Download Free Study Of High Multiplicity 3 Prong Tau Decays At Babar Book in PDF and EPUB Free Download. You can read online Study Of High Multiplicity 3 Prong Tau Decays At Babar and write the review.

This work presents measurements of the branching fractions for tau decays to 3-prong final states using a data set of 430 million tau lepton pairs, corresponding to an integrated luminosity of 468 fb-1, collected with the BaBar detector at the PEP-II asymmetric energy e+e- storage rings. The tau- -> (3pi)- eta nu_tau, tau^- ->pi- 2pi0 omega nu_tau and tau- -> f_1(1285) pi- nu_tau branching fractions are presented as well as a measurement of the non-resonant component of the tau- -> 3pi- 3pi0 nu_tau decay. In addition this work sets a new limit on the branching fraction of the isospin-forbidden, second-class current decay tau- -> pi- eta'(958) nu_tau.
We present measurements of the branching fractions of 3-prong and 5-prong? decay modes using a sample of 430 million? lepton pairs, corresponding to an integrated luminosity of 468 fb−1, collected with the BABAR detector at the PEP-II asymmetric energy ee− storage rings. The?− → (3?)−??{sub?},?− → (3?)− →??{sub?} and {tau}− →?− f1(1285)?{sub {tau}} branching fractions are presented as well as a new limit on the branching fraction of the isospin-forbidden, second-class current {tau}− →?−????????(958)?{sub {tau}} decay. We find no evidence for charged kaons in these decay modes and place the first upper limits on their branching fractions.
The Standard Model of particle physics predicts that the branching ratio for the rare decay B{sup 0} {yields} {tau}{sup +}{tau}{sup -} is 3.1 x 10{sup -8}, though untested models which could supersede it predict large enhancements. This dissertation describes the search for this rare decay in 210.4 fb{sup -1} of B{sup 0}{bar B}{sup 0} data collected at the {Upsilon}(4S) resonance in the Babar detector at the Stanford Linear Accelerator Center. In the analysis, one neutral B meson is fully reconstructed in a hadronic mode and recoil events which are consistent with each tau decaying in a mode {tau} {yields} {pi}{nu}, {rho}{nu}, or l{nu}{bar {nu}} are selected. There is no evidence for signal. The result is consistent with a downward fluctuation by 1.1 statistical standard deviations of the expected Standard Model background. Taking the expected background, the number of observed events and the expected statistical and systematic errors into account yields 2.7 x 10{sup -3} as the upper limit for B{sup 0} {yields} {tau}{sup +}{tau}{sup -} at the 90% confidence level.
Abstract Not Provided.