1,404 research outputs found
Charmonium levels near threshold and the narrow state X(3872) \to \pi^{+}\pi^{-}\jpsi
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 channel, while
the dominant decay of the 1:3D3 state should be into . 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
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
In modern technicolor models, there exist very narrow spin-zero and spin-one
neutral technihadrons---, and ---with masses of a
few 100 GeV. The large coupling of to , the direct
coupling of and to the photon and , 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
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
-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
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
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
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
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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