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

来源：

NUCLEAR PHYSICS B | 1996年 / 478卷 / 1-2期

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

页码：46 / 58

页数：13

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