Single-photon signal from neutralinos at LEP2

被引:25
作者
Ambrosanio, S
Mele, B
Montagna, G
Nicrosini, O
Piccinini, F
机构
[1] IST NAZL FIS NUCL,ROME 1,ITALY
[2] UNIV PAVIA,DIPARTIMENTO FIS NUCL & TEOR,I-27100 PAVIA,ITALY
[3] IST NAZL FIS NUCL,I-27100 PAVIA,ITALY
[4] CERN,DIV TH,CH-1211 GENEVA,SWITZERLAND
关键词
D O I
10.1016/0550-3213(96)00421-X
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
The production of invisible pairs of lightest neutralinos accompanied by a large-angle hard e(+)e(-) --> <(chi)over tilde>(0)(1)<(chi)over tilde>(0)(1) gamma is studied at LEP2 energies. The most general gaugino-higgsino composition of the <(chi)over tilde>(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(-) --> nu<(nu)over tilde>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.
引用
收藏
页码:46 / 58
页数:13
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