Download or read book Study of B Meson Decays to Final States with a Single Charm Baryon written by and published by . This book was released on 2007 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Study of B meson Decays to Final States with a Single Charm Baryon written by Stephanie A. Majewski and published by . This book was released on 2007 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Observation of Exclusive B Meson Decays to Final States Containing a Charmed Baryon written by John Joseph O'Neill (Ph. D. in physics) and published by . This book was released on 1996 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Study of B Meson Decays to Ppbarh Final States written by Tetiana B. Hryn'ova and published by . This book was released on 2006 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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}.

Download or read book Study of B Decays to Open Charm Final States With the BaBar Experiment written by and published by . This book was released on 2011 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent results from the BaBar Collaboration in the sector of B decays to open Charm are presented. Some of the results represent new precision measurements and QCD tests, some other analysis is aimed to the study of rare decays and search for new physics. Branching fractions for the modes observed for the first time are highlighted. A few results are presented also in the baryon sector.

Download or read book Charmless Hadronic B Decays at Belle and BaBar written by and published by . This book was released on 2011 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: I report on recent measurements from the Belle and BABAR collaborations on the decay of the B meson to hadronic final states without a charm quark. The study of the branching fractions and angular distributions of B meson decays to hadronic final states without a charm quark probes the dynamics of both the weak and strong interactions, and plays an important role in understanding CP Violation (CPV) in the quark sector. CP Violation at the B factories is described graphically by a triangle with sides formed from the CKM matrix elements V{sub qd}V*{sub qb} (q = u, c, t) and internal angles [alpha], [beta] [gamma] (or [phi]2, [phi]1, [phi]3). Discrepancies in the measured values of the sides and angles could be an indication of New Physics beyond the Standard Model (SM) due to enhanced branching fractions or modified CP asymmetries. The experimental measurements of branching fractions, CP asymmetries, polarization and phases (both weak and strong) can be compared to theoretical models based on, for example, QCD factorization, SU(3) symmetry and Lattice QCD.

Download or read book Observation and Study of the Baryonic B meson Decays B to D P Pbar written by and published by . This book was released on 2012 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Study of B Meson Decays to Pp h Final States written by Tetiana B. Hryn'ova and published by . This book was released on 2006 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Precision Tests Of The Standard Electroweak Model written by Paul G Langacker and published by World Scientific. This book was released on 1995-02-23 with total page 1032 pages. Available in PDF, EPUB and Kindle. Book excerpt: High precision measurements of weak neutral current and charged current processes and of the properties of the Z and W bosons have established the standard electroweak model as correct down to a distance scale of 10-16 cm, and are a sensitive probe of possible underlying physics. In this book, all aspects of the program are considered in detail, including the structure of the standard model, radiative corrections, high precision experiments, and their implications. The major classes of experiments are surveyed, covering the experiments themselves, the data analysis, results, and prospects.This volume is a detailed reference for theoretical and experimental researchers, as well as an introductory text for advanced students.

Download or read book Investigation of Semileptonic B Meson Decay to P Wave Charm Mesons written by and published by . This book was released on 2003 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have studied semileptonic B meson decays with a P-wave charm meson in the final state using 3.29 x 106 B{bar B} events collected by the CLEO II detector at the Cornell Electron-positron Storage Ring. We find a value for the exclusive semileptonic product branching fraction:?(B− → D1°l−{bar {nu}}{sub l})?(D1° → D*?−) = (0.373 ± 0.085 ± 0.052 ± 0.024)% and an upper limit for?(B− → D*2°l−{bar {nu}}{sub l})?(D*2° → D*+?−)

Download or read book A Search for Charmless Baryonic B Meson Decays at CLEO written by Eric Ashton Eckhart and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: We search for the decays of $B$ mesons to charmless final states involving a baryon and an anti-baryon using 9.2 fb -1 of e + e - annihilation data taken on the?(4s) resonance with the CLEO II and CLEO II. V detectors, and 6.2 fb -1 from CLEO III. We perform an extended maximum likelihood analysis of the data to determine signal yields. We report an observation of the decay mode B - -> p anti-p K - and measure its branching fraction to be (5.88 +2.86 -2.21 (stat.) +1.12 -0.19 (syst.)) x 10 -6 . We find no statistically significant signals for our other modes and establish 90% C.L. upper limits of BR(B -> p anti-p) 1.4 x 10 -6, BR(B - anti-p?) 1.5 x 10 -6, BR(B -? anti-?) 1.2 x 10 -6, and BR(B - anti-p?p +)

