scholarly journals ψ(3770) and B meson exclusive decay B → ψ(3770)K in QCD factorization

2006 ◽  
Vol 28 (3) ◽  
pp. 361-367 ◽  
Author(s):  
Ying-Jia Gao ◽  
Ce Meng ◽  
Kuang-Ta Chao
Keyword(s):  
B Meson ◽  
Qcd Factorization ◽  
Exclusive Decay

Inclusive and Exclusive Decay of B- Meson

1997 ◽  
Vol 12 (37) ◽  
pp. 2873-2882 ◽  
Author(s):  
H. Routh ◽  
V. P. Gautam
Keyword(s):  
Large Scale ◽  
B Meson ◽  
Effective Hamiltonian ◽  
Matrix Elements ◽  
Long Distance ◽  
Logarithmic Approximation ◽  
Fermion Operator ◽  
Color Dipole ◽  
The Matrix ◽  
Exclusive Decay

In our letter we deal with the inclusive and exclusive decay of B- meson. The inclusive b→dγ decay has been considered here including the QCD corrections to the Wilson coefficients and the matrix elements of the operators in the effective Hamiltonian. We calculate the O(αs) virtual corrections to the matrix element for b→dγ, taking into account the contributions of the four-fermion operator O2 and the electromagnetic and color dipole type operators. It drastically reduces the large scale dependence of the leading logarithmic approximation. Moreover, while we are considering the exclusive B-→ρ-γ decay, we have taken into consideration both the short distance as well as long distance contributions. Therefore, we have obtained better result for the partial decay width of B-→ρ-γ.

B0 → J/ψf2(1270) decay in QCD factorization

2012 ◽  
Vol 90 (12) ◽  
pp. 1201-1208 ◽  
Author(s):  
Mahboobeh Sayahi ◽  
Hossein Mahraban
Keyword(s):  
Experimental Data ◽  
B Meson ◽  
Factorization Method ◽  
Branching Ratios ◽  
Hadronic Decay ◽  
Light Meson ◽  
Qcd Factorization ◽  
Effective Coefficients

In this paper, the hadronic decay B0 → J/ψf2(1270) has been analyzed using the “QCD factorization” method. The effective coefficients [Formula: see text] have been calculated for three helicity states (h = 0, +, –) which give three contributions of amplitude. We have assumed two scenarios for J/ψ. First, we have considered that J/ψ behaves as a light meson compared to the B meson and second, we have considered the mass of J/ψ in our calculations meaning that mJ/ψ/mb is held fixed. The branching ratios are calculated in these two scenarios and also in different energy scales (μ = mb, μ = mb/2, and μ = 2mb). The obtained results are in agreement with available experimental data for the second scenario and μ = 2mb.

scholarly journals NONLEPTONIC ANNIHILATION DECAYS OF B MESON WITH A NATURAL INFRARED CUTOFF

2009 ◽  
Vol 24 (22) ◽  
pp. 4133-4155 ◽  
Author(s):  
A. A. NATALE ◽  
C. M. ZANETTI
Keyword(s):  
Systematic Study ◽  
B Mesons ◽  
B Meson ◽  
Coupling Constants ◽  
Final States ◽  
B Decays ◽  
Factorization Approach ◽  
Infrared Behavior ◽  
Qcd Factorization ◽  
Infrared Cutoff

Within the QCD factorization approach we compute the amplitudes for pure annihilation channels of B mesons decays into final states containing two pseudoscalar particles. These decays may be plagued by effects like nonperturbative physics and breaking of the factorization hypothesis and imply, at some extent, the introduction of an infrared cutoff in the calculation of amplitudes. We compute the decays with the help of infrared finite gluon propagators and coupling constants that were obtained in different solutions of the QCD Schwinger–Dyson equations. These solutions yield a natural cutoff for the amplitudes, and we argue that a systematic study of these B decays may provide a test for the QCD infrared behavior.

scholarly journals Problems of QCD factorization in exclusive decays of B meson to charmonium

2003 ◽  
Vol 568 (1-2) ◽  
pp. 127-134 ◽  
Author(s):  
Zhongzhi Song ◽  
Kuang-Ta Chao
Keyword(s):  
B Meson ◽  
Qcd Factorization

scholarly journals B MESON LIGHT-CONE DISTRIBUTION AMPLITUDES AND HEAVY-QUARK SYMMETRY

2003 ◽  
Vol 18 (08) ◽  
pp. 1433-1436 ◽  
Author(s):  
HIROYUKI KAWAMURA ◽  
JIRO KODAIRA ◽  
CONG-FENG QIAO ◽  
KAZUHIRO TANAKA
Keyword(s):  
Heavy Quark ◽  
Light Cone ◽  
Degrees Of Freedom ◽  
B Meson ◽  
Equations Of Motion ◽  
B Meson Decays ◽  
Factorization Approach ◽  
Qcd Factorization ◽  
Heavy Quark Symmetry ◽  
Dynamical Degrees

We present a systematic study of the B meson light-cone distribution amplitudes which are relevant for the QCD factorization approach for the exclusive B meson decays. We construct representations for the quark-antiquark distribution amplitudes in terms of independent dynamical degrees of freedom, which exactly satisfy the QCD equations of motion and constraints from heavy-quark symmetry.

