THE EXTENDED BESS MODEL - BOUNDS FROM PRECISION ELECTROWEAK MEASUREMENTS

被引:13
作者
CASALBUONI, R
DECURTIS, S
DEANDREA, A
DIBARTOLOMEO, N
GATTO, R
DOMINICI, D
FERUGLIO, F
机构
[1] UNIV CAMERINO,DIPARTIMENTO MATEMAT & FIS,I-62032 CAMERINO,ITALY
[2] UNIV PADUA,DIPARTIMENTO FIS,I-35100 PADUA,ITALY
[3] INFN,FLORENCE,ITALY
[4] UNIV GENEVA,DEPT PHYS THEOR,CH-1211 GENEVA 4,SWITZERLAND
[5] INFN,PADUA,ITALY
关键词
D O I
10.1016/0550-3213(93)90580-I
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
We present an effective lagrangian parameterization describing scalar, vector, and axial-vector bound states, originating from a strong breaking of the electroweak symmetry, based on the global symmetry SU(N)L x SU(N)R. In this approach vector and axial-vector bound states are gauge bosons associated to a hidden SU(N)L x SU(N)R symmetry. After the gauging of the electroweak symmetry, the corrections to the self-energies of the standard model gauge bosons are calculated and bounds on the parameter space of the model arising from precision measurements are studied. The self-energy corrections arise from spin-one mixings, pseudogoldstone loops, pseudogoldstone spin-one loops, and tadpole terms. The one-loop terms tend to decrease both isospin conserving and isospin violating corrections. Careful calculation for standard SU(8) QCD-scaled technicolor shows that strictly this model (which has, however, serious theoretical difficulties on its own) is still marginally allowed at present experimental precision.
引用
收藏
页码:257 / 289
页数:33
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