Searches for scalar top and scalar bottom quarks at LEP-2
Jul, 199716 pages
Published in:
- Phys.Lett.B 413 (1997) 431-446
e-Print:
- hep-ex/9708013 [hep-ex]
Report number:
- CERN-PPE-97-084,
- CERN-PPE-97-84,
- FSU-SCRI-98-11
Experiments:
Citations per year
Abstract:
Searches for scalar top and bottom quarks have been performed with data collected by the ALEPH detector at LEP. The data sample consists of 21.7 pb^-1 taken at sqrt{s} = 161, 170, and 172~GeV and 5.7 pb^-1 taken at sqrt{s} = 130 and 136~GeV. No evidence for scalar top quarks or scalar bottom quarks was found in the channels stop --> c chi, stop --> b l snu, and sbottom --> b chi. For the channel stop --> c chi a limit of 67 GeV/c^2 has been set on the scalar top quark mass, independent of the mixing angle between the supersymmetric partners of the left and right-handed states of the top quark. This limit assumes a mass difference between the stop and the chi of at least 10 GeV/c^2. For the channel stop --> b l snu the mixing-angle independent scalar top limit is 70 GeV/c^2, assuming a mass difference between the stop and the snu of at least 10 GeV/c^2. For the channel sbottom --> b chi, a limit of 73 GeV/c^2 has been set on the mass of the supersymmetric partner of the left-handed state of the bottom quark. This limit is valid if the mass difference between the sbottom and the chi is at least 10 GeV/c^2.Note:
- Latex (epsfig): 16 pages including 6 figures Report-no: CERN-PPE/97-084
- electron positron: colliding beams
- electron positron: annihilation
- sparticle: search for
- squark: bottom
- squark: top
- squark: decay modes
- mass: squark
- lower limit
- sparticle: mass difference
- ALEPH
References(14)
Figures(16)