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Measurement Of The Bar B Lifetime And Of The B Bar B Oscillation Frequency Using Partially Reconstructed Bar B D L Anti Nusub L Decays
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Book Synopsis Measurement of the {bar B}° Lifetime and of the B°-{bar B}° Oscillation Frequency Using Partially Reconstructed {bar B}° --] D* L− {anti {nu}}{sub L} Decays by :
Download or read book Measurement of the {bar B}° Lifetime and of the B°-{bar B}° Oscillation Frequency Using Partially Reconstructed {bar B}° --] D* L− {anti {nu}}{sub L} Decays written by and published by . This book was released on 2004 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a simultaneous measurement of the {bar B}° lifetime [tau](B°) and mixing parameter [Delta]m{sub d}. They use a sample of about 50000 {bar B}° --> D* 1 {anti {nu}}(l) partially reconstructed decays identified with the BABAR detector at the PEP-II storage ring at SLAC, where the flavor of the other B meson is determined from the charge of another high momentum lepton in the same event. The preliminary results are: tau(B°) = (1.50 ± 0.008(stat.) ± 0.030(syst.)) ps, [Delta]m{sub d} = (0.523 ± 0.004(stat.) ± 0.007(syst.)) p{sup s}( -1).
Book Synopsis Measurement of the B0-bar Lifetime and the B0B0-bar Oscillation Frequency Using Partially Reconstructed B0-bar to D*+ L- Nu-bar Decays by :
Download or read book Measurement of the B0-bar Lifetime and the B0B0-bar Oscillation Frequency Using Partially Reconstructed B0-bar to D*+ L- Nu-bar Decays written by and published by . This book was released on 2005 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a simultaneous measurement of the {bar B}° lifetime [tau]{sub B°} and B°{bar B}° oscillation frequency [Delta]m{sub d}. We use a sample of about 50,000 partially reconstructed {bar B}{sup 0} 2!D*l−{bar {nu}}{sub {ell}} decays identified with the BABAR detector at the PEP-II ee− storage ring at SLAC. The flavor of the other B meson in the event is determined from the charge of another high-momentum lepton.
Book Synopsis Measurement of the B0 Lifetime and Oscillation Frequency Using Partially Reconstructed B0 D-l+vl Decays by : Marcello Rotondo
Download or read book Measurement of the B0 Lifetime and Oscillation Frequency Using Partially Reconstructed B0 D-l+vl Decays written by Marcello Rotondo and published by . This book was released on 2001 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Simultaneous Measurement of the B0 Meson Lifetime and Mixing Frequency with B0 -] D*- L+ NU{sub L} Decays by :
Download or read book Simultaneous Measurement of the B0 Meson Lifetime and Mixing Frequency with B0 -] D*- L+ NU{sub L} Decays written by and published by . This book was released on 2002 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: We measure the B° lifetime [tau]{sub B°} and the B°-{bar B}° oscillation frequency [Delta]m{sub d} with a sample of approximately 14,000 exclusively reconstructed B{sup 0} 2!D*− l [nu]{sub {ell}} signal events, selected from 23 million B{bar B} pairs recorded at the [Upsilon](4S) resonance with the BABAR detector at the Stanford Linear Accelerator Center. The b-quark .avor of the other B at the time of decay and its decay position are determined inclusively. The lifetime and oscillation frequency are measured simultaneously with an unbinned maximum-likelihood fit that uses, for each event, the measured difference in B decay times ([Delta]t), the calculated uncertainty on [Delta]t, the signal and background probabilities, and b-quark tagging information for the other B. The preliminary results are [tau]{sub B{sup 0}} = (1.523{sub -0.023}{sup +0.024} ± 0.022) ps and [Delta]m{sub d} = (0.492 ± 0.018 ± 0.013) ps−1. The statistical correlation coefficient between [tau]{sub B{sup 0}} and [Delta]m{sub d} is -0.22.
Book Synopsis Simultaneous Measurement of the B0 Meson Lifetime and Mixing Frequency with B0 --] D*- 1+ Nu Decays by :
Download or read book Simultaneous Measurement of the B0 Meson Lifetime and Mixing Frequency with B0 --] D*- 1+ Nu Decays written by and published by . This book was released on 2002 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: We measure the B° lifetime [tau]{sub b°} and the B°-{bar B}° oscillation frequency [Delta]m{sub d} with a sample of approximately 14,000 exclusively reconstructed B{sup 0} 2!D*− l [nu]{sub {ell}} signal events, selected from 23 million B{bar B} pairs recorded at the [Upsilon](4S) resonance with the BABAR detector at the Stanford Linear Accelerator Center. The decay position of the other B is determined with the remaining tracks in the event, and its b-quark flavor at the time of decay is determined with a tagging algorithm that exploits the correlation between the flavor of the b-quark and the charges of its decay products. The lifetime and oscillation frequency are measured simultaneously with an unbinned maximum-likelihood ([Delta]t) that uses, for each event, the measured difference in decay times of the two B mesons ([Delta]t), the calculated uncertainty on [Delta]t, the signal and background probabilities, and b-quark tagging information for the other B. The results are [tau]{sub B{sup 0}} = (1.523{sub -0.023}{sup +0.024} ± 0.022) ps and [Delta]m{sub d} = (0.492 ± 0.018 ± 0.013) ps−1.
