Chiral Algebra, Configuration Mixing, Magnetic Moments, and Pion Photoproduction

1966 ◽  
Vol 152 (4) ◽  
pp. 1418-1428 ◽  
Author(s):  
I. S. Gerstein ◽  
B. W. Lee
Keyword(s):  
Magnetic Moments ◽  
Pion Photoproduction ◽  
Chiral Algebra ◽  
Configuration Mixing

Chiral Algebra, Configuration Mixing, and Magnetic Moments

1966 ◽  
Vol 16 (23) ◽  
pp. 1060-1062 ◽  
Author(s):  
I. S. Gerstein ◽  
B. W. Lee
Keyword(s):  
Magnetic Moments ◽  
Chiral Algebra ◽  
Configuration Mixing

scholarly journals CHIRAL QUARK MODEL (χQM) AND THE NUCLEON SPIN

2004 ◽  
Vol 19 (29) ◽  
pp. 5027-5041 ◽  
Author(s):  
HARLEEN DAHIYA ◽  
MANMOHAN GUPTA
Keyword(s):  
Angular Momentum ◽  
Magnetic Moments ◽  
Distribution Functions ◽  
Gluon Polarization ◽  
Spin Distribution ◽  
Polarization Functions ◽  
Singlet Component ◽  
Configuration Mixing ◽  
The Right ◽  
E866 Data

Using χ QM with configuration mixing, the contribution of the gluon polarization to the flavor singlet component of the total spin has been calculated phenomenologically through the relation [Formula: see text] as defined in the Adler–Bardeen scheme, where ΔΣ on the right-hand side is Q2 independent. For evaluation the contribution of gluon polarization [Formula: see text], ΔΣ is found in the χ QM by fixing the latest E866 data pertaining to [Formula: see text] asymmetry and the spin polarization functions whereas ΔΣ(Q2) is taken to be 0.30±0.06 and αs=0.287±0.020, both at Q2=5 GeV 2. The contribution of gluon polarization Δg' comes out to be 0.33 which leads to an almost perfect fit for spin distribution functions in the χ QM . When its implications for magnetic moments are investigated, we find perfect fit for many of the magnetic moments. If an attempt is made to explain the angular momentum sum rule for proton by using the above value of Δg', one finds the contribution of gluon angular momentum to be as important as that of the [Formula: see text] pairs.

Kinematical origin of the configuration mixing in the chiral algebra

1974 ◽  
Vol 11 (2) ◽  
pp. 166-168 ◽  
Author(s):  
E. Celeghini ◽  
E. Sorace
Keyword(s):  
Chiral Algebra ◽  
Configuration Mixing

PION PHOTOPRODUCTION IN A GAUGE-INVARIANT CHIRAL UNITARY FRAMEWORK

2014 ◽  
Vol 26 ◽  
pp. 1460075
Author(s):  
MAXIM MAI ◽  
PETER C. BRUNS ◽  
ULF-G. MEIßNER
Keyword(s):  
Magnetic Moments ◽  
Pion Photoproduction ◽  
Low Energy ◽  
Leading Order ◽  
S Wave ◽  
Gauge Invariant ◽  
Unitary Extension ◽  
Pion Nucleon ◽  
Energy Constants ◽  
Order Contact

We investigate pion photoproduction off the proton in a manifestly gauge-invariant chiral unitary extension of chiral perturbation theory. In a first step, we consider meson-baryon scattering taking into account all next-to-leading order contact interactions. The resulting low-energy constants are determined by a fit to s-wave pion-nucleon scattering and the low-energy data for the reaction π-p → ηn. Having determined the low-energy constants, we then analyse the data on the s-wave multipole amplitudes E0+ of pion and eta photoproduction. These are parameter-free predictions, as the two new low-energy constants are determined by the neutron and proton magnetic moments.

scholarly journals Configuration Mixing and Magnetic Moments of Nuclei

1954 ◽  
Vol 11 (4) ◽  
pp. 509-511 ◽  
Author(s):  
Akito Arima ◽  
Hisashi Horie
Keyword(s):  
Magnetic Moments ◽  
Configuration Mixing

scholarly journals Octet baryon magnetic moments in the chiral quark model with configuration mixing

1998 ◽  
Vol 57 (1) ◽  
pp. 452-464 ◽  
Author(s):  
Johan Linde ◽  
Tommy Ohlsson ◽  
Håkan Snellman
Keyword(s):  
Quark Model ◽  
Magnetic Moments ◽  
Chiral Quark Model ◽  
Octet Baryon ◽  
Configuration Mixing

scholarly journals Configuration Mixing and Magnetic Moments of Odd Nuclei

1955 ◽  
Vol 13 (1) ◽  
pp. 127a-127a
Author(s):  
A. Arima ◽  
H. Horie
Keyword(s):  
Magnetic Moments ◽  
Configuration Mixing
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