The search for an additional heavy gauge boson Z' is described. The models considered are based on either a superstring-motivated E6 or on a left-right symmetry and assume a minimal Higgs sector. Cross sections and asymmetries measured with the L3 detector in the vicinity of the Z resonance during the 1990 and 1991 running periods are used to determine limits on the Z-Z' gauge boson mixing angle and on the Z' mass. For Z' masses above the direct limits, we obtain the following allowed ranges of the mixing angle, theta(M), at the 95% confidence level: -0.004 less-than-or-equal-to theta(M) less-than-or-equal-to 0.015 for the chi model, -0.003 less-than-or-equal-to theta(M) less-than-or-equal-to 0.020 for the psi model, -0.029 less-than-or-equal-to theta(M) less-than-or-equal-to 0.010 for the eta model, -0.002 less-than-or-equal-to theta(M) less-than-or-equal-to 0.015 for the LR model.

Search For A Z' At the Z Resonance / Adriani, O., Aguilarbenitez, M., Ahlen, S., Alcaraz, J., Aloisio, A., Alverson, G., Alviggi, M., Ambrosi, G., An, Q., Anderhub, H., Anderson, A.L., Andreev, V.P., Antonov, L., Antreasyan, D., Arce, P., Arefiev, A., Atamanchuk, A., Azemoon, T., Aziz, T., P. V. K., ., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 306:(1993), pp. 187-196. [10.1016/0370-2693(93)91156-H]

Search For A Z' At the Z Resonance

ALOISIO, ALBERTO;ALVIGGI, MARIAGRAZIA;L. LISTA;MEROLA, LEONARDO;NAPOLITANO, MARCO;PATRICELLI, SERGIO;SCIACCA, CRISOSTOMO;
1993

Abstract

The search for an additional heavy gauge boson Z' is described. The models considered are based on either a superstring-motivated E6 or on a left-right symmetry and assume a minimal Higgs sector. Cross sections and asymmetries measured with the L3 detector in the vicinity of the Z resonance during the 1990 and 1991 running periods are used to determine limits on the Z-Z' gauge boson mixing angle and on the Z' mass. For Z' masses above the direct limits, we obtain the following allowed ranges of the mixing angle, theta(M), at the 95% confidence level: -0.004 less-than-or-equal-to theta(M) less-than-or-equal-to 0.015 for the chi model, -0.003 less-than-or-equal-to theta(M) less-than-or-equal-to 0.020 for the psi model, -0.029 less-than-or-equal-to theta(M) less-than-or-equal-to 0.010 for the eta model, -0.002 less-than-or-equal-to theta(M) less-than-or-equal-to 0.015 for the LR model.
1993
Search For A Z' At the Z Resonance / Adriani, O., Aguilarbenitez, M., Ahlen, S., Alcaraz, J., Aloisio, A., Alverson, G., Alviggi, M., Ambrosi, G., An, Q., Anderhub, H., Anderson, A.L., Andreev, V.P., Antonov, L., Antreasyan, D., Arce, P., Arefiev, A., Atamanchuk, A., Azemoon, T., Aziz, T., P. V. K., ., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 306:(1993), pp. 187-196. [10.1016/0370-2693(93)91156-H]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/481286
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