# MASS LIMITS for Color Octet Neutrinos (${{\boldsymbol \nu}_{{8}}}$) INSPIRE search

$\lambda$ ${}\equiv$ ${\mathit m}_{{{\mathit \ell}_{{8}}}}/{{\mathit \Lambda}}$
VALUE (GeV) CL% DOCUMENT ID TECN  COMMENT
$\bf{>110}$ 90 1
 1989
RVUE ${{\mathit \nu}_{{8}}}$: ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit \nu}_{{8}}}{{\overline{\mathit \nu}}_{{8}}}$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$\text{none 3.8 - 29.8}$ 95 2
 1990
AMY ${{\mathit \nu}_{{8}}}$: ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ acoplanar jets
$\text{none 9-21.9}$ 95 3
 1987 B
JADE ${{\mathit \nu}_{{8}}}$: ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ acoplanar jets
1  BARGER 1989 used ABE 1989B limit for events with large missing transverse momentum. Two-body decay ${{\mathit \nu}_{{8}}}$ $\rightarrow$ ${{\mathit \nu}}{{\mathit g}}$ is assumed.
2  KIM 1990 is at $\mathit E_{{\mathrm {cm}}}$ = $50-60.8$ GeV. The same assumptions as in BARTEL 1987B are used.
3  BARTEL 1987B is at $\mathit E_{{\mathrm {cm}}}$ = $46.3-46.78$ GeV. The limit assumes the ${{\mathit \nu}_{{8}}}$ pair production cross section to be eight times larger than that of the corresponding heavy neutrino pair production. This assumption is not valid in general for the weak couplings, and the limit can be sensitive to its SU(2)$_{\mathit L}{\times }U(1)_{\mathit Y}$ quantum numbers.
References:
 KIM 1990
PL B240 243 A Search for Leptoquark and Colored Lepton Pair Production in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Annihilations at TRISTAN
 BARGER 1989
PL B220 464 Constraints on Exotic Particles from Tevatron Missing Transverse Momentum Data
 BARTEL 1987B
ZPHY C36 15 Search for Leptoquarks and other New Particles with Lepton Hadron Signature in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Interactions
 ABE 1989B
PRL 62 1825 Limits on the Masses of Supersymmetric Particles from 1.8 TeV ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions