A Search for the Rare Decay B0 (arrow Tau Tau−) at the Babar Experiment PDF Download
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Author: Christopher Thomas Potter
Publisher:
ISBN:
Category : Mesons
Languages : en
Pages : 446
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Book Description
Author: Christopher Thomas Potter
Publisher:
ISBN:
Category : Mesons
Languages : en
Pages : 446
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Book Description
![A Search for the Rare Decay B-]tau+tau- at the BaBar Experiment PDF](https://books.google.com/books/content/images/frontcover/LcfQjwEACAAJ?fife=w80-h100)
Author: Christopher Thomas Potter
Publisher:
ISBN:
Category :
Languages : en
Pages : 223
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Book Description
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.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 167
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Author: Sheila McLachlin
Publisher:
ISBN:
Category :
Languages : en
Pages :
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![Search for the Rare Decay B0 - J/[psi]/[gamma] in the BABAR Experiment PDF](https://books.google.com/books/content/images/frontcover/Lo0xQwAACAAJ?fife=w80-h100)
Author: Sheila McLachlin
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: J. C. Chen
Publisher:
ISBN:
Category :
Languages : en
Pages : 7
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We present the results of a search for the decay B{sup 0} {yields} {tau}{sup +}{tau}{sup -} in a data sample of (232 {+-} 3) x 10{sup 6} {Upsilon}(4S) {yields} B{bar B} decays using the BABAR detector. Certain extensions of the Standard Model predict measurable levels of this otherwise rare decay. We reconstruct fully one neutral B meson and seek evidence for the signal decay in the rest of the event. We find no evidence for signal events and obtain {Beta}(B{sup 0} {yields} {tau}{sup +}{tau}{sup -})
Author: Racha Cheaib
Publisher:
ISBN:
Category :
Languages : en
Pages :
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"The flavour changing neutral current (FCNC) process , B+ → K+ [tau]+[tau]−, is highly sup-pressed in the Standard Model (SM). This decay is forbidden at tree level and only occursat lowest order via one-loop diagrams. B+ → K+ [tau]+[tau]− thus has the potential to providea stringent test of the SM and a fertile ground for new physics searches. Contributions dueto virtual particles in the loop allow one to probe, at relatively low energies, new physicsat large mass scales. We search for the rare FCNC process B+ → K+ [tau]+[tau]− using datacollected by the BABAR detector at the SLAC National Accelerator Laboratory. The BABARdata sample corresponds to a total integrated luminosity, at the energy of the [UPSILON](4S) reso-nance, of 424.4 fb−1 and 471 million BB pairs. For this search, hadronic Btag reconstructionis employed, where one B is exclusively reconstructed via one of many possible hadronicmodes. The remaining decay products in an event are then attributed to the signal B, onwhich the search for B+ → K+ [tau]+[tau]− is performed. Each [tau] is required to decay leptonically,into either an electron or a muon and the lepton neutrinos. Furthermore, a multi-variateanalysis technique (neural network) is used to select for signal events and suppress dominantbackground modes. No significant signal is observed. The resulting branching fraction ismeasured to be B(B+ → K+[tau]+[tau]−) = 1.310.66 (stat.)+0.35(sys.) × 10−3, which is consistent −0.61 −0.25with zero at the 1.9[sigma] level, with an upper limit of 2.25 ×10−3 at the 90% confidence level." --
![A Search for the Decays B+ Arrow] L+nu and B[degree]arrow L+ Tau- (l PDF](https://books.google.com/books/content/images/frontcover/js20oQEACAAJ?fife=w80-h100)
Author: Miika A. Klemetti
Publisher:
ISBN:
Category :
Languages : en
Pages :
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"We present searches for the leptonic decays B + [arrow] l+nu and the lepton flavor violating decays B[degree][arrow] l[symbol][tau][symbol], where l = e, [mu], with data collected by the BABAR experiment at SLAC. These searches utilize a technique in which we fully reconstruct the accompanying B̄ in [Upsilon](4S)[arrow] BB̄ events, and look for a monoenergetic lepton in the signal B frame. The signal yield in the data is extracted from a fit to the signal lepton candidate momentum distribution in the signal B rest frame. Using a data sample of approximately 378 million BB̄ pairs (342 fb-1), we find no evidence of signal in any of the decay modes. Branching fraction upper limits of B (B+[arrow] e +[nu])
![Search for the decay B° -] ηφ at the BABAR experiment PDF](https://books.google.com/books/content/images/frontcover/HXYccgAACAAJ?fife=w80-h100)
Author: Stephan Otto
Publisher:
ISBN:
Category :
Languages : de
Pages :
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Author: S. H. Robertson
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
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Book Description
Results from the BABAR experiment are presented for searches for several rare FCNC B and D meson decays, including the modes B{sup 0} {yields} {ell}{sup +}{ell}{sup -} and D{sup 0} {yields} {ell}{sup +}{ell}{sup -}, B {yields} ({rho}, {omega}){gamma} and B{sup +} {yields} (K, {pi}){sup +}{nu}{bar {nu}}. Limits on lepton flavor violation in neutrino-less {tau} decays are also discussed. Finally, results of BABAR searches for the strange pentaquark states {Theta}{sup +}(1540), {Xi}{sup --}(1860) and {Xi}{sup 0}(1860) are summarized.
