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Search For Lepton Flavour Violating Decays Tau To L Ks With The Babar Experiment
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Book Synopsis Search for Lepton Flavour Violating Decays Tau- to L- Ks with the BaBar Experiment by :
Download or read book Search for Lepton Flavour Violating Decays Tau- to L- Ks with the BaBar Experiment written by and published by . This book was released on 2009 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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}°)
Book Synopsis Search for Lepton Flavour Violating Decays Tau -] L Ks with the BABAR Detector by :
Download or read book Search for Lepton Flavour Violating Decays Tau -] L Ks with the BABAR Detector written by and published by . This book was released on 2009 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Lepton Flavor Violation in Tau and B Decays at BaBar by :
Download or read book Lepton Flavor Violation in Tau and B Decays at BaBar written by and published by . This book was released on 2008 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: This article summarizes the search for lepton flavor violating [tau] and B decays, using data collected by the BABAR detector at the PEP-II asymmetric-energy B factory.
Book Synopsis Search for Lepton Flavour Violation (LFV) in Three-Body Tau Decays at BaBar by :
Download or read book Search for Lepton Flavour Violation (LFV) in Three-Body Tau Decays at BaBar written by and published by . This book was released on 2005 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of searches for Lepton Flavour Violating (LFV) decays at the BaBar detector located on the PEP-II collider, using data collected at an ee− energy of 10.58 GeV, are presented. Upper limits at 90% Confidence Level (CL) are established in the range 1-3 x 10−7 for six [tau] 2!lll modes using 91.5 fb−1 of data and in the range 0.7-4.8 x 10−7 for fourteen [tau] 2!lhh modes using 221.4 fb−1 of data. The [tau] 2!lhh results are preliminary.
Book Synopsis A Search for Lepton Flavor Violation in Tau Decays at BABAR. by :
Download or read book A Search for Lepton Flavor Violation in Tau Decays at BABAR. written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Lepton Flavour Violating Decays ? {u2192} L K0s with the BABAR Detector by :
Download or read book Search for Lepton Flavour Violating Decays ? {u2192} L K0s with the BABAR Detector written by and published by . This book was released on 2009 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the search for the lepton flavour violating decay ???????? lK0s with the BaBar experiment data. This process and many other lepton flavour violating ? decays, like ???????? ?? and ???????? 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 ? 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 ? decays. The tracking system, the calorimeter and the particle identification of BABAR, together with the knowledge of the ? initial energy, allow an extremely powerful rejection of background events that, for this analysis, is better than 10-9. Being ????????lK0s a decay mode without neutrinos, the signal ? 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 ? decays makes the building of such a machine highly desirable.
Book Synopsis Search for Lepton Flavor Violating Decays Tau to L \omega (l by :
Download or read book Search for Lepton Flavor Violating Decays Tau to L \omega (l written by and published by . This book was released on 2007 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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])
Book Synopsis Search for Lepton Flavor Violating Decay $\tau^- \to \ell^- \ell^ \ell^-$ at BaBar by :
Download or read book Search for Lepton Flavor Violating Decay $\tau^- \to \ell^- \ell^ \ell^-$ at BaBar written by and published by . This book was released on 2010 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Search for the Lepton Flavour Violating Decay Tau-]e Gamma by :
Download or read book Search for the Lepton Flavour Violating Decay Tau-]e Gamma written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search is done on the entire BaBar data set for the neutrino-less tau decay tau->e gamma. No evidence for the decay is found and a 90% confidence level upper limit is determined to be 3.3 * 10^( -8) including systematic uncertainty. This measurement is a factor of three improvement from the previous best result from BaBar.
Book Synopsis Lepton-Flavor-Violating Tau Decays at BaBar by :
Download or read book Lepton-Flavor-Violating Tau Decays at BaBar written by and published by . This book was released on 2012 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the most recent searches for lepton-flavor-violating (LFV)? decays in BABAR. We find no evidence of? decaying to three charged leptons or to a charged lepton and a neutral meson (K{sub S}°,?,?, K*°, {bar K}*°), and set upper limits on the corresponding branching fractions (BF) between 1.8 and 19 x 10−8 at 90% confidence level (CL).
