S-PARTICLE AND HIGGS-BOSON PRODUCTION AND DETECTION AT CERN LEP-II IN 2 SUPERGRAVITY MODELS

被引:21
作者
LOPEZ, JL
NANOPOULOS, DV
POIS, H
WANG, X
ZICHICHI, A
机构
[1] HOUSTON ADV RES CTR,ASTROPARTICLE PHYS GRP,THE WOODLANDS,TX 77381
[2] CERN,DIV THEORY,CH-1211 GENEVA 23,SWITZERLAND
来源
PHYSICAL REVIEW D | 1993年 / 48卷 / 09期
关键词
D O I
10.1103/PhysRevD.48.4062
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We study the most promising signals for supersymmetry at CERN LEP II in the context of two well-motivated supergravity models: (i) the minimal SU(5) supergravity model including the stringent constraints from proton stability and a not too young universe and (ii) a recently proposed string-inspired no-scale flipped SU(5) supergravity model. Our computations span the neutralino, chargino, slepton, and Higgs sectors together with their interconnections in this class of models. We find that the number of ''mixed'' (1-lepton + 2-jets + p) events occurring in the decay of pair-produced charginos (chi1+/-) is quite significant (per L = 100 pb-1) for both models and that these predictions do not overlap. That is, if m(chi1+/-) < 100 GeV then LEP II should be able to exclude at least one of the two models. In the no-scale flipped SU(5) model we find that the number of acoplanar dielectron events from selectron pair production should allow for exploration of selectron masses up to the kinematical limit and chargino masses indirectly as high as 150 GeV. We find that the cross section e+e- --> Z*h deviates negligibly from the SM result in the minimal model, whereas it can be as much as 1/3 lower in the flipped model. The usually neglected invisible mode h --> chi1(0)chi1(0) can erode the preferred h --> 2 jets signal by as much as 40% in these models. We conclude that the charged slepton sector is a deeper probe than the chargino neutralino, or Higgs sectors of the flipped SU(5) model at LEP II, while the opposite is true for the minimal SU(5) model where the slepton sector is no probe at all.
引用
收藏
页码:4062 / 4075
页数:14
相关论文
共 61 条
[1]   COMPARISON OF GRAND UNIFIED THEORIES WITH ELECTROWEAK AND STRONG COUPLING-CONSTANTS MEASURED AT LEP [J].
AMALDI, U ;
DEBOER, W ;
FURSTENAU, H .
PHYSICS LETTERS B, 1991, 260 (3-4) :447-455
[2]   THE EVOLUTION OF GAUGINO MASSES AND THE SUSY THRESHOLD [J].
ANSELMO, F ;
CIFARELLI, L ;
PETERMAN, A ;
ZICHICHI, A .
NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS, 1992, 105 (04) :581-593
[3]   THE EFFECTIVE EXPERIMENTAL CONSTRAINTS ON MU-SUSY AND MU-GUT [J].
ANSELMO, F ;
CIFARELLI, L ;
PETERMAN, A ;
ZICHICHI, A .
NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS, 1991, 104 (12) :1817-1834
[4]  
ANSELMO F, UNPUB CERN REPORT
[5]   TOP-QUARK AND HIGGS-BOSON MASS BOUNDS FROM A NUMERICAL STUDY OF SUPERSYMMETRIC GRAND UNIFIED THEORIES [J].
ARASON, H ;
CASTANO, DJ ;
KESZTHELYI, BE ;
MIKAELIAN, S ;
PIARD, EJ ;
RAMOND, P ;
WRIGHT, BD .
PHYSICAL REVIEW LETTERS, 1991, 67 (21) :2933-2936
[6]   SUPERSYMMETRIC MASS-SPECTRUM IN SU(5) SUPERGRAVITY GRAND UNIFICATION [J].
ARNOWITT, R ;
NATH, P .
PHYSICAL REVIEW LETTERS, 1992, 69 (05) :725-728
[7]   COSMOLOGICAL CONSTRAINTS AND SU(5) SUPERGRAVITY GRAND UNIFICATION [J].
ARNOWITT, R ;
NATH, P .
PHYSICS LETTERS B, 1993, 299 (1-2) :58-63
[8]  
ARNOWITT R, 1993, PHYS LETT B, V307, pE408
[9]  
ARNOWITT R, 1993, PHYS REV LETT, V70, P3696
[10]   SEARCHING FOR SUPERSYMMETRY AT E+E-SUPERCOLLIDERS [J].
BAER, H ;
BARTL, A ;
KARATAS, D ;
MAJEROTTO, W ;
TATA, X .
INTERNATIONAL JOURNAL OF MODERN PHYSICS A, 1989, 4 (16) :4111-4163