SIGNALS FOR SUPERSYMMETRY AT HERA

被引:50
作者
DREINER, H [1 ]
MORAWITZ, P [1 ]
机构
[1] UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND
关键词
D O I
10.1016/0550-3213(94)90190-2
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 consider the baryon parity signals at HERA for the case of the MSSM production mechanisms and the decays via the lepton number violating couplings <L(i)Q(D)over bar>. We can probe very small Yukawa couplings lambda' greater than or similar to 3 . 10(-6), limited only by the decay length of the LSP. We assume the LSP to be the lightest neutralino and study its decays in detail. We present the matrix element squared for the tree-level decay amplitude of a generally mixed neutralino explicitly. We find that the branching fraction to charged leptons strongly depends on the SUSY parameters and can differ significantly from the naively expected 50%. The SUSY mass reaches of the studied processes in the ZEUS detector at HERA were found to be: (m((e) over tilde, <(nu)over tilde>) + m((q) over tilde)) less than or equal to 170 GeV, 195 GeV and 205 GeV for the <L(tau)Q(D)over bar>, <L(mu)Q(D)over bar> and <L(e)Q(D)over bar> couplings respectively. These are well above existing limits on R-parity violating (R/p) SUSY from previous experiments. We conclude that HERA offers a very promising discovery potential for R/p SUSY.
引用
收藏
页码:31 / 60
页数:30
相关论文
共 53 条
[1]  
ALI A, 1987, OCT P HERA WORKSH DE
[2]  
ALI A, 1991, NOV P HERA WORKSH DE
[3]   CONSTRAINTS ON SUPERSYMMETRIC PARTICLES FROM THE CERN LEP DATA ON Z0 DECAY PROPERTIES [J].
BAER, H ;
DREES, M ;
TATA, X .
PHYSICAL REVIEW D, 1990, 41 (11) :3414-3420
[4]   RARE Z0 DECAYS FROM R-PARITY VIOLATION [J].
BARBIERI, R ;
BRAHM, DE ;
HALL, LJ ;
HSU, SDH .
PHYSICS LETTERS B, 1990, 238 (01) :86-91
[5]   SOME NEW ASPECTS OF SUPERSYMMETRY R-PARITY VIOLATING INTERACTIONS [J].
BARGER, V ;
GIUDICE, GF ;
HAN, T .
PHYSICAL REVIEW D, 1989, 40 (09) :2987-2996
[6]   SELECTRON AND SQUARK PRODUCTION IN EP COLLISIONS AT HERA [J].
BARTELS, J ;
HOLLIK, W .
ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 1988, 39 (03) :433-441
[7]  
BARTELS J, 1987, OCT P HERA WORKSH DE
[8]   SIGNATURES FOR SNEUTRINO AND SQUARK PRODUCTION IN EP COLLISIONS [J].
BARTL, A ;
FRAAS, H ;
MAJEROTTO, W .
ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 1988, 41 (03) :475-483
[9]   PRODUCTION AND DECAY OF SELECTRONS AND SQUARKS IN EP COLLISIONS [J].
BARTL, A ;
FRAAS, H ;
MAJEROTTO, W .
NUCLEAR PHYSICS B, 1988, 297 (03) :479-497
[10]   CHARGINO PRODUCTION AT LEP-200 [J].
BARTL, A ;
FRAAS, H ;
MAJEROTTO, W ;
MOSSLACHER, B .
ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 1992, 55 (02) :257-264