Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-01-18
Nucl.Phys. B478 (1996) 46-58
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, 6 figures, uuencoded gzipped postscript file. Revised (->shortened) version. To be published in Nuclear Physics B
Scientific paper
10.1016/0550-3213(96)00421-X
The production of invisible pairs of lightest neutralinos accompanied by a large-angle hard photon in the reaction $e^+ e^- \to \chi^0_1 \chi^0_1 \gamma$ is studied at LEP2 energies. The most general gaugino/higgsino composition of the $\chi^0_1$ within the Minimal Supersymmetric Standard Model is assumed. The spectrum of the observed photon is derived within the framework of the $p_t$-dependent structure-function approach, whose accuracy is assessed to be within the foreseen experimental accuracy at LEP2. Higher-order QED corrections due to undetected initial-state radiation are also included. A comparison with the Standard Model main background from $e^+ e^- \to \nu \bar \nu \gamma$ is performed for optimized photon kinematical cuts. Quantitative conclusions on the signal/background ratio are given for a wide range of values of the SUSY parameters.
Ambrosanio Sandro
Mele Barbara
Montagna Guido
Nicrosini Oreste
Piccinini Fulvio
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