Bulletin of the American Physical Society
APS April Meeting 2015
Volume 60, Number 4
Saturday–Tuesday, April 11–14, 2015; Baltimore, Maryland
Session J16: Heavy Quark Physics |
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Sponsoring Units: DPF Chair: Ian Shipsey, University of Oxford Room: Key 12 |
Sunday, April 12, 2015 10:45AM - 10:57AM |
J16.00001: Galilean-Invariant XEFT Eric Braaten XEFT is a low-energy effective field theory for charm mesons and pions that can be used to describe the $X(3872)$ resonance. A Galilean-invariant formulation of XEFT is introduced to exploit the fact that mass is very nearly conserved in the transition $D^{*0} \to D^0 \pi^0$. The transitions $D^{*0} \to D^0 \pi^0$ and $D^{*0} \bar D^0 \to D^0 \bar D^0 \pi^0$ are described explicitly in XEFT. The effects of the decay $D^{*0} \to D^0 \gamma$ and of short-distance decay modes of the $X(3872)$, such as $J/\psi\, \pi^+ \pi^-$, can be taken into account by using complex on-shell renormalization schemes for the $D^{*0}$ and the $D^{*0} \bar D^0$ propagators. Galilean-invariant XEFT should facilitate accurate calculations of the properties of the $X(3872)$ resonance. [Preview Abstract] |
Sunday, April 12, 2015 10:57AM - 11:09AM |
J16.00002: Observation of $B^{+}\to \psi (2S)\varphi K^{+}$ Reddy Pratap Gandrajula The high luminosity and large cross section for b-quark production at the LHC makes possible the observation and study of many rare B meson decays. Recently, CMS reported on the presence of substructures in the known decay $B^{+}\to J/\psi \varphi K^{+}$. As part of that investigation, the final state $B^{+}\to \psi (2S)\varphi K^{+}$ , with $\psi (2S)\to \mu^{+}\mu ^{-}$and $\varphi \to K^{+}K^{-}$was also observed. We report the signal, with a significance of over 5 standard deviations using 19.6 $fb^{-1}$ data collected at $\surd $s $=$ 8 TeV at CMS, and its branching fraction measurement. [Preview Abstract] |
Sunday, April 12, 2015 11:09AM - 11:21AM |
J16.00003: Radiative Transitions of the Y(4260) at BES III Manuel Lara The recent discoveries of the so called ``XYZ'' states are beginning to open new possibilities for how quarks can interact and bind. Detailed studies of their decays are underway in many facilities like the BES detector which has collected a over 4 fb$^{-1}$ of data at energies between 4.01 to 4.6 GeV to study decays of Y(4260). While the nature of the Y(4260) is still unknown two particularly important decay channels to study would be radiative decays to $\eta_{c}$ and $\chi_{c0}$, because their branching fraction ratio could be compared to existing E1/M1 branching fractions of conventional charmonium and to lattice qcd predictions. The prospects for measuring such transitions using data collected with the BES detector will be presented. [Preview Abstract] |
Sunday, April 12, 2015 11:21AM - 11:33AM |
J16.00004: Double Quarkonium Production at CMS Maksat Haytmyradov Quarkonium production has long been considered as an ideal means of investigating QCD and other new phenomena. The first simultaneous production of two J/$\psi$-mesons was observed in 1982 by NA3 collaboration, and later it was followed by the LHCb and CMS collaboration. At NA3, the main contribution to the cross section arises from the quark-antiquark annihilation channel. On the contrary, gluon-gluon scattering is dominant at the Tevatron and the LHC colliders. We present the studies of double quarkonium production in 20.7 $fb^{-1}$ integrated luminosity in proton-proton collisions at s = 8 TeV. Both quarkonia are fully reconstructed from $\mu^{+} \mu^{-}$ pairs, and investigations of their production through double parton (DPS) and single parton (SPS) scattering processes [Preview Abstract] |
Sunday, April 12, 2015 11:33AM - 11:45AM |
J16.00005: Forward/Backward Asymmetry Measurements at D0 Bruce Hoeneisen The D0 experiment reports three forward/backward asymmetry measurements in proton-antiproton collisions at the Fermilab Tevatron collider. We have measured the forward/backward asymmetry for the production of $B^{\pm}$ mesons, for $\Lambda_b$ baryons, and for $\Lambda$ baryons. All measurements use the full D0 RunII dataset. [Preview Abstract] |
Sunday, April 12, 2015 11:45AM - 11:57AM |
J16.00006: Potential-model implications of the charmed strange states at 2860 MeV Walter Jaronski Recently, the CERN LHCb collaboration has reported that the charmed strange resonance at 2860 MeV is an admixture of 1$^{-}$ and 3$^{-}$ states of nearly equal mass.\footnote{LHCb Collaboration, R. AAij \textit{et al., Observation of overlapping spin-1 and spin-3} $\bar{D}^0K^-$ \textit{resonances at mass 2.86 GeV/c}$^{2}$, arXiv:1407.7574} This has possible implications regarding the relative strengths of the spin-orbit and tensor interactions, as well as on the Lorentz nature of the potential. The charmed strange meson system, with its heavy charmed quark and with no truly light valence quarks, is a useful system in which to explore effective quark potentials. Model calculations are presented in which the masses of all known charmed strange mesons are used to obtain information about the potential and its Lorentz nature. [Preview Abstract] |
Sunday, April 12, 2015 11:57AM - 12:09PM |
J16.00007: First observation and studies of the simultaneous production of $J/\psi$ and $\Upsilon$ at the Tevatron Olga Gogota We present the first observation of the simultaneous production of $J/\psi$ and $\Upsilon$ mesons with the D0 detector at Fermilab in $p \bar p$ collisions at $\sqrt{s}=1.96$ TeV. The production cross section for both singly and simultaneously produced mesons is measured using a sample with an integrated luminosity of 8.1 fb$^{-1}$. The simultaneous production cross section is separated into contributions due to single- and double-parton scatterings. Using these measurements, we determine the effective cross section $\sigma_{eff}$, a parameter characterizing an effective spatial area of the parton interactions and related to the parton spatial density inside the nucleon. [Preview Abstract] |
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