Abstract
During the operation of LEP, 138000 e{sup +}e{sup -} {yields} {tau}{sup +}{tau}{sup -} events have been collected up to the end of 1992. In the following, the measurements of the total cross section, {sigma}{sub tot}, the forward-backward asymmetry, A{sub fb}, and the two polarization asymmetries, A{sub pol} and A{sub fb-pol}, are reviewed. The partial width of the Z boson to {tau} leptons is measured to be {Gamma}{sub {tau}} = 83.28 {+-} 0.49 MeV. The results for the asymmetries at {radical}s = m{sub Z} are: A{sup {tau}}{sub fb} = 0.0210 {+-} 0.0034, A{sub pol} = -0.142 {+-} 0.017, A{sub fb-pol} = -0.098 {+-} 0.019. The process e{sup +}e{sup -} {yields} {tau}{sup +}{tau}{sup -} is the channel with the highest sensitivity to the neutral current couplings at LEP. The {tau} couplings determined to be y{sub {tau}} = 0.0389 {+-} 0.0037 and a{sub {tau}} = 0.4999 {+-} 0.0015. A model independent measurement of the helicity amplitudes was performed for the first time. All the measurements of the process e{sup +}e{sup -} {yields} {tau}{sup +}{tau}{sup -} confirm the Standard Model. (orig.)
Citation Formats
Kirsch, S.
Neutral current physics with the {tau}lepton at LEP.
Germany: N. p.,
1993.
Web.
Kirsch, S.
Neutral current physics with the {tau}lepton at LEP.
Germany.
Kirsch, S.
1993.
"Neutral current physics with the {tau}lepton at LEP."
Germany.
@misc{etde_10139872,
title = {Neutral current physics with the {tau}lepton at LEP}
author = {Kirsch, S}
abstractNote = {During the operation of LEP, 138000 e{sup +}e{sup -} {yields} {tau}{sup +}{tau}{sup -} events have been collected up to the end of 1992. In the following, the measurements of the total cross section, {sigma}{sub tot}, the forward-backward asymmetry, A{sub fb}, and the two polarization asymmetries, A{sub pol} and A{sub fb-pol}, are reviewed. The partial width of the Z boson to {tau} leptons is measured to be {Gamma}{sub {tau}} = 83.28 {+-} 0.49 MeV. The results for the asymmetries at {radical}s = m{sub Z} are: A{sup {tau}}{sub fb} = 0.0210 {+-} 0.0034, A{sub pol} = -0.142 {+-} 0.017, A{sub fb-pol} = -0.098 {+-} 0.019. The process e{sup +}e{sup -} {yields} {tau}{sup +}{tau}{sup -} is the channel with the highest sensitivity to the neutral current couplings at LEP. The {tau} couplings determined to be y{sub {tau}} = 0.0389 {+-} 0.0037 and a{sub {tau}} = 0.4999 {+-} 0.0015. A model independent measurement of the helicity amplitudes was performed for the first time. All the measurements of the process e{sup +}e{sup -} {yields} {tau}{sup +}{tau}{sup -} confirm the Standard Model. (orig.)}
place = {Germany}
year = {1993}
month = {Nov}
}
title = {Neutral current physics with the {tau}lepton at LEP}
author = {Kirsch, S}
abstractNote = {During the operation of LEP, 138000 e{sup +}e{sup -} {yields} {tau}{sup +}{tau}{sup -} events have been collected up to the end of 1992. In the following, the measurements of the total cross section, {sigma}{sub tot}, the forward-backward asymmetry, A{sub fb}, and the two polarization asymmetries, A{sub pol} and A{sub fb-pol}, are reviewed. The partial width of the Z boson to {tau} leptons is measured to be {Gamma}{sub {tau}} = 83.28 {+-} 0.49 MeV. The results for the asymmetries at {radical}s = m{sub Z} are: A{sup {tau}}{sub fb} = 0.0210 {+-} 0.0034, A{sub pol} = -0.142 {+-} 0.017, A{sub fb-pol} = -0.098 {+-} 0.019. The process e{sup +}e{sup -} {yields} {tau}{sup +}{tau}{sup -} is the channel with the highest sensitivity to the neutral current couplings at LEP. The {tau} couplings determined to be y{sub {tau}} = 0.0389 {+-} 0.0037 and a{sub {tau}} = 0.4999 {+-} 0.0015. A model independent measurement of the helicity amplitudes was performed for the first time. All the measurements of the process e{sup +}e{sup -} {yields} {tau}{sup +}{tau}{sup -} confirm the Standard Model. (orig.)}
place = {Germany}
year = {1993}
month = {Nov}
}