Observation And Study Of B Meson Decays With Lambda C Baryons With The Babar Detector
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Observation And Study Of B Meson Decays With Lambda C Baryons With The Babar Detector
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Author :
language : en
Publisher:
Release Date : 2013
Observation And Study Of B Meson Decays With Lambda C Baryons With 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 2013 with categories.
Study Of B Meson Decays To Final States With A Single Charm Baryon
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Author :
language : en
Publisher:
Release Date : 2007
Study Of B Meson Decays To Final States With A Single Charm Baryon 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.
A study of B-meson decays to final states with a single charm baryon is presented based on data recorded by the BABAR detector at the Stanford Linear Accelerator Center. Although the B meson is the lightest bottom-flavored meson, it is heavy enough to decay to a baryon made of three quarks and an antibaryon made of three antiquarks. By studying the baryonic weak decays of the B meson, we can investigate baryon production mechanisms in heavy meson decays. In particular, we measure the rates of the decays B- → [Lambda]+c$\bar{p}$[pi]- and $\bar{B}$0 → [Lambda]+c$\bar{p}$. Comparing these rates, we confirm an observed trend in baryonic B decays that the decay with the lower energy release, B- → [Lambda]+c$\bar{p}$[pi]-, is favored over $\bar{B}$0 → [Lambda]+c$\bar{p}$. The dynamics of the baryon-antibaryon ([Lambda]+c$\bar{p}$) system in the three-body decay also provide insight into baryon-antibaryon production mechanisms. The B- → [Lambda]+c$\bar{p}$[pi]- system is a laboratory for searches for excited #c baryon states; we observe the resonant decays B- → [Sigma]c(2455) 0$\bar{p}$ and B- → [Sigma]c(2800) 0$\bar{p}$. This is the first observation of the decay B- → [Sigma]c(2800) 0$\bar{p}$; however, the mass of the observed #c(2800)0 state is inconsistent with previous measurements. Finally, we examine the angular distribution of the B- → [Sigma]c(2455) 0$\bar{p}$ decays and measure the spin of the B- → [Sigma]c(2455) 0$\bar{p}$ baryon to be J = 1/2, as predicted by the quark model.
A Measurement Of The Lambda C Baryon Decays To Proton Kaon Pion Absolute Branching Fraction With The Babar Detector
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Author :
language : en
Publisher:
Release Date : 2004
A Measurement Of The Lambda C Baryon Decays To Proton Kaon Pion Absolute Branching Fraction With 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 2004 with categories.
A measurement of [Beta]([Lambda][sub c][sup +] [yields] pK[sup -] [pi][sup +]) is presented based on data collected with the BaBar detector at the Stanford Linear Accelerator Center. Branching fraction measurements represent a large portion of what is known about short-lived particles, the strong force that binds them, and the weak force that causes them to decay. While the majority of branching fraction measurements are done as ratios between two decay modes, it is the absolute measurements of a few particular decay modes that set the scale for these relative measurements. The [Lambda][sub c][sup +] particle is one of the four weakly decaying hadrons into which more than 90% of the known heavy quark hadrons will eventually decay. Thus, an absolute measurement of the branching fraction for [Lambda][sub c][sup +] [yields] pK[sup -][pi][sup +] is important for many studies of the heavy quark sector, from spectroscopy to B meson decays. The number of produced [Lambda][sub c][sup +]'s is inferred from the number of events reconstructed with an antiproton and an accompanying D meson. The final result of [Beta]([Lambda][sub c][sup +] [yields] pK[sup -] [pi][sup +]) = [6.12 [+-] 0.31(stat.) [+-] 0.42(syst.)]% represents more than a two-fold improvement in precision over the world average. The dominant source of systematic uncertainty is the irreducible background of [Xi][sub c] baryons.
Search For Semileptonic Decays In The B Meson Into The Lambda Subscript C Baryon
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Author : Tomohiko Tanabe
language : en
Publisher:
Release Date : 2009
Search For Semileptonic Decays In The B Meson Into The Lambda Subscript C Baryon written by Tomohiko Tanabe and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Study Of B Meson Decays To Ppbarh Final States
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Author : Tetiana B. Hryn'ova
language : en
Publisher:
Release Date : 2006
Study Of B Meson Decays To Ppbarh Final States written by Tetiana B. Hryn'ova 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.
