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 -