Author: Adrian H. ChoPublisher:
ISBN:
Category :
Languages : en
Pages : 524
Book Description
A Study of Lower Vertex Production of D3 Mesons in B Meson Decays
Author: Adrian H. ChoOn Production of D and D* Mesons in B-meson Decays
Author: M. A. ShifmanThe Production of Excited Charm Mesons in Semileptonic B Decay
Author: Leo BellantoniStudies of Excited D Mesons in B Meson Decays
Author: Charlotte WallacePublisher:
ISBN:
Category : Beta decay
Languages : en
Pages : 344
Book Description
Study of B Meson Decays to Ppbarh Final States
Author: Tetiana B. Hryn'ovaPublisher:
ISBN:
Category :
Languages : en
Pages : 165
Book Description
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}.
Study of B-Meson Decays to Final States with a Single Charm Baryon
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 208
Book Description
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.
Study of B Meson Decays with Excited Eta and Eta-prime Mesons
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 7
Book Description
Using 383 million B{bar B} pairs from the BABAR data sample, they report results for branching fractions of six charged B-meson decay modes, where a charged kaon recoils against a charmless resonance decaying to K{bar K}* or [eta][pi][pi] final states with mass in the range (1.2-1.8) GeV/c2. They observe a significant enhancement at the low K{bar K}* invariant mass which is interpreted as B 2K, find evidence for the decay B+ 2K+, and place upper limits on the decays B+ 2K+, B+ 2!f1(1285)K+, B+ 2!f1(1420)K+, and B+ 2K+.
Study of Inclusive Production of Charmonium Mesons in B Decay
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 17
Book Description
The inclusive production of charmonium mesons in B meson decay has been studied in a 20.3 fb−1 data set collected by the BABAR experiment operating at the [Upsilon](4S) resonance. Branching fractions have been measured for the inclusive production of the charmonium mesons J/[psi], [psi](2S), [chi]{sub c1}, and [chi]{sub c2}. The branching fractions are also presented as a function of the center-of-mass momentum of the mesons and of the helicity of the J/[psi].
Studies on B-Meson Decays
Author: Hluf Negash GebrehiwetPublisher: LAP Lambert Academic Publishing
ISBN: 9783659648977
Category :
Languages : en
Pages : 56
Book Description
This is written by Hluf Negash which studies the decays of B-meson in the framework of Bethe-Salpeter equation under covariant instantaneous ansatz. The analysis of this study gives important information about the internal structure of hadrons. The prediction of the properties of strongly interacting particles using the mesonic and baryonic sectors is of great importance since these hadrons can be easily produced in experiments and hence the theoretical predictions can be veri ed.
All Hadronic B Decay Trigger with the CDF Silicon Vertex Tracker
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Silicon Vertex tracks are of fundamental importance for reconstructing B meson decays at a hadron collider. The upgraded CDF detector will deploy an online Silicon Vertex Tracker in the level 2 trigger. We have studied how this new device exploits the Tevatron large B meson production to select hadronic B decays fundamental for measuring CP violation and B{sub s} mixing.