Measurement of the Z-boson mass using e+e−→Zγ events at centre-of-mass energies above the Z pole

• Published in: Physics letters. B 2004-04, Vol.585 (1-2), p.42-52
• Main Authors: Arefiev, A., Banerjee, Sw, Battiston, R., Bellucci, L., Biasini, M., Biland, A., Blaising, J.J., Böhm, A., Boldizsar, L., Borgia, B., Branson, J.G., Burger, W.J., Capell, M., Carlino, G., Cartacci, A., Casaus, J., Chemarin, M., Chen, A., Chen, H.S., Cifarelli, L., Clare, R., de la Cruz, B., Cucciarelli, S., Debreczeni, J., DeNotaristefani, F., De Salvo, A., Diemoz, M., Doria, A., El Hage, A., Engler, A., Extermann, P., Fisk, I., Freudenreich, K., Gentile, S., van Gulik, R., Hofer, H., Jones, L.W., Kirkby, J., Kittel, W., König, A.C., Kopal, M., Kraemer, R.W., Krüger, A., Ladron de Guevara, P., Landi, G., Lebrun, P., Lecomte, P., Lecoq, P., Le Goff, J.M., Leiste, R., Luci, C., Marzano, F., McNeil, R.R., Metzger, W.J., Natale, S., Nessi-Tedaldi, F., Newman, H., Novak, T., Pal, I., Paramatti, R., Passaleva, G., Pauluzzi, M., Paus, C., Pauss, F., Pistolesi, E., Rahaman, M.A., Raspereza, A., Ren, D., Rosier-Lees, S., Rosenbleck, C., Rykaczewski, H., Saremi, S., Servoli, L., Shevchenko, S., Shoutko, V., Shvorob, A., Son, D., Tang, X.W., Tarjan, P., Timmermans, C., Ting, S.M., Tung, K.L., Ulbricht, J., Van de Walle, R.T., Vasquez, R., Vesztergombi, G., Vetlitsky, I., Vicinanza, D., Vogel, H., Vogt, H., Wang, Q., Wang, X.L., Weber, M., Wienemann, P., Xia, L., Yang, B.Z., Yang, C.G., Yang, M., Yeh, S.C., Zalite, Yu
• Format: Article
• Language: English
• Subjects: Decays of intermediate bosons; Decays of z bosons; Exact sciences and technology; Physics; Specific reactions and phenomenology; The physics of elementary particles and fields
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/j.physletb.2004.01.074

Events from the e+e−→Zγ process with hard initial-state radiation collected with the L3 detector at centre-of-mass energies between 183 and 209 GeV are used to measure the mass of the Z boson. Decays of the Z boson into hadrons or muon pairs are considered and the Z mass is determined to be 91.272±0.032(stat)±0.033(syst) GeV, in agreement with the value measured at the Z resonance. Alternatively, assuming this measured value of the Z mass, the method determines the LEP centre-of-mass energy, found to be 175±68(stat)±68(syst) MeV lower than the nominal value.