Zobrazeno 1 - 6
of 6
pro vyhledávání: '"M. R. Ahmady"'
Autor:
M. R. Ahmady, F. Mahmoudi
Publikováno v:
Modern Physics Letters A. 24:3173-3181
The branching ratio for the rare two-body Bs → ργ decay is calculated using the factorization assumption. This transition is dominated by the annihilation diagrams and, in principle, prone to receiving substantial contributions from new physics.
Autor:
R. R. Mendel, M. R. Ahmady
Publikováno v:
Physical Review D. 51:141-146
We use a simple perturbation theory argument and measurements of charmonium leptonic widths $\Gamma (\psi_{NS} \rightarrow e^+e^-)$ to estimate the ratio \mbox{$R_\circ \equiv {\vert \Psi _{\eta_{c1S}}(0) \vert}^2 /{\vert\Psi_{\psi_{1 S}}(0)\vert}^2$
Publikováno v:
Zeitschrift für Physik C Particles and Fields. 56:395-406
Quark-condensate contributions to triangle amplitudes arising from the nonperturbative content of the QCD vacuum are shown to uphold the anomalous axial Ward identity to leading and next-to-leading order in both the expansion parameter [m quark/momen
Autor:
M. R. Ahmady, F. Mahmoudi
Publikováno v:
Fundamental Interactions.
Autor:
Farrukh Chishtie, A. H. Fariborz, D. G. C. McKeon, V. Elias, T. G. Steele, T. N. Sherry, M. R. Ahmady
Publikováno v:
Physical Review D. 65
The renormalization-scale $(\ensuremath{\mu})$ dependence of the two-loop inclusive semileptonic $\stackrel{\ensuremath{\rightarrow}}{b}{\mathrm{cl}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{l}$ decay rate is shown to be significant in the pole
Publikováno v:
AIP Conference Proceedings.
Utilizing asymptotic Pade-approximant methods, we estimate the three-loop order MS¯ coefficients of αs3[log(μ2/mb2(μ))]k terms [k={0,1,2,3}] within the b→ul−νl decay rate. Except for the coefficient of the k=0 term, all other coefficients ma