Measurement Of The Branching Fractions For Inclusive B Sup And Bar B Sup 0 Decays To Flavor Tagged D D Sub S And Lambda Sub C

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Measurement Of The Branching Fractions For Inclusive B Sup And Bar B Sup 0 Decays To Flavor Tagged D D Sub S And Lambda Sub C

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Author :
language : en
Publisher:
Release Date : 2004

Measurement Of The Branching Fractions For Inclusive B Sup And Bar B Sup 0 Decays To Flavor Tagged D D Sub S And Lambda Sub C 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.

The authors report on the inclusive branching fractions of B[sup -] and of [bar B][sup 0] mesons decaying to D[sup 0]X, [bar D][sup 0]X, D[sup +]X, D[sup -]X, D[sub s][sup +]X, D[sub s][sup -]X, [Lambda][sub c][sup +]X, [bar [Lambda]][sub c][sup -]X, based on a sample of 88.9 million B[bar B] events recorded with the BABAR detector at the [Upsilon](4S) resonance. Events are selected by completely reconstructing one B and searching for a reconstructed charmed particle in the rest of the event. The authors measure the number of charmed and of anit-charmed particles per B decay and derive the total charm yield per B[sup -] decay, n[sub c][sup -] = 1.313 [+-] 0.037 [+-] 0.037 [+-] 0.062[sub -0.043][sup +0.063], and per [bar B][sup 0] decay, n[sub c][sup 0] = 1.276 [+-] 0.062 [+-] 0.058[sub -0.046][sup +0.066] where the first uncertainty is statistical, the second is systematic, and the third reflects the charm branching-fraction uncertainties.

Measurement Of The Branching Fractions For Inclusive B And Bar B Decays To Flavor Tagged D D Sub S And Lambda Sub C

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Author :
language : en
Publisher:
Release Date : 2004

Measurement Of The Branching Fractions For Inclusive B And Bar B Decays To Flavor Tagged D D Sub S And Lambda Sub C 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.

The authors report on the inclusive branching fractions of B− and of {bar B}° mesons decaying to D°X, {bar D}°X, DX, D−X, D{sub s}+X, D{sub s}−X,?{sub c}+X, {bar {Lambda}}{sub c}−X, based on a sample of 88.9 million B{bar B} events recorded with the BABAR detector at the?(4S) resonance. Events are selected by completely reconstructing one B and searching for a reconstructed charmed particle in the rest of the event. The authors measure the number of charmed and of anit-charmed particles per B decay and derive the total charm yield per B− decay, n{sub c}− = 1.313 ± 0.037 ± 0.037 ± 0.062{sub -0.043}{sup +0.063}, and per {bar B}° decay, n{sub c}° = 1.276 ± 0.062 ± 0.058{sub -0.046}{sup +0.066} where the first uncertainty is statistical, the second is systematic, and the third reflects the charm branching-fraction uncertainties.

Recueil Factice D Articles De Presse Concernant Henriette Berthias

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language : en
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Recueil Factice D Articles De Presse Concernant Henriette Berthias written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.

Flavor Specific Inclusive B Decays To Charm

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language : en
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Release Date : 2003

Flavor Specific Inclusive B Decays To Charm 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.

We have measured the branching fractions for B[yields][bar D]X, B[yields] DX, and B[yields][bar D]X[ell][sup+][nu], where ''B'' is an average over B[sup 0] and B[sup+], ''D'' is a sum over D[sup 0] and D[sup+], and ''[bar D]'' is a sum over[bar D][sup 0] and D[sup -]. From these results and some previously measured branching fractions, we obtain[Beta](b[yields] c[bar c]s)= (21.9[+-] 3.7)%, [Beta](b[yields] sg)

Measurement Of The Relative Branching Fractions For B To D D D D Pi Ell Bar Nu Ell With A Large Sample Of Tagged B Mesons

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Author : B. Aubert
language : en
Publisher:
Release Date : 2006

Measurement Of The Relative Branching Fractions For B To D D D D Pi Ell Bar Nu Ell With A Large Sample Of Tagged B Mesons written by B. Aubert and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.

