BARYON OCTET TO DECUPLET ELECTROMAGNETIC-TRANSITIONS

被引:87
作者
LEINWEBER, DB
DRAPER, T
WOLOSHYN, RM
机构
[1] UNIV MARYLAND,CTR THEORET PHYS,COLL PK,MD 20742
[2] UNIV KENTUCKY,DEPT PHYS & ASTRON,LEXINGTON,KY 40506
[3] TRIUMF,VANCOUVER V6T 2A3,BC,CANADA
来源
PHYSICAL REVIEW D | 1993年 / 48卷 / 05期
关键词
D O I
10.1103/PhysRevD.48.2230
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The electromagnetic transition moments of the SU(3)-flavor baryon octet to decuplet are examined within a lattice simulation of quenched QCD. The magnetic transition moment for the Ny <-- --> DELTA channel is found to be in agreement with recent experimental analyses. The lattice results indicate mu(pDELTA)/mu(p) = 0.88(15). In terms of the Particle Data Group convention, f(M1) = 0.231(41) GeV-1/2 for pgamma <-- --> DELTA+ transitions. Lattice predictions for the hyperon M1 transition moments agree with those of a simple quark model. However the manner in which the quarks contribute to the transition moments in the lattice simulation is different from that anticipated by quark model calculations. The scalar quadrupole form factor exhibits a behavior consistent with previous multipole analyses. The E2/M1 multipole transition moment ratios are also determined. The lattice results suggest R(EM) = -G(E2)/G(M1) = +3 +/- 8% for p gamma <-- --> DELTA+ transitions. Of particular interest are significant nonvanishing signals for the E2/M1 ratio in XI- and SIGMA- electromagnetic transitions.
引用
收藏
页码:2230 / 2249
页数:20
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