On the bounds of CKM matrix element Vcb in a potential model

2014 ◽  
Vol 29 (11n12) ◽  
pp. 1450066 ◽  
Author(s):  
D. K. Choudhury ◽  
Krishna Kingkar Pathak
Keyword(s):  
Matrix Element ◽  
Strong Coupling ◽  
Potential Model ◽  
B Meson ◽  
Scale Parameter ◽  
Strong Coupling Constant ◽  
Coupling Constant ◽  
Ckm Matrix

Considering the allowed range of slope ρ2 and curvature C of Isgur–Wise function for B meson, we obtain an allowed range of strong coupling constant αs as well as the QCD scale parameter Λ in a specific prescription. The allowed range of Λ is then used to obtain the theoretical bounds on Vcb in a potential model. The recent available data of Vcb are found to lie within this computed range 0.0375 ≤|Vcb|≤0.0410.

scholarly journals 2S and 3S State Masses and decay constants of heavy-flavour mesons in a non-relativistic QCD potential model with three-loop effects in V-scheme

2020 ◽  
Vol 80 (12) ◽  
Author(s):  
Rashidul Hoque ◽  
B. J. Hazarika ◽  
D. K. Choudhury
Keyword(s):  
Perturbation Theory ◽  
Strong Coupling ◽  
Potential Model ◽  
Dynamic Properties ◽  
Strong Coupling Constant ◽  
Coupling Constant ◽  
Decay Constants ◽  
Scalar Mesons ◽  
Experimental Values ◽  
Pseudo Scalar

AbstractWe make an analysis of three -loop effects of the strong coupling constant in the study of masses and decay constants of the heavy-flavour pseudo-scalar mesons (PSM) D, $$D_s$$ D s , B, $$B_s,$$ B s , $$B_c$$ B c , $$\eta _c$$ η c and $$\eta _b$$ η b in a non-relativistic QCD potential model using Dalgarno’s perturbation theory (DPT). The first order mesonic wavefunction is obtained using Dalgarno’s perturbation theory. The three-loop effects of strong coupling constant are included in the wave function in co-ordinate space and then used to examine the static and dynamic properties of the heavy-flavour mesons for 2S and 3S higher states. The results are compared with the other models available and are found to be compatible with available experimental values. In V-scheme, the three-loop effects on masses and decay constants of heavy-flavour mesons show a significant result.

scholarly journals RECENT RESULTS FROM LATTICE CALCULATIONS

2005 ◽  
Vol 20 (22) ◽  
pp. 5133-5144 ◽  
Author(s):  
SHOJI HASHIMOTO
Keyword(s):  
Lattice Qcd ◽  
Strong Coupling ◽  
Particle Physics ◽  
Recent Progress ◽  
B Meson ◽  
Strong Coupling Constant ◽  
Matrix Elements ◽  
Coupling Constant ◽  
Quark Masses ◽  
Lattice Calculations

Recent results from lattice QCD calculations relevant to particle physics phenomenology are reviewed. They include the calculations of strong coupling constant, quark masses, kaon matrix elements, and D and B meson matrix elements. Special emphasis is on the recent progress in the simulations including dynamical quarks.

scholarly journals EMC effect at small Bjorken x values

2019 ◽  
Vol 204 ◽  
pp. 05002
Author(s):  
A. Kotikov ◽  
B. Shaikhatdenov ◽  
P. Zhang
Keyword(s):  
Strong Coupling ◽  
Gluon Density ◽  
Strong Coupling Constant ◽  
Coupling Constant ◽  
Emc Effect ◽  
Bjorken X

The Bessel-inspired behavior of parton densities at small Bjorken x values is used along with “frozen” and analytic modifications of the strong coupling constant [1] to study the so-called EMC effect. Among other results, this approach allowed predicting small x behavior of the gluon density in nuclei.

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