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

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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.

First Evidence For B0 S Phi Phi Decay And Measurements Of Branching Ratio And A Cp For B Phi K

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Author :
language : en
Publisher:
Release Date : 2005

First Evidence For B0 S Phi Phi Decay And Measurements Of Branching Ratio And A Cp For B Phi K written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.

A Branching Ratio Measurement Of The Charmless Hadronic Decay B Superscript Plus Sign Right Hand Arrow P Superscript 0 Pi Sign Superscript Plus Sign P Superscript 0 Right Hand Arrow Pi Sign Superscript Plus Sign Pi Sign Superscript Minus Sign

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language : en
Publisher:
Release Date : 2004

A Branching Ratio Measurement Of The Charmless Hadronic Decay B Superscript Plus Sign Right Hand Arrow P Superscript 0 Pi Sign Superscript Plus Sign P Superscript 0 Right Hand Arrow Pi Sign Superscript Plus Sign Pi Sign Superscript Minus Sign written by 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.

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

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language : en
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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.

Measurements Of Branching Fractions And Cp Asymmetries And Studies Of Angular Distributions For B To Phi Phi K Decays

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Author :
language : en
Publisher:
Release Date : 2011

Measurements Of Branching Fractions And Cp Asymmetries And Studies Of Angular Distributions For B To Phi Phi K 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 2011 with categories.

We present branching fraction and CP asymmetry measurements as well as angular studies of B 2![phi][phi]K decays using 464 x 106 B{bar B} events collected by the BABAR experiment. The branching fractions are measured in the [phi][phi] invariant mass range below the [eta]{sub c} resonance (m{sub [phi][phi]}

Branching Fraction Measurements Of B Eta C K Decays

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language : en
Publisher:
Release Date : 2004

Branching Fraction Measurements Of B Eta C K 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 2004 with categories.

We study the decays B 2![eta]{sub c}K and B° 2![eta]{sub c}K°, where the [eta]{sub c} is reconstructed in the K{sub S}° K{sup ±} [pi]{sup {-+}} and K+K− [pi]° decay modes. Results are based on a sample of 86 million B{bar B} pairs collected with the BABAR detector at the SLAC e+e− B Factory. We measure the branching fractions [Beta](B+ 2![eta]{sub c}K+) = (1.34 ± 0.09 ± 0.13 ± 0.41) x 10−3 and [Beta](B° 2![eta]{sub c}K°) = (1.18 ± 0.16 ± 0.13 ± 0.37) x 10−3, where the first error is statistical, the second is systematic, and the third reflects the [eta]{sub c} branching fraction uncertainty. In addition, we search for B 2![eta]{sub c}K events with [eta]{sub c} 2!2(K+K−) and [eta]{sub c} 2![phi][phi] and determine the [eta]{sub c} decay branching fraction ratios [Beta]([eta]{sub c} 2!2(K+K−))/[Beta]([eta]{sub c} 2!K{bar K}[pi]) = (2.3 ± 0.7 ± 0.6) x 10−2 and [Beta]([eta]{sub c} 2![phi][phi])/[Beta]([eta]{sub c} 2!K{bar K}[pi]) = (5.5 ± 1.4 {+-} 0.5) x 10−2.

Measurements Of Branching Fractions In B 2 Phi K And B 2 Phi Pi And Search For Direct Cp Violation In B Sup 2 Phi K Sup

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Author :
language : en
Publisher:
Release Date : 2003

Measurements Of Branching Fractions In B 2 Phi K And B 2 Phi Pi And Search For Direct Cp Violation In B Sup 2 Phi K Sup written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.

The authors present measurements of branching fractions in the b 2!s{bar s}s penguin-dominated decays B 2![phi]K and B° 2![phi]K° in a sample of approximately 89 million B{bar B} pairs collected by the BABAR detector at the PEP-II asymmetric-energy B-meson Factory at SLAC. They determine [Beta](B+ 2![phi]K+) = (10.0{sub -0.8}{sup +0.9} ± 0.5) x 10−6 and [Beta](B° 2![phi]K°) = (8.4{sub -1.3}{sup +1.5} ± 0.5) x 10−6. Additionally, they measure the CP-violating charge asymmetry [Alpha]{sub CP}(B{sup ±} 2![phi]K{sup ±}) = 0.04 {+-} 0.09 {+-} 0.01, with a 90% confidence-level interval of [-0.10, 0.18], and set an upper limit on the CKM- and color-suppressed decay B+ 2![phi][pi]+, [Beta](B+ 2![phi][pi]+)

A Measurement Of The Branching Ratio Kl 2 Pi Kl 3 Pi

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Author : William P. Oliver
language : en
Publisher:
Release Date : 1969

A Measurement Of The Branching Ratio Kl 2 Pi Kl 3 Pi written by William P. Oliver and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with categories.

Measurement Of The Partial Branching Fraction For Inclusive Charmless Semileptonic B Decays And Extraction Of

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language : en
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Release Date : 2005

Measurement Of The Partial Branching Fraction For Inclusive Charmless Semileptonic B Decays And Extraction Of written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.

Charmless semileptonic decays, {bar B} 2!X{sub u}l{bar {nu}}, are studied in a sample of 232 million B{bar B} decays recorded with the BABAR detector, in events where the decay of the second B meson is fully reconstructed. Inclusive charmless decays are selected in kinematic regions where the dominant background from semileptonic B decays to charm is reduced by requirements on the hadronic mass M{sub X} and the momentum transfer q2. The partial branching fraction for {bar B} 2!X{sub u}l{bar {nu}} decays for M{sub X} 1.7 GeV/c2 and q2 8 GeV2/c4 is measured to be [Delta][Beta]({bar b} 2!X{sub u}l{bar {nu}}) = (0.87 ± 0.09{sub stat} ± 0.09{sub sys} ± 0.01{sub th}) x 10−3. The CKM matrix element.

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]-