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Search for decays of the Z to unstable neutral leptons with mass between 2.5 and 22 GeV.

  • Author(s): Burchat, PR
  • King, M
  • Abrams, GS
  • Adolphsen, CE
  • Averill, D
  • Ballam, J
  • Barish, BC
  • Barklow, T
  • Barnett, BA
  • Bartelt, J
  • Bethke, S
  • Blockus, D
  • Bonvicini, G
  • Boyarski, A
  • Brabson, B
  • Breakstone, A
  • Bulos, F
  • Burke, DL
  • Cence, RJ
  • Chapman, J
  • Chmeissani, M
  • Cords, D
  • Coupal, DP
  • Dauncey, P
  • DeStaebler, HC
  • Dorfan, DE
  • Dorfan, JM
  • Drewer, DC
  • Elia, R
  • Feldman, GJ
  • Fernandes, D
  • Field, RC
  • Ford, WT
  • Fordham, C
  • Frey, R
  • Fujino, D
  • Gan, KK
  • Gatto, C
  • Gero, E
  • Gidal, G
  • Glanzman, T
  • Goldhaber, G
  • Gomez Cadenas JJ
  • Gratta, G
  • Grindhammer, G
  • Grosse-Wiesmann, P
  • Hanson, G
  • Harr, R
  • Harral, B
  • Harris, FA
  • Hawkes, CM
  • Hayes, K
  • Hearty, C
  • Heusch, CA
  • Hildreth, MD
  • Himel, T
  • Hinshaw, DA
  • Hong, SJ
  • Hutchinson, D
  • Hylen, J
  • Innes, WR
  • Jacobsen, RG
  • Jaros, JA
  • Jung, CK
  • et al.

Using the sample of neutral vector bosons (Z's) produced at the SLAC Linear Collider and detected with the Mark II detector, we search for the decay of the Z to a pair of particles, one of which decays to two charged particles. The observed number of Z decays with this signature excludes, at a confidence level greater than 95%, the decay of the Z to a pair of fourth-generation Dirac neutrinos with mass between 2.5 and 22 GeV, a decay length less than about 1 cm, and coupling to any of the first three generations of charged leptons. This is the first time the existence of such a lepton coupling to the ± has been excluded by a direct search. © 1990 The American Physical Society.

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