Measurement Of Branching Ratio And B0s Lifetime In The Decay B0s 2 J Psi F0 980 At Cdf

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Measurement Of Branching Ratio And B0s Lifetime In The Decay B0s 2 J Psi F0 980 At Cdf

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Author :
language : en
Publisher:
Release Date : 2011

Measurement Of Branching Ratio And B0s Lifetime In The Decay B0s 2 J Psi F0 980 At Cdf written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.

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 B S0 Lifetime In The Decay B S0 Rightarrow J Psi F 0 980 At Cdf

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language : en
Publisher:
Release Date : 2011

Measurement Of Branching Ratio And B S0 Lifetime In The Decay B S0 Rightarrow J Psi F 0 980 At Cdf written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.

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

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Author :
language : en
Publisher:
Release Date : 2007

Measurement Of Lifetime And Decay Width Difference In B0s J Psi Phi Decays written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.

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.

Measurement Of The Branching Ratio Of The Charmless Decay Bs 2 Phi Phi At Cdfii

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Author :
language : en
Publisher:
Release Date : 2008

Measurement Of The Branching Ratio Of The Charmless Decay Bs 2 Phi Phi At Cdfii written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.

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 Ratio Of Branching Ratios B B To J Psi Pi

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Author :
language : en
Publisher:
Release Date : 1996

Measurement Of The Ratio Of Branching Ratios B B To J Psi Pi written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.

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]-

Fully Reconstructed B Decay Results From Cdf

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Author :
language : en
Publisher:
Release Date : 2001

Fully Reconstructed B Decay Results From Cdf written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.

We have measured ratios of branching ratios of[ital B] mesons including charmonium in the final state and use these ratios to derive[ital B] meson branching fractions. Results are also compared to predictions of factorization. We have searched for[ital B][sup+][sub[ital c]][yields][ital J]/[Psi][pi][sup+] and set a limit on[delta][center-dot][ital B]. We observe[Lambda][sub[ital b]][yields][ital J]/[Psi][Lambda] and measure the mass[ital M]([Lambda][sub[ital b]])= 5.623[+-] 0.005[+-] 0.004 GeV/c[sup 2].

Measurement Of The B D0 Lifetime Using B D0 To J Psi K0 S Decays At Dzero

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Author : Paul W. Balm
language : en
Publisher:
Release Date : 2004

Measurement Of The B D0 Lifetime Using B D0 To J Psi K0 S Decays At Dzero written by Paul W. Balm and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.

This thesis describes a measurement of the B{sub d}{sup 0} lifetime in the decay to (J/{psi}K{sub S}{sup 0}), using 114 pb{sup -1} of data collected by the D0 experiment at the Tevatron from October 15, 2002, to June 10, 2003. The measurement is motivated by the tests of the Standard Model that it makes possible. These include tests of Heavy Quark Effective Theory predicting B-meson lifetimes, and of the complex phase in the CKM-matrix as the source of CP-violation in B{sub d}{sup 0} decays to (J/{psi}K{sub S}{sup 0}).

Fully Reconstructed B Meson Decays Using J Psi And Psi 2s

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Author :
language : en
Publisher:
Release Date : 2001

Fully Reconstructed B Meson Decays Using J Psi And Psi 2s written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.

In this paper we present CDF B-meson branching ratio results involving color-suppressed[ital B][r-arrow][Psi][Kappa] decays, where[Psi]=[ital J]/[psi], [psi](2[ital S]) and[Kappa]=[Kappa], [Kappa][sup*]. Fully reconstructed decays of[ital B][r-arrow][ital J]/[psi][Kappa], [ital B][r-arrow][psi](2[ital S])[Kappa], [ital B][sup+][r-arrow][ital J]/[psi][pi][sup+] and[ital B][sub s][r-arrow][ital J]/[psi][phi] are used to extract branching ratios, vector-pseudoscalar ratios and polarization parameters.

Measurement Of The Branching Ratios For The Decays J Psi 3 1 F Omega And J Psi 3 1 B Pi

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Author : J. Burmester
language : en
Publisher:
Release Date : 1977

Measurement Of The Branching Ratios For The Decays J Psi 3 1 F Omega And J Psi 3 1 B Pi written by J. Burmester and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with categories.

Measurement Of The Lifetime Of The B0s Meson Using The Exclusive Decay Mode B0s J Psi Phi

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Author : Farrukh Azfar
language : en
Publisher:
Release Date : 1995

Measurement Of The Lifetime Of The B0s Meson Using The Exclusive Decay Mode B0s J Psi Phi written by Farrukh Azfar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.