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Physics Goals of PANDA
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Transcript of Physics Goals of PANDA
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
Physics Goals of PANDA
Introduction – The PANDA Project – PANDA and HESR – Status of the PANDA Project
Physics Program of PANDA – Hadron Spectroscopy – Merits of Antiproton Physics – Properties of Hadrons in Matter – Double -Hypernuclei – Nucleon Structure – Options
Conclusions
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
The PANDA Project
Study pp-reactions (Fixed target) in the p-momentum range from 1.5 - 15 GeV/c,Fixed energy / Beam scan modeTargets: Hydrogen (unpolarized), Nuclear Targets
Typical reactions:
€
p p→ ρ0π0 → π+π−π0
p p(3.1 GeV)→ J /ψ → e+e−
p p→ J /ψ+π→ e+e−+πp p→ DD → KK πKK π; DD +π
Hadron Spectroscopy upto the Charm-Region(Conventional qq and exotic states)
€
p p→ γ(*)γ, e+e− Nucleon Structure
€
p A → J /ψ +(A −1) Properties of Hadrons in Matter
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p A → ΞΞ +X; ΞA'→ ΛΛ A'' Double -Hypernuclei
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
The PANDA Detector (1)
Detector requirements• full angular acceptance and angular resolution for charged particles and , 0
• particle identification (, K , e, ) in the range up to ~ 8 GeV/c• high momentum resolution in a wide energy range• high rate capabilities, especially in interaction point region and forward detector : expected interaction rate ~ 107/s• precise vertex reconstruction for fast decaying particles
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
The PANDA Detector (2)
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
PANDA and HESR
Circumference 574 m Momentum (energy) range
1.5 to 15 GeV/c (0.8-14.1 GeV) Injection of (anti-)protons from
RESR at 3.8 GeV/c Acceleration rate 0.1 GeV/c/s Electron cooling up to 8.9 GeV/c (4.5 MeV electron cooler) Stochastic cooling above
3.8 GeV/c
High Energy Storage Ring (HESR), proposed by P.K.
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
HESR: Parameters
Experiment Mode High Resolution Mode
High Luminosity Mode
Momentum range 1.5 – 8.9 GeV/c 1.5 – 15.0 GeV/c
Target Pellet target with 4*1015 cm-2
Number of stored Antiprotons 1*1010 1*1011
Luminosity 2*1031 cm-2 s-1 2*1032 cm-2 s-1
rms-emittance 1 mm mrad
rms-momentum resolution 10-5 10-4
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
HESR at FAIR
FAIRFacility for Antiproton and Ion Research
HESRHigh Energy Storage RingAntiproton Physics at high Energies
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
Status of the PANDA Project (1)
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
Status of the PANDA Project (2)Example: Simulation of the PANDA interaction region with NEG-coated
beam pipes at SMI
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
Status of the PANDA Project (3)Example: E.-M. Calorimeter (Pb WO4/PWO)
Requirements: Fast Response Good energy resolution, even at
low energies
Development of new crystals PWO (CMS) PWO IIBetter material Increase of light yield ≈ 100%
Operation of crystals at –25°CReduction of thermal quenching Increase of light yield by ≈ 400%
Development of Large Area APD‘s (together with Hamamatsu Photonics)Signals comparable to Photo-Multiplier Readout Operation in high magnetic fields
Best PWO energyresolution, evermeasured
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
PANDA – Hadron Spectroscopy Program (1)
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
PANDA – Hadron Spectroscopy Program (2)Charmonium Spectroscopy (Many Inputs from P.K.)
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
PANDA – Hadron Spectroscopy Program (3)Experiments cc :
c (11S0)experimental error on M > 1 MeV hard to understand in simple quark models
c’ (21S0)
Recently seen by Belle, BaBar, Cleo
Crystal Ball result way off
hc(1P1)
Spin dependence of QQ potentialCompare to triplet P-StatesLQCD NRQCD
States above the DD thresholdHigher vector states not confirmed (3S), (4S) 1st radial excitation of P wave statesNarrow D wave states, only (3770) seenSensitive to long range Spin-dependent potential
Nature of the new X(3872), X(3940), Y(3940) and Z(3940)
9
)(5)(3)( 210 χχχ MMMMcog
++=
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
PANDA – Hadron Spectroscopy Program (4)
Hybrids predicted in various QCD models (LQCD, bag models, flux tubes...)
