scholarly journals Chiral corrections to hyperon axial form factors

2008 ◽  
Vol 77 (9) ◽  
Author(s):  
Fu-Jiun Jiang ◽  
B. C. Tiburzi
Keyword(s):  
Form Factors ◽  
Axial Form

scholarly journals Nucleon axial form factors using Nf=2 twisted mass fermions with a physical value of the pion mass

2017 ◽  
Vol 96 (5) ◽  
Author(s):  
C. Alexandrou ◽  
M. Constantinou ◽  
K. Hadjiyiannakou ◽  
K. Jansen ◽  
C. Kallidonis ◽  
...  
Keyword(s):  
Pion Mass ◽  
Form Factors ◽  
Twisted Mass ◽  
Axial Form

scholarly journals THE NUCLEON'S MIRROR IMAGE: REVEALING THE STRANGE AND UNEXPECTED

2003 ◽  
Vol 18 (02n06) ◽  
pp. 75-84 ◽  
Author(s):  
R. D. MCKEOWN
Keyword(s):  
Form Factor ◽  
Electron Scattering ◽  
Strange Quark ◽  
Form Factors ◽  
Mirror Image ◽  
Vector Form ◽  
Electromagnetic Structure ◽  
Extensive Program ◽  
Axial Form ◽  
Insight Into

An extensive program of parity-violating electron scattering experiments is providing new insight into the structure of the nucleon. Measurement of the vector form factors enables a definitive study of potential strange quark-antiquark contributions to the nucleon's electromagnetic structure, including the magnetic moment and charge distribution. Recent experimental results have already indicated that effects of strangeness are much smaller than theoretically expected. In addition, the neutral axial form factor appears to display substantial corrections as one might expect from an anapole effect.

scholarly journals Isovector axial form factors of the nucleon in two-flavor lattice QCD

2019 ◽  
Vol 34 (02) ◽  
pp. 1950009 ◽  
Author(s):  
S. Capitani ◽  
M. Della Morte ◽  
D. Djukanovic ◽  
G. M. von Hippel ◽  
J. Hua ◽  
...  
Keyword(s):  
Excited State ◽  
Axial Vector ◽  
Form Factors ◽  
Heavy Baryon ◽  
Axial Current ◽  
Effective Field ◽  
Chiral Effective Field Theory ◽  
Axial Charge ◽  
Systematic Uncertainties ◽  
Axial Form

We present a lattice calculation of the nucleon isovector axial and induced pseudoscalar form factors on the CLS ensembles using [Formula: see text] dynamical flavors of nonperturbatively [Formula: see text]-improved Wilson fermions and an [Formula: see text]-improved axial current together with the pseudoscalar density. Excited-state effects in the extraction of the form factors are treated using a variety of methods, with a detailed discussion of their respective merits. The chiral and continuum extrapolation of the results is performed both using formulae inspired by Heavy Baryon Chiral Perturbation Theory (HBChPT) and a global approach to the form factors based on a chiral effective field theory (EFT) including axial vector mesons. Our results indicate that careful treatment of excited-state effects is important in order to obtain reliable results for the axial form factors of the nucleon, and that the main remaining error stems from the systematic uncertainties of the chiral extrapolation. As final results, we quote [Formula: see text], [Formula: see text], and [Formula: see text] for the axial charge, axial charge radius and induced pseudoscalar charge, respectively, where the first error is statistical and the second is systematic.

q2-Dependence of Heavy-to-Light Transitions

1997 ◽  
Vol 12 (09) ◽  
pp. 653-660 ◽  
Author(s):  
M. A. Ivanov ◽  
Yu. M. Valit
Keyword(s):  
Quark Model ◽  
Form Factors ◽  
Physical Region ◽  
Relativistic Quark Model ◽  
Vector Form ◽  
Pole Dominance ◽  
Axial Form ◽  
Light Form

The q2-dependence of the heavy-to-light form factors in the full physical region is obtained within the relativistic quark model with heavy infrapropagators. It is shown that the behavior of the vector form factors agrees with the pole dominance hypothesis whereas the behavior of the axial form factors is rather different from the polelike function.

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