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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 p puzzle
[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 n n conversion reactions
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

p inv mass finuda vs obelix

G. Bendiscioli et al., NPA789(2007)222

G. Bendiscioli et al., EPJA40(2009)11

p4He→(pπ-)pK0sX

¯

Λp inv mass: FINUDA vs OBELIX

ppπ- 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

p inv mass fopi vs old k d experiments
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)