Some charmonium hybrids predicted to be narrow (exotic
quantum numbers)
Production cross section similar to other charmonia (~150pb)
Charmonium Hybrids
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
PANDA – Hadron Spectroscopy Program (5)
42] K. Juge, J. Kuti, and C. Morningstar, Phys. Rev. Lett. 90, 161601 (2003).
Decay modes:J/; D*D
Small overlapwith cc-states
Exoti
c c c
g
4000MeV/c2
Exoti
c lig
ht
g
1 -- 1-+
0 200010-2
1
102
Charmonium Hybrids
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
PANDA – Hadron Spectroscopy Program (6)
Predictions:
Masses:
1.5-5.0 GeV/c2 (Ground state found? ;
Candidates for further states?)
Quantum numbers:
Several spin exotics (oddballs), e.g.
JPC = 2+- (4.3 GeV/c2 )
Widths: ≥ 100 MeV/c2
– Decay into two lighter glueballs often forbidden because of q.-n.
– No mixing effects for oddballs
Glueballs (gg)
Decays: , ,
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
0− 1− 0+ 1+ 2+ 2−
Ds
Ds*
DsJ*
(2317)
D 1s
D0K
*D K
DsJ(2458)
D 2s*
J P
PANDA – Hadron Spectroscopy Program (7)
Open Charm States
The DS± spectrum |cs> + c.c. was not expected to
reveal any surprises, but ...
– Potential model
– Old measurements
– New observations
(BaBar, CLEO-c, Belle)
Or these are molecules ?
Most recent state (BaBar):
DsJ(2680)+ D0 K+
New observations
Ds0
(2317)*
Ds1
(2458)
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
Merits of Antiprotons (1)
Measured rate
Beam
Resonance cross
section
CM Energy
In pp-annihilation all mesons can be formed
Resolution of the mass and width is only limited by the (excellent) beam momentum resolution
Example: pp χ1,2
J/ e+e–
In contrast: In e+e–-annihilation only JPC = 1-- can be formed
e+e– J/ , e+e– χ1,2
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
Merits of Antiprotons (2)p-beams can be cooled Excellent beam momentum resolution
0.97 1 1.03
rel. ion velocity v/v0
before cooling
after cooling
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
Merits of Antiprotons (3)
Crystal Ball: typical resolution ~ 10 MeV
Fermilab: 240 keV
PANDA: ~20 keV
p/p ~ 10-5 needed
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
Merits of Antiprotons (4)pp-cross sections high Data with very high statistics
Example: pp 000 (LEAR) f0(1500) = best candidate for Glueball ground state
Low final state multiplicities: Clean spectra, Good for PWA analyses
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
Merits of Antiprotons (5)High probability for production of exotic states
Example: pp 00 : (1400) (JPC = 1–+) = candidate for Hybrid ground state^
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
Properties of Hadrons in Matter (1)
p_
~ 1 fm
final state =e+e- / +- / / J/
t ~ 10…20 fm/c
p´s interact with p within 1 fm
At appropiate ECM(pp) J, ´, χc –systems are formed (≈0.8 - 0.9)
Effects to be considered:
Fermi motion of nucleons (≈ 200 MeV) Collisional broadening of states (≈ 20 MeV)
Mass shifts and broadening of cc-states in matter Mass shifts and modifications of spectral functions of open charm states (D±)
Trivial
}Chiral dynamics,Partial restoration of chiral symmetry in hadronic environment
}P.K.,see also talks of T. Yamazaki andN. Herrmann
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
Properties of Hadrons in Matter (2)
Predictions:
1) Hidden charm states (cc):Small mass shifts: 10 - 100 MeV (Gluon Condensate)Sizeable width changes
2) Open charm states (Qq):
Hayaski, PLB 487 (2000) 96Morath, Lee, Weise, priv. Comm.
