Total and differential cross sections for the process e(+)e(-) --> gamma gamma(gamma), and the total cross section for the process e(+)e(-) --> gamma gamma gamma, are measured at energies around 91 GeV using the data collected with the L3 detector from 1991 to 1993. We set lower limits, at 95% CL, on a contact interaction energy scale parameter Lambda > 602 GeV, on the mass of an excited electron m(c)* > 146 GeV and on the QED cut-off parameters Lambda(+) > 149 GeV and Lambda(-) > 143 GeV. Upper limits are also set on the branching fractions of Z decaying into gamma gamma, pi degrees gamma and eta gamma of 5.2 x 10(-5), 5.2 x 10(-5) and 7.6 x 10(-5) respectively. The reactions e(+)e(-) --> rho(+)rho(-)n gamma (rho = e, mu, tau) are studied using the data collected from 1990 to 1994. The data are consistent with the QED expectations.

Tests Qed At Lep Energies Using E(+)e(-)-]gamma-gamma(gamma) and E(+)e(-)-]l(+)l(-)gamma-gamma / 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., Andreev, V.P., Angelescu, T., Antreasyan, D., Arefiev, A., Azemoon, T., Aziz, T., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 353:(1995), pp. 136-144. [10.1016/0370-2693(95)00527-R]

Tests Qed At Lep Energies Using E(+)e(-)-]gamma-gamma(gamma) and E(+)e(-)-]l(+)l(-)gamma-gamma

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

Abstract

Total and differential cross sections for the process e(+)e(-) --> gamma gamma(gamma), and the total cross section for the process e(+)e(-) --> gamma gamma gamma, are measured at energies around 91 GeV using the data collected with the L3 detector from 1991 to 1993. We set lower limits, at 95% CL, on a contact interaction energy scale parameter Lambda > 602 GeV, on the mass of an excited electron m(c)* > 146 GeV and on the QED cut-off parameters Lambda(+) > 149 GeV and Lambda(-) > 143 GeV. Upper limits are also set on the branching fractions of Z decaying into gamma gamma, pi degrees gamma and eta gamma of 5.2 x 10(-5), 5.2 x 10(-5) and 7.6 x 10(-5) respectively. The reactions e(+)e(-) --> rho(+)rho(-)n gamma (rho = e, mu, tau) are studied using the data collected from 1990 to 1994. The data are consistent with the QED expectations.
1995
Tests Qed At Lep Energies Using E(+)e(-)-]gamma-gamma(gamma) and E(+)e(-)-]l(+)l(-)gamma-gamma / 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., Andreev, V.P., Angelescu, T., Antreasyan, D., Arefiev, A., Azemoon, T., Aziz, T., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 353:(1995), pp. 136-144. [10.1016/0370-2693(95)00527-R]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/478884
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