the large cross section of γγ → π+π−π+π− and the π+π− i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::00facdbe329a72d9231102823c0145f8
https://doi.org/10.1016/0370-2693(81)90819-4
https://doi.org/10.1016/0370-2693(81)90819-4