Final state interaction effects in B+→Ds*+ ϕ decay

2014 ◽  
Vol 92 (11) ◽  
pp. 1400-1404
Author(s):  
Hossein Mehraban ◽  
Amin Asadi
Keyword(s):  
Final State Interaction ◽  
Branching Ratio ◽  
Interaction Effects ◽  
State Interaction ◽  
Experimental Result ◽  
Final State ◽  
Qcd Factorization ◽  
Intermediate States ◽  
Exclusive Decay

In this article the exclusive decay of [Formula: see text] is calculated using the QCD factorization (QCDF) method and final state interaction (FSI). First, the [Formula: see text] decay is calculated via the QCDF method and only the annihilation graphs exist in that method. The result found using the QCDF method is lower than the experimental result. FSI is considered to solve the [Formula: see text] decay. For this decay, D+K0, D0K+, and [Formula: see text] via the exchange of K0, K+, and [Formula: see text] are chosen for the intermediate states and we calculate B+ → D+K0 → [Formula: see text] decay. The amplitude of B+ → D+K0 decay is calculated using the QCDF method again. The experimental branching ratio of [Formula: see text] decay is less than 1.2 × 10−5 and our results calculated using the QCDF method and FSI are (0.4 ± 0.06) × 10−7 and (0.93 ± 0.08) × 10−5, respectively.

B→J/ψρ DECAY WITHIN QCD FACTORIZATION APPROACH

2011 ◽  
Vol 26 (40) ◽  
pp. 3041-3054 ◽  
Author(s):  
MAHBOOBEH SAYAHI ◽  
HOSSEIN MEHRABAN
Keyword(s):  
Experimental Data ◽  
B Meson ◽  
Factorization Method ◽  
Branching Ratios ◽  
Light Meson ◽  
Hadronic Decays ◽  
Factorization Approach ◽  
Qcd Factorization ◽  
Effective Coefficients

In this paper, the hadronic decays B+→J/ψρ+ and B0→J/ψρ0 have been analyzed in "QCD factorization" method. The effective coefficients [Formula: see text] have been calculated for three helicity states (h = 0, +, -) which given three contributions of amplitude. We have assumed two scenarios for J/ψ. First, we have considered that J/ψ behaves as a light meson in comparison with B-meson and in other scenario, we have considered mass of J/ψ in our calculations. The branching ratios are calculated in these conditions and also in different energy scales. The obtained results are in agreement with available experimental data at second scenario and μ = mb/2.

scholarly journals CONSTRAINTS ON B→π, K TRANSITION FORM-FACTORS FROM EXCLUSIVE SEMILEPTONIC D-MESON DECAYS

2011 ◽  
Vol 26 (19) ◽  
pp. 3185-3199 ◽  
Author(s):  
FANG SU ◽  
YA-DONG YANG
Keyword(s):  
Phenomenological Study ◽  
B Meson ◽  
D Meson ◽  
Form Factors ◽  
Transition Form ◽  
B Meson Decays ◽  
Factorization Approach ◽  
Meson Decays ◽  
Central Values ◽  
Qcd Factorization

According to the heavy-quark flavor symmetry, the B→π, K transition form-factors could be related to the corresponding ones of D-meson decays near the zero recoil point. With the recent precisely measured exclusive semileptonic decays D →πℓν and D→K ℓν, we perform a phenomenological study of B →π, K transition form-factors based on this symmetry. Using BK, BZ and Series Expansion parametrizations of the form-factor slope, we extrapolate B →π, K transition form-factors from [Formula: see text] to q2 = 0. It is found that, although being consistent with each other within error bars, the central values of our results for B →π, K form-factors at q2 = 0, [Formula: see text], are smaller than predictions of the QCD light-cone sum rules, but are in good agreements with the ones extracted from hadronic B-meson decays within the SCET framework. Moreover, smaller form-factors are also favored by the QCD factorization approach for hadronic B-meson decays.

scholarly journals Final State Interaction Effects on theB+→J/ψρ+Decay

2012 ◽  
Vol 2012 ◽  
pp. 1-19 ◽  
Author(s):  
Behnam Mohammadi ◽  
Hossein Mehraban
Keyword(s):  
Final State Interaction ◽  
Branching Ratio ◽  
State Interaction ◽  
Experimental Result ◽  
Final State ◽  
Qcd Factorization ◽  
Intermediate States ◽  
Quark Diagram ◽  
Exclusive Decay

The exclusive decay ofB+→J/ψρ+is studied in the framework of the QCD factorization (QCDF) method and final state interaction (FSI). A directB+→J/ψρ+decay is only occurred via a tree and a penguin based on the quark diagram analysis. The result that is found by using the QCDF method is less than the experimental result, so, the role of FSI is considered. The intermediate statesD+D̅0,D+*D̅0*,D+*D̅0, andD+D̅0*via the exchange ofD-andD-*are contributed to theB+→J/ψρ+decay. The above intermediate states is calculated by using the QCDF method. In the FSI effects the results of our calculations depend on “η” as the phenomenological parameter. The range of this parameter are selected from 1 to 2. For the exchanged particlesD-andD-*, it is found that ifη=1.58~1.83is selected the numbers of the branching ratio are placed in the experimental range. The experimental branching ratio ofB+→J/ψρ+decay is(5±0.8)×10-5, and our prediction number is(1.42±0.36)×10-5in the absence of FSI effects, and it becomes(4.2~5.8)×10-5when FSI contributions are taken into account.

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