Book Synopsis Relación de la jornada que hizo el Condestable de Castilla, Don Juan Fernández de Velasco, desde Valadolid a Inglaterra, con embajada de S.M. Felipe III, 1603 by :
Download or read book Relación de la jornada que hizo el Condestable de Castilla, Don Juan Fernández de Velasco, desde Valadolid a Inglaterra, con embajada de S.M. Felipe III, 1603 written by and published by . This book was released on 1603 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the B0-anti-B0 Oscillation Frequency with Inclusive Dilepton Events by :
Download or read book Measurement of the B0-anti-B0 Oscillation Frequency with Inclusive Dilepton Events written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The B[sup 0]-[bar B][sup 0] oscillation frequency has been measured with a sample of 23 million B[bar B] pairs collected with the BABAR detector at the PEP-II asymmetric B Factory at SLAC. In this sample, we select events in which both B mesons decay semileptonically and use the charge of the leptons to identify the flavor of each B meson. A simultaneous fit to the decay time difference distributions for opposite- and same-sign dilepton events gives[Delta]m[sub d]= 0.493[+-] 0.012 (stat)[+-] 0.009 (syst) ps[sup -1].
Book Synopsis Time Dependent B{sub S}° - {bar B}{sub S}° Oscillations Using Exclusively Reconstructed D{sub S} Decays at SLD. by :
Download or read book Time Dependent B{sub S}° - {bar B}{sub S}° Oscillations Using Exclusively Reconstructed D{sub S} Decays at SLD. written by and published by . This book was released on 2000 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We set a preliminary 95% C.L. exclusion on the oscillation frequency of B{sub s}° - {bar B}{sub s}° mixing using a sample of 400,000 hadronic Z° decays collected by the SLD experiment at the SLC during the 1996-98 run. In this analysis, B{sub s}° mesons are partially reconstructed by combining a fully reconstructed D{sub s} with other B{sub s}° decay tracks. The D{sub s} decays are reconstructed via the [phi][pi] and K*K channels. The b-hadron flavor at production is determined by exploiting the large forward-backward asymmetry of polarized Z° 2!b{bar b} decays as well as information from the hemisphere opposite to the reconstructed B decay. The flavor of the B{sub s}° at the decay vertex is determined by the charge of the D{sub s}. A total of 361 candidates passed the final event selection cuts. This analysis excludes the following values of the B{sub s}°-{bar B}{sub s}° mixing oscillation frequency: [Delta]m{sub s}
Book Synopsis Measurement of the Time Dependence of B0-B0(bar) Oscillations Using Inclusive Dilepton Events by :
Download or read book Measurement of the Time Dependence of B0-B0(bar) Oscillations Using Inclusive Dilepton Events written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A preliminary study of time dependence of B[sup 0][bar B][sup 0] oscillations using dilepton events is presented. The flavor of the B meson is determined by the charge sign of the lepton. To separate signal leptons from cascade and fake leptons we have used a method which combines several discriminating variables in a neural network. The time evolution of the oscillations is studied by reconstructing the time difference between the decays of the B mesons produced by the[Upsilon](4S) decay. With an integrated luminosity of 7.7 fb[sup -1] collected on resonance by BABAR at the PEP-II asymmetric B Factory, we measure the difference in mass of the neutral B eigenstates, [Delta]m[sub B[sup 0]], to be (0.507[+-] 0.015[+-] 0.022) x 10[sup 12][Dirac-h] s[sup -1].
Book Synopsis A Study of B° {bar B}° Oscillations with Fully Reconstructed B Mesons with the BaBar Detector by :
Download or read book A Study of B° {bar B}° Oscillations with Fully Reconstructed B Mesons with the BaBar Detector written by and published by . This book was released on 2000 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of B[sup 0][bar B][sup 0] Oscillations with Fully Reconstructed B Mesons with the BaBar Detector by :
Download or read book A Study of B[sup 0][bar B][sup 0] Oscillations with Fully Reconstructed B Mesons with the BaBar Detector written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Time-dependent B[sup 0][bar B][sup 0] flavor oscillations are studied in e[sup+]e[sup -] annihilation data collected with the BABAR detector at center-of-mass energies near the[Upsilon](4S) resonance. We report a preliminary result for the time-dependent B[sup 0][bar B][sup 0] oscillation frequency, [Delta]m[sub d]= 0.512[+-] 0.017[+-] 0.022[Dirac-h] ps[sup -1].