Book Synopsis Search for Lepton Flavor Violating Decays $\tau^\pm \to \ell^\pm{\pi^0}, \ell^\pm\eta, \ell^\pm{\eta^\prime}$ by :
Download or read book Search for Lepton Flavor Violating Decays $\tau^\pm \to \ell^\pm{\pi^0}, \ell^\pm\eta, \ell^\pm{\eta^\prime}$ written by and published by . This book was released on 2006 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Search for the Lepton Flavour Violating Decay Tau-]e Gamma by : Clayton Daniel Lindsay
Download or read book Search for the Lepton Flavour Violating Decay Tau-]e Gamma written by Clayton Daniel Lindsay and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search is done on the entire BaBar data set for the neutrino-less tau decay tau->e gamma. No evidence for the decay is found and a 90% confidence level upper limit is determined to be 3.3 * 10^( -8) including systematic uncertainty. This measurement is a factor of three improvement from the previous best result from BaBar.
Book Synopsis A Search for Lepton Flavor Violation in Tau Decays at BABAR. by : O. Igonkina
Download or read book A Search for Lepton Flavor Violation in Tau Decays at BABAR. written by O. Igonkina and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a recent BABAR search for lepton flavor violation in tau decays. The search for {tau} {yields} {ell}{ell}{ell} ({ell} = e, {mu}) decays is based on a data sample of 91.6 fb{sup -1}. No signal is found in any of six channels and 90% CL upper limits are set in the range of (1-3) x 10{sup -7}. The search for {tau} {yields} {mu}{gamma} decay is done with a 63 fb{sup -1} data sample. The number of observed events is consistent with expected background level and a preliminary upper limit is set at 2 x 10{sup -6} at 90% CL.
Book Synopsis Search for Lepton Flavor Violation in the Decays Tau-]e Gamma and Tau-]mu Gamma by :
Download or read book Search for Lepton Flavor Violation in the Decays Tau-]e Gamma and Tau-]mu Gamma written by and published by . This book was released on 2010 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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])
Book Synopsis Search for Lepton Flavour Violation in the Decay Tau +/- to Mu +/- Gamma by : M. Roney
Download or read book Search for Lepton Flavour Violation in the Decay Tau +/- to Mu +/- Gamma written by M. Roney and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for the lepton flavour violating decay {tau}{sup {+-}} {yields} {mu}{sup {+-}}{gamma} has been performed using 221.4 fb{sup -1} of data collected at an e{sup +}e{sup -} centre-of-mass energy of 10.58 GeV with the BABAR detector at the PEP-II storage ring. The search has an efficiency of 7.45 {+-} 0.65% for an expected background level of 6.2 {+-} 0.5 events. In the final sample 4 candidate events are selected. As there is no evidence for a signal in this data, for this preliminary result we set an upper limit of {Beta}({tau}{sup {+-}} {yields} {mu}{sup {+-}}{gamma})
Book Synopsis Search for the Lepton Flavor Violating Decay [tau] L [Kappa] 0 by : BELLE
Download or read book Search for the Lepton Flavor Violating Decay [tau] L [Kappa] 0 written by BELLE and published by . This book was released on 2000 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Lepton Flavour Violation in Tau Decays at BaBar by :
Download or read book Lepton Flavour Violation in Tau Decays at BaBar written by and published by . This book was released on 2011 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent results from [tau] physics studies at BABAR are presented with an emphasis on Lepton Flavour Violation measurements. The results from the current generation of B-meson Factories are already beginning to constrain the parameter space of models that go beyond the Standard Model. By the end of their data-taking, the current generation of B-meson factories will have produced nearly 2 billion [tau] pair decays. The physics potential of this legacy has only just begun to be exploited.
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