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### Perspectives of Antiproton and Antikaon Physics

### Can we Breed Anti 3He and More ?

pbar

Paul Kienle

Stefan Meyer Institut/ÖAW Wien

and TU München

Proc. LEAP 05 , AIP publication 2005

Some Selected Topics

- Antiprotons for Charm Physics
- Kaonic Nuclear Clusters – Production with Antiproton Annihilation
- Mesons and Antiprotons in Nuclear Media
- Anti Deuteron Beams for Charm in Nuclei?
- Can we breed Anti Helium?
- Fundamental Symmetries and Antihydrogen

Case Studies: Y(4260)X(3872)Z(3930)X(3940)Y(3940)...

Spectroscopy of Charmonium States

- Measurement of the total width and all branching widths of the charmonium states
- Determination of the transition probabilities
- Deduction of the wave functions of the states
- Access to non-perturbative and thus confinement effects
- Needs advanced QFT treatment (Weise et al.)

Such a program was proposed by Bertold Stech ~ for the bottomonium system to search for non-perturbative effects. It looks even more promising for charmonium. Who does it ???

Strangeness and Charm in Nuclei

- Discovery of strange tribaryon: ppnK-, pnnK- with binding energies of about 200 MeV and Γ< 20 MeV
- Work in progress to search for predicted high density of these kaonic nuclear clusters with <ρ>~ 3ρ(0)
- Production of kaonic nuclear clusters by antiproton absorption, including transfer of 2 antikaons to produce high density matter kaon condensation ? New form of fermionic matter ???
- The creation of charmed bound nuclear matter {D+n} is a real challenge. Anti-deuteron annihilation ??? Subthreshold antiproton annihilation ???

Single-K-

Dote et al. 2002

3He K-ppn (0)=0.14 r(0)~1.5

B = 20 MeV B ~118 MeV

K-K-ppn

r(0)~3.0

B ~221 MeV

K- Potential and ppnK- Bound State

Experimental result

4He(stopped K-, n) ppnK-

BK ~ 173 MeV, GK ~ 25 MeV

Predicted (Akaishi 2002)

BKth ~127 MeV , GK ~ 30 MeV

- Bound nuclear state
- Small width
- High density ~3n

Fast Pion Triggered Neutron MomentumSpectrawith Various Conditions Preliminary

10MeVee threshold L-arm

10MeVee threshold only

10MeVee threshold with software veto

10MeVee threshold L-arm with software veto

Ni-Ni Collisions @ 1.9A GeV (FOPI)Λ-d Correlation from ppn K- (?)

N. Herrmann, Proc. EXA 05, Vienna 2005

M > M(KEK)

> (KEK)

Origin:Collision effects?

Ni (2003) – Al (2005)- Λp Correlation (ppK-)? A Comparison

Ni+Ni

alignment of reaction plane

alignment of L direction

Al+Al

alignment of reaction plane

alignment of L direction

Minv (L+p) (GeV)

Peak position not stable!

Reflection of other resonances?

Work in progress …

Antikaons in Nuclei by Antiproton Annihilation

Production of ppK- cluster by the annihilation of the n in 3He and creation of a K- K0 pair

Missing mass spectroscopy of K0+ + -

Invariant mass of ppK- Λ + p decay

Exclusive formation and decay measurement in a 4-detector allowing K0 and Λ reconstruction

Double Antikaon Production in Nuclei by Antiproton Annihilation

- The process:
- The cross section:
- The kinematics
- Double kaon production in nuclei:

With the binding energy exceeding ~ 225 MeV,

double kaonic nuclei can be produced

even by stopped antiprotons.

Mesons in Nuclear Media

A.Sibirtsev et al. Eur .Phys.J A6 (1999) 351

Hayashigaki PLB 487 (2000) 96

Morath, lee Weise

Antiprotons Bound in Nuclei

I.N.Mishustin, L.M.Saturov, Th.Bürvenich, H.Stöcker, W.Greiner,

Phys.Rev, C 71, 035201 (2005) and references shown there.

Exact G-Parity Symmetry predicts very deep potential:

-V-S ~ -650 MeV

However G-Parity is violated on the mean field level

Calculations using „weak G-parity, and rearrangement of nuclear structure by the strong attraction of a real antiproton

B ~ 1 GeV !, ~ 9-23 MeV, P~ 10-5 – 10-6HESR:10-100 s-1

Knock-out Reaction forpbar-Nucleus Boundstates Search

Quasi-free scatt.

Aslanides et al, Nucl. Phys. A470,445 (1987)

New experiment

at a pbarstorage ring

with internal target ?

In principle „Yes“ using the continuation of the breeding process using the anti protons colliding with antideuterons

The Holy Grail of Symmetry Tests

Y.Yamaguchi; Prog. Th. Phys. 111 (2004) 545, „Riemannian QFT“ breaks Lorentz invariance, but not CPT Lorentz invariance tests are asked for!

Trapped Antihydrogen

Population of n-States

Temperature

Measurement indicate

T ~ 2400 K

Needed for trapping

T ~ 0.5 K

ρ mostly above 0.1 µm

n > 15

Hyperfine Structure of Antihydrogen

Accuracy of hydrogen hyperfine structure: 2mHz

Improvement:Sextupole race track storage ring,like

NESTOR (W.Paul and U.Trinks)

Sextupole Toroidal Racetrack Storage Ring for Hyperfine Structure Studies of Antihydrogen

Equilibrium condition of antihydrogen with magnetic moment μ on a circular orbit with radius ρs in a toroidal sextupole field with magnetic field gradient ∂B/∂rlρs:

With the parameters of the NESTOR storage ring, ρ= 0.5 m, B=3.2 T and

∂B/∂r = 1.2 T/cm one can store antihydrogen with v= 600 m/s or equivalent

to a temperature of 21 K (!!!) which is easier to produce than required for standard traps.

Sketch of a Lay out of a Sextupole Storage Ring for Antihydrogen HFS Studies

Dibaryon ppK- p Decay (FINUDA)

fit region

(detector resolution : 10 MeV/c2 FWHM)

A.N.Ivanov et al, arXiv:nucl-th/0512037 v1 (2005)

B= -119 MeV; = 31 MeV; ~ 0.26 fm-3

[Phys. Rev. Lett. 94, 212303 (2005)]

Density distribution of K nuclear clusters

by observing the momentum correlation in their 3-body decay products

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

K-ppn

+ p + n

3-body decay

correlation techniques

may be also applied to

study the structure of exotics

JZ / Nov. 29, 2005

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