Conveners
Quarkonia: 1
- Miriam Fritsch (Univ. Mainz)
Quarkonia: 2
- Nora Brambilla (Physik Department, TU Munich)
Quarkonia: 3
- Simon Eidelman (Budker Institute of Nuclear Physics)
Quarkonia: 4
- Mikihiko Nakao (KEK)
Quarkonia: 5
- Bernhard Ketzer (TUM)
Description
Production, spectroscopy, and decay of quarkonia
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Prof. Marco Maggiora (INFN Torino)13/06/2011, 16:30QuarkoniatalkExperimental data in various channels show that in $J/\psi$ decay, strong and electromagnetic amplitudes seem to be orthogonal, while in the standard model they are expected to be both almost real. There has been the conjecture that the phase between strong and electromagnetic amplitudes is universally $-90^\circ$ in all decays of charmonium (quarkonium) $1^{--}$ states. However,...Go to contribution page
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Mr Jifeng HU (Graduate University of Chinese Academy of Sciences)13/06/2011, 16:50QuarkoniatalkIn this talk, we will present the results on the charmonium decays with the $J/\psi$ and $\psi^\prime$ data samples collected with the BESIII experiments at the BEPCII collider. With the world largest data samples at these two peaks, we observed for the first time many new decay modes of $J/\psi$, $\psi^\prime$, $\chi_{cJ}$, and $\eta_c$, we also improve the precisions of the branching...Go to contribution page
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Dr Liangliang WANG (Institute of High Energy Physics)13/06/2011, 17:10QuarkoniatalkIn this talk, we will present the results on the charmonium spin singlet states below the open charm threshold, including $h_c$, $\eta_c$, and $\eta_c(2S)$. The masses, widthes, and production rates of these states will be reported. The results are based on a data sample of 106 million $\psi^\prime$ events collected with the BESIII experiments at the BEPCII collider.Go to contribution page
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Mr Jorge Segovia (University of Salamanca)13/06/2011, 17:30QuarkoniatalkMeson strong decay is a complex non-perturbative process that has not been described from QCD first principles yet. Instead, several phenomenological models have been developed to deal with this topic, being the 3P0 [1], the flux-tube [2] and the Cornell [3, 4] models the most popular. To address a more fundamental description of the decay mechanism, one has to describe hadron strong decays...Go to contribution page
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Dr Hiroshi Noya (Institute of Physics, Hosei University at Tama)13/06/2011, 17:50QuarkoniatalkHiroshi Noya Institute of Physics, Hosei University at Tama Machida, Tokyo 194-0298, Japan e-mail : hiroshinoya@yahoo.com and Hiroshi Nakamura Department of Physics and Mathematics, College of Science and Engineering Aoyamagakuin University, Fuchinobe, Sagamihara, Kanagawa 229-8558, Japan We present the mass formula of the Diquark Cluster Model (DCM) to calculate the q２qbar2...Go to contribution page
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Prof. Kamal K. Seth (Nortwestern University)14/06/2011, 14:30QuarkoniatalkRecent results from CLEO in the spectroscopy of charmonium and bottomonium are presented. These include recent measurements of spin-singlet states in quarkonia, precision measurements of branching fractions for radiative and hadronic decays, and higher multipoles in radiative decays, among others.Go to contribution page
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Mr Piotr Pietrulewicz (Technische Universitaet Muenchen)14/06/2011, 14:55QuarkoniatalkIn this talk we will present the theoretical treatment of heavy quarkonia electric dipole transitions within an effective field theory formalism. Inside the effective field theory called potential nonrelativistic QCD (pNRQCD) we will account for the relativistic corrections to the decay rate in a systematic and model independent way. Former results from potential model calculations will be...Go to contribution page
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Dr Simon Eidelman (Budker Institute of Nuclear Physics)14/06/2011, 15:15QuarkoniatalkWe present recent results from the KEDR detector operating at the e+e- collider VEPP-4M in Novosibirsk. They include a high-precision measurement of the J/psi and psi(2S) masses, a study of the psi(2S) and psi(3770) parameters, a determination of the branching fraction B(J/psi -> eta_c gamma), a test of lepton universality in J/psi decays, a measurement of the leptonic width for the psi(2S)...Go to contribution page
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Dr Mikhail Barabanov (Joint Institute for Nuclear Research)14/06/2011, 15:35QuarkoniatalkThe study of strong interactions and hadronic matter in the process of antiproton-proton annihilation seems to be a challenge nowadays. The research of charmonium (the system consisting of charmed quark-antiquark pair cc\bar), charmed hybrids (the system consisting of charmed quark-antiquark pair strongly interacting with gluonic component cc\barg) spectra and their main characteristics: mass,...Go to contribution page
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Claudia Patrignani (University and INFN Genova)14/06/2011, 16:30QuarkoniatalkWe present a study of the radiative transitions from decays of the Y(2S) and Y(3S) resonances using photons that have converted into an e+e- pair, obtaining precise measurements of the branching fractions for chi_b1,2(1, 2P) --> gamma Y(1S) and chi_b1,2(2P) -->gamma Y(2S) transitions and search for radiative decay to the eta_b(1S) and eta_b(2S) states. We present a search for the...Go to contribution page
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Dr Alexander Kuzmin (BINP)14/06/2011, 16:50QuarkoniatalkOriginally designed for CP violation studies in the B meson system, the B-Factories recently showed an exciting capability for improving our experimental knowledge in the field of hadron spectroscopy. We review results on bottomonium spectroscopy by the Belle experiment at the KEK-B e+e- collider and present exciting new results from the unique large data set taken at the Y(5S) resonance.Go to contribution page
