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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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.

Study Of Inclusive B And Bar B 0 Decays Toflavor Tagged D D S And Lambda C

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

Study Of Inclusive B And Bar B 0 Decays Toflavor Tagged D D S And Lambda C 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 report on a study of inclusive B{sup -} and {bar B}{sup 0} meson decays 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 231 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 charm particle in the rest of the event. From the measured branching fractions of these decays, we infer the number of charm and anti-charm particles per {bar B} decay, separately for charged and neutral parents. We derive the total charm yield per B{sup -} decay, n{sub c}{sup -} = 1.202 {+-} 0.023 {+-} 0.040{sub -0.029}{sup +0.035}, and per {bar B}{sup 0} decay, n = 1.193 {+-} 0.030 {+-} 0.034{sub -0.035}{sup +0.044} where the first uncertainty is statistical, the second is systematic, and the third reflects the charm branching-fraction uncertainties. We also present the charm momentum distributions measured in the {bar B} rest frame.

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.).

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].

Measurement Of Ratios Of Branching Fractions And Cp Violating Asymmetries Of B D K Decays

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language : en
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Release Date : 2008

Measurement Of Ratios Of Branching Fractions And Cp Violating Asymmetries Of B D 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 2008 with categories.

The authors report a study of B{sup ±} 2!D*K{sup ±} decays with D* decaying to D[pi]° or D[gamma], using 383 x 106 B{bar B} pairs collected at the [Upsilon](4S) resonance with the BABAR detector at the SLAC PEP-II B-Factory. The D meson decays under study include a non-CP mode (K{sup ±}[pi]{sup {-+}}), CP-even modes (K{sup ±}K{sup {-+}}, [pi]{sup ±}[pi]{sup {-+}}) and CP-odd modes (K{sub S}°[pi]°, K{sub S}°[phi], K{sub S}°[omega]). They measure ratios (R*{sub CP±}) of branching fractions of decays to CP eigenmode states and to flavor-specific states as well as CP asymmetries A*{sub CP±} = -0.11 ± 0.09 ± 0.01, R*{sub CP+} = 1.31 ± 0.13 ± 0.04, and A*{sub CP-} = 0.06 ± 0.10 {+-} 0.02, R*{sub CP-} = 1.10 {+-} 0.12 {+-} 0.04, where the first error is statistical and the second error is systematic. Translating the results into an alternative parameterization, widely used for related measurements, they obtain x*+ = 0.11 {+-} 0.06 {+-} 0.02 and x* = 0.00 {+-} 0.06 {+-} 0.01. No significant CP-violating charge asymmetry is found in either the flavor-specific mode D 2!K{sup {+-}}[pi]{sup {-+}} or in B{sup {+-}} 2!D*[pi]{sup {+-}} decays.

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

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Author :
language : en
Publisher:
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.

Measurement Of The Production Fraction Times Branching Fraction Boldsymbol F B To Lambda B Cdot Mathcal B Lambda B To J Psi Lambda

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Author :
language : en
Publisher:
Release Date : 2011

Measurement Of The Production Fraction Times Branching Fraction Boldsymbol F B To Lambda B Cdot Mathcal B Lambda B To J Psi Lambda 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.

The [Lambda]{sub b}(udb) baryon is observed in the decay [Lambda]{sub b} → J/[psi][Lambda] using 6.1 fb−1 of p{bar p} collisions collected with the D0 detector at √s = 1.96 TeV. The production fraction multiplied by the branching fraction for this decay relative to that for the decay B° → J/[psi]K{sub s}° is measured to be 0.345 ± 0.034 (stat.) ± 0.033 (syst.) ± 0.003 (PDG). Using the world average value of f(b → B°) · [Beta](B° → J/[psi]K{sub s}°) = (1.74 ± 0.08) x 10−5, they obtain f(b → [Lambda]{sub b}) · [Beta]([Lambda]{sub b} → J/[psi][Lambda]) = (6.01 ± 0.60 (stat.) ± 0.58 (syst.) ± 0.28 (PDG)) x 10−5. This measurement represents an improvement in precision by about a factor of three with respect to the current world average.