THE EFFECTIVE LAGRANGIAN APPROACH TO THE "PROTON-SPIN PUZZLE" AND THE ISSUE OF "TWO COMPONENTS"

1992 ◽  
Vol 07 (01) ◽  
pp. 1-11 ◽  
Author(s):  
J. SCHECHTER ◽  
V. SONI ◽  
A. SUBBARAMAN ◽  
H. WEIGEL
Keyword(s):  
Matrix Element ◽  
Short Distance ◽  
Skyrme Model ◽  
Proton Spin ◽  
Point Of View ◽  
Lagrangian Approach ◽  
Lagrangian Point ◽  
Distance Information ◽  
Effective Lagrangian

The "proton-spin puzzle" is examined from the effective Lagrangian point of view. A generalized (to include "short distance" information) Skyrme model is shown to give a satisfactory picture. We then examine the question of the breakup of the axial singlet matrix element into "matter" and "glue" pieces in this framework.

EFFECTIVE LAGRANGIAN FOR THE TWO-COMPONENT APPROACH TO THE "PROTON SPIN" PUZZLE

1990 ◽  
Vol 05 (30) ◽  
pp. 2543-2553 ◽  
Author(s):  
J. SCHECHTER ◽  
V. SONI ◽  
A. SUBBARAMAN ◽  
H. WEIGEL
Keyword(s):  
Exact Solution ◽  
Matrix Element ◽  
Symmetry Breaking ◽  
Momentum Transfer ◽  
Proton Spin ◽  
Effective Lagrangian ◽  
Two Component ◽  
Component Approach ◽  
Entire Matrix ◽  
Zero Momentum

We display an effective chiral Lagrangian which illuminates the mechanism found by Shore and Veneziano for decomposing the proton matrix element of the axial singlet current into quark and gluonic pieces. The entire matrix element is shown to be proportional to the amplitude for SU(3) singlet exchange in baryon-baryon scattering at zero momentum transfer. An effect of SU(3) symmetry breaking relevant for analysis of the EMC experiment is discussed. In addition, an exact solution is presented for the pseudoscalar quark densities which enter into an alternative method of derivation.

ERRATA: THE EFFECTIVE LAGRANGIAN APPROACH TO THE "PROTON-SPIN" PUZZLE AND THE ISSUE OF "TWO COMPONENTS"

1992 ◽  
Vol 07 (13) ◽  
pp. 1199-1199
Author(s):  
J. Schechter ◽  
V. Soni ◽  
A. Subbaraman ◽  
H. Weigel
Keyword(s):  
Proton Spin ◽  
Lagrangian Approach ◽  
Effective Lagrangian

scholarly journals Photoproduction γp→K+Λ(1520) in an effective Lagrangian approach

2021 ◽  
Vol 103 (3) ◽  
Author(s):  
Neng-Chang Wei ◽  
Yu Zhang ◽  
Fei Huang ◽  
De-Min Li
Keyword(s):  
Lagrangian Approach ◽  
Effective Lagrangian

scholarly journals K → μ+μ− as a clean probe of short-distance physics

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Avital Dery ◽  
Mitrajyoti Ghosh ◽  
Yuval Grossman ◽  
Stefan Schacht
Keyword(s):  
Matrix Element ◽  
Standard Model ◽  
Short Distance ◽  
Time Dependent ◽  
Final States ◽  
Interference Effects ◽  
Fundamental Theory ◽  
Long Distance ◽  
Ckm Matrix ◽  
The Standard Model

Abstract The K → μ+μ− decay is often considered to be uninformative of fundamental theory parameters since the decay is polluted by long-distance hadronic effects. We demonstrate that, using very mild assumptions and utilizing time-dependent interference effects, ℬ(KS → μ+μ−)ℓ=0 can be experimentally determined without the need to separate the ℓ = 0 and ℓ = 1 final states. This quantity is very clean theoretically and can be used to test the Standard Model. In particular, it can be used to extract the CKM matrix element combination $$ \mid {V}_{ts}{V}_{td}\sin \left(\beta +{\beta}_s\right)\mid \approx \mid {A}^2{\lambda}^5\overline{\eta}\mid $$ ∣ V ts V td sin β + β s ∣ ≈ ∣ A 2 λ 5 η ¯ ∣ with hadronic uncertainties below 1%.

scholarly journals Effective-Lagrangian approach to γγ → WW I: Couplings and amplitudes

2006 ◽  
Vol 45 (3) ◽  
pp. 679-691 ◽  
Author(s):  
O. Nachtmann ◽  
F. Nagel ◽  
M. Pospischil ◽  
A. Utermann
Keyword(s):  
Lagrangian Approach ◽  
Effective Lagrangian
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