Measurement of Branching Ratio and B0s Lifetime in the Decay B0s 2!J/[psi] F0(980) at CDF. PDF Download
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![Measurement of Branching Ratio and B0s Lifetime in the Decay B0s 2!J/[psi] F0(980) at CDF. PDF](https://books.google.com/books/content/images/frontcover/eRymAQAACAAJ?fife=w150-h200)
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Languages : en
Pages : 14
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We present a study of Bs0 decays to the CP-odd final state J/[psi] f0(980) with J/[psi] 2!æ+æ- and f0(980) 2![pi]+[pi]-. Using pp̄ collision data with an integrated luminosity of 3.8 fb-1 collected by the CDF II detector at the Tevatron we measure a Bs0 lifetime of [tau](B0s 2!J/[psi] f0(980)) = 1.70-0.11+0.12(stat) " 0.03(syst) ps. This is the first measurement of the Bs0} lifetime in a decay to a CP eigenstate and corresponds in the standard model to the lifetime of the heavy Bs0 eigenstate. We also measure the product of branching fractions of B0s 2!J/[psi] f0(980) and f0(980) 2![pi]+[pi]- relative to the product of branching fractions of B0s 2!J/[psi][phi] and [phi]2!+K- to be Rf0/[psi] = 0.257 " 0.020(stat) " 0.014(syst), which is the most precise determination of this quantity to date.
![Measurement of Branching Ratio and B0s Lifetime in the Decay B0s 2!J/[psi] F0(980) at CDF. PDF](https://books.google.com/books/content/images/frontcover/eRymAQAACAAJ?fife=w80-h100)
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Languages : en
Pages : 14
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We present a study of Bs0 decays to the CP-odd final state J/[psi] f0(980) with J/[psi] 2!æ+æ- and f0(980) 2![pi]+[pi]-. Using pp̄ collision data with an integrated luminosity of 3.8 fb-1 collected by the CDF II detector at the Tevatron we measure a Bs0 lifetime of [tau](B0s 2!J/[psi] f0(980)) = 1.70-0.11+0.12(stat) " 0.03(syst) ps. This is the first measurement of the Bs0} lifetime in a decay to a CP eigenstate and corresponds in the standard model to the lifetime of the heavy Bs0 eigenstate. We also measure the product of branching fractions of B0s 2!J/[psi] f0(980) and f0(980) 2![pi]+[pi]- relative to the product of branching fractions of B0s 2!J/[psi][phi] and [phi]2!+K- to be Rf0/[psi] = 0.257 " 0.020(stat) " 0.014(syst), which is the most precise determination of this quantity to date.
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Languages : en
Pages : 14
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We present a study of B{sub s}° decays to the CP-odd final state J/? f0(980) with J/? →??− and f0(980) →?+?−. Using p{bar p} collision data with an integrated luminosity of 3.8 fb−1 collected by the CDF II detector at the Tevatron we measure a B{sub s}° lifetime of? (B{sub s}° → J/? f0(980)) = 1.70{sub -0.11}{sup +0.12}(stat) ± 0.03(syst) ps. This is the first measurement of the B{sub s}° lifetime in a decay to a CP eigenstate and corresponds in the standard model to the lifetime of the heavy B{sub s}° eigenstate. We also measure the product of branching fractions of B{sub s}° → J/? f0(980) and f0(980) →?+?− relative to the product of branching fractions of B{sub s}° → J/?? and? → K+K− to be R{sub f{sub 0}/?} = 0.257 ± 0.020(stat) ± 0.014(syst), which is the most precise determination of this quantity to date.
![Measurement of Lifetime and Decay-Width Difference in B0s -] J/psi Phi Decays PDF](https://books.google.com/books/content/images/frontcover/_GlXAQAACAAJ?fife=w80-h100)
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Languages : en
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The authors measure the mean lifetime, [tau] = 2/([Lambda]{sub L} + [Lambda]{sub H}), and the decay-width difference, [Delta][Lambda] = [Lambda]{sub L} - [Lambda]{sub H}, of the light and heavy mass eigenstates of the B{sub s}° meson, B{sub sL}° and B{sub sH}°, in B{sub s}° → J/[psi][phi] decays using 1.7 fb−1 of data collected with the CDF II detector at the Fermilab Tevatron p{bar p} collider. Assuming CP conservation, a good approximation for the B{sub s}° system in the standard model, they obtain [Delta][Lambda] = 0.076{sub -0.063}{sup +0.059}(stat.) ± 0.006(syst.) ps−1 and [tau] = 1.52 ± 0.04(stat.) ± 0.02(syst.) ps, the most precise measurements to date. The constraints on the weak phase and [Delta][Lambda] are consistent with CP conservation.
