MASS LIMITS for Excited Neutrino (${{\boldsymbol \nu}^{*}}$)

Limits for Excited ${{\boldsymbol \nu}}$ (${{\boldsymbol \nu}^{*}}$) from Single Production INSPIRE search

These limits are from ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \nu}}{{\mathit \nu}^{*}}$ , ${{\mathit Z}}$ $\rightarrow$ ${{\mathit \nu}}{{\mathit \nu}^{*}}$ , or ${{\mathit e}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \nu}^{*}}{{\mathit X}}$ and depend on transition magnetic coupling between ${{\mathit \nu}}/{{\mathit e}}$ and ${{\mathit \nu}^{*}}$. Assumptions about ${{\mathit \nu}^{*}}$ decay mode are given in footnotes.
VALUE (GeV) CL% DOCUMENT ID TECN  COMMENT
$\bf{> 213}$ 95 1
AARON
2008
H1 ${{\mathit e}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \nu}^{*}}{{\mathit X}}$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$>190$ 95 2
ACHARD
2003B
L3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \nu}}{{\mathit \nu}^{*}}$
$\text{none 50 - 150}$ 95 3
ADLOFF
2002
H1 ${{\mathit e}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \nu}^{*}}$ X
$>158$ 95 4
CHEKANOV
2002D
ZEUS ${{\mathit e}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \nu}^{*}}$ X
1  AARON 2008 search for single ${{\mathit \nu}^{*}}$ production in ${{\mathit e}}{{\mathit p}}$ collisions with the decays ${{\mathit \nu}^{*}}$ $\rightarrow$ ${{\mathit \nu}}{{\mathit \gamma}}$ , ${{\mathit \nu}}{{\mathit Z}}$ , ${{\mathit e}}{{\mathit W}}$ . The quoted limit assumes $\mathit f$ = $−{{\mathit f}^{\,'}}$ = $\Lambda /{\mathit m}_{{{\mathit \nu}^{*}}}$. See their Fig. 3 and Fig. 4 for the exclusion plots in the mass-coupling plane.
2  ACHARD 2003B result is from ${{\mathit e}^{+}}{{\mathit e}^{-}}$ collisions at $\sqrt {\mathit s }$ = $189 - 209$ GeV. The quoted limit is for ${{\mathit \nu}_{{e}}^{*}}$. ${{\mathit f}}$ = $\text{-}{{\mathit f}^{\,'}}$ = $\Lambda /{\mathit m}_{{{\mathit \nu}^{*}}}$ is assumed. See their Fig.$~$4 for the exclusion plot in the mass-coupling plane.
3  ADLOFF 2002 search for single ${{\mathit \nu}^{*}}$ production in ${{\mathit e}}{{\mathit p}}$ collisions with the decays ${{\mathit \nu}^{*}}$ $\rightarrow$ ${{\mathit \nu}}{{\mathit \gamma}}$ , ${{\mathit \nu}}{{\mathit Z}}$ , ${{\mathit e}}{{\mathit W}}$ . The quoted limit assumes ${{\mathit f}}$ = $−{{\mathit f}^{\,'}}$ = $\Lambda /{\mathit m}_{{{\mathit \nu}^{*}}}$. See their Fig.$~$1 for the exclusion plots in the mass-coupling plane.
4  CHEKANOV 2002D search for single ${{\mathit \nu}^{*}}$ production in ${{\mathit e}}{{\mathit p}}$ collisions with the decays ${{\mathit \nu}^{*}}$ $\rightarrow$ ${{\mathit \nu}}{{\mathit \gamma}}$ , ${{\mathit \nu}}{{\mathit Z}}$ , ${{\mathit e}}{{\mathit W}}$ . ${{\mathit f}}$ = $−{{\mathit f}^{\,'}}$ = $\Lambda /{\mathit m}_{{{\mathit \nu}^{*}}}$ is assumed for the ${{\mathit e}^{*}}$ coupling. CHEKANOV 2002D also obtain limit for ${{\mathit f}}$ = ${{\mathit f}^{\,'}}$ = $\Lambda /{\mathit m}_{{{\mathit \nu}^{*}}}$: ${\mathit m}_{{{\mathit \nu}^{*}}}>$135 GeV. See their Fig.$~$5c and Fig.$~$5d for the exclusion plot in the mass-coupling plane.
  References:
AARON 2008
PL B663 382 A Search for Excited Neutrinos in ${{\mathit e}^{-}}{{\mathit p}}$ Collisions at HERA
ACHARD 2003B
PL B568 23 Search for Excited Leptons at LEP
ADLOFF 2002
PL B525 9 Search for Excited Neutrinos at HERA
CHEKANOV 2002D
PL B549 32 Searches for Excited Fermions in ${{\mathit e}}{{\mathit p}}$ Collisions at HERA