Book Synopsis Measurements of B0 and B+- Lifetimes and B0-anti-B0 Mixing with Fully Reconstructed B Decays in BABAR. by :
Download or read book Measurements of B0 and B+- Lifetimes and B0-anti-B0 Mixing with Fully Reconstructed B Decays in BABAR. written by and published by . This book was released on 2000 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Time-dependent B°{bar B}° flavor oscillations and B° and B lifetimes are studied in a sample of fully reconstructed B mesons collected with the BABAR detector, running at the PEP-II asymmetric ee− B Factory with center-of-mass energies near the [Upsilon](4S) resonance. This is the first time that time-dependent mixing and lifetime measurements have been performed at [Upsilon](4S) energies.
Book Synopsis Measurement of the {bar B} 2!Dl{bar {nu}} Anti-Neutrino Partial Width and Form Factor Parameters by :
Download or read book Measurement of the {bar B} 2!Dl{bar {nu}} Anti-Neutrino Partial Width and Form Factor Parameters written by and published by . This book was released on 2003 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have studied the decay {bar B} → Dl{bar {nu}}, where l = e or [mu]. From a fit to the differential decay rate d[Lambda]/dw we measure the rate normalization F{sub D}(1).
Book Synopsis Measurement of the Branching Fractions of Bbar -] D** L^- Nubar_l Decays in Events Tagged by a Fully Reconstructed B Meson by :
Download or read book Measurement of the Branching Fractions of Bbar -] D** L^- Nubar_l Decays in Events Tagged by a Fully Reconstructed B Meson written by and published by . This book was released on 2008 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report a measurement of the branching fractions of {bar B} 2!D** l−{bar {nu}}{sub l} decays based on 417 fb−1 of data collected at the [Upsilon](4S) resonance with the BABAR detector at the PEP-II ee− storage rings. Events are selected by fully reconstructing one of the B mesons in a hadronic decay mode. A fit to the invariant mass differences m(D{sup (*)})-m(D{sup (*)}) is performed to extract the signal yields of the different D** states. We observe the {bar B} 2!D**{ell}−{bar {nu}}{sub {ell}} decay modes corresponding to the four D** states predicted by Heavy Quark Symmetry with a significance greater than six standard deviations including systematic uncertainties.
Book Synopsis A Preliminary Measurement of the Average B Hadron Lifetime by :
Download or read book A Preliminary Measurement of the Average B Hadron Lifetime written by and published by . This book was released on 1994 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The average B hadron lifetime was measured using data collected with the SLD detector at the SLC in 1993. From a sample of -50,000 Z° events, a sample enriched in Z° → b{bar b} was selected by applying an impact parameter tag. The lifetime was extracted from the decay length distribution of inclusive vertices reconstructed in three dimensions. A binned maximum likelihood method yielded an average B hadron lifetime of?{sub B} = 1.577±0.032(stat.)±0.046(syst.) ps.
Book Synopsis Time Dependent B{sub S}°-{bar B}{sub S}° Mixing Using Inclusive and Semileptonic B Decays at SLD. by :
Download or read book Time Dependent B{sub S}°-{bar B}{sub S}° Mixing Using Inclusive and Semileptonic B Decays at SLD. written by and published by . This book was released on 1999 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: We set a preliminary 95% C.L. exclusion on the oscillation frequency of B{sub s}°-{bar B}{sub s}° mixing using a sample of 350,000 hadronic Z° decays collected by the SLD experiment at the SLC during the 1997-98 run. The analyses determine the b-hadron flavor at production by exploiting the large forward-backward asymmetry of polarized Z° 2!b{bar b} decays as well as information from the hemisphere opposite that of the reconstructed B decay. In one analysis, B decay vertices are reconstructed inclusively with a new topological technique, and separation between B{sub s}° and {bar B}{sub s}° decays exploits the B{sub s}° 2!D{sub s}− cascade charge structure. In the other analysis, semileptonic decays are selected and the B decay point is reconstructed by intersecting a lepton track with the trajectory of a topologically reconstructed D meson. The two analyses are combined with a third analysis described elsewhere to exclude the following values of the B{sub s}°-{bar B}{sub s}° mixing oscillation frequency: [Delta]m{sub s}
Download or read book Bs Mixing at SLD. written by and published by . This book was released on 2000 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We set a preliminary 95% C.L. exclusion on the oscillation frequency of B{sub s}° - {bar B}{sub s}° mixing using a sample of 400,000 hadronic Z° decays collected by the SLD experiment at the SLC during the 1996-98 run. Three analyses are presented in this paper. The first analysis partially reconstructs the B{sub s}° by combining a fully reconstructed D{sub s} with the remaining charged B decay tracks. The second analysis selects a sample of events with a partially reconstructed charm vertex and a lepton track. The third analysis reconstructs b-hadrons topologically and exploits the b 2!c cascade charge structure to determine the flavor of the b-hadron at decay. All three analyses take advantage of the large forward-backward asymmetry of the polarized Z° 2!b{bar b} decays and information in the hemisphere opposite to the reconstructed B vertex to determine the b-hadron flavor at production. The results of the three analyses are combined to exclude the following values of the B{sub s}° - {bar B}{sub s}° oscillation frequency: [Delta]m{sub s}
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