We have searched for neutralinos produced via the reactions e(+)e(-) --> chi chi', and e(+)e(-) --> chi'chi', where the next-to lightest neutralino, chi', decays into the lightest neutralino, chi and either a photon or a fermion pair, Based on 1.8 X 10(6) hadronic Z decays collected with the L3 detector at LEP, no signal has been observed. We present upper limits of a few times 10(-5) on the branching ratios Z --> chi chi' and Z --> chi chi'. In the framework of the Minimial Supersymmetric Standard Model, we exclude a lightest chi with m(chi) less than 18 GeV, if either tan beta > 2 or the gluino mass m(g) > 100 GeV.

Search For Neutralinos In Z-decays / Acciarri, M., Adam, A., Adriani, O., Aguilarbenitez, M., Ahlen, S., Alpat, B., Alcaraz, J., Allaby, J., Aloisio, A., Alverson, G., Alviggi, M., Ambrosi, G., An, Q., Anderhub, H., Anderson, A.L., Andreev, V.P., Angelescu, T., Antreasyan, D., Alkhazov, G., Arefiev, A., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 350:(1995), pp. 109-119. [10.1016/0370-2693(95)00260-R]

Search For Neutralinos In Z-decays

ALOISIO, ALBERTO;ALVIGGI, MARIAGRAZIA;CHIEFARI, GIOVANNI;L. LISTA;MEROLA, LEONARDO;NAPOLITANO, MARCO;PATRICELLI, SERGIO;SCIACCA, CRISOSTOMO;
1995

Abstract

We have searched for neutralinos produced via the reactions e(+)e(-) --> chi chi', and e(+)e(-) --> chi'chi', where the next-to lightest neutralino, chi', decays into the lightest neutralino, chi and either a photon or a fermion pair, Based on 1.8 X 10(6) hadronic Z decays collected with the L3 detector at LEP, no signal has been observed. We present upper limits of a few times 10(-5) on the branching ratios Z --> chi chi' and Z --> chi chi'. In the framework of the Minimial Supersymmetric Standard Model, we exclude a lightest chi with m(chi) less than 18 GeV, if either tan beta > 2 or the gluino mass m(g) > 100 GeV.
1995
Search For Neutralinos In Z-decays / Acciarri, M., Adam, A., Adriani, O., Aguilarbenitez, M., Ahlen, S., Alpat, B., Alcaraz, J., Allaby, J., Aloisio, A., Alverson, G., Alviggi, M., Ambrosi, G., An, Q., Anderhub, H., Anderson, A.L., Andreev, V.P., Angelescu, T., Antreasyan, D., Alkhazov, G., Arefiev, A., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 350:(1995), pp. 109-119. [10.1016/0370-2693(95)00260-R]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/478892
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