(A Few) Recent Developments in Hadron Spectroscopy (setting the stage for subsequent spectroscopy talks) Topics: I. Basic hadronics II. Some exciting areas of current research: a. Charm hadrons b. Exotics III. Future Ted Barnes Physics Div. ORNL ICHEP2010 Paris, 23 July 2010
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Topics: I. Basic hadronics II. Some exciting areas of current research: a. Charm hadrons
Ted Barnes Physics Div. ORNL ICHEP2010 Paris, 23 July 2010. (A Few) Recent Developments in Hadron Spectroscopy (setting the stage for subsequent spectroscopy talks) . Topics: I. Basic hadronics II. Some exciting areas of current research: a. Charm hadrons b. Exotics III. Future . - PowerPoint PPT Presentation
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(A Few) Recent Developments in Hadron Spectroscopy
(setting the stage for subsequent spectroscopy talks)
Topics:
I. Basic hadronicsII. Some exciting areas of current
research:a. Charm hadronsb. Exotics
III. Future
Ted BarnesPhysics Div. ORNL
ICHEP2010 Paris, 23 July 2010
1. Basic hadronics
QCD flux tube (LGT, G.Bali et al.;hep-ph/010032)
LGT simulation showing the QCD flux tubeQ QR = 1.2 [fm]
“funnel-shaped” VQQ(R)
Coul. (OGE)
linear conft.(str. tens. = 16 T)
Color singlets and QCD exotica
“confinement happens”.
Physically allowed hadron states (color singlets) (naïve, valence)
ph’is a nice channel because nn couplingsare weak for once (e.g. the a
2(1320) noted here).
The reported exotic P-wave is dominant!
The (only) strong JPC-exotic H candidate signal.
A.Alekseev et al. (COMPASS Collab.) Observation of a JPC =1-+ exotic resonance in diffractive dissociation of 190 GeV pi- into pi- pi- pi+ArXiv:0910.5842v3 (Sept. 2009)M = 1660 +-10 +0 -64 MeV , Gamma = 269 +-21+42 -64 MeV.
p1(1600)
JPC exotic(confirmed)
n.b.
resonant phase motion (confirmed but not shown here)is of course the crucial test
J.J.Dudek, R.G.Edwards, M.J.Peardon, D.G.Richards and C.E.Thomas,([JLAB] Hadron Spectrum Collaboration)
Toward the excited meson spectrum of dynamical QCDarXiv: 1004.4930v1
Most recent LQCD results for light exotics, JPC = 1- + , 2+ - , 0+ - .
mq incr. ->u,d
2.5 GeV
2.0 GeV
1.5 GeV
n.b.
All 3 of these exotic JPCs were degen. in the flux-tube model.
In the bag model, 1-+ is lighter.
p1(1600)
1.0 GeV
3. Future
Future…
Spectroscopy involves an active interplay between theory and experiment.Consequently, future topics will depend on developments in both areas.
Experiment:
BES-III is currently gathering high statistics cc data (J/y and y‘) in e+e-.
COMPASS has reported new results on light exotic spectroscopy in HE hadroproduction.
GlueX will use protoproduction to search for light hybrids (incl. exotic JPC) at JLAB, start ca. 2015.
PANDA will search for cc-hybrids (incl. exotics) at GSI, start ca. 2017.
Theory:
LQCD is being extended to light quarks; we should have accurate JPC-exotic mass estimates and predictions of EM couplings and (open flavor) strong decays in the next few years.