Upload
edan-velazquez
View
21
Download
1
Embed Size (px)
DESCRIPTION
T.Skorodko, University Tuebingen for CELSIUS-WASA. Two-pion production in Delta-Delta region – approaching the ABC puzzle by exclusive and kinematically complete measurements. First step into the ABC. - PowerPoint PPT Presentation
Citation preview
Two-pion production in Delta-Two-pion production in Delta-DeltaDelta
region – approaching the ABC region – approaching the ABC puzzlepuzzle
by exclusive and kinematically by exclusive and kinematically completecomplete
measurements.measurements.
T.Skorodko, University Tuebingen
for CELSIUS-WASA
First step into the ABCFirst step into the ABC
Alexander Abashian, Alexander Abashian, Norman E. Booth and Norman E. Booth and Kenneth M. Crowe, Kenneth M. Crowe, Phys. Rev. Lett. Phys. Rev. Lett. 55, 258 (1960), 258 (1960)
5.113 He
X Hepd 3
labHe
P3
π
2 π Phase SpaceMeV 743pT
C
All of ABCAll of ABC
dXnp Xpd He3
Xdd He4
No ABC effect!
ABC effect
ΔΔΔΔ
π
N
Δπ
NΔ
π N
Δ
π
N
Δ
Large π π invariant mass
Small π π invariant mass
ππ
π π π
π π
ABC and ABC and ΔΔΔΔ models models
labdP
00
M HeM 3
M.Bashkanov et. al, Phys. Lett. B637 (2006) 223-228
He3
He3
(I=0,1)
(I=0)
pdpd33He He ππππ, T, Tpp=895 MeV=895 MeV
ΔΔΔΔ versus versus NN* decays* decays
HeM 3
He3
He3
He3
He3
*N
0
0
pdpd33He He ππππ, T, Tpp=895 MeV=895 MeV
ΔΔΔΔ versus Reality versus Reality
Bound Bound ΔΔΔΔ
3He
p
d
mol
ecul
e
ΔΔΔΔ interaction interaction
2
2
20
2
2
111
qqra
R
s
fmR 1.1
fmfmas 10
16
fmr 20
Migdal-Watson ansatz
ABC effect on ABC effect on 33He and dHe and d003 Hepd 00 dpn
GeV 037.1pTGeV 895.0pT
ΔΔ interaction data of O. Khakimova
Total x-section forTotal x-section for dpn
Celsius/WasaHeidelberg – Tel-Aviv
JINR
unbound (ΔΔ)int
bound (ΔΔ)int (24 MeV)
pp pp pp ppABC effect ? ABC effect ?
interaction
ConclusionConclusion
It is extremely important to make It is extremely important to make exclusive measurements:exclusive measurements:
ABC effect is one bump, not two!ABC effect is one bump, not two! ABC effect may be explained by ABC effect may be explained by ΔΔΔΔ
molecule or by molecule or by ΔΔΔΔ interactioninteraction.. Very strong attractive Very strong attractive ΔΔΔΔ interaction. interaction.
|a|ass||13fm13fm tottot indications of indications of ΔΔΔΔ bound state. bound state.