L S X Oct. 10-14Hyp2006 Mainz Summary SUMMARY Hyp 2006 - Mainz Ed V. Hungerford University of...

Oct. 10-14 Hyp2006 MainzSummary

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SUMMARYHyp 2006 - Mainz

Ed V. Hungerford

University of Houston

[email protected]

Strangeness happens everywhere


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1) My first task is to say

THANK YOU Thank you speakers and conferees, especially the students I know the dedication, years of work, and the time you have taken to prepare your presentations. It has been a rewarding experience for all of us.

2) My second task is to offer a perspective

With this in mind, I was pleased to see a Daltiz Memorial Session (Gal, Davis)

I believe I have 4 tasks


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HYP 03 was presented through the eyes of someone standing on the threshold of the 4th stage of strangeness in nuclear physics

However, my perspective is one of “Evolution”As our experimental and theoretical tools are sharpened, weproceed to build structures on top of foundations previouslyconstructed

As illustrated in the Dalitz Memorial Lecture, much of what we do was anticipated by our predcessors

For example, Dalitz predicted the (1405) using a Dalitz plot in 1959.

But, we can also point to others in our field to whom we owe a legacy of ideas


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K- Nuclear bound states(Weise, Iwasaki, Filippi, Kliene, Akaishi, Ramos, Mares)

Of all the topics presented, this generated the most heat, and perhaps also a little illumination

Although the idea of K- nuclear states and K condensationis not new, the prediction by Akaishi and Yamazaki, and subsequent claim of the production of tribaryons and anti-kaon bound states, has recently generated much interest.

However, the KEK observation is now attributed to an experimental artifact, and at least part of the FINUDA observation must be due to FSI

Yet theoretically, K-NN bound states are predicted -The issue is the binding energy and width-


L

S XK- Nuclear bound states

A realistic NN potential with strong

Repulsion saturates the density at ρ ~ 2ρ0


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S XStrange Structures at low Density

Hypernuclear Spectroscopy (Gianotti, LeRose, Hashimoto)

Electromagnetic Decay of Hypernuclei (Tamura, Millener)

Electromagnetic Moments (Tamura, Saito, Lukstins)

Weak Decay of Hypernuclei (Outa, Garbarino)

Kaon and Hyperon Atomic Atoms (Hayano, Curceanu, Rutsetsky, Oller)


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# -B(MeV)

1 -10.94±0.06

2 -8.4±0.2

3 -5.9±0.1

4 -3.8±0.1

5 -1.6±0.2

6 0.27±0.06

7 2.1±0.2

Hypernuclear StructureFINUDA

(Gianotti, Filippi)

12C(K-stop,π-)12

C

Targets 12C, 7Li, 51V

Apply the i

nversion te

st


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Electromagnetic Production - Jlab(LeRose, Hashimoto)

Prel

imin

ary

Prel

imin

ary

Jlab Hall CJlab Hall C

1212 C C (e,e’K(e,e’K++) ) 1212 BB

Jlab Hall AJlab Hall A

Targets Targets 1616OO

77 Li, Li, 2828SiSi


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Value of absolute energyis not important ----------1. Must remain stable – Feedback lock2. Absolute Value/angle – Must be Calibrated

Locus Shifts as Energy and Angles vary


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Hypernuclear γ’s(Tamura, Millener)

V( r ) = V0 + VsSn* SY + VtS12 + Vls(L x S+) + Vals(L x S-)S12 is the usual spin-tensor operatorS+- = ½(Sn +-SY) are the symmetric and anti-symmetric spin operators

Interesting to see that su

mmation and cancellation between

terms works to give a reasonable results.

There are still

Details to resolve , e.g. the 10

B gs sp

litting, and a possib

le

change in Δ for nuclei in the later p shell


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Magnetic Moments(Tamura, Saito, Lukstins)

1 In RMF expect hypernuclear moments to be near the Schmidt limits2 Σ mixing in JN = 0 core corrections small, but for JN = 1 moments can be

suppressed by ~10-20%

Precessionωτ = 0.74 x 10-6 |B| gauss-1


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Weak Decay(Outa, Garbarino)

After much theoretical and experimental work

Γn/Γp seems to be resolved

Main problem was FSI but also heavy meson exchange is required, e.g. σ

However the asymmetry is experimentally very small buttheory predicts a reasonable negative value

A consistent understanding is still lacking


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Single proton/neutron spectra from Single proton/neutron spectra from 55

ΛΛHe and He and 1212ΛΛCC

Calculation byGarbarino et al.

