scholarly journals Weak decay constant of neutral pions in a hot and magnetized quark matter

2013 ◽  
Vol 88 (6) ◽  
Author(s):  
Sh. Fayazbakhsh ◽  
N. Sadooghi
Keyword(s):  
Quark Matter ◽  
Decay Constant ◽  
Weak Decay ◽  
Neutral Pions

Initial charm program on direct measurements of weak decay constant fDs and branching fraction B(Ds → μνμ) and prospect with high-precision

2020 ◽  
Vol 35 (35) ◽  
pp. 2030018
Author(s):  
C. C. Zhang
Keyword(s):  
High Precision ◽  
Decay Constant ◽  
Branching Fraction ◽  
Branching Fractions ◽  
Weak Decay ◽  
Precision Measurements ◽  
Direct Measurements

First direct measurements of the weak decay constant [Formula: see text] and the [Formula: see text] branching fractions to [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] at the BES experiments in 1990s are reviewed. Referring to the BESIII results of [Formula: see text] and branching fraction [Formula: see text] with best precision1 to date, prospect for challenge on precision measurements of [Formula: see text] and [Formula: see text] at BESIII is presented.

scholarly journals Pion weak decay constant at finite density from the instanton vacuum

2008 ◽  
Vol 666 (4) ◽  
pp. 324-331 ◽  
Author(s):  
Seung-il Nam ◽  
Hyun-Chul Kim
Keyword(s):  
Decay Constant ◽  
Weak Decay ◽  
Finite Density ◽  
Instanton Vacuum

scholarly journals EXCITED PIONS, ρ- AND ω-MESONS AND THEIR DECAYS IN A CHIRAL SU(2) × SU(2) LAGRANGIAN

1998 ◽  
Vol 13 (32) ◽  
pp. 5443-5457 ◽  
Author(s):  
M. K. VOLKOV ◽  
D. EBERT ◽  
M. NAGY
Keyword(s):  
Experimental Data ◽  
Excited State ◽  
Decay Constant ◽  
Three Dimensional ◽  
Form Factors ◽  
Weak Decay ◽  
Wave Functions ◽  
Spontaneous Breaking ◽  
Gap Equation ◽  
Decay Widths

A chiral SU(2) × SU(2) Lagrangian containing, besides the usual meson fields, their first radial excitations is considered. The Lagrangian is derived by bosonization of the Nambu–Jona-Lasinio (NJL) quark model with separable nonlocal interactions, with form factors corresponding to three-dimensional ground and excited state wave functions. The spontaneous breaking of chiral symmetry is governed by the NJL gap equation. The first radial excitations of the pions, ρ-and ω-mesons are described with the help of two form factors. The weak decay constant Fπ′ is calculated. The values for the decay widths of the processes ρ→2π, π′→ρπ, ρ′→2π, ρ′→ωπ and ω′→ρπ are obtained in agreement with the experimental data.

scholarly journals PION PROPERTIES AT FINITE DENSITY

2009 ◽  
Vol 24 (11n13) ◽  
pp. 891-894
Author(s):  
SEUNG-IL NAM ◽  
HYUN-CHUL KIM
Keyword(s):  
Quark Model ◽  
Recent Work ◽  
Decay Constant ◽  
Chemical Potential ◽  
Lorentz Invariance ◽  
Pion Mass ◽  
Weak Decay ◽  
Chiral Quark Model ◽  
Time And Space ◽  
Finite Density

In this talk, we report our recent work on the pion weak decay constant (Fπ) and pion mass (mπ) using the nonlocal chiral quark model with the finite quark-number chemical potential (μ) taken into account. Considering the breakdown of Lorentz invariance at finite density, the time and space components are computed separately, and the corresponding results turn out to be: [Formula: see text] and [Formula: see text] at μc ≈ 320 MeV , respectively. Using the in-medium Gell-Mann-Oakes-Renner (GOR) relation, we show that the pion mass increases by about 15% at μc.

