THE Z-WIDTH IN THE 2 HIGGS DOUBLET MODEL

被引:123
作者
DENNER, A
GUTH, RJ
HOLLIK, W
KUHN, JH
机构
[1] WERNER HEISENBERG INST,MAX PLANCK INST PHYS,MUNICH,GERMANY
[2] UNIV KARLSRUHE,INST THEORET KERNPHYS,W-7500 KARLSRUHE 1,GERMANY
来源
ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS | 1991年 / 51卷 / 04期
关键词
D O I
10.1007/BF01565598
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
Effects from an extended Higgs sector on the partial widths GAMMA-Z --> bbBAR and GAMMA-Z --> tau + tau- are analysed with emphasis on enhanced Yukawa couplings to the fermions with the weak isospin T3 = -1/2. Contributions from charged and neutral Higgs bosons are incorporated. Vertex corrections from a heavy top quark and from charged Higgs bosons are always negative. One can however find regions in the parameter space where neutral Higgs bosons lead to positive vertex corrections. The charged Higgs bosons decouple from the ratio GAMMA-Z --> tau+ tau-/GAMMA-Z --> mu+ mu- if their mass is beyond 80 GeV. This ratio is then sensitive to the neutral sector only.
引用
收藏
页码:695 / 705
页数:11
相关论文
共 30 条
[1]   ELECTROWEAK ONE-LOOP CORRECTIONS TO THE DECAY OF THE NEUTRAL VECTOR BOSON [J].
AKHUNDOV, AA ;
BARDIN, DY ;
RIEMANN, T .
NUCLEAR PHYSICS B, 1986, 276 (01) :1-13
[2]   BHABHA SCATTERING WITH HIGHER-ORDER WEAK LOOP CORRECTIONS [J].
BARDIN, D ;
HOLLIK, W ;
RIEMANN, T .
ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 1991, 49 (03) :485-490
[3]   THE WIDTH OF THE Z-BOSON [J].
BEENAKKER, W ;
HOLLIK, W .
ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 1988, 40 (01) :141-148
[4]   GAMMA(Z-]BBBAR) - A SIGNATURE OF HARD MASS TERMS FOR A HEAVY TOP [J].
BERNABEU, J ;
PICH, A ;
SANTAMARIA, A .
PHYSICS LETTERS B, 1988, 200 (04) :569-574
[5]  
BERTOLINI S, 1986, NUCL PHYS B, V272, P77, DOI 10.1016/0550-3213(86)90341-X
[6]  
BLONDEL A, 1990, CERNEP9010
[7]  
BOHM M, 1986, FORTSCHR PHYS, V34, P687, DOI 10.1002/prop.19860341102
[8]  
BURGERS G, Z PHYSICS LEP, V1, P55
[9]  
CONSOLI M, Z PHYSICS LEP 1, V1, P7
[10]   RELAXATION OF TOP MASS LIMITS IN THE 2-HIGGS-DOUBLET MODEL [J].
DENNER, A ;
GUTH, RJ ;
KUHN, JH .
PHYSICS LETTERS B, 1990, 240 (3-4) :438-440