Study Of Bbar To Xu L Nubar Decays In Bbbar Events Tagged By A Fully Reconstructed B Meson Decay And Determination Of
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Study Of Bbar To Xu L Nubar Decays In Bbbar Events Tagged By A Fully Reconstructed B Meson Decay And Determination Of
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Author :
language : en
Publisher:
Release Date : 2012
Study Of Bbar To Xu L Nubar Decays In Bbbar Events Tagged By A Fully Reconstructed B Meson Decay And Determination Of written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
We report measurements of partial branching fractions for inclusive charmless semileptonic B decays {bar B} → X{sub u}l{bar {nu}}, and the determination of the CKM matrix element.
Measurement Of The Branching Fractions Of Bbar D L Nubar L Decays In Events Tagged By A Fully Reconstructed B Meson
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Author :
language : en
Publisher:
Release Date : 2008
Measurement Of The Branching Fractions Of Bbar D L Nubar L Decays In Events Tagged By A Fully Reconstructed B Meson 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.
We report a measurement of the branching fractions of {bar B} 2!D** l−{bar {nu}}{sub l} decays based on 417 fb−1 of data collected at the [Upsilon](4S) resonance with the BABAR detector at the PEP-II ee− storage rings. Events are selected by fully reconstructing one of the B mesons in a hadronic decay mode. A fit to the invariant mass differences m(D{sup (*)})-m(D{sup (*)}) is performed to extract the signal yields of the different D** states. We observe the {bar B} 2!D**{ell}−{bar {nu}}{sub {ell}} decay modes corresponding to the four D** states predicted by Heavy Quark Symmetry with a significance greater than six standard deviations including systematic uncertainties.
Measurement Of The Relative Branching Fractions Of Bbar To D D D L Nubar L Decays In Events With A Fully Reconstructed B Meson
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Author :
language : en
Publisher:
Release Date : 2007
Measurement Of The Relative Branching Fractions Of Bbar To D D D L Nubar L Decays In Events With A Fully Reconstructed B Meson written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
We determine the relative branching fractions of semileptonic B decays to charmed final states. The measurement is performed on the recoil from a fully reconstructed B meson in a sample of 362 million B{bar B} pairs collected at the [Upsilon](4S) resonance with the BABAR detector. A simultaneous fit to a set of discriminating variables is performed on a sample of {bar B} → DXl−{bar {nu}}{sub {ell}} decays to determine the contributions from the different channels.
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
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Author : Robert Seddon
language : en
Publisher:
Release Date : 2019
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 written by Robert Seddon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
"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 Bbar To Lambda C X L Nu Decays In Events With A Fully Reconstructed B Meson
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Author :
language : en
Publisher:
Release Date : 2012
Search For Bbar To Lambda C X L Nu Decays In Events With A Fully Reconstructed B Meson written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
We present a search for semileptonic B decays to the charmed baryon [Lambda]{sub c} based on 420 fb−1 of data collected at the [Upsilon](4S) resonance with the BABAR detector at the PEP-II e+e− storage rings. By fully reconstructing the recoiling B in a hadronic decay mode, we reduce non-B backgrounds and determine the flavor of the signal B. We statistically correct the flavor for the effect of the B° mixing. We obtain a 90% confidence level upper limit of [Beta]({bar B} 2![Lambda]{sub c}+ Xl− {bar [nu]}{sub l})/[Beta]({bar B} 2![Lambda]{sub c}+ X)
Study Of B Ulnu Bar Decays On The Recoil Of Fully Reconstructed B Mesons And Determination Of Verticalvub Vertical
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Author :
language : en
Publisher:
Release Date : 2004
Study Of B Ulnu Bar Decays On The Recoil Of Fully Reconstructed B Mesons And Determination Of Verticalvub Vertical 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.
No abstract prepared.
