TY - JOUR
T1 - Excluding light gluinos from Z decays
AU - De Gouvêa, André
AU - Murayama, Hitoshi
N1 - Funding Information:
H.M. thanksM ike Barnett,J ohn Ellis, Lance Dixon, Ian Hinchliffe, and Kam-Bitt Luk for useful conversations. We thank Axe1 Kwiatkowski for comments on the manuscript. A.d.G. was supported by CNPq (Brazil), and H.M. was supportedi n part by the Director, Office of Energy Research,O ffice of High Energy and Nuclear Physics, Division of High Energy Physics of the US Departmento f Energy under Con-tractD E-AC03-76SF00098 and in part by the National Science Foundation under grant PHY-9514797.
PY - 1997/5/8
Y1 - 1997/5/8
N2 - We reanalyze the constraints on light gluinos (mḡ ≤ 5 GeV/c2) from the hadronic Z decays into four jets. We find that the published OPAL data from the 1991 and 1992 runs exclude a light quasi-stable gluino with mass ≲ 1.5 GeV/c2 at more than 90% confidence level. This limit depends little on assumptions about the gluino fragmentation and the definition of the gluino mass. The exclusion confidence level is shown as a function of the mass. A future projection is briefly discussed. We also discuss quantitatively how the distributions in the Bengtsson-Zerwas and the modified Nachtmann-Reiter angles change due to the finite bottom quark or gluino mass. The analysis is limited to the leading-order calculations. We, however, give an empirical reason to why the next-to-leading-order corrections are unlikely to change our conclusions.
AB - We reanalyze the constraints on light gluinos (mḡ ≤ 5 GeV/c2) from the hadronic Z decays into four jets. We find that the published OPAL data from the 1991 and 1992 runs exclude a light quasi-stable gluino with mass ≲ 1.5 GeV/c2 at more than 90% confidence level. This limit depends little on assumptions about the gluino fragmentation and the definition of the gluino mass. The exclusion confidence level is shown as a function of the mass. A future projection is briefly discussed. We also discuss quantitatively how the distributions in the Bengtsson-Zerwas and the modified Nachtmann-Reiter angles change due to the finite bottom quark or gluino mass. The analysis is limited to the leading-order calculations. We, however, give an empirical reason to why the next-to-leading-order corrections are unlikely to change our conclusions.
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U2 - 10.1016/S0370-2693(97)00312-2
DO - 10.1016/S0370-2693(97)00312-2
M3 - Article
AN - SCOPUS:0039978701
SN - 0370-2693
VL - 400
SP - 117
EP - 123
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 1-2
ER -