Search for ${{\mathit X}^{0}}$ Resonance in ${{\mathit Z}}$ $\rightarrow$ ${{\mathit f}}{{\overline{\mathit f}}}{{\mathit X}^{0}}$

INSPIRE  
The limit is for B( ${{\mathit Z}}$ $\rightarrow$ ${{\mathit f}}{{\overline{\mathit f}}}{{\mathit X}^{0}}$ ) $\cdot{}$ B( ${{\mathit X}^{0}}$ $\rightarrow$ ${{\mathit F}}$ ) where ${{\mathit f}}$ is a fermion and ${{\mathit F}}$ is the specified final state. Spin$~$0 is assumed for ${{\mathit X}^{0}}$ .
VALUE CL% DOCUMENT ID TECN  COMMENT
• • We do not use the following data for averages, fits, limits, etc. • •
1
ABREU
1996T
 DLPH $\mathit f={{\mathit e}}$ ,${{\mathit \mu}}$ ,${{\mathit \tau}}$ ; $\mathit F$= ${{\mathit \gamma}}{{\mathit \gamma}}$
$<3.7 \times 10^{-6}$ 95 2
ABREU
1996T
 DLPH $\mathit f={{\mathit \nu}}$ ; $\mathit F$= ${{\mathit \gamma}}{{\mathit \gamma}}$
3
ABREU
1996T
 DLPH $\mathit f={{\mathit q}}$ ; $\mathit F$= ${{\mathit \gamma}}{{\mathit \gamma}}$
$<6.8 \times 10^{-6}$ 95 2
ACTON
1993E
 OPAL ${{\mathit f}}$ =${{\mathit e}}$ ,${{\mathit \mu}}$ ,${{\mathit \tau}}$ ; ${{\mathit F}}$ = ${{\mathit \gamma}}{{\mathit \gamma}}$
$<5.5 \times 10^{-6}$ 95 2
ACTON
1993E
 OPAL ${{\mathit f}}$ =${{\mathit q}}$ ; ${{\mathit F}}$ = ${{\mathit \gamma}}{{\mathit \gamma}}$
$<3.1 \times 10^{-6}$ 95 2
ACTON
1993E
 OPAL ${{\mathit f}}$ =${{\mathit \nu}}$ ; ${{\mathit F}}$ = ${{\mathit \gamma}}{{\mathit \gamma}}$
$<6.5 \times 10^{-6}$ 95 2
ACTON
1993E
 OPAL ${{\mathit f}}$ =${{\mathit e}}$ ,${{\mathit \mu}}$ ; ${{\mathit F}}$ = ${{\mathit \ell}}{{\overline{\mathit \ell}}}$ , ${{\mathit q}}{{\overline{\mathit q}}}$ , ${{\mathit \nu}}{{\overline{\mathit \nu}}}$
$<7.1 \times 10^{-6}$ 95 2
BUSKULIC
1993F
 ALEP ${{\mathit f}}$ =${{\mathit e}}$ ,${{\mathit \mu}}$ ; ${{\mathit F}}$ = ${{\mathit \ell}}{{\overline{\mathit \ell}}}$ , ${{\mathit q}}{{\overline{\mathit q}}}$ , ${{\mathit \nu}}{{\overline{\mathit \nu}}}$
4
ADRIANI
1992F
 L3 ${{\mathit f}}$ =${{\mathit q}}$ ; ${{\mathit F}}$ = ${{\mathit \gamma}}{{\mathit \gamma}}$
1  ABREU 1996T obtain limit as a function of ${\mathit m}_{{{\mathit X}^{0}}}$. See their Fig.$~$6.
2  Limit is for ${\mathit m}_{{{\mathit X}^{0}}}$ around 60 GeV.
3  ABREU 1996T obtain limit as a function of ${\mathit m}_{{{\mathit X}^{0}}}$. See their Fig.$~$15.
4  ADRIANI 1992F give ${{\mathit \sigma}_{{Z}}}$ $\cdot{}$B( ${{\mathit Z}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}{{\mathit X}^{0}}$ ) $\cdot{}$ B( ${{\mathit X}^{0}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ )$<(0.75 - 1.5)~$pb (95$\%$CL) for ${\mathit m}_{{{\mathit X}^{0}}}$ = $10 - 70$ GeV. The limit is 1$~$pb at 60 GeV.
References:
ABREU 1996T
ZPHY C72 179 Search for High Mass ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ Resonances in ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}{{\mathit \gamma}}{{\mathit \gamma}}$ , ${{\mathit \nu}}$ ${{\overline{\mathit \nu}}}$ ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ and ${{\mathit q}}$ ${{\overline{\mathit q}}}$ ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ at LEP I
ACTON 1993E
PL B311 391 Search for Anomalous Production of High Mass Photon Pairs in ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ Collisions at LEP
BUSKULIC 1993F
PL B308 425 Search for High Mass Photon Pairs in ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit f}}{{\overline{\mathit f}}}{{\mathit \gamma}}{{\mathit \gamma}}$ (f = ${{\mathit e}^{-}}$ , ${{\mathit \mu}}$ , ${{\mathit \tau}}$ , ${{\mathit \nu}}$ , ${{\mathit q}}$ ) at LEP
ADRIANI 1992F
PL B292 472 Isolated Hard Photon Emission in Hadronic ${{\mathit Z}^{0}}$ Decays