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Languages : en
Pages : 142
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This thesis reports on a measurement of the branching ratio of the Cabibbo-suppressed decay B$+\atop{u}$ 2!J/[Psi][pi]+, where J/[Psi] 2![mu]+[mu]-
![Measurement of the Average B [0 S] Lifetime in the Decay B [0 S] [arrow] J/ [small Psi] [small Phi] PDF](https://books.google.com/books/content/images/frontcover/FCutGwAACAAJ?fife=w80-h100)
Author: Thilo Pauly
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Category : B mesons
Languages : en
Pages : 306
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![Measurement of the Branching Ratio of the Charmless Decay Bs 2![phi][phi] at CDFII. PDF](https://books.google.com/books/content/images/frontcover/0fzwswEACAAJ?fife=w80-h100)
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Languages : en
Pages : 116
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We present a study of the charmless Bs → [phi][phi] decay performed with the CDFII detector at the Fermilab Tevatron Collider. Charmless B0 decays currently can be studied only at the Tevatron and represent a field still to be fully explored that offers additional ways to test our present theoretical understanding. The Bs → [phi][phi] belongs to a particular class of these decays: the Bs meson decays into a pair of vector particle and the fi al state is self- conjugate. It can be used to measure the Bs decay width difference ([Gamma][Delta]s), to improve our understanding about the Cabibbo Kobayashi Maskawa matrix, and to perform tests of decay polarization predictions. The Bs → [phi][phi] decay proceeds through a b → sss transition and in the Standard Model the dominant process is the b → s "penguin" diagram. The same penguin amplitude is involved in several processes which have shown several discrepancies with the Standard Model predictions, raising considerable attention on the theoretical side and new physics interpretations have been considered to explain the experimental data. To shed light on this experimental and theoretical rather complex scenario, new and more precise measurements are clearly needed in as many interesting channels as possible. The study of Bs → [phi][phi] channel is an important player in this experimental effort. The Bs → [phi][phi] decay has been observed for the first time by CDF in 2005 [1] in a data sample of 180 pb-1; eight events have been seen and a first measurement of the Branching Ratio (BR) has been performed. In this thesis we present an update of this measurement with an integrated luminosity of 2.9fb-1. An improvement of a factor 5 compared to the previous Branching Ratio measurement is achieved. In Chap.2 a short introduction on the Standard Model with special emphasis on the electroweak sector is presented. In Chap.3 the Fermilab accelerator complex and the CDFII detector is described. The trigger strategy to select events relevant to B physics is explained in some detail. In Chap.4 we present the data sample used for this analysis and some informations concerning the offline reconstruction program. In Chap.5 the Monte Carlo program and its validation procedure are explained. In Chap.6 the strategy of the Branching Ratio measurement and the optimization procedure used to define the analysis selection criteria both for the Bs → [phi][phi] and the Bs → J/[psi][phi] decays are presented. In Chap.7 all the steps needed to perform the measurement of the BR are reported. Signal yields of the Bs → [phi][phi] and the Bs → J/[psi][phi] decays are presented. The trigger and selection efficiencies and the muon efficiency are evaluated. The ratio of the BR(Bs → [phi][phi]) to the BR(Bs → J/[psi][phi]) is measured and is used to compute the Branching Ratio of Bs → [phi][phi]. The systematic errors on the BR are estimated. In Chap.8 we present the summary of our results.
![Measurement of the Branching Ratios Psi-prime ---] E+ E-, Psi-prime ---] J/psi Pi Pi and Psi-prime ---] J/psi Eta PDF](https://books.google.com/books/content/images/frontcover/WNnQwQEACAAJ?fife=w80-h100)
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Languages : en
Pages : 8
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The authors have measured several branching ratios for?' decay using the data collected by FNAL E835 experiment during year 2000, obtaining?(?' 2!ee−) = 0.0068 ± 0.0001 ± 0.0004,?(?' 2!J/??+?−) = 0.292 ± 0.005 ± 0.018,?(?' 2!J/??°?°) = 0.167 ± 0.005 ± 0.014 and?(?' 2!J/??) = 0.028 ± 0.002 ± 0.002. They also present a measurement of the dipion mass distribution in the decays?' 2!J/???
Author: Dominik Horn
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Category :
Languages : en
Pages :
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Author: C. M. Turner
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Category : Beryllium
Languages : en
Pages : 6
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![Lifetime of the 2[sup 2][sub 1 PDF](https://books.google.com/books/content/images/frontcover/vF5FnQAACAAJ?fife=w80-h100)
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Languages : en
Pages : 5
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We report a measurement of the lifetime of 2[sup 2]S[sub [1/2]] level in hydrogenlike [sup 84]Kr and the first determination of the branching ratio for the M decay for this Z=36 one-electron ion. The lifetime of this state was measured by the beam-foil time-of-flight method, in which the foil was moved relative to a fixed, collimated Si(Li) detector. An analysis based on the single photon spectra from a tightly collimated detector led to the measurements of the lifetime of 2[sup 2]S[sub [1/2]], the two-photon emission rate, the M emission rate and the branching ratio of M decay. All these experimental results are in good agreement with the theoretical calculations of Parpia and Johnson, and Goldman and Drake.