A Measurement Of The Branching Fractions Ofexclusive Bbar To D Pi Lnu Decays In Events With A Fully Reconstructed Bmeson
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Author :
language : en
Publisher:
Release Date : 2008
A Measurement Of The Branching Fractions Ofexclusive Bbar To D Pi Lnu Decays In Events With A Fully Reconstructed Bmeson 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 measurement of the branching fractions for {bar B} → D{sup (*)}?l−{bar ?}{sub l} decays based on 341.1 fb−1 of data collected at the ?(4S) resonance with the BABAR detector at the PEP-II e+e− storage rings. Events are tagged by fully reconstructing one of the B mesons in a hadronic decay mode. The obtain ?(B− → D°l−{bar ?}{sub l}) = (2.33 ± 0.09{sub stat.} ± 0.09{sub syst.})%, ?(B− → D*°l−{bar ?}{sub l}) = 5.83 ± 0.15{sub stat.} ± 0.30{sub syst.}%, ?({bar B}° → D+l−{bar ?}{sub l}) = (2.21 ± 0.11{sub stat.} ± 0.12{sub syst.})% ?({bar B}° → D*+l−{bar ?}{sub l}) = 5.49 ± 0.16{sub stat.} ± 0.25{sub syst.}%, ?(B− → D+?−l−{bar ?}{sub l}) = (0.42 ± 0.06{sub stat.} ± 0.03{sub syst.})%, ?(B− → D*+ ?−l−{bar ?}{sub l}) = (0.59 ± 0.05{sub stat.} ± 0.04{sub syst.})%, ?({bar B}° → D°?+l−{bar ?}{sub l}) = (0.43 ± 0.08{sub stat.} ± 0.03{sub syst.})% and ?({bar B}° → D*° ?+l−{bar ?}{sub l}) = (0.48 ± 0.08{sub stat.} ± 0.04{sub syst.})%.
A Measurement Of The Lifetime And Mixing Frequency Of Neutral B Mesons With Semileptonic Decays In The Babar Detector
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Author :
language : en
Publisher:
Release Date : 2003
A Measurement Of The Lifetime And Mixing Frequency Of Neutral B Mesons With Semileptonic Decays In The Babar Detector 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 neutral B meson, consisting of a b quark and an anti-d quark, can mix (oscillate) to its own anti-particle through second-order weak interactions. The measurement of the mixing frequency can constrain the quark mixing matrix in the Standard Model of particle physics. The PEP-II B-factory at the Stanford Linear Accelerator Center provides a very large data sample that enables us to make measurements with much higher precisions than previous measurements, and to probe physics beyond the Standard Model. The lifetime of the neutral B meson[tau][sub B0] and the B[sup 0]-[bar B][sup 0] mixing frequency[Delta]m[sub d] are measured with a sample of approximately 14,000 exclusively reconstructed B[sup 0][yields] D*[sup -][ell][sup+][nu][sub[ell]] signal events, selected from 23 million B[bar B] pairs recorded at the[Upsilon](4S)resonance with the BABAR detector at the asymmetric-energy e[sup+]e[sup -] collider, PEP-II. The decay position of the exclusively reconstructed B is determined by the charged tracks in the final state, and its b-quark flavor at the time of decay is known unambiguously from the charge of the lepton. The decay position of the other B is determined inclusively, and its b-quark flavor at the time of decay is determined (tagged) with the charge of tracks in the final state, where identified leptons or kaons give the most information. The decay time difference of two B mesons in the event is calculated from the distance between their decay vertices and the Lorentz boost of the center of mass. Additional samples of approximately 50,000 events are selected for studies of background events. The lifetime and mixing frequency, along with wrong-tag probabilities and the time-difference resolution function, are measured simultaneously with an unbinned maximum-likelihood fit that uses, for each event, the measured difference in B decay times ([Delta]t), the calculated uncertainty on[Delta]t, the signal and background probabilities, and b-quark tagging for the other B meson. The results are[tau][sub B[sup 0]]= (1.523[sub -0.023][sup+0.024][+-] 0.022) ps and[Delta]m[sub d]= (0.492[+-] 0.018[+-] 0.013) ps[sup -1], where the first error is statistical and the second is systematic. The statistical correlation coefficient between[tau][sub B[sup 0]] and[Delta]m[sub d] is -0.22. This result is consistent with the current world average values, the total errors are comparable with other most-precise measurements.
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.
Study Of B Ulnu Bar Decays On The Recoil Of Fully Reconstructed B Mesons And Determination Of
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Author :
language : en
Publisher:
Release Date : 2004
Study Of B Ulnu Bar Decays On The Recoil Of Fully Reconstructed B Mesons And Determination Of 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.