We present a study of B semileptonic decays into charm final states based on 211.7 fb{sup -1} of data collected at the {Upsilon}(4S) resonance with the BABAR detector at the PEP-II e{sup +}e{sup -} storage ring. Using a novel technique based on the simultaneous fit of a set of variables reconstructed on the recoil of a B tagged in an hadronic decay mode, we measure the relative branching fractions {Lambda}(B{sup -} {yields} D{sup 0}{ell}{sup -}{bar {nu}}{sub {ell}}) = 0.611 {+-} 0.022 (stat.) {+-} 0.027 (syst.) and {Lambda}(B{sup -} {yields} D**{sup 0})(D{sup (*)}{pi}){ell}{sup -}{bar {nu}}{sub {ell}}/{Lambda}(B{sup -} {yields} DX{ell}{sup -}{bar {nu}}{sub {ell}}) = 0.173 {+-} 0.017 (stat.) {+-} 0.021 (syst.).

Measurement Of B0 Ds D Branching Fractions And B0 Ds D Polarization With A Partial Reconstruction Technique

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language : en
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Release Date : 2003

Measurement Of B0 Ds D Branching Fractions And B0 Ds D Polarization With A Partial Reconstruction Technique 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 a study of the decays B[sup 0][yields] D[sub s][sup (*)+] D*[sup -], using 20.8 fb[sup -1] of e[sup+]e[sup -] annihilation data recorded with the BABAR detector. The analysis is conducted with a partial reconstruction technique, in which only the D[sub s][sup (*)+] and the soft pion from the D*[sup -] decay are reconstructed. They measure the branching fractions[Beta](B[sup 0][yields] D[sub s][sup (*)+] D*[sup -])= (1.03[+-] 0.14[+-] 0.13[+-] 0.26)% and[Beta](B[sup 0][yields] D[sub s][sup (*)+] D*[sup -])= (1.97[+-] 0.15[+-] 0.30[+-] 0.49)%, where the first error is statistical, the second is systematic, and the third is the error due to the D[sub s][sup+][yields][phi][pi][sup+] branching fraction uncertainty. From the B[sup 0][yields] D[sub s][sup (*)+] D*[sup -] angular distributions, they measure the fraction of longitudinal polarization[Lambda][sub L]/[Lambda]= (51.9[+-] 5.0[+-] 2.8)%, which is consistent with theoretical predictions based on factorization.

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[sup +] [yields] [eta][sub c]K[sup +] and B[sup 0] [yields] [eta][sub c]K[sup 0], where the [eta][sub c] is reconstructed in the K[sub S][sup 0] K[sup [+-]] [pi][sup [-+]] and K[sup +]K[sup -] [pi][sup 0] decay modes. Results are based on a sample of 86 million B[bar B] pairs collected with the BABAR detector at the SLAC e[sup +]e[sup -] B Factory. We measure the branching fractions [Beta](B[sup +] [yields] [eta][sub c]K[sup +]) = (1.34 [+-] 0.09 [+-] 0.13 [+-] 0.41) x 10[sup -3] and [Beta](B[sup 0] [yields] [eta][sub c]K[sup 0]) = (1.18 [+-] 0.16 [+-] 0.13 [+-] 0.37) x 10[sup -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 [yields] [eta][sub c]K events with [eta][sub c] [yields] 2(K[sup +]K[sup -]) and [eta][sub c] [yields] [phi][phi] and determine the [eta][sub c] decay branching fraction ratios [Beta]([eta][sub c] [yields] 2(K[sup +]K[sup -]))/[Beta]([eta][sub c] [yields] K[bar K][pi]) = (2.3 [+-] 0.7 [+-] 0.6) x 10[sup -2] and [Beta]([eta][sub c] [yields] [phi][phi])/[Beta]([eta][sub c] [yields] K[bar K][pi]) = (5.5 [+-] 1.4 [+-] 0.5) x 10[sup -2].

