38,779 research outputs found
Meson2006 Summary: Theory
This is a summary of theoretical plenary contributions to the biennial hadron
physics conference Meson2006, which was the ninth in this series. The topics
covered in the meeting include low energy pion-pion and pion-nucleon
interactions, photoproduction and hadronic production of light mesons and
baryons,in-medium effects, recent developments in charmed mesons, charmonia and
B mesons, the status of exotica, and some related topics such as final state
interactions. In this contribution we review and summarize the plenary talks
presented by theorists at the meeting, and emphasize some of the main points of
their presentations. Where appropriate we will add brief comments on some
aspects of QCD spectroscopy. Finally, following tradition, we conclude with a
new Feynman story.Comment: 4 pages, 1 Feynman story. Invited summary talk (theory) at the 9th
International Workshop on Meson Production, Properties and Interactions
MESON2006 (Krakow, 9-13 June 2006
HADRON05 Summary: Heavy Quark Hadrons and Theory
This HADRON05 summary covers the topics of (1) mesons containing heavy
quarks, and (2) theory. The new material discussed here is taken mainly from
plenary presentations. We specifically emphasize new or recent results in
spectroscopy that are likely to appear in future editions of the PDG. An
exception is made for the pentaquark, which has now been withdrawn. We
undoubtedly have something important to (re)learn about multiquarks from the
pentaquark saga, and this merits a phrase in Portuguese. The three general
areas we consider are: I. QQbar spectroscopy, II. Qqbar spectroscopy, and III.
lessons from the pentaquark. Finally, in Section IIIb. we conclude with "Our
moment of Zen".Comment: 14 pages, 10 eps figures. Presented at HADRON05 (Rio, 21-26 Aug.
2005
Photoproduction of Hybrid Mesons
In this contribution I discuss prospects for photoproducing hybrid mesons at
CEBAF, based on recent model results and experimental indications of possible
hybrids. One excellent opportunity appears to be a search for the I=1, JPC=2+-,
neutral "(b2)o" hybrid in (a2 pi)o through diffractive photoproduction. Other
notable possibilities accessible through pi+ or pio exchange photoproduction
are I=1, JPC=1-+, charged "pi1+" in f1 pi+, (b1 pi)+ and (rho pi)+; piJ(1770)+
in f2 pi+ and (b1 pi)+; pi(1800)+ in f0 pi+, f2 pi+, omega rho+ and (rho pi)+;
a1 in f1 pi+ and f2 pi+; and omega in (rho pi)o, omega eta and (K1 K)o.Comment: 5 pages, 3 postscript figures. Invited contribution to Confinement
III, CEBAF (8-12 June 1998
MESON2000 Conference Summary
This short contribution is a {\it lite} MESON2000 conference summary. As
appropriate for the 600th anniversary of the Jagellonian University, it begins
with a brief summary of the last 600 years of European history and its place in
hadron physics. Next a ``physicist chirality'' order parameter PC is
introduced. When applied to MESON2000 plenary speakers this order parameter
illustrates the separation of hadron physicists into disjoint communities. The
individual plenary talks in MESON2000 are next sorted according to the
subconference associated with each of the 36 plenary speakers. Finally, I
conclude with a previously unreported Feynman story regarding the use of models
in hadron physics.Comment: 11 pages, 3 figures, uses appolb.cps and epsfig. MESON2000 Conference
Summary Tal
Update on Charmonium Theory
In this invited presentation I review some recent developments in the theory
of charmonium that appear likely to be of importance for future experimental
studies in this field. The specific areas considered are double charmonium
production, LQCD studies of charmonium, recent results for hadron loops, c-cbar
production cross sections at PANDA, charm molecules, and two recent
developments, "charmiscelleny".Comment: 8 pp., 3 figures. Invited contribution to HADRON 2009 (XIIIth
Internatl. Conf. on Hadron Spectroscopy, Tallahassee, FL, Nov.29 - Dec.4
2009)
Psi to N Nbar m
In this invited talk I discuss two recent applications of charmonium (Psi)
decays to N Nbar m final states, where N is a nucleon and m is a light meson.
There are several motivations for studying these decays: 1) They are useful for
the study of N* spectroscopy; 2) they can be used to estimate cross sections
for the associated charmonium production processes p pbar to Psi m, which PANDA
plans to exploit in searches for charmonium hybrid exotics; and 3) they may
allow the direct experimental measurement of NNm (meson-nucleon) strong
couplings, which provide crucial input information for meson exchange models of
the NN force. The latter two topics are considered in this talk, which will
also compare results from a simple hadron pole model of these decays to recent
experimental data.Comment: Invited contribution to Charm2010 (Fourth International Workshop on
Charm Physics), Beijing, China, 21-24 Oct. 2010. 3 pages, 3 figures, uses
epsfi
Radial Excitations
In this contribution I review recent experimental developments in the
spectroscopy of higher-mass mesons, especially candidate radial excitations
discussed at the WHS99 meeting in Frascati.Comment: Postscript, 14 pages, 1 fig, uses included frascatiphys.sty. Summary
Report, Session on Radial Excitations, WHS99 (Frascati, 8-12 March 1999
Hybrid Baryons, a brief review
This contribution is a brief review of the status of hybrid baryons, which
are hypothetical baryons that incorporate a gluonic excitation. We first
summarize the status of hybrid mesons, since this closely related topic has
seen considerable recent activity with the identification of two exotic
candidates. Next we review theoretical expectations for the masses and quantum
numbers of hybrid baryons, which have come from studies of the bag model, QCD
sum rules and the flux tube model. Finally hybrid baryon experiment is
discussed, including suggestions for experimenters at COSY.Comment: 11 pages, 5 figures. Invited contribution to the COSY Workshop on
Baryon Excitations, Juelich, 2-3 May 200
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