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“ Resonant formation of the K - p quasi-bound state in stopped-K - absorption in 4 He, 3 He and d : Experimental test of the Λ(1405) vs Λ(1420) Ansatz “ Toshimitsu Yamazaki, Jafar Esmaili and Yoshinori Akaishi at ECT* October 15, 2009. K - - p “atom” identified as L (1405).

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slide1

“Resonant formation of the K-p quasi-bound state in stopped-K- absorption in 4He, 3He and d: Experimental test of the Λ(1405) vs Λ(1420) Ansatz“Toshimitsu Yamazaki, JafarEsmaili and Yoshinori Akaishiat ECT* October 15, 2009

k p atom identified as l 1405
K- - p“atom” identified as L(1405)

fundamental building block of

Kbar nuclear condensed matter

  • Strongly attractive K- - p

-> deep and strong binding

  • Molecular nature of K-pp
  • Evolution of K- nuclear systems

* Superstrong nuclear force

-> Kaon condensation

  • All depend on the
  • L(1405) AnsatzValid ?
slide4

Avoid confusing prejudices and wishful thinking:

Robust experimental signature: urgently called for

L*=K-p

as a Feshbach resonance

Coupled channels

1: Kbar N

2: S p

For a given M:

--> s11, s12, s22

Single-pole or double-pole ?

More Confusion: T21 or T22 ?

slide5

KN->Sp invariant mass spectra

2: Sp 1: KN

Arbitrary unit

KbarN missing mass

spectrum

Sp->Sp

invariant mass

spectra

Escape of K

Conversion

s1/2[MeV]

L(1405)

L(1420)

Characteristics

of T22 :

rising above

KbarN threshold

slide8

Hemmingway

S+(1660) -> (Sp)0+ p+

  • Zychor

pp -> K+ (S0p0)p

DD91, Hyodo-Weise

use T22 Sp -> Sp

without justification

Serious discrepancy

above the KbarN threshold

interpretation of zychor s data
Interpretation of Zychor’s data

SPECTRAL SHAPE

Realistic treatment

* Sp emission

threshold

* K- + p threshold

CAUTION !!

For a broad resonance

the apparent peak

position deviates

downward

M~1406 G~40

most likely, but

Need more statistics !

discovery of l 1405 alston et al 1961 k p sp 0 p p

Is this a L(1405) peak?

No! It is a quasi-free peak

Discovery of L(1405): Alston et al. (1961)K- + p -> (Sp)0 + p+ + p-

New problem raised:

Is it true?!

No, not true

Stopped K- in 4He

(Sp)0

(Sp)+-

slide12

arXiv: _0906.0505

  • Resonant formation (nuclear tuning)

K- + “p”L* S + pgoverned byT21

K- + “p” S + p(quasi-free)

constrained by spectator momentum

arXiv:0909.2573

slide13

M [MeV/c2]

Free Inv.-mass Th.

Proj. Inv.-mass Th.

 partial invariant-mass spectra

slide15

S orbit abs.

G. Pot.

=35 MeV

2

M* (MeV/c2)

2 ,s :  invariant-mass spectra

d target small and large momentum components
d target: small and large momentum components

Resonant formation

of L(1405)

distinctly visible

slide18

Hyodo-Weise

(chiral)

Akaishi-Yamazaki

(phenom)

MSp[MeV/c2]

Sp invariant-mass spectrum

from stopped K- onD

slide20

Two-pole form of L(1405)

J. Revai & N.V. Shevchenko, Phys. Rev. C 79 (2009) 035202

Sp invariant-mass spectrum

from stopped K- onD

C3G pot.

2nd pole effect

is negligible !

one pole

A-Y

1410-64

R-S

One-pole

R-S

Two-pole

MSp[MeV/c2]

2nd pole

1st pole

No visible effect of

the 2nd pole

how can we determine simulation stopped k on d experimental design j parc proposal t suzuki et al
How can we determine ?Simulation stopped K- on dExperimental design-> J-PARC ProposalT. Suzuki et al.
slide24

K lab= 5 MeV/c

1420

1405

Resonant

QF

80 MeV/c

120 MeV/c

160 MeV/c

Stopped kaon does not

provide a good set up

to learn about L(1405).

200 MeV/c

covers!

Non-resonant

QF

All are normalized to 1

M(Sp) [MeV/c2]

Low-momentum K-+D reaction

QF

Spectator process dominates!

K lab= 200 MeV/c

D. Jido, E. Oset & T. Sekihara,

Eur. Phys. J.

K lab= 120 MeV/c

X

K lab= 5 MeV/c

Projection spectra of 3-body Dalitz

slide26

decreases!

cf. P. Kienle, Y. Akaishi & T. Yamazaki, Phys. Lett. B 632 (2006) 187

Dalitz plot for spectator process

O. Braun et al., Nucl. Phys. B 124 (1977) 45

QF

Cusp

M(Lp) [MeV/c2]

S(1385)

L(1405)

M(Lp) [MeV/c2]

M(Sp) [MeV/c2]

jos ascribed the component around m 1400 to s 1385 to conclude l 1420
JOS ascribed the component around M~1400 to S*(1385) to conclude L*(1420)
  • More statistics necessary:
  • A proposed experiment at J-PARC
slide28

No conclusive results on L(1405) yet,

but many promising experiments

NEAR FUTURE EXPERIMENTS

Highly Awaited

K- + d K-p + nMM (n) KEK, both at rest and in-flightK- + 3He  K-p + dMM (d)

AMADEUS, at rest, J-PARC

p + p K+ + (Sp) + p

HADES