Latest content added for Digital Libraryhttps://digital.library.unt.edu/search/?sort=added_a&=&t5=dc_subject&q5=%22B+Mesons%22&searchType=advanced2015-06-16T07:43:17-05:00UNT LibrariesThis is a custom feed for searching Digital LibraryHighlights of B physics at CDF2015-06-16T07:43:17-05:00https://digital.library.unt.edu/ark:/67531/metadc618350/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc618350/"><img alt="Highlights of B physics at CDF" title="Highlights of B physics at CDF" src="https://digital.library.unt.edu/ark:/67531/metadc618350/small/"/></a></p><p>The CDF experiment at the Fermilab Tevatron collider has produced many B physics results. Recent measurements on B meson masses, B lifetimes, B branching ratios, limits on rare B decays, and B flavour tagging studies are reviewed.</p>Weak matrix elements on the lattice - Circa 19952015-06-16T07:43:17-05:00https://digital.library.unt.edu/ark:/67531/metadc618282/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc618282/"><img alt="Weak matrix elements on the lattice - Circa 1995" title="Weak matrix elements on the lattice - Circa 1995" src="https://digital.library.unt.edu/ark:/67531/metadc618282/small/"/></a></p><p>Status of weak matrix elements is reviewed. In particular, e{prime}/e, B {yields} K*{gamma}, B{sub B} and B{sub B}, are discussed and the overall situation with respect to the lattice effort and some of its phenomenological implications are summarised. For e{prime}/e the need for the relevant matrix elements is stressed in view of the forthcoming improved experiments. For some of the operators, (e.g. O{sub 6}), even bound on their matrix elements would be very helpful. On B {yields} K{degrees}{gamma}, a constant behavior of T{sub 2} appears disfavored although dependence of T{sub 2} could, of course, be milder than a simple pole. Improved data is badly needed to settle this important issue firmly, especially in view of its ramification for extractions of V{sub td} from B {yields} {rho}{gamma}. On B{sub {kappa}}, the preliminary result from JLQCD appears to contradict Sharpe et al. JLQCD data seems to fit very well to linear {alpha} dependence and leads to an appreciably lower value of B{sub {kappa}}. Four studies of B{sub {kappa}} in the {open_quotes}full{close_quotes} (n{sub f} = 2) theory indicate very little quenching effects on B{sub {kappa}}; the full theory value seems to be just a little less than the quenched result. Based on expectations from HQET, analysis of B-parameter (B{sub h}{ell}) for the heavy-light mesons via B{sub h}{ell}) = constant + constants{prime}/m{sub h}{ell} is suggested. A summary of an illustrative sample of hadron matrix elements is given and constraints on CKM parameters (e.g. V{sub td}/V{sub ts}, on the unitarity triangle and on x{sub s}/x{sub d}, emerging from the lattice calculations along with experimental results are briefly discussed. In quite a few cases, for the first time, some indication of quenching errors on weak matrix elements are now becoming available.</p>Hadronic Charmless B Decays at the SLD2015-06-16T07:43:17-05:00https://digital.library.unt.edu/ark:/67531/metadc623777/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc623777/"><img alt="Hadronic Charmless B Decays at the SLD" title="Hadronic Charmless B Decays at the SLD" src="https://digital.library.unt.edu/ark:/67531/metadc623777/small/"/></a></p><p>Rare decays of beauty particles were studied in several two-body exclusive hadronic charmless modes using the 19.4 pb<sup>-1</sup> Z-pole data collected with the SLD detector at SLAC from 1993 to 1998. These decays are mediated by both tree level b {yields} u and one-loop penguin b {yields} s, d transitions. Upper limits for the branching ratios are set for the investigated modes B<sub>s</sub>, B<sub>0</sub> {yields} P<sup>+</sup>P<sup>-</sup>, B<sup>+</sup> {yields} V P<sup>+</sup> and B<sub>s</sub>, B<sup>0</sup> {yields} V V , where the pseudoscalar particle P<sup>+</sup> is either {pi}<sup>+</sup> or K<sup>+</sup> and the vector particle V is either {rho}<sup>0</sup>, K<sup>* 0</sup> or {phi}. Using an event selection algorithm consisting of a set of hard cuts combined with a set of discriminator functions, the efficiencies range between 24% and 37% with near zero background.</p>Impedance study for the PEP-II B-factory2015-06-16T07:43:17-05:00https://digital.library.unt.edu/ark:/67531/metadc623666/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc623666/"><img alt="Impedance study for the PEP-II B-factory" title="Impedance study for the PEP-II B-factory" src="https://digital.library.unt.edu/ark:/67531/metadc623666/small/"/></a></p><p>The paper summarizes results of the impedance studies of the components of the B-factory. The prime goal of this activity was to support the design of the vacuum chamber and, at the same time, to get a reasonable model of the machine impedance, which can be used later for detail studies of collective effects.