Remarks on broken chiral SU(5) × SU(5) symmetry and B mesons

1985 ◽  
Vol 63 (10) ◽  
pp. 1294-1298
Author(s):  
D. Y. Kim ◽  
S. N. Sinha
Keyword(s):  
B Mesons ◽  
Decay Constant ◽  
B Meson ◽  
Weak Decay ◽  
Sum Rule ◽  
Decay Constants ◽  
Symmetry Approach ◽  
Rule Model ◽  
Pseudoscalar Mesons ◽  
The Masses

In a recent paper, Hatzis has estimated the masses and weak decay constants of b-flavored pseudoscalar mesons in a broken chiral SU(5) × SU(5) symmetry method. The estimated weak decay constant of B meson, [Formula: see text], however, does not agree with the value [Formula: see text] evaluated by Mathur et al. with the quantum chromodynamics (QCD) sum-rule model. We re-examined the problem applying the broken chiral SU(5) × SU(5) symmetry approach using a set of mass formulae. With this method we estimate the symmetry-breaking parameters and decay constants of pseudoscalar mesons. We found a consistent result for the decay constant: [Formula: see text]. The explicit numerical value of these constants, however, are lower than that of the QCD sum rule. This may be due to the limited validity of the broken chiral symmetry approach for heavy mesons.

scholarly journals Weak decay constant of pseudoscalar mesons in a QCD-inspired model

2004 ◽  
Vol 34 (1a) ◽  
pp. 297-299 ◽  
Author(s):  
L. A. M. Salcedo ◽  
J.P.B.C. de Melo ◽  
D. Hadjmichef ◽  
T. Frederico
Keyword(s):  
Decay Constant ◽  
Weak Decay ◽  
Pseudoscalar Mesons ◽  
Qcd Inspired Model

Strange Quark Matter as Dark Matter

2019 ◽  
Vol 22 (4) ◽  
pp. 311-317
Author(s):  
Hidezumi Terazawa
Keyword(s):  
Dark Matter ◽  
Quark Matter ◽  
Strange Quark ◽  
Strange Quark Matter ◽  
Quark Stars

New forms of matter such as super-hypernuclei (strange quark matter) and superhypernuclear stars (strange quark stars) as candidates for dark matter are discussed in some detail, based on the so-called "Bodmer–Terazawa–Witten hypothesis" assuming that they are stable absolutely or quasi-stable (decaying only weakly).

Effect of nickel(II) on the biomass yield of the activated sludge

1996 ◽  
Vol 34 (5-6) ◽  
pp. 163-171 ◽  
Author(s):  
Celal F. Gökçay ◽  
Ulku Yetis
Keyword(s):  
Activated Sludge ◽  
Decay Constant ◽  
Biomass Yield ◽  
Culture Conditions ◽  
Synthetic Wastewater ◽  
Base Line ◽  
Microbial Culture ◽  
Feed Composition ◽  
Steady State Condition ◽  
Applied Microbiology

Biomass yield of microorganisms is important in applied microbiology since it is the ultimate factor determining the amount of product produced regardless of whether product is growth-linked or not. In the case of environmental microbiology the opposite is true and minimizing the biomass produced, or the sludge in the relevant jargon, often is the prime goal. In this paper, a unique means of manipulating the microbial biomass yield of a heterogeneous culture to fulfil either of the two goals is presented. 5.0 mgl−1 Ni(II) in the feed composition to a completely mixed, once- through, activated sludge was found to induce the observed biomass yield of the microbial culture developed from sewage. As compared with the base-line study without Ni(II), where the reactor received synthetic wastewater only, true biomass yield was found to have increased along with the increased decay constant with the net effect of lowering observed biomass yield drastically at lower dilution rates and increasing it over that observed in the base-line study at higher dilution rates. At 10.0 mgl−1 influent Ni(II) concentration the culture conditions almost reverted back to the base- line study and at 25 mgl−1 Ni(II) concentration a truly steady-state condition could not be attained.

Lattice Simulation Study of the Properties of Cold Quark Matter with a Nonzero Isospin Density

JETP Letters ◽  
2019 ◽  
Vol 110 (1) ◽  
pp. 1-4 ◽  
Author(s):  
V. V. Braguta ◽  
A. Yu. Kotov ◽  
A. A. Nikolaev
Keyword(s):  
Simulation Study ◽  
Quark Matter ◽  
Lattice Simulation
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