| • • • We do not use the following data for averages, fits, limits, etc. • • • |
| $\text{none 55-61}$ |
|
1 |
|
VNS |
| $>45$ |
95 |
2 |
|
HRS |
| $>46.6$ |
95 |
3 |
|
MRKJ |
| $>48$ |
95 |
3 |
|
MRKJ |
|
|
4 |
|
PLUT |
| $\text{none 39.8 - 45.5}$ |
|
5 |
|
MRKJ |
| $>47.8$ |
95 |
5 |
|
MRKJ |
| $\text{none 39.8 - 45.2}$ |
|
5 |
|
CELL |
| $>47$ |
95 |
5 |
|
CELL |
|
1
ODAKA 1989 looked for a narrow or wide scalar resonance in ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ hadrons at $\mathit E_{{\mathrm {cm}}}$ = $55.0-60.8$ GeV.
|
|
2
DERRICK 1986 found no deviation from the Standard Model Bhabha scattering at $\mathit E_{{\mathrm {cm}}}$= 29 GeV and set limits on the possible scalar boson ${{\mathit e}^{+}}{{\mathit e}^{-}}$ coupling. See their figure 4 for excluded region in the $\Gamma\mathrm {( {{\mathit X}^{0}} \rightarrow {{\mathit e}^{+}} {{\mathit e}^{-}} )}-{\mathit m}_{{{\mathit X}^{0}}}$ plane. Electronic chiral invariance requires a parity doublet of ${{\mathit X}^{0}}$, in which case the limit applies for $\Gamma\mathrm {( {{\mathit X}^{0}} \rightarrow {{\mathit e}^{+}} {{\mathit e}^{-}} )}$ = 3 MeV.
|
|
3
ADEVA 1985 first limit is from 2${{\mathit \gamma}}$, ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ , hadrons assuming ${{\mathit X}^{0}}$ is a scalar. Second limit is from ${{\mathit e}^{+}}{{\mathit e}^{-}}$ channel. $\mathit E_{{\mathrm {cm}}}$ = 40$-$47 GeV. Supersedes ADEVA 1984 .
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|
4
BERGER 1985B looked for effect of spin-0 boson exchange in ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ and ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ at $\mathit E_{{\mathrm {cm}}}$ = $34.7$ GeV. See Fig.$~$5 for excluded region in the ${\mathit m}_{{{\mathit X}^{0}}}−\Gamma\mathrm {({{\mathit X}^{0}})}$ plane.
|
|
5
ADEVA 1984 and BEHREND 1984C have $\mathit E_{{\mathrm {cm}}}$ = 39.8$-$45.5 GeV. MARK-J searched ${{\mathit X}^{0}}$ in ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ hadrons, 2${{\mathit \gamma}}$, ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ , ${{\mathit e}^{+}}{{\mathit e}^{-}}$ and CELLO in the same channels plus ${{\mathit \tau}}$ pair. No narrow or broad ${{\mathit X}^{0}}$ is found in the energy range. They also searched for the effect of ${{\mathit X}^{0}}$ with ${\mathit m}_{{{\mathit X}}}$ $>\mathit E_{{\mathrm {cm}}}$. The second limits are from Bhabha data and for spin-0 singlet. The same limits apply for $\Gamma\mathrm {( {{\mathit X}^{0}} \rightarrow {{\mathit e}^{+}} {{\mathit e}^{-}} )}$ = 2 MeV if ${{\mathit X}^{0}}$ is a spin-0 doublet. The second limit of BEHREND 1984C was read off from their figure 2. The original papers also list limits in other channels.
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