D
50 MeV
D
D+
K100 MeV
K+
K
25 MeV
Calculation: A. Sibirtsev et al., Eur. Phys. J A6 (1999) 351
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
Properties of Hadrons in Matter (3)
J/ absorption cross section in nuclear matter p + A J/ + (A–1) tot (J/ N) Important for
QGP
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
Hypernuclei open a 3rd dimension (strangeness) in the nuclear chart Double-hypernuclei:
very little data
Baryon-baryon interactions: -N only short ranged (no 1 exchange due to isospin) impossible in scattering reactions
-
3 GeV/c
K+KTrigger
_
secondary target
p
-(dss) p(uud) (uds) (uds)
–
–
Double -Hypernuclei (1)
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
Double -Hypernuclei (2)
Solid state detector (diamond or silicon)compact : thickness ~ 3 cmhigh rate capabilityhigh resolutioncapillar (2D) or pixel (3D)
position sensitive Germanium detector (like Vega or Agata)
Current state of the art detection resolution : 2 KeV (KEK E419)Current state of the art p detection resolution : E = 1.29 MeV Finuda Collaboration, PLB622: 35-44, 2005
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
Nucleon Structure (1)
Timelike GPD´s
Wide AngleCompton Scattering
Prediction (from pp): ≈ 15pb (s = 3.6 GeV) Simulation: Several thousand events/month (|cos|) < 0.6
Problem: Background from 0(420 pb) ; 0 0 (17500 pb)
Spacelike GPD´s
Related processes:
€
p p→ γ+π,ρ,ω,φ
Timelike GPD´s
Annihilation into two Photons: pp
Intermediate energies: Dominance of handbag diagramfor s ≈ 10 GeV2; |t| ≈ s(≈90°)
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
€
p p→ γγ* → l +l −( )
Nucleon Structure (2)
€
⇒ dr k ⊥h1
⊥ x1,r k ⊥( )h 1
⊥ x2,r k ⊥( )∫
Annihilation to:
Comparison between predictions and data Check of Factorisation
Contribution to Parton Distribution Functions: DY-Dilepton-Production:
Boer-Mulders-Function
or
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
Nucleon Structure (3)
€
dσdθ
=πα2h2c2
2xsGM
2 1+cos2 θ*( )+4mp
2
sGE
2 1−cos2θ*( )⎧ ⎨ ⎩
⎫ ⎬ ⎭
Present situation: |GM|timelike ≈ 2xGM spacelike
Assumption: |GE| = |GM|
PANDA: Much wider angular acceptance and higher statistics
Measure for higher Q2
Check timelike/spacelike equalityMeasure |GE| and |GM| separately:
29 GeV2
Timelike Proton Form Factor
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
Physics Program / Further Options (1)– Baryon Spectroscopy
New states, Quantum numbers and decay rates
€
Multi − Strangeness Channels Threshold GeV / c
2
[ ]p
LabGeV / c[ ] σ p p → B B
( )
Δ Δ 2 . 23 1 . 43 100 μ b
Λ Σ 2 . 31
Σ Σ 2 . 39 10 μ b
Λ Σ ( 1385 ) 2 . 50 2 . 20
Λ Λ ( 1405 ) 2 . 52
Λ Λ ( 1520 ) 2 . 64
Ξ Ξ 2 . 64 2 . 62 2 μ b
Ξ Ξ ( 1530 ) 2 . 85
Ω Ω 3 . 35 4 . 93 200 nb
Charmed Channels
Λc
Λ c
4 . 57 10 . 1 20 nb
Λc
Σ c
4 . 74 11 . 0
Σc
Σ c
4 . 91 11 . 9 10 nb
Ξc
Ξ c
4 . 93 12 . 0 0 . 1 nb
Ξc
*
Ξ c
*
5 . 33 14 . 1
Ωc
Ωc
5 . 33 14 . 1 0 . 1 nb
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
Physics Program / Further Options (2)
Direct CP-Violation (SCS)
€
D0 /D 0 − Mixing(r)<10−8(SM) HESR: Δr/r ~10−4
€
CompareD+ → K +K 0* /D− → K −K 0* AsymmetriesA (SM)<10−3
HESR = ΔA /A ≈10−4 −10−3
– CP-Violation in charmed region
€
A ≈α+α α−α
– Direct CP-Violation in , -decays
Compare angular decay asymmetries
Prediction (SM) ≈ 2x10-5 HESR: 1 year of beamtime
€
(α,α ) for Λ → pπ−/Λ → p π+
– Strangeness in Nuclei (Essential input by P.K.)
Use pp-annihilation in nuclei to search for [ppK–], [ppnK–], ...,[p3He], ..., [ (A-1)]-systems
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
Conclusions
Enormous impact in particle physics of p-induced reactions
p-induced reactions have unique features– Nearly all states can be directly produced– High cross sections guarantee high statistics data
p-beams can be cooled very effectively
The planned p-experiments at FAIR will contribute to a further understanding of the non-perturbative sector of QCD
The impact of Paul Kienle to Fair and particularly to the Antiproton Project was enormous as far as physics ideas and technical developments were concerned. Without his constant help and new ideas the project would not have prospered so well.
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
Bild Trento
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H. Koch, SMI/ÖAW Symposium Vienna, September 1, 2006
Lord of Rings