Measurement Of The B Rightarrow P Bar P K Branching Fraction And Study Of The Decay Dynamics

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Measurement Of The B Rightarrow P Bar P K Branching Fraction And Study Of The Decay Dynamics

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Author :
language : en
Publisher:
Release Date : 2005

Measurement Of The B Rightarrow P Bar P K Branching Fraction And Study Of The Decay Dynamics 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.

With a sample of 232 x 106 [Upsilon](4S) 2!B{bar B} events collected with the BABAR detector, we study the decay B 2!p{bar p}K excluding charmonium decays to p{bar p}. We measure a branching fraction [Beta](B+ 2!p{bar p}K+) = (6.7 ± 0.5 ± 0.4) x 10−6. An enhancement at low p{bar p} mass is observed and the Dalitz plot asymmetry suggests dominance of the penguin amplitude in this B decay. We search for a pentaquark candidate [Theta]*{sup ++} decaying into pK+ in the mass range 1.43 to 2.00 GeV/c2 and set limits on [Beta](B+ 2![Theta]*{sup ++} {bar p}) x [Beta]([Theta]*{sup ++} 2!pK+) at the 10−7 level.

Measurement Of The Branching Fractions For The Decays B D P Bar P B D P Bar P B0 D P Bar P And B D P Bar P

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Author :
language : en
Publisher:
Release Date : 2004

Measurement Of The Branching Fractions For The Decays B D P Bar P B D P Bar P B0 D P Bar P And B D P Bar P 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 B° meson decay modes B° --> D*−p{bar p}?, D−p{bar p}+, {bar D}*°p{bar p}, and B° --> {bar D}°p{bar p} are studied in a sample of 124 x 106 B{bar B} pairs collected with the BABAR detector at the PEP-II collider. The decay of B° --> D−p{bar p}?+ is observed for the first time, with a measured branching fraction B(B° --> D−p{bar p}?+) = (3.80 ± 0.35 ± 0.46) x 10−4. The following branching fractions are also determined: B(B° --> D*−p{bar p}?+) = (5.61 ± 0.59 ± 0.73) x 10−4, B(B° --> {bar D}*° p{bar p}) = (0.67 ± 0.21 ± 0.09) x 10−4, and B(B° --> {bar D}°p{bar p}) = (1.24 ± 0.14 ± 0.12) x 10−4. In each decay mode the invariant mass spectra of the charmed mesons and the baryons are compared with a pure phase-space hypothesis in order to gain insight into the B meson decay dynamics. In particular, the Dalitz plots of {bar D}*°p versus {bar D}*°{bar p} for B° --> {bar D}*°p{bar p} and of {bar D}°p versus {bar D}°{bar p} for B° --> {bar D}°p{bar p} are presented. All results are preliminary.

Measurement Of The B0 Lambda Bar P Pi Branching Fraction Andstudy Of The Decay Dynamics

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Author : M. Bondioli
language : en
Publisher:
Release Date : 2006

Measurement Of The B0 Lambda Bar P Pi Branching Fraction Andstudy Of The Decay Dynamics written by M. Bondioli 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 measurement of the B{sup 0} {center_dot} {bar {Lambda}}p{pi}{sup -} branching fraction performed using the BABAR detector at the PEP-II asymmetric energy e{sup +}e{sup -} collider. Based on a 232 million B{bar B} pairs data sample we measure: {center_dot} (B{sup 0} {center_dot} {bar {Lambda}}p{pi}{sup -}) = [3.30 {center_dot} 0.53(stat.) {center_dot} 0.31 (syst.)] {center_dot} 10{sup -6}. A measurement of the differential spectrum as a function of the di-baryon invariant mass m({Lambda}p) is also presented; this shows a near-threshold enhancement similar to that observed in other baryonic B decays.

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.

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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Author :
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.

Study Of The B J Psi K Pi Pi Decay And Measurement Of The B X 3872 K Branching Fraction

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Author :
language : en
Publisher:
Release Date : 2004

Study Of The B J Psi K Pi Pi Decay And Measurement Of The B X 3872 K Branching Fraction 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 study the decay B− → J/?K−??− using 117 million B{bar B} events collected at the?(4S) resonance with the BaBar detector at the PEP-II e+e− asymmetric-energy storage ring. They measure the branching fractions?(B− → J/?K−?+?−) = (116 ± 7(stat.) ± 9(syst.)) x 10−5 and?(B− → X(3872)K−) x?(X(3872) → J/??+?−) = (1.28 ± 0.41) x 10−5 and find the mass of the X(3872) to be 3873.4 ± 1.4MeV/c2. They search for the h{sub c} narrow state in the decay B− → h{sub c} K−, h{sub c} → J/??+?− and for the decay B− → J/?D°?−, with D° → K−?+. They set the 90% C.L. limits?(B− → h{sub c}K−) x?(h{sub c} → J/??+?−)

Measurement Of The Branching Fraction And Polarization For The Decay B 2 D K

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Author :
language : en
Publisher:
Release Date : 2003

Measurement Of The Branching Fraction And Polarization For The Decay B 2 D 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 2003 with categories.

The authors present a study of the decay B− → D*° K*− based on a sample of 86 million [Upsilon](4S) → B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factor at SLAC. The authors measure the branching fraction [Beta](B− → D*° K*−) = (8.3 ± 1.1(stat) ± 1.0(syst)) x 10−4, and the fraction of longitudinal polarization in this decay to be [Lambda]{sub L}/[Lambda] = 0.86 ± 0.06(stat) ± 0.03(syst).

Measurement Of The Branching Fraction And Polarization For The Decay B Sup Yields D Sup 0 K Sup

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Author :
language : en
Publisher:
Release Date : 2003

Measurement Of The Branching Fraction And Polarization For The Decay B Sup Yields D Sup 0 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 a study of the decay B[sup -][yields] D*[sup 0] K*[sup -] based on a sample of 86 million[Upsilon](4S)[yields] B[bar B] decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factor at SLAC. The authors measure the branching fraction[Beta](B[sup -][yields] D*[sup 0] K*[sup -])= (8.3[+-] 1.1(stat)[+-] 1.0(syst)) x 10[sup -4], and the fraction of longitudinal polarization in this decay to be[Lambda][sub L]/[Lambda]= 0.86[+-] 0.06(stat)[+-] 0.03(syst).

Measurement Of B0bar D 0 K 0bar Branchingfractions

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

Measurement Of B0bar D 0 K 0bar Branchingfractions 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.

The authors present a study of the decays {bar B}{sup 0} {yields} D{sup (*)0}{bar K}{sup (*)0} using a sample of 226 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at SLAC. They report evidence for the decay of B{sup 0} and {bar B}{sup 0} mesons to the D*{sup 0}K{sub S}{sup 0} final state with an average branching fraction {Beta}({bar B}{sup 0} {yields} D*{sup 0} {bar K}{sup 0}) {triple_bond} {Beta}({bar B}{sup 0} {yields} D*{sup 0} {bar K}{sup 0}) + {Beta}(B{sup 0} {yields} D*{sup 0}K{sup 0})/2 = (3.6 {+-} 1.2 {+-} 0.3) x 10{sup -5}.

Branching Fraction Measurements Of B Eta C K Decays

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Author :
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.