Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session G03: Panofsky Prize and Future of B PhysicsInvited
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Sponsoring Units: DPF Chair: Priscilla Cushman, University of Minnesota Room: Sheraton Plaza E |
Sunday, April 14, 2019 8:30AM - 8:54AM |
G03.00001: Panofsky Prize in Experimental Particle Physics, Studies of Beauty and Charm Decays Invited Speaker: Sheldon L Stone Investigations of b quark decays started in 1980 with the discovery of the Y(4S) resonance by CLEO. This followed the discovery of the b-quark at Fermilab in 1977, by Lederman’s group. Almost from the very beginning there have been two themes associated with b decay studies. One is the measurement of standard model (SM) parameters, among them the magnitudes and phases of the quark mixing matrix (CKM matrix). The other far more reaching theme is to reveal or limit the presence of physics beyond the SM. New forces, represented by new particles would be exchanged in quantum loops present in decay diagrams of b-flavored hadrons, and these particles can affect decay rates, mixings, CP violation and decay angular distributions. In fact, it is somewhat surprising that we have not already unambiguously observed such phenomena. I will discuss progress in these two important directions, possible hints of new physics, and plans for the future. Important contributions from charm decay explorations will also be mentioned. |
Sunday, April 14, 2019 8:54AM - 9:18AM |
G03.00002: Dark Matter and Baryogenesis from B mesons. Invited Speaker: Ann Elizabeth Nelson The pattern of CP violation in in the interference between B meson mixing and decay supports the CKM theory of CP violation in the Standard Model. However the origin of the asymmetry between matter and anti-matter requires a source of CP or flavor-symmetry violation which is beyond the Standard Model, and is often used as a reason to study flavor physics and the physics of heavy quarks. I will discuss some work on possible scenarios where b-quarks are produced out of equilibrium in the early universe and hadronize before they decay, and how CP violation in the oscillations of neutral B mesons and/or baryons, combined with a new source of violation of visible baryon number violation, could produce the matter-anti-matter asymmetry and possibly also the dark matter. This possibility is directly testable via exotic decays of b-quarks, and via the charge asymmetry in B-meson oscillations. |
Sunday, April 14, 2019 9:18AM - 9:42AM |
G03.00003: Prospects for LHCb Invited Speaker: Daniel Craik With the beginning of the LHC Long Shutdown 2 this year, the LHCb experiment will be upgraded to equip the detector with a fully flexible software trigger and enable the collection of 50 fb-1 of data over the next ten years. Many key flavor observables will be measured to precisions sensitive to new physics effects. The collaboration envisions another major upgrade of the experiment to further extend the physics program in the HL-LHC era with the aim of collecting an additional 300 fb-1 of data. I will discuss both upgrades and highlight some of the future physics potential of LHCb. |
Sunday, April 14, 2019 9:42AM - 10:06AM |
G03.00004: Physics Prospects for Belle II Invited Speaker: Alan Jay Schwartz The Belle II experiment at the asymmetric e+e- SuperKEKB collider is a major upgrade of the Belle experiment, which ran at the KEKB collider at the KEK laboratory in Japan. The design luminosity of SuperKEKB is 40 times higher than that of KEKB, and the planned integrated luminosity is 50 times higher than that of Belle. Such a large data set allows for a broad physics program studying heavy B and D meson decays, and heavy tau lepton decays. Belle II will measure leptonic and semileptonic decays, radiative decays, inclusive decays, rare decays, CP-violating decays, and also search for forbidden decay channels. The good hermeticity of the detector and high acceptance facilitate measuring a wide range of observables. The sensitivity of the experiment to new physics should be much greater than that of the "B-factory" experiments Belle and Babar. In this talk we present the expected physics performance of Belle II. |
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