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Alexander Laschka (TU München)14/06/2011, 17:10QuarkoniatalkThe heavy quark-antiquark potential is accessible in perturbative QCD and in lattice simulations. The perturbative short-distance part of the potential is contructed via a restricted Fourier transform, covering the momentum region where perturbative QCD is applicable. We show that for the leading order static term as well as for the mass dependent corrections, the perturbative part can be...Go to contribution page
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Giovanni Sabatino (INFN - Rome 2)14/06/2011, 17:30QuarkoniatalkLHCb is one of the four LHC experiments which started data-taking in 2010 at a centre-of-mass energy of 7 TeV. The detector is a forward spectrometer dedicated to the study of B production and decay. Efficient tracking and muon identification allow precision measurement of quarkonia states to be performed. We present studies of the production of resonances in the dimuon sample collected in the...Go to contribution page
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Bora Akgun (Carnegie Mellon University)14/06/2011, 17:50QuarkoniatalkThis talk presents the quarkonium differential cross sections, as a function of transverse momentum and in several rapidity ranges, measured by CMS in pp collisions at 7 TeV. In particular, results will be presented for the J/psi and psi(2S) states as well as for the Υ(1S), Υ(2S) and Υ(3S). We will also provide first results regarding the production of the chi_c states and of the X(3872)...Go to contribution page
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Dr Javier Vijande (Univ. Valencia)16/06/2011, 14:30QuarkoniatalkWe perform a systematic analysis of doubly charmed exotic states as meson-meson molecules [1]. We compare our results with those previously obtained within the hyperspherical harmonic formalism[2]. Several relevant conclusions have to be emphasized. First of all, the conclusive existence of a stable isoscalar doubly charmed meson with quantum numbers $(I)J^P=(0)1^+$. This state could be...Go to contribution page
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Dr Sören Lange (Universität Giessen)16/06/2011, 14:55QuarkoniatalkWe present the results of recent charmonium studies with the Belle experiment. These studies include the determination of eta_c and eta_c(2S) parameters in B decays and new results on X(3872), including its radiative decays, mass and width determination, angular analysis for its quantum number determination.Go to contribution page
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Valentina Santoro (INFN Ferrara)16/06/2011, 15:15QuarkoniatalkWe present a search for the X(3872) produced in B-->psi pi+pi- K and B-->psi pi+pi-pi0 K (psi=J/psi or psi(2S)) using 427 fb-1 of BaBar data. We present updated mass and width measurements for the Y(4260)--> J/psi pi+pi- produced in Initial State Radiation events using 454 fb-1 of data. We report the study of the B meson decays B+--> J/psi phi K+ and B0--> J/psi phi K_S, and of charged...Go to contribution page
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David Rodriguez Entem (University of Salamanca)16/06/2011, 15:35QuarkoniatalkThe discovery of the $J/\psi$ meson in 1974 was the experimental confirmation of the existence of the charmed quark introduced theoretically in 1970 by Glashow, Iliopoulus and Maiani to explain the cancellation of loop diagrams in $K^0$ weak decays. Consisting of a charmed $c$ quark and a $\bar c$ antiquark the $J/\psi$ particle became the starting point of a whole family of bound states...Go to contribution page
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Mr Bo Liu (Center for High Energy Physics, Tsinghua University)16/06/2011, 16:30QuarkoniatalkThe last ten years have seen a resurgence of interest in exotic spectroscopy driven by the discovery of the X(3872) in the J/ψππ spectrum. Searches and studies of exotic quarkonia form an important part of LHCb's physics programme. We present results for the production of ψ(2S) and χc(1,2) in the dimuon plus pions or photon channels, as well as the first results for X(3872) production using...Go to contribution page
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Jian Wang (Institute of High Energy Physics)16/06/2011, 16:55QuarkoniatalkA measurement of the ratio of $X(3872)$ and $\psi(2S)$ signal yields in $pp$ collisions at 7 TeV is presented, using data recorded at the CMS experiment in 2010 corresponding to an integrated luminosity of 36pb-1. The events are reconstructed decays into $J/\psi \pi^+ \pi^-$ and subsequent decay of the $J/\psi$ candidates into two muons. The measured ratio is compared to theoretical expectations.Go to contribution page
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Mr Frederick Kramer (IKF Uni Frankfurt)16/06/2011, 17:20QuarkoniatalkALICE is the dedicated heavy-ion physics experiment at the Large Hadron Collider (LHC). It is designed to provide excellent capabilities to study the Quark-Gluon Plasma (QGP), the deconfined state of strongly-interacting matter, in the highest energy density regime opened up by the LHC. Quarkonia, bound states of heavy (charm or bottom) quarks such as the J/ψ, are crucial probes of the QGP in...Go to contribution page
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Mr Jacopo Ghiglieri (TUM)16/06/2011, 17:45QuarkoniatalkWe develop a Non-Relativistic Effective Field theory approach for heavy quarkonium at finite temperature. Such a framework is based on the T=0 one of NRQCD and pNRQCD. Within this approach we calculate the heavy quarkonium energy levels and decay widths in a quark- gluon plasma whose temperature is much smaller than the inverse radius of the bound state. This is achieved by subsequently...Go to contribution page