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[K - pp] search now is a “ Λ p puzzle” - PowerPoint PPT Presentation
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[K - pp] search now is a “ Λ p puzzle”. Several experiments measure different ( Λ p) invariant mass signals: are they indeed in such a disagreement ?. E549 vs FINUDA. H. Outa, E549 Collaboration, talk given at this workshop. S. Piano, FINUDA Collaboration, talk given at this workshop.
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[K-pp] search now is a “Λp puzzle”
Several experiments measure different (Λp) invariant mass signals:
are they indeed in such a disagreement ?
E549 vs FINUDA
H. Outa, E549 Collaboration,
talk given at this workshop
S. Piano, FINUDA Collaboration,
talk given at this workshop
K-4He → Σπ(3N) (ΣN→ΛN)
K-4He → ΣN(3N) ?
Unlikely due only to ΣN conversion
K-4He → ΛN(2N)
not acceptance corrected
not acceptance corrected
FINUDA: ΣN→ΛN conversion reactions
Simulations: Λp Invariant Mass
ΣN→ΛN cannot explain
the FINUDA Λp bump:
Inv Mass Spectra is
out of range
and/or
Angular Distribution
has a different shape
K-6Li→Σ0,+π0,-4Hgs
Σ0p→Λp
Σ+n→Λp
K-6Li→Σ0p4Hgs
Σ0→Λγ
K-6Li→Λp4Hgs
K-6Li→Σ0,+n4Hgs
Σ0p→Λp
Σ+n→Λp
Simulations: Λp angular distribution
K-6Li→Σ0,-p4Hgs
Σ0n→Λn
Σ-p→Λn
G. Bendiscioli et al., NPA789(2007)222
G. Bendiscioli et al., EPJA40(2009)11
p4He→(pπ-)pK0sX
¯
Λp inv mass: FINUDA vs OBELIXppπ- invariant mass spectrum
T. Buran et al., PL20(1966)318
K-(CF3Br)→ΛpX
K-6Li→Σ0p4Hgs
Σ0→Λγ
S. Piano, FINUDA Collaboration,
talk given at this workshop
K-6Li→Λp4Hgs
K-6Li→Λπ0,+,-p4Hgs
not acceptance corrected
not acceptance corrected
All these reactions are can occur on d only
Λp inv mass: FOPI vs (old) K-d experiments
N. Hermann, FOPI Collaboration,
talk given at this workshop
The signal is compatible with a
K-d absorption with pion
production
K-d→(Σ+n)π-→(Λp)π-
D. Eastwood et al., PRD3(1971)2603
K-d→Λp π-X (1.45 GeV/c and 1.65 GeV/c)
Signal also compatible with a threshold (ΣN) cusp effect (no resonance needed)
D. Cline et al., PRL20(1968)1452
K-d→Λp π-X (400 MeV/c)