B mesons are unique among well-established non-quarkonium mesons in their ability to decay into baryons. Baryonic B decays offer a wide range of interesting areas of study: they can be used to test our theoretical understanding of rare decay processes involving baryons, search for direct CP violation and study low-energy QCD. This thesis presents measurements of branching fractions and a study of the decay dynamics of the charmless three-body decays of B meson into p{bar p}h final states, where h = {pi}{sup +}, K{sup +}, K{sub S}{sup 0}, K*{sup 0} or K*{sup +}. With a sample of 232 million {Upsilon}(4S) {yields} B{bar B} events collected with the BaBar detector, we report the first observation of the B {yields} p{bar p}K*{sup 0} decay, and provide improved measurements of branching fractions of the other modes. The distribution of the three final-state particles is of particular interest since it provides dynamical information on the possible presence of exotic intermediate states such as the hypothetical pentaquark states {Theta}*{sup ++} and {Theta}{sup +}in the m{sub pK{sup +}} and m{sub pK{sub S}{sup 0}} spectra, respectively, or glueball states (such as the tensor glueball f{sub J}(2220)) in the m{sub p{bar p}} spectrum. No evidence for exotic states is found and upper limits on the branching fractions are set. An enhancement at low p{bar p} mass is observed in all the B {yields} p{bar p}h modes, and its shape is compared between the decay modes and with the shape of the time-like proton form factor. A Dalitz plot asymmetry in B {yields} p{bar p}K{sup +} mode suggests dominance of the penguin amplitude in this decay and disfavors the possibility that the low mass p{bar p} enhancement originates from the presence of a resonance below threshold (such as the recently seen baryonium candidate at 1835 MeV/c{sup 2}). We also identify decays of the type B {yields} X{sub c{bar c}}h {yields} p{bar p}h, where h = K{sup +}, K{sub S}{sup 0}, K*{sup 0} or K*{sup +}, and X{sub c{bar c}} = {eta}{sub c} or J/{psi}. In particular, we report on the evidence of the B {yields} {eta}{sub c}K*{sup +} decay and provide a measurement of the width of {eta}{sub c}.
Measurements Of Cal B Overline B 0 To Lambda C Overline P And Cal B B To Lambda C Overline P Pi And Studies Of Lambda C Pi Resonances
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Author :
language : en
Publisher:
Release Date : 2008
Measurements Of Cal B Overline B 0 To Lambda C Overline P And Cal B B To Lambda C Overline P Pi And Studies Of Lambda C Pi Resonances 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 present an investigation of the decays {bar B}° →?{sub c}{bar p} and B− →?{sub c}+{bar p}?− based on 383 x 106?(4S) → B{bar B} decays recorded with the BABAR detector. They measure the branching fractions of these decays; their ratio is?(B− →?{sub c}+{bar p}?−)/?({bar B}° →?{sub c}+{bar p}) = 15.4 ± 1.8 ± 0.3. The B− →?{sub c}+{bar p}?− process exhibits an enhancement at the?{sub c}+{bar p} threshold and is a laboratory for searches for excited charm baryon states. They observe the resonant decays B− →?{sub c}(2455)°{bar p} and B−?{sub c}(2800)°{bar p} but see no evidence for B− →?{sub c}(2520)°{bar p}. This is the first observation of the decay B− →?{sub c}(2800)°{bar p}; however, the mass of the observed excited?{sub c}° state is (2846 ± 8 ± 10) MeV/c2, which is somewhat inconsistent with previous measurements. Finally, they examine the angular distribution of the B− →?{sub c}(2455)°{bar p} decays and measure the spin of the?{sub c}(2455)° baryon to be 1/2, as predicted by the quark model.
Observation And Study Of The Baryonic B Meson Decays B To D P Pbar
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Author :
language : en
Publisher:
Release Date : 2012
Observation And Study Of The Baryonic B Meson Decays B To D P Pbar 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 results for B-meson decay modes involving a charm meson, protons, and pions using 455 x 106 B{bar B} pairs recorded by the BABAR detector at the SLAC PEP-II asymmetric-energy ee− collider. The branching fractions are measured for the following ten decays: {bar B}° → D°p{bar p}, {bar B}° → D*°p{bar p}, {bar B}° → D+p{bar p}?−, {bar B}° → D*+p{bar p}?−, B− → D°p{bar p}?−, B− → D*°pp?−, {bar B}° → D°p{bar p}?−?+, {bar B}° → D*°p{bar p}?−?+, B− → D+p{bar p}?−?−, and B− → D*+p{bar p}?−?−. The four B− and the two five-body B° modes are observed for the first time. The four-body modes are enhanced compared to the three- and the five-body modes. In the three-body modes, the M(p{bar p}) and M(D{sup (*)0}p) invariant mass distributions show enhancements near threshold values. In the four-body mode {bar B}° → D+p{bar p}?−, the M(p?−) distribution shows a narrow structure of unknown origin near 1.5GeV/c2. The distributions for the five-body modes, in contrast to the others, are similar to the expectations from uniform phase-space predictions.
Observation Of Inclusive B Meson Decays Into Lambda C Baryons
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Author : ARGUS Collaboration
language : en
Publisher:
Release Date : 1988
Observation Of Inclusive B Meson Decays Into Lambda C Baryons written by ARGUS Collaboration and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.
Study Of B Meson Decays To Final States With A Single Charm Baryon
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Author : Stephanie A. Majewski
language : en
Publisher:
Release Date : 2007
Study Of B Meson Decays To Final States With A Single Charm Baryon written by Stephanie A. Majewski 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.
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)