scholarly journals Scalar form factor of the nucleon and nucleon-scalar meson coupling constant in QCD

2007 ◽  
Vol 75 (4) ◽  
Author(s):  
T. M. Aliev ◽  
M. Savcı
Keyword(s):  
Form Factor ◽  
Scalar Meson ◽  
Coupling Constant ◽  
Scalar Form Factor ◽  
Scalar Form ◽  
Meson Coupling

scholarly journals THE ROLE OF $K^*_0(1430)$ IN D → PK AND τ → KPντ DECAYS

1999 ◽  
Vol 14 (26) ◽  
pp. 4161-4175 ◽  
Author(s):  
S. FAJFER ◽  
J. ZUPAN
Keyword(s):  
Experimental Data ◽  
Form Factor ◽  
Matrix Element ◽  
Scalar Meson ◽  
Final State Interaction ◽  
Form Factors ◽  
Decay Rates ◽  
Scalar Form Factor ◽  
Meson Resonance ◽  
Scalar Form

We consider the scalar form factor in the weak current matrix element <PK|jμ|0>, P=π, η, η′. It obtains the contributions from the scalar meson resonance [Formula: see text] and from the scalar projection of the vector meson K*(892) resonance. We analyze decay amplitudes of the Cabibbo suppressed decays D → KP, P=π, η, η′ using the factorization approach. The form factors of the relevant matrix elements are described by assuming the dominance of nearby resonances. The annihilation contribution in these decays arises from the matrix element <PK|jμ|0>. All the required parameters are experimentally known except the scalar meson [Formula: see text] decay constant. We fit the decay amplitudes and we find that final state interaction improves the agreement with the experimental data. Then we extract bounds on scalar form factor parameters and compare them with the experimental data obtained in the analyses of K→πeνe and K→πμνμ. The same scalar form factor is present in the τ → KPντ decay, with P=π, η, η′. Using the obtained bounds we investigate the significance of the scalar meson form factor in the τ→ KPντ, P=π, η, η′ decay rates and spectra. We find that the [Formula: see text] scalar meson dominates in the τ→Kη′ντ decay spectrum.

scholarly journals NUCLEAR INTERACTIONS: THE CHIRAL PICTURE

2008 ◽  
Vol 23 (27n30) ◽  
pp. 2273-2280 ◽  
Author(s):  
M. R. ROBILOTTA
Keyword(s):  
Form Factor ◽  
Pion Exchange ◽  
Scalar Form Factor ◽  
Scalar Form ◽  
Central Potential ◽  
Nuclear Interactions

Chiral expansions of the two-pion exchange components of both two- and three-nucleon forces are reviewed and a discussion is made of the predicted pattern of hierarchies. The strength of the scalar-isoscalar central potential is found to be too large and to defy expectations from the symmetry. The causes of this effect can be understood by studying the nucleon scalar form factor.

scholarly journals Dispersive analysis of the scalar form factor of the nucleon

2012 ◽  
Vol 2012 (6) ◽  
Author(s):  
M. Hoferichter ◽  
C. Ditsche ◽  
B. Kubis ◽  
U.-G. Meißner
Keyword(s):  
Form Factor ◽  
Scalar Form Factor ◽  
Scalar Form ◽  
Dispersive Analysis

scholarly journals Scalar form factor of the proton with light-cone QCD sum rules

2006 ◽  
Vol 73 (9) ◽  
Author(s):  
Zhi-Gang Wang ◽  
Shao-Long Wan ◽  
Wei-Min Yang
Keyword(s):  
Form Factor ◽  
Light Cone ◽  
Sum Rules ◽  
Scalar Form Factor ◽  
Qcd Sum Rules ◽  
Scalar Form

A note on the Kt3 scalar form factor

1971 ◽  
Vol 1 (7) ◽  
pp. 285-289 ◽  
Author(s):  
A. N. Kamal ◽  
Radha Gourishankar
Keyword(s):  
Form Factor ◽  
Scalar Form Factor ◽  
Scalar Form

PION AND ρ MESON OBSERVABLES IN A NAMBU–JONA-LASINIO MODEL INCLUDING A TENSOR INTERACTION

2002 ◽  
Vol 17 (32) ◽  
pp. 4903-4925 ◽  
Author(s):  
M. JAMINON ◽  
M. C. RUIVO ◽  
C. A. DE SOUSA
Keyword(s):  
Form Factor ◽  
Electromagnetic Form Factor ◽  
Tensor Interaction ◽  
Text Structure ◽  
Strong Increase ◽  
Total Width ◽  
Scalar Form Factor ◽  
Dominance Model ◽  
Scalar Form ◽  
Scattering Lengths

We calculate the low energy π π scattering lengths [Formula: see text] and [Formula: see text], the coupling of the ρ to the pion gρ π π, the total width of the ρ, the low q2 behavior of the pion electromagnetic form factor, and the pion scalar form factor within a chiral SU(2) f NJL-type Lagrangian where the spin 1 ρ meson is generated from a four-quark tensor interaction. Such a simple model avoids the mathematical complication related to π - a1 mixing. Two types of regularization are discussed, mainly affecting the values of [Formula: see text] and [Formula: see text]. We find rather good agreement with data. The ρ meson described in this way does not account for the meson vector dominance model: it does not contribute to the [Formula: see text] scattering lengths, and the charge radius of the pion is mainly ascribed to the bare photon quark coupling. Even if the shape of the electromagnetic form factor is well reproduced, the strong increase near the ρ pole does not account for the ρ→ππ decay but only reflects the [Formula: see text] structure of the ρ.

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