10

W()p = 1 + P α cos()


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10

Note that the mesonic decay seems understood.

I thought I u

nderstood the difference as due to long range

vs short behavior.

If n

ot why the ΔI = ½ rule?

Are other processes important even for Γn/Γp ? (example)


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S XAtomic States

(Hayano, Curceanu, Rutsetsky)

Existing K-atomic He data is not consistent with Z systematics a new measurement is close to publication

Smaller Shift ΔE <10evNew measurement 3Hewith improved resolution,errors


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-500 5000

200

400

600

800

1000

shift 1s [eV]

Dav

ies

et a

l, 19

79

Izyc

ki e

t al,

1980

Bir

d et

al,

1983

Atomic States Kα Hydrogen

SIDDHARTA is an extension to DEAR Kα Shift ~1 ev S/N ~1/4 Kaonic Deuterium

isospin dependent antikaon-nucleon scattering lengths

aK-p = (a0 + a1)/2 aK-n = a1

Shift: 1s = - 193 ± 37 (stat.) ± 6 ev Width: 1s = 249 ± 111 (stat.) ±30ev

wid

th

1

s[e

V]

KpX

Repulsive-type attractiveKpX (KEK)M. Iwasaki et al, 1997

DEAR


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Atomic States Kα Deterium


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Λ production:t-channel and s-channel diagrams play a large roleσL remains “small” from small to large angles, though σLT shows that it is non-zeroTogether, the photo- and electro-production results favor calculations with non-zero

coupling to the D13(1895)Σ0 production:

s-channel diagrams are most important at low energyt-channel/Reggeon exchange dominates when W>2 GeV (above the resonance region)σL and σLT for the Σ0 remain “small” from small to large anglesStrong resonance-like structure in the Σ0 at W=1.9 GeV.

CLAS is providing the first measurements of the interference terms and RLT for scattering angles above 15°

’s are maximally polarized at all energies and Kaon angles when created with a 100% polarized beam. R = 1.0; Cz ≈ Cx + 1 ; 0’s R < 1.

CLAS is providing a consistent data base of production and spin data

Elementary Reactions and Structure(Lenske, Oiler, Hiyama, Nemura, Ahn, Schumacher, Kaiser,

Polinder,Sasaki, Nakai, Fujiwara, Rijken, Savage)

Substantial new data, particularly polarization, and spin transfer data from CLAS, and expect more in the future from LEPS


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Theoretical Input

QM SUf(6) calculations were presented for NN and YN interactions

I=3/2

I=3/2

I=1/2 I=1/2

total total

fss2FSS

Repulsion N(I=3/2) 3S1 is strong.

potentialspotentials

I=1

total

I=0

FSS

potentialspotentials

Shallow pocket at the surface for Ξ


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Theoretical Input

Work continues on the ESC models using OBE SUf(3) consistent nonet interactions Long Range ππ complete YN, YY couplings in SUf(3) 3S1(ΣN, I=3/2) repulsive weakly in ESC04 strongly in ESC06 N p-wave attractive on average

Lattice Calculations show promise QCD → Lattice → EFT → Many body Calculations Lattice Lattice QQCCDD can be an important part of the future of can be an important part of the future of (Hyper-) Nuclear Physics(Hyper-) Nuclear Physics First motion toward rigorous QCD calculations (via EFT’s) of First motion toward rigorous QCD calculations (via EFT’s) of

properties and interactions of nuclei.properties and interactions of nuclei.

All calculations reminded that density

dependence and many-body forces are

important


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Theoretical Input

Structure calculations of light , and other and Ξ hypernuclei

In a systematic calculation of all S-shell single

and double hypernuclei 4 H was bound

but 3 H was not bound


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28MeV

10Be6He 7He 7Li 8Li 9Li 9Be

Ξ Ξ Ξ Ξ Ξ ΞΞ

α +x+N+Ξ

? ? ??

? ??

