TY - JOUR

T1 - The vector meson form factor analysis in light-front dynamics

AU - Bakker, Bernard L.G.

AU - Choi, Ho Meoyng

AU - Ji, Chueng Ryong

PY - 2002

Y1 - 2002

N2 - We study the form factors of vector mesons using a covariant fermion field theory model in 3 + 1 dimensions. Performing a light-front (LF) calculation in the q+ = 0 frame in parallel with a manifestly covariant calculation, we note the existence of a nonvanishing zero-mode contribution to the light-front current J+ and find a way of avoiding the zero mode in the form factor calculations. Upon choosing the light-front gauge (∈h=±+ = 0) with circular polarization and with spin projection h = ↑ ↓ = ±, only the helicity zero-to-zero matrix element of the plus current receives zero-mode contributions. Therefore, one can obtain the exact light-front solution of the form factors using only the valence contribution if only the helicity components, (h' h) = (+ +), (+ -), and (+ 0), are used. We also compare our results obtained from the light-front gauge in the light-front helicity basis (i.e. h = ±,0) with those obtained from the non-LF gauge in the instant form linear polarization basis (i.e. h=x,y,z) where the zero-mode contributions to the form factors are unavoidable.

AB - We study the form factors of vector mesons using a covariant fermion field theory model in 3 + 1 dimensions. Performing a light-front (LF) calculation in the q+ = 0 frame in parallel with a manifestly covariant calculation, we note the existence of a nonvanishing zero-mode contribution to the light-front current J+ and find a way of avoiding the zero mode in the form factor calculations. Upon choosing the light-front gauge (∈h=±+ = 0) with circular polarization and with spin projection h = ↑ ↓ = ±, only the helicity zero-to-zero matrix element of the plus current receives zero-mode contributions. Therefore, one can obtain the exact light-front solution of the form factors using only the valence contribution if only the helicity components, (h' h) = (+ +), (+ -), and (+ 0), are used. We also compare our results obtained from the light-front gauge in the light-front helicity basis (i.e. h = ±,0) with those obtained from the non-LF gauge in the instant form linear polarization basis (i.e. h=x,y,z) where the zero-mode contributions to the form factors are unavoidable.

UR - http://www.scopus.com/inward/record.url?scp=0038716050&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.65.116001

DO - 10.1103/PhysRevD.65.116001

M3 - Article

AN - SCOPUS:0038716050

SN - 0556-2821

VL - 65

JO - Physical Review D

JF - Physical Review D

IS - 11

M1 - 116001

ER -