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Languages : en
Pages : 7
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A search for lepton flavor violating decays of a [tau] to a lighter-mass charged lepton and an [omega] vector meson is performed using 384.1 fb−1 of ee− annihilation data collected with the BABAR detector at the Stanford Linear Accelerator Center PEP-II storage ring. No signal is found, and the upper limits on the branching ratios are determined to be [beta]([tau]{sup {+-}} 2!e{sup {+-}}[omega])
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Languages : en
Pages : 7
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A search for lepton flavor violating decays of a [tau] to a lighter-mass charged lepton and an [omega] vector meson is performed using 384.1 fb−1 of ee− annihilation data collected with the BABAR detector at the Stanford Linear Accelerator Center PEP-II storage ring. No signal is found, and the upper limits on the branching ratios are determined to be [beta]([tau]{sup {+-}} 2!e{sup {+-}}[omega])
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Languages : en
Pages : 9
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A search for the lepton flavor violating decays?− → l− K{sub S}° (l = e or?) has been performed using a data sample corresponding to an integrated luminosity of 469 fb−1, collected with the BABAR detector at the SLAC PEP-II ee− asymmetric energy collider. No statistically significant signal has been observed in either channel and the estimated upper limits on branching fractions are?(?− → e− K{sub S}°)
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Languages : en
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Languages : en
Pages : 122
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The Standard Model (SM) is one of the most tested and verified physical theories of all time, present experimental observations are consistent with SM expectations. On the other hand SM can not explain many physical observations: the cosmological observations possibly infer the presence of dark matter which is clearly beyond the SM expectations; the SM Higgs model, while explaining the generation of fermion masses, can not explain the hierarchy problem and a non natural fine tuning of SM is needed to cancel out quadratic divergences in the Higgs boson mass. New physics (NP) beyond SM should hence be investigated: rising the energy above NP processes thresholds, and detecting new particles or new effects not predicted by the standard model directly, is one of the possible approaches; another approach is to make precision measurements of well known processes or looking for rare processes which involve higher order contribution from NP processes, this approach need higher luminosities with respect to the previous approach but lower beam energies. Search for Lepton Flavor Violation (LFV) in charged lepton decays is promising: neutrino physics provides indeed a clear and unambiguous evidence of LFV in the neutral lepton sector via mixing processes, which have been observed for the first time by the Homestake collaboration. We expect LFV in the charged sector as well, both in [mu] and [tau] sector, but current experimental searches for LFV processes did not find any evidence for those processes, and more results are expected to come from new experiments in the coming years.
![Search for Lepton Flavour Violating Decays Tau -] L Ks with the BABAR Detector PDF](https://books.google.com/books/content/images/frontcover/A3dCAQAACAAJ?fife=w80-h100)
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Languages : en
Pages : 171
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We present the search for the lepton flavour violating decay [tau] → lK°{sub s} with the BaBar experiment data. This process and many other lepton flavour violating [tau] decays, like [tau] → [mu][gamma] and [tau] → lll, are one of the most promising channel to search for evidence of new physics. According to the Standard Model and the neutrino mixing parameters, branching fractions are estimated well below 10−14, but many models of new physics allow for branching fractions values close to the present experimental sensitivity. This analysis is based on a data sample of 469fb−1 collected by BABAR detector at the PEP-II storage ring from 1999 to 2007, equivalent to 431 millions of [tau] pairs. the BABAR experiment, initially designed for studying CP violation in B mesons, has demonstrated to be one of the most suitable environments for studying [tau] decays. The tracking system, the calorimeter and the particle identification of BABAR, together with the knowledge of the [tau] initial energy, allow an extremely powerful rejection of background events that, for this analysis, is better than 10−9. Being [tau] → lK°{sub s} a decay mode without neutrinos, the signal [tau] decay can be fully reconstructed. Kinematical constraints are used in a fit that provides a decay tree reconstruction with a high resolution. For this analysis MC simulated events play a decisive role for estimating the signal efficiency and study the residual background. High statistics MC sample are produced simulating detector conditions for different periods of data collection, in order to reduce any discrepancies with the data. When discrepancies can not be removed, we perform studies to compute a correction factor or an estimation of systematic errors that need to be included in the final measurement. A significant improvement of the current result can be reached only with a higher statistics and, therefore, with a new collider providing a luminosity from 10 to 100 times more than PEP-II. A new detector, with improved performance and able to collect data in a high background environment, is also requested to fully exploit the capability of such amount of data. In fact, only keeping the efficiency and the background as similar as possible to present ones, we will be able to scale almost linearly the estimated upper limit according to the luminosity. The strong potential of improvement for the search of lepton flavour violation [tau] decays makes the building of such a machine highly desirable.
![A Search for the Lepton-flavour Violating Decays [tau] → E[alpha], [tau] → [my Alpha] PDF](https://books.google.com/books/content/images/frontcover/dbt3zQEACAAJ?fife=w80-h100)
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Languages : en
Pages : 8
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![Search for Lepton Flavor Violation in the Decays Tau-]e Gamma and Tau-]mu Gamma PDF](https://books.google.com/books/content/images/frontcover/_jKcnQAACAAJ?fife=w80-h100)
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Languages : en
Pages : 7
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Searches for lepton-flavor-violating decays of a [tau] lepton to a lighter mass lepton and a photon have been performed with the entire dataset of (963 ± 7) x 106 [tau] decays collected by the BABAR detector near the [Upsilon](4S), [Upsilon](3S) and [Upsilon](2S) resonances. The searches yield no evidence of signals and they set upper limits on the branching fractions of [Beta]([tau]{sup {+-}} 2!e{sup {+-}}[gamma])
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Languages : en
Pages : 5
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A search for the lepton-flavor-violating decay of the tau into one charged lepton and two charged hadrons has been performed using 221.4 fb−1 of data collected at an ee− center-of-mass energy around 10.58 GeV with the BABAR detector at the PEP-II storage ring. In all 14 decay modes considered, the numbers of events found in data are compatible with the background expectations. Upper limits on the branching fractions are set in the range (0.7-4.8) x 10−7 at 90% confidence level. All results are preliminary.
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Languages : en
Pages : 7
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A search for lepton flavor violating decays of the [tau] lepton to a lighter mass lepton and a pseudoscalar meson has been performed using 339 fb−1 of ee− annihilation data collected at a center-of-mass energy near 10.58GeV by the BABAR detector at the SLAC PEP-II storage ring. No evidence of signal has been found, and upper limits on the branching fractions are set at 10−7 level.
![A Search for the Lepton-flavour Violating Decays [tau Approaches E Alpha, Tau Approaches Mu Alpha] PDF](https://books.google.com/books/content/images/frontcover/mggWDAEACAAJ?fife=w80-h100)
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Languages : en
Pages : 4
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