Download or read book B Decays to Charm States at BABAR written by and published by . This book was released on 2004 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this paper recent results in the field of B meson decays to states containing charm are presented. These analyses are based on the 1999-2003 dataset collected by the BABAR experiment at the PEP-II ee− storage ring at the Stanford Linear Accelerator Center. Special attention is devoted to B decays to final states containing D mesons. In addition a few new results from B decays to charmonium states are reported.

Download or read book Observation And Study of B Meson Decays with Lambda C Baryons with the BaBar Detector written by and published by . This book was released on 2013 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book B Decays written by Sheldon Stone and published by World Scientific. This book was released on 1994 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 2nd edition is an extensive update of "B Decays?. The revisions are necessary because of the extensive amount of new data and new theoretical ideas. This book reviews what is known about b-quark decays and also looks at what can be learned in the future.The importance of this research area is increasing, as evidenced by the approval of the luminosity upgrade for CESR and the asymmetric B factories at SLAC and KEK, and the possibility of experiments at hadron colliders.The key experimental observations made thus far, measurement of the lifetimes of the different B species, B0-B0 mixing, the discovery of ?Penguin? mediated decays, and the extraction of the CKM matrix elements Vub and Vcb from semileptonic decays, as well as more mundane results, are described in great detail by the experimentalists who have been closely involved with making the measurements. Theoretical progress in understanding b-quark decays using HQET and lattice gauge techniques are described by theorists who have developed and used these techniques.Synthesizing the experimental and theoretical information, several articles discuss the implications for the ?Standard Model? and how further tests can be done using measurements of CP violation in the B system.

Download or read book Particle Physics Perspectives And Opportunities Report Of The Dpf Committee On Long term Planning written by Robert N Cahn and published by World Scientific. This book was released on 1995-09-20 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the result of a broad-based and in-depth study of high energy physics commissioned by the Executive Committee of the Division of Particles and Fields of the American Physical Society. This year-long study was initiated in the early 1994, in the wake of the cancellation of the SSC, and is meant to complement the report of the Drell HEPAP subpanel, charged with providing a vision for the future of the field. The DPF study of high energy physics was organized on the basis of the working groups, each led by a number of co-conveners chosen among established leaders in the various subspecialties in the field. These conveners, in turn, organized their working groups by inviting other active workers in the discipline to participate and gathered further input from the community by holding a variety of specialized meetings and workshops. This book contains the final reports of the 11 working groups assembled for the study, along with an extended overview and executive summary by the editors.

Download or read book Analysis of Charm Meson Semiliptonic Decays and Charm Baryon High Mass States written by Luca Cinquini and published by . This book was released on 1996 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hadronic Decays to Double Charm Final States written by Sergio Grancagnolo and published by . This book was released on 2005 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work is based on the analysis of the data collected at the BaBar experiment on the PEP-II collider at SLAC (Stanford Linear Accelerator Center, California) between 1999 and 2002. The data sample collected corresponds at 122.1 ± 0.6 ± 1.3 millions of BBbar pairs. The observation by BaBar of the DsJ*(2317)+ and DsJ(2460)+ mesons, discovered in 2003, raised a lot of interest for the spectroscopy of charmed hadrons. l reviewed theoretical explanations and recent experimental results. In the first part of the thesis , l studied the reconstruction efficiency of low energy pions produced in the D* meson decay. In the second part I studied the production of the new DsJ particles in the hadronic decays of the B meson with two charm quarks. To reach this goal l developed the technique to reconstruct the decays B-->DsJD(*). After clear evidence of signal on all the decay modes under study (some of them seen for the first time in the world !), l estimated the number of signal events and l computed the corresponding branching ratios, after background rejection, reconstruction efficiency evaluatlon and systematic errors estimation. The order of magnitude of the branching ratios is 10/\-3; these values are slightly smaller than the corresponding of the decays B-->DsD(*) , expected of the same order in the factorisatlon hypothesis. Using angular analysis l measured the quantum numbers of DsJ(2460)+, obtaining a result compatible with the hypothesis JP=1+