A' Anisovich, V' Nikonov, A' Sarantsev, Bonn and Gatchina

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A2 partial wave analysis

• A. Anisovich, V. Nikonov, A. Sarantsev, Bonn
  and Gatchina
• E. Klempt, U. Thoma ,
  Bonn

Topics A2 and TR-16 A2 results p induced
N
Bommerholz, 2006 Nov 27
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A2 and TR-16 Questions of spokesperson

• Einordnung der Fragestellung innerhalb des SFB
• The extraction of baryon resonances and their
  properties is a central topic of TR-16. Partial
  wave analysis is the method to achieve this goal.
• Fortschritt seit Beginn der Laufzeit des SFB
  sowie des letzten Berichtes
• Publication list

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• nähere Bezeichnung der für den Arbeits-
• und Ergebnisbericht eingeplanten  Resultate
  und neuen Erkenntnisse

• Understanding of first, second and
• third baryon resonance region

• Darlegung des bisherigen Mitteleinsatzes
• und des Mittelbedarfs für 2007

• One position BATIIa/Ib for
• Dr. habil. A.V. Sarantsev (50)
• Dr. A.A. Anisovich (50)

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• Skizzierung der Absichten zum
• Fortsetzungsantrag
• Fortsetzung
  yes
• Änderungen gegenüber dem ersten Antrag
• 
  next transparencies
• Physikal. und/oder personelle
  Umstrukturierung
• 
  Project leader
• 
  E. Klempt and U. Thoma
•    Zusammenschluss mit anderen
  Teilprojekten,    
  No plans 
• Stellung innerhalb des SFB
• 
  Central topic for
• 
  resonance physics

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What did we promiss and achieve ?
Graal, Jlab
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Future programme

• Isobar fit to all forthcoming photo-production
  data from Elsa, Jlab, Graal,
• Implementation of methods to reconstruct
  energy-independent partial wave amplitudes
• Inclusion of decays into baryons with Jgt3/2
• Implementation of amplitudes to describe
  pion-induced production

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A2 Results from g p p p0p0 (and
other data)

• Properties of Roper resonance
• 2 p decays of baryon resonances

• Interest
• Low mass, incompatible with quark models
• incompatible with LQCD
• Member of decuplet?
• Two Roper resonances?

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D33
D13
P11
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p p0 p0 Dalitz plot (CB)
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P11 elastic scattering
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No P11(1710)
Two Ropers
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CB ELSA
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TAPS
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CBALL
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First fits where resonances are overconstrained

• p N N p elastic scattering
• p- p n p0 p 0 inelastic scattering
• g p N p photoproduction
• g p p p0 p0 photoproduction

First event based likelihood fits In baryon
spectroscopy
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Results
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Table of results
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Analysis techniques

• Scattering theory
• Elastic scattering
• Weak couplings (D-vector)
• Production (P-vector)
• Production and weak decay

SIiT, (T-1 i I) T-1 iI K T K (I
iK)-1 A K (I iK)-1 D F P (I iK)-1
A P (I iK)-1 D
Plus non-resonant contributions
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Baryons from Protvino

• Use existing equipment to get more data on baryon
  resonances
• Study pion induced reactions
• No additional manpower
• Constraints from Protvino data will yield more
  and better results which will be assigned (in
  Germany) to TR-16

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STATE RESEARCH CENTER OF RUSSIA INSTITUTE FOR
HIGH ENERGY PHYSICS

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STATE RESEARCH CENTER OF RUSSIA INSTITUTE FOR
HIGH ENERGY PHYSICS

LAYOUT OF IHEP EXPERIMENTAL AREA
E70 GeV, I1.71013 ppp Beams of p, K, p, e,
? Fast extraction Slow extraction
Extraction by crystal Internal targets
L1.5 km
100 MeV Linac
U-70 70 GeV
- Running experiments
Booster 1.5 GeV
- Experiments under preparation
Project OKA (IHEP, INR, JINR)
SVD (IHEP, MSU)
FODS
30 MeV RFQ Linac
TNF (IHEP, INFN, JINR)
High intensity area
SPIN_at_U70 (Michigan, Virginia, Protvino, TRIUMF)
ISTRA-M
ND (IHEP, JINR)
RAMPEX (IHEP,UoM, JINR)
VES
MIS ITEP
(INR, IHEP, JINR)
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STATE RESEARCH CENTER OF RUSSIA INSTITUTE FOR
HIGH ENERGY PHYSICS
Meson spectroscopy
VES (IHEP)
Observation of p(1800) unusual decay modes,
which are in agreement with predictions of Flux
Tube model foe hybrid mesons. Observation of
?(1600) state with exotic quantum numbers JPC1-
(forbidden in quark-antiquark system) for ?p,
b1p, ?p decay modes. This state is strong
candidate to hybrid meson.
VES layout
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STATE RESEARCH CENTER OF RUSSIA INSTITUTE FOR
HIGH ENERGY PHYSICS
GAMS-4p
VES
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Baryon production in p- p interactions at 20
Gev/c(few examples of baryon-meson correlations)
p- 20 GeV
p-

s1mb -gt 3107 ev/day
IG Jp0 0
p
N(1/2),N(3/2-),N(5/2)
p-
p-
s100 µb -gt 3 106 ev/day
p0
IG Jp1- 0-
N?
p-
p-
p-
s30 µb -gt 106 ev/day
IG Jp11-
?
p-
?(3 p)
IG Jp11
s30 µb -gt 106 ev/day
?0
Optimal momentum 15 -- 20 Gev/c