TY - JOUR
T1 - Constituent quark couplings and QCD in the large Nc limit
AU - Peris, Santiago
AU - de Rafael, Eduardo
PY - 1993/7/15
Y1 - 1993/7/15
N2 - It is shown that in the constituent quark model of Georgi-Manohar, the dispersion relation that leads to the Adler- Weisberger sum rule for the axial vector coupling gA requires a subtraction constant. This fact explains the discrepancy between the results of different recent estimates of the 1 Nc corrections to Weinberg's large Nc result gA = 1, where Nc is the number of QCD colours. We also discuss a possible scenario which shows that gA = 1 might not be a necessary consequence of QCD in the large Nc limit. © 1993.
AB - It is shown that in the constituent quark model of Georgi-Manohar, the dispersion relation that leads to the Adler- Weisberger sum rule for the axial vector coupling gA requires a subtraction constant. This fact explains the discrepancy between the results of different recent estimates of the 1 Nc corrections to Weinberg's large Nc result gA = 1, where Nc is the number of QCD colours. We also discuss a possible scenario which shows that gA = 1 might not be a necessary consequence of QCD in the large Nc limit. © 1993.
U2 - https://doi.org/10.1016/0370-2693(93)90950-M
DO - https://doi.org/10.1016/0370-2693(93)90950-M
M3 - Article
VL - 309
SP - 389
EP - 393
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
ER -