1,401 research outputs found

    Charmonium levels near threshold and the narrow state X(3872) \to \pi^{+}\pi^{-}\jpsi

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    We explore the influence of open-charm channels on charmonium properties, and profile the 1:3D2, 1:3D3 and 2:1P1 charmonium candidates for X(3872). The favored candidates, the 1:3D2 and 1:3D3 levels, both have prominent radiative decays. The 1:3D2 might be visible in the D0DňČ‚ąó0D^{0}\bar{D}^{*0} channel, while the dominant decay of the 1:3D3 state should be into DDňČD\bar{D}. We propose that additional discrete charmonium levels can be discovered as narrow resonances of charmed and anticharmed mesons.Comment: 8 pages, 6 figures, uses RevTeX and boxedeps; few transcription errors corrected in Tables IV and VI, three entries added in Table V, updated references. Version to appear in Phys. Rev.

    The Isgur-Wise Limit on the Lattice

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    We construct the Isgur-Wise limit of QCD in a form appropriate to lattice gauge theory techniques. The formulation permits a calculation of heavy quark processes even when the momentum transfers are much larger than the inverse lattice spacing. Applications include semi-leptonic heavy quark decay and scattering processes, including the computation of the nonperturbative part of the Isgur-Wise universal function.Comment: Talk given at the 1992 International Lattice Gauge Theory Conference ("Lattice '92"), Amsterdam, 4 pages, in postscrip

    Narrow Technihadron Production at the First Muon Collider

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    In modern technicolor models, there exist very narrow spin-zero and spin-one neutral technihadrons---piT0pi^0_T, rhoT0rho^0_T and omegaTomega_T---with masses of a few 100 GeV. The large coupling of ŌÄT0\pi^0_T to őľ+őľ‚ąí\mu^+\mu^-, the direct coupling of rhoT0rho^0_T and omegaTomega_T to the photon and Z0Z^0, and the superb energy resolution of the First Muon Collider may make it possible to resolve these technihadrons and produce them at extraordinarily large rates.Comment: 11 pages, latex, including 2 postscript figure

    B-Meson Gateways to Missing Charmonium Levels

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    We outline a coherent strategy for exploring the four remaining narrow charmonium states [\eta_{c}^{\prime}(2\slj{1}{1}{0}), h_{c}(1\slj{1}{2}{1}), \eta_{c2}(1\slj{1}{3}{2}), and \psi_{2}(1\slj{3}{3}{2})] expected to lie below charm threshold. Produced in BB-meson decays, these levels should be identifiable \textit{now} via striking radiative transitions among charmonium levels and in exclusive final states of kaons and pions. Their production and decay rates will provide much needed new tests for theoretical descriptions of heavy quarkonia.Comment: 5 pages, uses ReVTeX and BibTe

    Structural Properties of the Lattice Heavy Quark Effective Theory

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    We discuss two related aspects of the lattice version of the heavy quark effective theory (HQET). They are the effects of heavy quark modes with large momenta, near the boundary of the Brillouin zone, and the renormalization of the lattice HQET. We argue that even though large momentum modes are present, their contributions to heavy-light bound states and perturbative loop integrals are dynamically suppressed and vanish in the continuum limit. We also discuss a new feature of the renormalization of the lattice HQET not present in the continuum theory, namely that the classical velocity is finitely renormalized.Comment: 4 pages; postscript; no figures; Talk at Lattice `94 (Bielefeld

    Hadronic Decays of Excited Heavy Mesons

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    We studied the hadronic decays of excited states of heavy mesons (D, D_s, B and B_s) to lighter states by emission of pi, eta or K. Wavefunctions and energy levels of these excited states are determined using a Dirac equation for the light quark in the potential generated by the heavy quark (including first order corrections in the heavy quark expansion). Transition amplitudes are computed in the context of the Heavy Chiral Quark Model.Comment: 4 pages (incl. figures), proceedings of the IV International Conference on "Hyperons, Charm and Beauty Hadrons", Valencia (Spain

    Retardation Terms in The One-Gluon Exchange Potential

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    It is pointed out that the retardation terms given in the original Fermi-Breit potential vanish in the center of mass frame. The retarded one-gluon exchange potential is rederived in this paper from the three-dimensional one-gluon exchange kernel which appears in the exact three-dimensional relativistic equation for quark-antiquark bound states. The retardation part of the potential given in the approximation of order p2/m2p^2/m^2 is shown to be different from those derived in the previous literature. This part is off-shell and does no longer vanish in the center of mass frame
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