Observation Of The Baryonic B Decay B0bar To Lambda C Anti Lambda K PDF Download

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Observation of the Baryonic B Decay B0bar to Lambda_c^+ Anti-Lambda K-

Observation of the Baryonic B Decay B0bar to Lambda_c^+ Anti-Lambda K-
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Total Pages: 7
Release: 2011
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The authors report the observation of the baryonic B decay {bar B}° 2![Lambda]{sub c} {bar [Lambda]}K− with a significance larger than 7 standard deviations based on 471 x 106 B{bar B} pairs collected with the BABAR detector at the PEP-II storage ring at SLAC. They measure the branching fraction for the decay {bar B}° 2![Lambda]{sub c}+ {bar [Lambda]}K− to be (3.8 ± 0.8{sub stat} ± 0.2{sub sys} ± 1.0 {sub {Lambda}{sub c}+}) x 10−5. The uncertainties are statistical, systematic, and due to the uncertainty in the {Lambda}{sub c}+ branching fraction. They find that the {Lambda}{sub c}+ K− invariant mass distribution shows an enhancement above 3.5 GeV/c2.

Observation of the Baryonic B-decay B0bar -> LambdaC Antiproton K- Pi

Observation of the Baryonic B-decay B0bar -> LambdaC Antiproton K- Pi
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Total Pages: 7
Release: 2009
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The authors report the observation of the baryonic B-decay {bar B}° → ?{sub c}+{bar p}K−?+, excluding contributions from the decay {bar B}° → ?{sub c}+{bar ?}K−. Using a data sample of 467 million B{bar B} pairs collected with the BABAR detector at the PEP-II storage ring at SLAC, the measured branching fraction is (4.33 ± 0.82){sub stat} ± 0.33{sub syst} ± 1.13{sub ?{sub c}+} x 10−5. In addition they find evidence for the resonant decay {bar B}° → ?{sub c}(2455){sup ++}{bar p}K− and determine its branching fraction to be (1.11 ± 0.30{sub stat} ± 0.09{sub syst} ± 0.29{sub ?{sub c}+}) x 10−5. The errors are statistical, systematic, and due to the uncertainty in the ?{sub c}+ branching fraction. For the resonant decay {bar B}° → ?{sub c}+{bar p}{bar K}*° we obtain an upper limit of 2.42 x 10−5 at 90% confidence level.

Observation of the Baryonic Flavor-Changing Neutral Current Decay $\Lambda_b0̂ \to \Lambda \mu+̂ \mu-̂$

Observation of the Baryonic Flavor-Changing Neutral Current Decay $\Lambda_b0̂ \to \Lambda \mu+̂ \mu-̂$
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Total Pages: 7
Release: 2011
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The authors report the first observation of the baryonic flavor-changing neutral current decay?{sub b}° →???− with 24 signal events and a statistical significance of 5.8 Gaussian standard deviations. This measurement uses a p{bar p} collisions data sample corresponding to 6.8 fb−1 at √s = 1.96 TeV collected by the CDF II detector at the Tevatron collider. The total and differential branching ratios for?{sub b}° →??+?− are measured. They find?(?{sub b}° →??+?−) = [1.73 ± 0.42(stat) ± 0.55(syst)] x 10−6. They also report the first measurement of the differential branching ratio of B{sub s}° →??+?− using 49 signal events. In addition, they report branching ratios for B+ → K+?+?−, B° → K°?+?− and B → K*(892)?+?− decays.

Search for the Rare Decay of a B Meson Into a Lambda Baryon, Proton and Neutrino-antineutrino Pair at the BABAR and Belle II Experiments

Search for the Rare Decay of a B Meson Into a Lambda Baryon, Proton and Neutrino-antineutrino Pair at the BABAR and Belle II Experiments
Author: Robert Seddon
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Release: 2019
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"We present two analyses of the rare B- -> Lambda pbar nu nubar decay. Within the Standard Model, the process B- -> Lambda pbar nu nubar is permitted but highly suppressed, with an expected branching fraction of (7.9 +/- 1.9) x 10^-7. This rarity makes it a sensitive probe for the existence of new physics, which may be discoverable in the form of a higher than predicted branching fraction.The first analysis is conducted on data collected at the BABAR experiment, which ran from 1999-2008. BABAR collected 433 fb^-1 of integrated luminosity at the Upsilon(4S) resonance; Upsilon(4S) decays almost exclusively into B-Bbar pairs, and this analysis uses hadronic tag reconstruction to fully reconstruct one of the B-mesons in this pair. The search for B- -> Lambda pbar nu nubar is then conducted among the decay products of the second, unreconstructed B-meson. Using both real data and Monte Carlo simulations, we develop and implement a signal selection that selects candidates conforming to the expected characteristics of B- -> Lambda pbar nu nubar decays. The result of the analysis is an upper limit on the branching fraction at the 90% confidence level of 3.02 x 10^-5. This is the world's first experimental result in the search for B- -> Lambda pbar nu nubar decays.The second analysis is conducted on Monte Carlo simulations of data that will be collected at Belle II, the world's only next-generation B-meson facility. Over its lifetime Belle II will collect 50 ab^-1 of data, approximately 100 times that of BABAR. This increase in data, along with more capable hardware and software, should allow Belle II to search for B- -> Lambda pbar nu nubar decays with greater sensitivity than BABAR. Using a simulated dataset equivalent in size to that used in our BABAR study, we employ Full Event Interpretation to fully reconstruct the decay of one B-meson in each B-Bbar pair, and conduct our signal selection in the remainder of the data. The result of the analysis is a predicted upper limit on the branching fraction at the 90% confidence level of 1.2 x 10^-4. A comparison of the Belle II and BABAR results highlights several areas where Belle II will need to improve in order to make best use of its projected dataset"--