</p>Trojan Penguins and Isospin Violation in Hadronic B Decays2015-06-16T07:43:17-05:00https://digital.library.unt.edu/ark:/67531/metadc624674/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc624674/"><img alt="Trojan Penguins and Isospin Violation in Hadronic B Decays" title="Trojan Penguins and Isospin Violation in Hadronic B Decays" src="https://digital.library.unt.edu/ark:/67531/metadc624674/small/"/></a></p><p>Some rare hadronic decays of B mesons, such as B {yields} {pi}K, are sensitive to isospin-violating contributions from physics beyond the Standard Model. Although commonly referred to as electroweak penguins, such contributions can often arise through tree-level exchanges of heavy particles, or through strong-interaction loop diagrams. The Wilson coefficients of the corresponding electroweak penguin operators are calculated in a large class of New Physics models, and in many cases are found not to be suppressed with respect to the QCD penguin coefficients. Several tests for these effects using observables in B{sup {+-}} {yields} {pi}K decays are discussed, and nontrivial bounds on the couplings of the various New Physics models are derived.</p>Production of J/{Psi} from {chi}{sub c} decays at CDF2015-06-16T07:43:17-05:00https://digital.library.unt.edu/ark:/67531/metadc623855/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc623855/"><img alt="Production of J/{Psi} from {chi}{sub c} decays at CDF" title="Production of J/{Psi} from {chi}{sub c} decays at CDF" src="https://digital.library.unt.edu/ark:/67531/metadc623855/small/"/></a></p><p>We have measured the fraction of J/{psi} originating from {chi}{sub c} states in p{bar p} collisions at {radical}s = 1.8 TeV in four bins of J/{psi} P{sub T}. The fraction in the inclusive CDF J/{psi} sample with P{sub T}{sup J/{psi}} > 4.0 GeV/c and {vert_bar}{eta}{sup J/{psi}}{vert_bar} < 0.6 is f{sub x}{sup J/{psi}} = 28.3{+-}1.6(stat){+-}6.8(syst)%. The fraction of J/{psi} from {chi}{sub c} not including contributions from B{yields}J/{psi}. X and B {yields} {chi}{sub c} X is f(Nob){chi}{sup J/{psi}} = 32.3{+-}2.0(stat){+-}8.5(syst)%. We have also found that directly produced {chi}{sub c}`s are produced in the ratio = {sigma}({chi}{sub c2}) over {sigma}({chi}{sub cl}) + {sigma}({chi}{sub c2})= 0.47{+-}0.08(stat){+-}0.02(syst.)</p>The PEP-II design2015-06-16T07:43:17-05:00https://digital.library.unt.edu/ark:/67531/metadc626147/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc626147/"><img alt="The PEP-II design" title="The PEP-II design" src="https://digital.library.unt.edu/ark:/67531/metadc626147/small/"/></a></p><p>The Stanford Linear Accelerator Center (SLAC), Lawrence Berkeley Laboratory (LBL), Lawrence Livermore National Laboratory (LLNL) Positron Electron Project-II (PEP-II) is a design for a high-luminosity, asymmetric energy, electron-positron colliding beam accelerator that will operate at the center-of-mass energy of the {Upsilon}4S (10.58 GeV). The goal of the design is to achieve a large enough integrated luminosity with a moving center-of-mass reference frame to he able to observe the predicted rare decay modes of the {Upsilon}4S that do not conserve charge parity (CP).</p>Test of CPT Invariance in B Factories2015-06-16T07:43:17-05:00https://digital.library.unt.edu/ark:/67531/metadc626202/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc626202/"><img alt="Test of CPT Invariance in B Factories" title="Test of CPT Invariance in B Factories" src="https://digital.library.unt.edu/ark:/67531/metadc626202/small/"/></a></p><p>Feasibility of setting limits on CPT violating parameters for the case of both CP conjugate and semileptonic decays of neutral Bd mesons were examined. For the case of semileptonic final states of neutral Bd meson decays, bounds on CPT violating parameters at the level of few percent can be easily obtained. This sensitivity is better than the similar analysis using the CP conjugate final states of neutral Bd meson decays mainly due to the substantial increase on the statistics.</p>Measurement of the B{sup +} and B{sup 0} lifetimes at CDF2015-06-16T07:43:17-05:00https://digital.library.unt.edu/ark:/67531/metadc625215/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc625215/"><img alt="Measurement of the B{sup +} and B{sup 0} lifetimes at CDF" title="Measurement of the B{sup +} and B{sup 0} lifetimes at CDF" src="https://digital.library.unt.edu/ark:/67531/metadc625215/small/"/></a></p><p>Two measurements of the lifetime of neutral and charged B mesons in p{bar p} collisions at {radical}s = 1.8 TeV by the CDF experiment are presented. The first relies on the study of exclusive decays of the type B {yields} {psi} K, the second on semileptonic decays of a B meson into a D{degrees} or a D. The combined results are {tau}(B{sup +}) = 1.62 {+-} 0.09 ps, {tau}(B{sub 0}) = 1.60 {+-} 0.09 ps and {tau}(B{sup +})/{tau}(B{sup 0}) = 1.00 {+-} 0.07.</p>CDF B spectroscopy results: B** and Bc{sup +}2015-06-16T07:43:17-05:00https://digital.library.unt.edu/ark:/67531/metadc625111/<p><a href="https://digital.library.unt.edu/ark:/67531/metadc625111/"><img alt="CDF B spectroscopy results: B** and Bc{sup +}" title="CDF B spectroscopy results: B** and Bc{sup +}" src="https://digital.library.unt.edu/ark:/67531/metadc625111/small/"/></a></p><p>The authors report on two spectroscopy results from CDF. First, they observe the orbitally excited B** mesons in B {r_arrow} {ell}D(*) X events. They find 28 {+-} 6 {+-} 3% of light B mesons produced are B** states. A collective mass fit results in a B{sub 1} mass of 5.71 {+-} 0.02 GeV/c{sup 2}. Secondly, they observe 20.4{sub {minus}5.5}{sup +0.18} {+-} 0.03 ps lifetime. The production rate is in reasonable accordance with expectations.</p>