3,399 research outputs found
Recent Results from BaBar, Belle, BESIII and CDF
A brief report of some recent experimental developments concerning the ,
and charmoniumlike mesons states and other puzzling states from the
BaBar, Belle, BESIII and CDF experiments is presented.Comment: 7 pages, 13 figures, write-up of a plenary talk on XYZ mesons etc at
Quark Confinement & Hadron Spectrum IX, Aug 30 - Sept 3, 2010, Madri
The XYZ mesons: what they aren't
I discuss the properties of some representative mesons in the context
of the most commonly proposed models for their underlying nature.Comment: 8 pages, 6 figures, write-up of talks given at Charm2018 in
Novosibirsk, May 2018 and New Physics in the Flavor Sector Workshop in
Nagoya, November 2018. To appear in the Charm2018 proceeding
A New Hadron Spectroscopy
QCD-motivated models for hadrons predict an assortment of "exotic" hadrons
that have structures that are more complex than the quark-antiquark mesons and
three-quark baryons of the original quark-parton model. These include
pentaquark baryons, the six-quark H-dibaryon, and tetraquark, hybrid and
glueball mesons. Despite extensive experimental searches, no unambiguous
candidates for any of these exotic configurations have been identified. On the
other hand, a number of meson states, one that seems to be a proton-antiproton
bound state, and others that contain either charmed-anticharmed quark pairs or
bottom-antibottom quark pairs, have been recently discovered that neither fit
into the quark-antiquark meson picture nor match the expected properties of the
QCD-inspired exotics. Here I briefly review results from a recent search for
the H-dibaryon, and discuss some properties of the newly discovered states
--the proton-antiproton state and the so-called XYZ mesons-- and compare them
with expectations for conventional quark-antiquark mesons and the predicted
QCD-exotic states.Comment: 34 pages, 22 figures, a review article that will appear in Frontiers
of Physic
Comment on the X(3915) nonstandard hadron candidate
I review the experimental evidence for the , the candidate
nonstandard meson associated with resonance-like peaks in
and near
~MeV, and address the conjecture that it can be
identified as the , the radial excitation of the
charmonium state. Since the partial decay width for is
at least an order-of-magnitude larger than that for ,
its assignment as the is dubious.Comment: 6 page, 5 figures, to appear in the proceedings of "e+e- Collisions
From Phi to Psi 2019," Novosibirsk, February 201
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