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Author: Nicole L. Ackerman Publisher: ISBN: Category : Languages : en Pages : 53
Book Description
This thesis is the beginning of a larger project to use BaBar to examine weak couplings through leptonic [tau] decay. I will use the ratio of Br... and Br... and the Michel parameters [rho] and [eta]. which describe the momenta spectrum of the daughter leptons. I studied using a simultaneous fit to the [tau] --> e and [tau] --> [mu] momentum spectra, using [rho], [eta], the ratio Br..., and total number of events as the fit variables. I created a simple Monte Carlo simulation which generated a. sample data spectrum and fit it for the Michel parameters [rho] and [eta]. I used the Monte Carlo to assess the impact of the uncertainties in the detector response function on the measurement of the ratio Br... My conclusion is that the three efficiency uncertainties equally have the greatest effect on the measurement of the number of events. The energy offset affects the measurement of Br... and that the energy scale and offset uncertainties have a non-negligible effect on [rho] and [eta].
Author: Nicole L. Ackerman Publisher: ISBN: Category : Languages : en Pages : 53
Book Description
This thesis is the beginning of a larger project to use BaBar to examine weak couplings through leptonic [tau] decay. I will use the ratio of Br... and Br... and the Michel parameters [rho] and [eta]. which describe the momenta spectrum of the daughter leptons. I studied using a simultaneous fit to the [tau] --> e and [tau] --> [mu] momentum spectra, using [rho], [eta], the ratio Br..., and total number of events as the fit variables. I created a simple Monte Carlo simulation which generated a. sample data spectrum and fit it for the Michel parameters [rho] and [eta]. I used the Monte Carlo to assess the impact of the uncertainties in the detector response function on the measurement of the ratio Br... My conclusion is that the three efficiency uncertainties equally have the greatest effect on the measurement of the number of events. The energy offset affects the measurement of Br... and that the energy scale and offset uncertainties have a non-negligible effect on [rho] and [eta].
Author: Publisher: ISBN: Category : Languages : en Pages : 11
Book Description
We have measured the spectral shape Michel parameters [rho] and [eta] using leptonic decays of the [tau], recorded by the CLEO II detector. Assuming e-[mu] universality, we find [rho]{sub e{mu}}= 0.735 ± 0.013 ± 0.008 and [eta]{sub e{mu}} = 0.015 ± 0.061 ± 0.062, where the first error is statistical and the second systematic.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
This thesis presents a measurement of the tau Michel parameters. This measurement utilizes the highly polarized SLC electron beam to extract these quantities directly from the measured tau decay spectra using the 1993--95 SLD sample of 4,528 tau pair events. The results are[rho][sup e]= 0.71[+-] 0.14[+-] 0.05, [xi][sup e]= 1.16[+-] 0.52[+-] 0.06, and ([xi][delta])[sup e]= 0.85[+-] 0.43[+-] 0.08 for tau decays to electrons and[rho][sup[mu]]= 0.54[+-] 0.28[sup[minus]] 0.14, [eta][sup[mu]]=[minus]0.59[+-] 0.82[+-] 0.45, [xi][sup[mu]]= 0.75[+-] 0.50[+-] 0.14, and ([xi][delta])[sup[mu]]= 0.82[+-] 0.32[+-] 0.07 for tau decays to muons. Combining all leptonic tau decays gives[rho]= 0.72[+-] 0.09[+-] 0.03, [xi]= 1.05[+-] 0.35[+-] 0.04, and[Xi][delta]= 0.88[+-] 0.27[+-] 0.04. These results agree well with the current world average and the Standard Model.
Author: Publisher: ISBN: Category : Languages : en Pages : 194
Book Description
A study of the decay?− → K{sub S}°?−?{sub?} (K{sub S}° →??−) using the BABAR detector is presented. Using 124.4 fb−1 of data we measure?(?− → {bar K}°?−?{sub {tau}}) = (0.830 ± 0.005(stat) ± 0.042(syst))%, which is the world's most precise measurement to date of this branching ratio, and is consistent with the current world average. This preliminary result, unlike most of the?({tau}− → {bar K}°?−?{sub {tau}}) measurements already published, is systematics dominated and so the biggest future improvement to this number should come from reducing the systematic uncertainties in the analysis. A study of the K? mass spectrum, from which the strange (K?) spectral function can be measured, reveals excess contributions above the K*(892) tail at higher K? mass. While in the past this has been thought to be due to K*(892) - K*(1410) interference, we find that the K*(1410), whose branching ratio to K? is approximately 7%, seems insufficient to explain the excess mass observed in the data. Instead, we perform a fit using a K*(892) - K*(1680) interference model and find better agreement. The discrepancy that remains could be due to an s-wave contribution to the interference that is not parameterized in the model used, and/or detector smearing that is not accounted for in our fit. We also attempt to find an s-wave contribution to the K? mass spectrum by searching for an sp-interference effect. While we find a hint that such an effect exists, we have neither the confidence in the statistics nor systematics in the higher K? mass region to announce an observation. We conclude that it would be a worthwhile study to pursue.
Author: Nicole L. Ackerman
Author: Nicole L. Ackerman
Author: 
Author: ARGUS Collaboration
Author: Edmund Peter Whelan
Author: ![Correlated Decay Rates of a [tau] Pair for the Michel Parameter Measurement PDF](https://books.google.com/books/content/images/frontcover/hIJ6PgAACAAJ?fife=w80-h100)
Author: K. Tamai
Author: ![MEASUREMENT of the Michel parameters and the niu ind tau helicity in tau lepton decays [Extras] PDF](https://books.google.com/books/content/images/frontcover/CoyAzwEACAAJ?fife=w80-h100)
Author: S. SCHAEL
Author: 
Author: