Strong Decays and Couplings

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HADRON05summary, HQ ( some theory)
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T. Barnes Physics Div. ORNL Dept. of Physics,
U.Tenn. HADRON05 Rio, 21-26 Aug. 2005
Summary, Heavy Q ( some theory)
Basic filters Is it hadronic? Does it have c or
b? It is newish? Is it likely to appear in the
PDG? Was it on M-Th?
1. QQ 2. Qq 3. q4q, and an appropriate phrase
in Portuguese
(not my assignment but I
cant resist.) 3. Our moment of Zen
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0. Will my very important HQ / theory plenary
talk be cited?
Now for a few details
Effective Field Theories for Heavy Quarkonium
N.Brambilla Exciting Developments in Hadron
Spectroscopy Charmonium, Bottomonium, and the
rest K.Seth Spectroscopy of D
Mesons S.Bianco The Fair Project at
GSI K.Peters Review on JLAB Results E.Smith
Scalar Mesons in B Decays W.Ochs Hadron
Spectroscopy from CLEO-c and BES C.Z.Yuan The
Sigma and Kappa Report of the Scalar Mesons
Working Group D.Bugg Hadron Physics at
DAFNE S.Miscetti Three-body Heavy Meson
Decays D.Asner
QCD Phenomena at the Amplitude Level and the
Ads/CFT Correspondence S.Brodsky Recent
Developments of LQCD Z.Fodor Exotic Mesons from
E852 G.Adams Future of Hadron Physics at
Fermilab J.Appel Recent Physics Results from
P.Auger Observatory J.Mello Netto The PANDA
Project at GSI G.Boca
Complex Meson Spectroscopy E. van Beveren Hadron
Physics at Belle K.Trabelsi Recent Results from
Compass S.Paul The GlueX Project D.Carman Review
on COSY and Celsius Physics H.Machner
Hadron Physics at BaBar D.Muller Review of Heavy
Hadron Spectroscopy E.Swanson Recent Results on
Baryon Spectroscopy J.Cumalat Hadron Physics at
the Tevatron A.Maciel Pion Physics Results
from DIRAC L.Afanasev Hadronization The Unsung
Hero Rather Than The Alleged Villain in the Tale
of CP Violation I.Bigi
Yes.
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1. QQ
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K.Trabelsi Hadron Physics at Belle
W
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cc spectrum
y(4415)
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cc spectrum
y(4415)
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An interesting new charmonium production
mechanism! Allows access to C() cc states in
ee- w/o using gg.
X(3943)
X(3943)
hc
hc
c0
No c1 or c2 !?
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Y(3943)
B -gt KY(3943), Y -gt w J/y
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Z(3931)
gg -gt Z(3931) -gt DD
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Y(4260)
ee- -gt Y(4260)ISR, Y -gt pp-J/y
log scale
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cc spectrum, potential models (dashed nonrel L,
Godfrey-Isgur R) vs data
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K.Trabelsi Hadron Physics at Belle
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A.Maciel Hadron Physics at the Tevatron
X(3872)
p p- J/y mode roJ/y
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Comparable wJ/y and roJ/y modes maximal isospin
violation. (Predicted by the DoDo model.)
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X(3872)
DoDo model (S-wave, 1piEx)
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K.Trabelsi Hadron Physics at Belle
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2. Qq
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A.Maciel Hadron Physics at the Tevatron
Bc
Theor. Expectations
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S.Bianco Status of D Mesons
BABAR
CLEO
DSJ OBSERVATIONS BY BABAR CLEO BELLE

• BABAR finds prominent narrow resonance
  Dsj(2317)?Ds p0
• CLEO finds prominent narrow resonance
  Dsj(2463)?Ds p0
• BELLE finds evidence for Dsj(2463)?Dsg and
  determines JP1 for Dsj(2463)
• Historical account in SB, Fabbri, Benson, Bigi
  Riv.Nuovo Cim. 26,7-8, 2003 hep-ex/0309021

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(Godfrey and Isgur potential model.)
Prev. (narrow) expt. states in gray.
DK threshold
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DSJ OBSERVATIONS BY BABAR CLEO BELLE

• It seems natural to interpret Dsj(2317) and
  Dsj(2463) as 0 and 1 states, respectively
• They are narrow because below the DK threshold,
  and therefore isospin-violating
• Much lower mass than the 1 (2535) and 2 (2572)
  narrow partners
• Where are the
• corresponding cu states (if
• flavour symmetry
• applies) ???
• They should be lighter
• than Dsj(2317) and
• Dsj(2463).

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NEW BELLE RESULTS (I)A.Drutskoy HEP05 (EPS)
Lisboa, BELLE-Conf-0516,0519. BELLE Coll.,
hep-ex/0507030

• Improved measurement of B0?DsJ K- decays
• Quark content of final state completely different
  from B meson,
• calling for non-trivial decay mechanisms. Decay
  is also sensitive to 4-q
• content. New measurement improves previous with
  higher statistics
• (PRL 94 061802).

Rate for B0 decay to DsJ(2317) is 3x larger
than rate to DsJ(2460)
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NEW BELLE RESULTS (II)A.Drutskoy HEP05 (EPS)
Lisboa, BELLE-Conf-0516,0519. BELLE Coll.,
hep-ex/0507030

• Observation of
• Ds1(2536)?Dp-K

BELLE also studied S-wave component, which may
give info on mixing between the two 1 states
newly discovered.
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E.van Beveren
Complex meson spectroscopy
Couple M1M2 and qq basis states (sum loop
diagrams). Result is an MM scattering T-matrix
Valence-continuum coupling. (Here the 3P0 model.)
E denom.
You can track naïve qq states (mass and width) as
a function of this valence-continuum coupling.
Rather large shifts, but results look like
reality.
This general technique is probably the new
paradigm we need to describe the Ds0(2317).
(and ) Unquenching the quark model.
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Three-Body Heavy Meson Decay presented at
Hadron05, 23 Aug 2005, Rio de Janeiro, Brazil
David Asner, Carleton University

• A review of recent results from
• E791, FOCUS, CLEO, BABAR,BELLE

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Brief History

• Charm three body analyses from several
  experiments summarized in hep-ex/0410014
• Extension of PDG2004 review
• Variety of Physics probed
• Doubly-Cabibbo suppressed decays
• CP Violation
• charm mixing
• Properties of light mesons
• Properties pp Kp S-wave
• Usual analysis technique for P ? 3P decays is
  Dalitz-plot analysis technique

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Beyond P?3P Decays

• D0 ? ABC (P ? 3P) described by 2 variables
• Dalitz plot (MAB)2 vs (MBC)2
• Initial and/or final state particles that are not
  spinless increases number of variable needed to
  describe kinematics
• Belle B- ?Lcpp-
• Belle B0 ? D()0 pp-
• Belle B- ? D()p-p-
• Also there are P ? 4P
• FOCUS

Study Excited D-mesons

• Measured M, G for
• D2, D20 D00 in P? 3P
• D10, D1, D10 in P -gt VPP 2 extra d.o.f.
• Angle between ps in D frame
• Azimuthal angle between p from D and
  B?Dpp decay plane

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B?D()pp
D2
D2, D1, D1
PgtVPP
Pgt3P
D0
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E.S.Swanson
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Theory techniques / new ideas. (Some HQ
overlap.)
Effective Field Theories for Heavy
Quarkonium N.Brambilla Systematic derivation of
Leff between g (qq)1 (qq)8 . Many
applications. (G spec, baryon spec, EM widths,
mQ, spin-dep potentials ) QCD Phenomena at the
Amplitude Level and the Ads/CFT
Correspondence S.Brodsky CFT in higher dims. -gt
SLAC Bag Model II -gt spectrum, Light cone wfns -gt
hard scattering physics. Its just like
somebody coming from outer space and saying
Heres how hadrons work. -SJB Recent
Developments of LQCD Z.Fodor Review of LGT in
spectroscopy. Exciting new recent developments in
nonzero m and EOS.
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J.Appel Future of Hadron Physics _at_ FNAL
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Physics topics covered in PANDA

• Charmonium
• Exotics hybrids, glueballs and other exotics
• Mesons in nuclear matter
• Charmonium absorption in nuclear matter
• Hypernuclear physics
• Open charm factory CP violation, and D physics
• Crossed-channel Compton scattering and related
  exclusive processes
• Electromagnetic form factors of the proton in the
  time-like region

G.Boca, K.Peters ca. 350 collaborators ca. 2013
A.D. start
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3. q4q
Abstracted from Review on Jlab Results E.Smith
O pentaquark morreu!
Q
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High Statistics CLAS(d) result
preliminary
M(nK)(GeV)

• Model-independent uppper limit 95 CL for Q is lt
  20nb.
• With assumptions about the spectator, we can set
  a model-dependent upper limit to the cross
  section of lt 4-5 nb.

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Upper Limit on the Q Yield
(p)
Counts/4 MeV
Counts/4 MeV
-0.8 lt cosqCM lt -0.6
preliminary
M(nK)(GeV)
Counts/4 MeV
0.6 lt cosqCM lt 0.8
M(nK)(GeV)
M(nK)(GeV)
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What went wrong? We have been here before!
Suggested reading The Multiquark Fiasco,
N.Isgur, in Acta Physica Austriaca Suppl.
XXVII, 177 (1985).
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More warnings
If M gt M1 M2, it falls apart into had1 had2
R.L.Jaffe, Perhaps a Stable Dihyperon PRL38,
179 (1977).
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The problem fall-apart eliminates multiquark
resonances.
Decay of a qq meson. Requires an HI (qq pair
production).
Fall apart of a multiquark system into 2
minimal color singlets. No HI required. It does
not exist as a resonance (w/o a fission barrier).
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3) Words of wisdom
Jorge Agustín Nicolás Ruiz de Santayana
(1853-1952) AB, PhD Harvard (1886,1889). Prof.
of Philosophy, Harvard (to 1912).
"Those who cannot remember the past are condemned
to repeat it." Life of Reason, Reason in Common
Sense (1905)
"Scepticism is the chastity of the intellect, and
it is shameful to surrender it too soon or to
the first comer." Scepticism and Animal Faith
(1923)
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3. Our moment of Zen
The story of the pentaquark shows how poorly we
understand QCD.
- F. Wilczek
end
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Thanks to Alberto Reis and colleagues at CBPF for
their kind hospitality and heroic efforts in
hosting HADRON05