Spectroscopy of Ξ hypernuclei at J-PARC

α

Ξ

xN =n,p,d,t,3He,α

RG calculations of Ξ hypernucleiShow interesting B Ξ Structuredue to spin, isospin potentialWidths should be small ~6Mev


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1. Coalescence in Heavy Ion Collisions2. Strangelets Strange matter having approximately equal numbers of s,u,and d quarks interacting via QCD e.g. the H3. Hadronic Matter Composite of hadrons interacting by QHD e.g. Neutron Stars 4. Quark matter High temperature and/or high density

Strange Structures at High density/Temperaturemulti-hyperon states

(Senger, Schafner-Bielich, Weber)

Neutron Stars Strange Quark Objects –

Quark Hadronization


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Excitation function of K+ production in A+A collisions: The nuclear matter equation-of-state is soft ( K 200 MeV) Yield and elliptic flow of K+ mesons in A+A collisions: The in-medium potential of K+ mesons is repulsive Yield of K- mesons proton-nucleus collisions: Evidence for a K-N in-medium potential of UK ≈ - 80 /0 MeV Yield and elliptic flow of K- mesons in A+A collisions: Quantitative interpretation of data requires off-shell transport calculations and in-medium spectral functions


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H DibaryonPentaquark Weight Diagram

Required 2 hadron decay

Θ+ and H dibaryonNuclear Density


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(Hicks) CLAS Jlab


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(Yoon)

KEK

No observation eitherabove (or below) threshold


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Be Stable

Binding Energy for systems with at 208 Pb core with N

I and II correspond to different parameter sets

Stability against LL = X p


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Θ+ Stability at higher densities ? (Schaffner-Bielich)

Σ- does not appear becausePotential is repulsive


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New Facilities(Nakamura, Feliciello, Achenbach, Nagae)


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New Facilities(Arends,Nakamura, Feliciello, Achenbach, Nagae)

FINUDA - γ’s and Hyper-fragments -

Production of hyperfragments extends the possibility of hypernuclear -ray measurements

Production of hyperfragments extends the possibility of hypernuclear -ray measurements

Thin Targets helps to identify initial transition levelLow magnetic field New Collaboration formed – Hyper Gamma-

Higher luminosity at DAΦNELow BackgroundClaimed rates are similar to J-PARC

Thin Targets helps to identify initial transition levelLow magnetic field New Collaboration formed – Hyper Gamma-

Higher luminosity at DAΦNELow BackgroundClaimed rates are similar to J-PARC


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New Facilities(Arends, Nakamura, Feliciello, Achenbach, Nagae)

_GSI – PANDA anti-proton → Ξ Ξ

→ capture → hyperfragments

MAMI-C

Upgrade to 1.5 GeV 2010

(e,e’K+)KAOS spectrometer in the forward direction Work begun of the beamlineDetector R&D

Upgrade to 1.5 GeV 2010

(e,e’K+)KAOS spectrometer in the forward direction Work begun of the beamlineDetector R&D

Detection (K-,K+), weak decay + Ge for γ

γ


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J-Lab

Upgrade HESImprovement of rate and resolutionMedium-A systems

Other experiments are under discussion

Upgrade HESImprovement of rate and resolutionMedium-A systems

Other experiments are under discussion


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J-PARC

J-PARC Construction: 2001 ~~70% completed

Beam commissioning: LINAC( Dec., 06), RCS( Sep., 07), MR( May, 08)

Beam from MR: ~ end of 2008

Day-1 Experiments in preparationΞ hypernuclei

Hypernuclear gamma-ray spectroscopyDeeply-bound Kaonic nuclei, etc.


L

S XFrom the Beginning …

to the End

Hypernuclear Physics is more than nuclear physics revisited. It can illuminate features that are obscuredin conventional nuclear systems. It offers a selective probe of the hadronic many-body problem.

It is

of littl

e inter

est to

reproduce

nuclear

physics w

ith st

range b

aryons.

Experimen

ts sh

ould illuminate

a

process

where th

e additio

n of a hypero

n

adds a

unique fea

ture, e.

g. three

body

forces,

“polar

izatio

n” of t

he med

ium,

SU(3) f symmetr

y, etc,


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My 3rd task is also to say THANK YOU

This time to all the organizers, students, assistants, the University administration at Mainz.

You have provided an excellent environment for our conference and for enlightened discussions

My 4th task is to say

I hope to see all of you in 2009 in Japan

L S X Oct. 10-14Hyp2006 Mainz Summary SUMMARY Hyp 2006 - Mainz Ed V. Hungerford University of...

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