perspectives of antiproton and antikaon physics

P. Kienle ECT* Antiproton Workshop 03.07.2006 1

Perspectives of Antiproton and Antikaon Physics

Paul KienleStefan Meyer Institut/ÖAW Wien and TU München

pbar

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).

.

.


Antiprotons for Charm Physics


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 ???


HESR

b

1. Minimize circumference

2. Electron cooler is essentia


Structures to be Discovered


Case Study: Y(4260)


Strategies


PANDA @ FAIR vs. e+e-


X(3872) an Other Case?


X(3872) a Molecule !?


Z(3930) Case


2 3P0 Charmonium


Kaonic Nuclear Clusters

Production with pbar Annihilation


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 ???


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

B = 20 MeV B ~118 MeV

K-K-ppn(0)~3.0

B ~221 MeV

Single-K- Double-K-

Dote et al. 2002


Summary of the Search for Deeply Bound Kaonic States


Exclusive Experiments-Formation and Decay


K-(3He,n) ppK- @ JPARC


K- Potential and ppnK- Bound State

Bound nuclear state

Small width

High density ~3n

Experimental result4He(stopped K-, n) ppnK-

BK ~ 173 MeV, GK ~ 25 MeV Predicted (Akaishi 2002)

BKth ~127 MeV , GK ~ 30 MeV


Fast Pion Triggered Neutron Momentum Spectra with Various Conditions Preliminary

10MeVee threshold only

10MeVee threshold L-arm with software veto

10MeVee threshold with software veto

10MeVee threshold L-arm


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

alignment of reaction plane

alignment of direction

Minv (+p) (GeV) Peak position not stable!Reflection of other resonances?Work in progress …

Ni+

Ni

Al+

Al

alignment of reaction plane

alignment of direction


Λp Invariant Mass Spectrum from 3.5 GeV pC collisions


p Correlations in 3.5 GeV pC Collissions


Antikaons in Nuclei by Antiproton Annihilation

03 KppKHep

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.


Kaon Energy Correlation and Decay Density Distribution for BKK=0.4GeV


Maximum Energy and Momentum of K+ as Function of the Binding Energy BKK


Strangeness Exchange Reaction


Mesons and Antiprotons in Nuclear Media


Mesons in Nuclear Media

A.Sibirtsev et al. Eur .Phys.J A6 (1999) 351Hayashigaki PLB 487 (2000) 96Morath, lee Weise


Subthreshold Production of D Mesons


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 – 10-6 HESR:10-100 s-1


Knock-out Reaction forpbar-Nucleus Boundstates Search

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

Quasi-free scatt.

New experiment at a pbar storage ringwith internal target ? HpppHe

HepnpHe34

34

),(

),(


Anti Lambda in Nuclei


Antideuterons


Antideuteron Breeder Scheme FAIR LOI by Kilian et al.


Production of Antideuterons in Antiproton Rings

Proposal 1982 AIC @ GSI


Can we Breed Anti 3He and More ?

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

03 Hedp

04 Hedd


Fundamental Symmetries and Antihydrogen


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!


Antihydrogen 1s-2s (c2-c1) Transition


Hyperfine Structure Test


Trapped Antihydrogen

Measurement indicateT ~ 2400 K

Needed for trappingT ~ 0.5 K

Temperature

4 o

a e

F

Population of n-States

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)


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.

Sextupole Toroidal Racetrack Storage Ring for Hyperfine Structure Studies of Antihydrogen

sr

Bmv

s

2


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


Dibaryon ppK- p Decay (FINUDA)

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

(detector resolution : 10 MeV/c2 FWHM)

fit region

A.N.Ivanov et al, arXiv:nucl-th/0512037 v1 (2005)B= -119 MeV; = 31 MeV; ~ 0.26 fm-3


Density distribution of K nuclear clusters

JZ / Nov. 29, 2005

by observing the momentum correlation in their 3-body decay products (P. Kienle, Y. Akaishi, T. Yamazaki Phys. Lett. B 632 (2006) 187)

3-body decay correlation techniques may be also applied to study the structure of exotics

K-ppn + p + n


Antiprotons in Nuclei

perspectives of antiproton and antikaon physics

Documents

antiproton annihilationmesons

antiproton absorption

perspectives of antiproton

mev predictedakaishi

p correlation ppk

invariant mass of ppk

software veto10mevee

mev fast pion