6,259 research outputs found

    Future of Heavy Flavour Physics: Experimental Perspective

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    I discuss what measurements need to be done to search for physics beyond the Standard CKM model, rather than just what studies can be done in the near future. It is also important to accurately measure the CKM matrix elements. Current best estimates for two important elements are: |V_{cb}|=0.0381 +/- 0.0021 and |V_{ub}/V_{cb}|=0.085 +/- 0.019. Finally, future experiments are discussed.Comment: Presented at "Heavy Flavours 8," Southampton, UK, July 1999, 9 pages 7 figure

    Future B Experiments from The BTeV/LHC-b Perspective

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    Many measurements are necessary in the program of studying mixing, CP violation and rare decays of b and c quarks. These measurements require large numbers of B^o, B_s, B^- and D^{*+} hadrons. Fortunately, copius production of particles containing b and c quarks will occur at Tevatron and the LHC. The crucial measurements are described here, as well as the design of the two experiments, LHC-b and BTeV, that can exploit the 4-20 x 10^{11} b hadrons produced every 10^7 seconds.Comment: Presented at the 3rd International Conference on B Physics and CP Violation, Taipei, December 3-7, 1999 15 pages, 10 figure

    Experimental Status of BB Physics

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    A short summary is given of the current status of B physics. Reasons for physics beyond the Standard Model are discussed. Constraints on New Physics are given using measurements of B mixing, Bs mixing, and CP violation, along with |Vub. Future goals, and upcoming new experiments are also mentioned.Comment: Invited talk at X Mexican Workshop on Particles and Fields, Morelia, Michoacan, Mexico, Nov. 7-12, 2005; 16 pages and 12 figures; (added references

    Experimental Results in Heavy Flavor Physics

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    The interplay of experiment and theory is explored in the context of current data on b and c decay. Measurements of |Vcb| and |Vub| are extracted from existing data. Conservative estimates give |Vcb|=(42.4 +/- 1.2{exp} +/- 2.3{thy})x10^{-3} and |Vub|=(3.90 +/- 0.16{exp} +/- 0.53{thy})x10^{-3}. Using these values along with data on Bd, Bs mixing and CP violation in the K_{Long} system, the allowed region of the CKM parameters rho and eta is derived. Tests of factorization in two-body hadronic B decays to one heavy and one light meson are shown and compared with modern theories which are also used to see if there is new physics in two-body B decays to light mesons. The two new narrow D_{sJ} states, discovered by BaBar and CLEO, respectively, are interpreted in light of the observation of these states in B decays by Belle.Comment: Plenary talk at International Europhysics Conference on High Energy Physics EPS (July 17th-23rd 2003) in Aachen, Germany, 16 pages, 37 figures. Fixed Table 5 caption on Oct. 18 and errors on Nov. 5, 200

    Lifetimes of some bb-flavored hadrons

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    Recent measurements of lifetimes of some bb-flavored hadrons are presented and interpreted in the context of theoretical models, especially the Heavy Quark Expansion. Decay widths and decay width differences in the Bs0Bs0B_s^0-\overline{B}_s^0 system are discussed from studies of decays into the final states J/ψK+KJ/\psi K^+K^-, J/ψπ+πJ/\psi \pi^+\pi^-, Ds+DsD_s^+D_s^-, K+KK^+K^-, and Ds±πD_s^{\pm}\pi^{\mp}. Lifetime measurements of the baryons Λb0\Lambda_b^0, Ξb\Xi_b^-, Ξb0\Xi_b^0, and Ωb\Omega_b^- are also shown.Comment: Presented at 2014 Flavor Physics and CP Violation (FPCP-2014) Marselle, France, May 26-30, 2014;19 pages, 17 figures, to appear in the proceeding

    Pentaquarks and Tetraquarks at LHCb

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    Exotic resonant structures found in Λb0\Lambda^0_b and B0\overline{B}^0 decays into charmonium in the LHCb experiment are discussed. Examination of the J/ψpJ/\psi p system in Λb0J/ψKp\Lambda^0_b\to J/\psi K^- p decays shows two states each of which must be composed of uudccuudc\overline{c} quarks, and thus are called charmonium pentaquarks. Their masses are 4380±8±294380\pm 8\pm 29~MeV and 4449.8±1.7±2.54449.8\pm 1.7\pm 2.5~MeV, and their corresponding widths (Γ\Gamma) are 205±18±86205\pm 18\pm 86 MeV, and 39±5±1939\pm 5\pm 19 MeV. The preferred JPJ^P assignments are of opposite parity, with one state having spin 3/2 and the other 5/2. Models of internal binding of the pentaquark states are discussed. Finally, another mesonic state is discussed, the Z(4430)Z(4430)^- that decays into ψπ\psi' \pi^- and was first observed by the Belle collaboration in B0ψK+πB^0\to \psi' K^+\pi^- decays. Using a sample of approximately 25,000 signal events, LHCb determines the JPJ^{P} to be 1+1^{+}.Comment: 18 pages, 19 figures, presented at the European Physical Society Conference, Vienna Austria, July 22-19, and the DPF 2015 Meeting of the American Physical Society Division of Particles and Fields, Ann Arbor, Michigan, August 4-8, 201

    Pathological Science

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    I discuss examples of what Dr. Irving Langmuir, a Nobel prize winner in Chemistry, called "the science of things that aren't so." Some of his examples are reviewed and others from High Energy Physics are added. It is hoped that discussing these incidents will help us develop an understanding of some potential pitfalls.Comment: Presented at Theoretical Advanced Study Institute In Elementary Particle Physics (Tasi), University of Colorado, Boulder, Colorado June, 2000. To appear in the proceedings. (10/31/2000 - Fixed a reference.
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