Observation Of The Decay B0 Rho Rho And Measurement Of The Branching Fraction And Polarization

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Author :
language : en
Publisher:
Release Date : 2004

Observation Of The Decay B0 Rho Rho And Measurement Of The Branching Fraction And Polarization 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 have observed the rare decay B[sup 0] [yields] [rho][sup +][rho][sup -] in a sample of 89 million B[bar B] pairs recorded with the BABAR detector. We measure the branching fraction [Beta](B[sup 0] [yields] [rho][sup +][rho][sup -]) = (27[sub -6-7][sup +7+5]) x 10[sup -6] and determine the longitudinal polarization fraction [Lambda][sub L]/[Lambda] = 0.99[sub -0.07][sup +0.01] [+-] 0.03. The results are preliminary.

Heavy Flavor Decays Of The Z0 And A Search For Flavor Changing Neutral Currents

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language : en
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Release Date : 2004

Heavy Flavor Decays Of The Z0 And A Search For Flavor Changing Neutral Currents 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.

Presented here are the results of a direct search for flavor changing neutral currents via the rare process Z[sup 0] [yields] bs and a measurement of R[sub bs] = [Lambda](Z[sup 0] [yields] bs)/[Lambda](Z[sup 0] [yields] hadrons). Because the decays Z[sup 0] [yields] b[bar b] and Z[sup 0] [yields] c[bar c] contribute significant backgrounds to Z[sup 0] [yields] bs, simultaneous measurements of R[sub b] = [Lambda](Z[sup 0] [yields] b[bar b])/[Lambda](Z[sup 0] [yields] hadrons) and R[sub c] = [Lambda](Z[sup 0] [yields] c[bar c])/[Lambda](Z[sup 0] [yields] hadrons) were also made. The standard double tag technique was extended and self calibrating tags were used for s, c, and b quarks. These measurements were made possible by the unique capabilities of the SLAC Large Detector (SLD) at the Stanford Linear Accelerator Center (SLAC): The b and c tags relied upon the SLD's VXD3 307 megapixel CCD vertex detector for topological and kinematic reconstruction of the B and D decay vertices; the s tag identified K[sup [+-]] mesons using the particle identification capabilities of SLD's Cherenkov Ring Imaging Detector (CRID), and K[sub S][sup 0] mesons and [Lambda] hadrons by kinematic reconstruction of their decay vertices in SLD's 5120 channel central drift chamber (CDC) particle tracking system.

Measurement Of B0 D S D Branching Fractions And Polarization In The Decay B0 Ds File With A Partial Reconstruction Technique

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Author :
language : en
Publisher:
Release Date : 2003

Measurement Of B0 D S D Branching Fractions And Polarization In The Decay B0 Ds File With A Partial Reconstruction Technique 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.

We present measurements of the decays B[sup 0][yields] D[sub s][sup (*)+] D*[sup -], using data recorded by the BABAR detector in 1999 and 2000, consisting of 20.8 fb[sup -1]. The analysis is conducted with a partial reconstruction technique, in which only the D[sub s][sup (*)+] and the soft pion from the D*[sup -] decay are reconstructed. From the observed rates, we measure the branching fractions[Beta](B[sup 0][yields] D[sub s][sup+] D*[sup -])= (1.03[+-] 0.14[+-] 0.13[+-] 0.26)% and[Beta](B[sup 0][yields] D*[sub s][sup+] D*[sup -])= (1.97[+-] 0.15[+-] 0.30[+-] 0.49)%, where the first error is statistical, the second is systematic, and the third is the error due to the D[sub s][sup+][yields][phi][pi][sup+] branching fraction uncertainty. From the[Beta](B[sup 0][yields] D*[sub s][sup+] D*[sup -]) angular distributions, we measure the fraction of longitudinal polarization[Lambda][sub L]/[Lambda]= (51.9[+-] 5.0[+-] 2.8)%, which is consistent with the theoretical prediction, based on factorization. These results are preliminary.