scholarly journals B→D(*)form factors in perturbative QCD

2003 ◽  
Vol 67 (5) ◽  
Author(s):  
T. Kurimoto ◽  
Hsiang-nan Li ◽  
A. I. Sanda
Keyword(s):  
Perturbative Qcd ◽  
Form Factors

scholarly journals ANALYSIS OF THE $B_q\to D_q(D_q^*)P$ AND $B_q\to D_q(D_q^*)V$ DECAYS WITHIN THE FACTORIZATION APPROACH IN QCD

2009 ◽  
Vol 24 (31) ◽  
pp. 5845-5860 ◽  
Author(s):  
K. AZIZI ◽  
R. KHOSRAVI ◽  
F. FALAHATI
Keyword(s):  
Experimental Data ◽  
Perturbative Qcd ◽  
Sum Rules ◽  
Branching Fraction ◽  
Form Factors ◽  
Transition Form ◽  
Qcd Sum Rules ◽  
Factorization Approach ◽  
Electroweak Penguin ◽  
Decay Widths

Using the factorization approach and considering the contributions of the current–current, QCD penguin and electroweak penguin operators at the leading approximation, the decay amplitudes and decay widths of [Formula: see text] and [Formula: see text] transitions, where q = u, d, s and P and V are pseudoscalar and vector mesons, are calculated in terms of the transition form factors of the Bq→Dq and [Formula: see text]. Having computed those form factors in three-point QCD sum rules, the branching fraction for these decays are also evaluated. A comparison of our results with the predictions of the perturbative QCD as well as the existing experimental data is presented.

INFRARED RENORMALON EFFECTS ON LIGHT MESONS ELECTROMAGNETIC TRANSITION FORM FACTOR FMγ*(Q2, ω)

2003 ◽  
Vol 18 (07) ◽  
pp. 1023-1050 ◽  
Author(s):  
YEGANA V. MAMEDOVA
Keyword(s):  
Form Factor ◽  
Perturbative Qcd ◽  
Transition Form Factor ◽  
Form Factors ◽  
Transition Form ◽  
Coupling Constant ◽  
Electromagnetic Transition ◽  
Qcd Factorization ◽  
Factorization Formula ◽  
Light Mesons

The light pseudoscalar π0, η and η′ mesons electromagnetic transition γ* + γ* → M form factors FMγ*(Q2,ω) are calculated, applying the perturbative QCD factorization formula and the frozen coupling constant approximation. In the computations the O(αS) order expression for FMγ*(Q2,ω) and the mesons' infrared renormalon corrected distribution amplitudes are used. In the case of the η and η′ mesons, the SUf(3) ordinary octet-singlet mixing scheme is utilized. Comparisons are made with the results obtained, employing the mesons' ordinary distribution amplitudes and with γ + γ* → M transition form factors.

Leading-order perturbative QCD calculation of nucleon Dirac form factors

1987 ◽  
Vol 36 (1) ◽  
pp. 165-175 ◽  
Author(s):  
Chueng-Ryong Ji ◽  
Alan F. Sill ◽  
Roselyne M. Lombard-Nelsen
Keyword(s):  
Perturbative Qcd ◽  
Form Factors ◽  
Leading Order

scholarly journals Heavy-quark Form Factors at Two Loops in Perturbative QCD

2017 ◽  
Vol 48 (12) ◽  
pp. 2155
Author(s):  
J. Ablinger ◽  
A. Behring ◽  
J. Blümlein ◽  
G. Falcioni ◽  
A. De~Freitas ◽  
...  
Keyword(s):  
Heavy Quark ◽  
Perturbative Qcd ◽  
Form Factors
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