Search for Decays of the Lambda B Baryon
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| Total Pages | : 140 |
| Release | : 2011 |
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Searches for the Baryon- and Lepton-number Violating Decays $B^0\rightarrow\Lambda_c^ \ell^-$, $B^-\rightarrow\Lambda\ell^-$, and $B^-\rightarrow\bar{\Lambda}\ell^-$
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| Total Pages | : 10 |
| Release | : 2011 |
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Download Searches for the Baryon- and Lepton-number Violating Decays $B^0\rightarrow\Lambda_c^ \ell^-$, $B^-\rightarrow\Lambda\ell^-$, and $B^-\rightarrow\bar{\Lambda}\ell^-$ Book in PDF, ePub and Kindle
Searches for B mesons decaying to final states containing a baryon and a lepton are performed, where the baryon is either [Lambda]{sub c} or [Lambda] and the lepton is a muon or an electron. These decays violate both baryon and lepton number and would be a signature of physics beyond the standard model. No significant signal is observed in any of the decay modes, and upper limits in the range (3.2 - 520) x 10−8 are set on the branching fractions at the 90% confidence level.
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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| Total Pages | : |
| 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"--
Search for Semileptonic Decays in the B Meson Into the [Lambda]+[subscript C] Baryon
| Author | : Tomohiko Tanabe |
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| Total Pages | : 248 |
| Release | : 2009 |
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Download Search for Semileptonic Decays in the B Meson Into the [Lambda]+[subscript C] Baryon Book in PDF, ePub and Kindle
Search for The. Lambda. Sub B Baryon at CDF.
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| Total Pages | : 6 |
| Release | : 1992 |
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Download Search for The. Lambda. Sub B Baryon at CDF. Book in PDF, ePub and Kindle
The?{sub b} baryon has been observed recently by UA1 through its decay?{sub b} → J/??°. Although CDF finds twice as many J/? and observes?° decays, no evidence for an?{sub b} signal is seen. The UA1 data supports a lower than expected production P{sub T} for the?{sub b}, and therefore, a lower pion P{sub T}, below the observation threshold of CDF. This result suggests that UA1 and CDF are probably not inconsistent, but also that the production models are not quite right.
Measurement of the Lambda-b Baryon Lifetime in Z Decays
| Author | : Owen J. Hayes |
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| Total Pages | : 224 |
| Release | : 1999 |
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Search for the Baryon and Lepton Number Violating Decays Tau to Lambda H
| Author | : B. Aubert |
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| Total Pages | : 15 |
| Release | : 2006 |
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Download Search for the Baryon and Lepton Number Violating Decays Tau to Lambda H Book in PDF, ePub and Kindle
The authors have searched for the violation of baryon number B and lepton number L in the (B-L)-conserving modes {tau}{sup -} {yields} {bar {Lambda}}{sup 0}{pi}{sup -} and {tau}{sup -} {yields} {bar {Lambda}}{sup 0}K{sup -} as well as the (B-L)-violating modes {tau}{sup -} {yields} {Lambda}{sup 0}{pi}{sup -} and {tau}{sup -} {yields} {Lambda}{sup 0}K{sup -} using 237 fb{sup -1} of data collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} storage ring. They do not observe any signal and determine preliminary upper limits on the branching fractions {Beta}({tau}{sup -} {yields} {bar {Lambda}}{sup 0}{pi}{sup -})
Search for Baryon-number and Lepton-number Violating Decays of $Lambda$ Hyperons Using the CLAS Detector at Jefferson Laboratory
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| Release | : 2015 |
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Download Search for Baryon-number and Lepton-number Violating Decays of $Lambda$ Hyperons Using the CLAS Detector at Jefferson Laboratory Book in PDF, ePub and Kindle
We present a search for ten baryon-number violating decay modes of $\Lambda$ hyperons using the CLAS detector at Jefferson Laboratory. Nine of these decay modes result in a single meson and single lepton in the final state ($\Lambda \rightarrow m \ell$) and conserve either the sum or the difference of baryon and lepton number ($B \pm L$). The tenth decay mode ($\Lambda \rightarrow \bar{p}\pi^+$) represents a difference in baryon number of two units and no difference in lepton number. We observe no significant signal and set upper limits on the branching fractions of these reactions in the range $(4-200)\times 10^{-7}$ at the $90\%$ confidence level.
Study of Lambda+(c) Cabibbo Favored Decays Containing a Lambda Baryon in the Final State
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| Total Pages | : 14 |
| Release | : 2005 |
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Download Study of Lambda+(c) Cabibbo Favored Decays Containing a Lambda Baryon in the Final State Book in PDF, ePub and Kindle
Using data from the FOCUS experiment (FNAL-E831), they study the decay of ?{sub c}+ baryons into final states contain a ? hyperon. The branching fractions of ?{sub c}+ into ??+, ??+?+?− and ?{bar K}°K+ relative to that into pK− ?+ are measured to be 0.217 ± 0.013 ± 0.020, 0.508 ± 0.024 ± 0.024 and 0.142 ± 0.018 ± 0.022, respectively. New measurements are also reported. Further, an analysis of the subresonant structure for the ?{sub c}+ → ??+?+?− decay mode is presented.
A Sensitivity Study for the Search for the Rare B-meson to Lambda-baryon Proton Neutrino Antineutrino Decay at the BABAR Experiment
| Author | : Robert Seddon |
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| Total Pages | : |
| Release | : 2015 |
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Download A Sensitivity Study for the Search for the Rare B-meson to Lambda-baryon Proton Neutrino Antineutrino Decay at the BABAR Experiment Book in PDF, ePub and Kindle
"We present a sensitivity study for the search for the semi-leptonic, flavour-changing-neutral-current decay B- -> lambda pbar nu nubar. B- -> lambda pbar nu nubar is expected to be highly suppressed in the Standard Model and thus provides a sensitive probe to test for new physics. A branching fraction for B- -> lambda pbar nu nubar has never been experimentally measured.The analysis is conducted using data from the BABAR particle detector, based at the SLAC National Accelerator Laboratory, California, USA. The BABAR dataset comprises approximately 471 million BBbar pairs produced from e-e+ -> Upsilon(4S) collisions and subsequently Upsilon(4S) [right arrow] BBbar.Using hadronic tag reconstruction we separate the two B mesons in each event by fully reconstructing one B meson from known hadronic decay modes, we then conduct a search for B- -> lambda pbar nu nubar in the decay of the other B meson. Using Monte-Carlo simulations of B- -> lambda pbar nu nubar we develop a signal selection designed to isolate B- -> lambda pbar nu nubar while suppressing potential background processes.Data is blinded at later stages of the analysis and we provide a range of possible branching fraction upper limits as a function of the number of data events which might survive the signal selection. Assuming we observe no excess of data events over those predicted by Monte-Carlo, we predict branching fraction upper limits for B- -> lambda pbar nu nubar at the 90% confidence level of 2.64 x 10^-5 using the Barlow method and 3.10 x 10^-5 using the Feldman-Cousins method." --
