johann zmeskal, for the amadeus collaboration stefan meyer institute for subatomic physics vienna,...
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Johann Zmeskal, for the AMADEUS collaboration
Stefan Meyer Institute for subatomic PhysicsVienna, Austria
MESON 2010, Krakow
Recent results and future plans
for AMADEUS11th International Workshop on Meson Production,
Properties and Interaction
Krakow, Poland10-15 June, 2010
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Outline
MESON 2010 JZ
• Introduction, motivation
• AMADEUS programme
• KLOE data analysed by AMADEUS
• AMADEUS - design studies and prototypes
• Summary
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AMADEUS
MESON 2010 JZ
Antikaon
Matter
At
DANE:
Experiments with
Unraveling
Spectroscopy
Eine kleine Nachtmusik
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AMADEUS at DANE 2
MESON 2010 JZ
100 Scientists from about 25 Institutes of 13 Countries
Letter of Indent
Study of deeply bound kaonic nuclear statesat DANE2
March 2006
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Introduction
MESON 2010 JZ
Investigations of antikaon-mediated bound nuclear systems were done, are ongoing or planned at several facilities - KEK, LNF, GSI, J-PARC, CERN-AD
Next-generation experiments should be exclusive, i.e. require the measurement of formation and decay
AMADEUS @ DAΦNE2 aims to perform exclusive measurements - stopped K− in low-density gas targets - unique features available at DAΦNE2 - measurement of all decay particles, charged and neutral, using the KLOE detector
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Motivation
MESON 2010 JZ
proof or disproof the existence of antikaon-mediated bound nuclear
systems
• Study of the antikaon - nucleon/nucleus dynamic at low
energy- information on the modification of the kaon
mass and on N interaction in a nuclear
medium, - study of the restoration of chiral symmetry
hadron mass problem
• (1405)• low-energy antikaon scattering
K
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AMADEUS programme
MESON 2010 JZ
search and study of the kaonic dibaryon states: ppK-
produced in a 3He gas target
search and study of the kaonic 3-baryon states: ppnK- and pnnK-
produced in a 4He gas target
in addition, we plan to extend these studies systematically over a broad range of nuclear targets, like Li, B and Be
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Amadeus programme, cont.
MESON 2010 JZ
low-energy charged kaon cross section on p, d, He-3 and He-4, for K- momentum lower than 100 MeV/c
the K- nuclear interactions in helium (poorly known, based on one paper from 1970 …)
resonance states as (1405) or (1385) will be studied and in addition their behaviour in a nuclear medium
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Tri-baryon systems with S=-1
MESON 2010 JZ
formation process:
K- + 4He ppnK- + n
possible decay channels:
ppnK- + d
+ p + n - + p +
p 0 + d 0 + p + n
L p + - n + 0
S- n + - S0 +
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Tri-baryon systems with S=-1
MESON 2010 JZ
K- + 4He -> n + (ppnK-)
np-
Ld
Lpn S0pn S-pp
pp- (~64%)
Lg
np0 (~36%)
pp-
np0 np0
pp-
n(~500 MeV/c)2p,n,p-
n(~500 MeV/c)2p,n,g,p-
1p,2n,p0,g
n(~500 MeV/c)2p,n,p-
1p,2n,p0
n(~500 MeV/c)p,d,p-
n,d,p0
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Hyperon production
MESON 2010 JZ
K-N Y
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Non-mesonic absorption
MESON 2010 JZ
K-NN YN
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DANE
MESON 2010 JZ
electron – positron collider
collision energy tuned to the Φ resonance at 1.02 GeV c.m.
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DANE 2 for AMADEUS
MESON 2010 JZ
The main features of DANE 2 are:
- low-momentum (127 MeV/c) charged kaons ~ 1200/s at Lint 1033 cm-2s-1
- low momentum spread ( < 0.1%)
- K-pair production in back-to-back topology
- hadronic background intrinsically low (different for extracted beams)
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Schematicside view ofthe KLOE detector
e+ e-
K-
K+
AMADEUS first results
MESON 2010 JZ
The KLOE Drift Chamber is mainlyfilled with 4He (+ 10% isobutane )
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Hadronic interactions of K- in KLOE
MESON 2010 JZ
From MC simulation:
0.1 % K- are stopping in the DC volume
This would lead to about hundred of possible kaonic clusters produced in the 2 fb-1 of KLOE data:
Total amount of KLOE data analyzed, up to an integrated luminosity of ~1,1 fb-1 Oton Vázquez Doce
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MESON 2010 JZ
• Strategy: Search for hadronic interactions with an Λ(1115) involved • Λ → p + π- (64% BR) vertex made by KLOE reconstruction routine• Construct a vertex with Λ + an extra particle
Hadronic interactions of K- in KLOE
y[c
m]
x[cm]
EMC
Topology of analysed events:
CDC
K-
proton
pion
other
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Λ → p + π-
reconstruction
MESON 2010 JZ
KLOE: Minv = 1115,723 ± 0. 003 stat (MeV/c2)
PDG: MΛ = 1115,683 ± 0.006 stat ± 0.006 syst (MeV/c2)
(1.1 fb-1)
σ = 0. 289 ± 0.003 MeV/c2
- dedicated event selection to avoid eloss in the DC wall
- systematics dependent of momentum calibration, evaluated by 2-body decay of K ± :
K± → μ±ν K± → π±π0
Minv pπ (MeV/c2)
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MESON 2010 JZ
Mdeuteron (MeV/c2)
Pdeuteron (MeV/c)Pproton (MeV/c)
Mproton (MeV/c2)
PROTONSselected by dE/dx
DEUTERONSselected by dE/dx
Selection of protons and deuterons• Proton/deuteron candidates are required to have an associated cluster in the EMC and its mass is measured by time of flight.
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Invariant mass analysis of p
MESON 2010 JZ
Minv Λp (MeV/c2)
2Mp+Mπ- 2Mp+MK
Total Yield = 0.03% btb Yield = 0.02%(per stopped K-)
cos θ (Λp)
total events 482 back to back 247
PΛ (MeV/c)
Pp (MeV/c)
Momentum for Lambda and proton:
Preliminary
K-stopped + 4He → n + n + (K-pp)
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- d
MESON 2010 JZ
Λ + d
K-stopped + 4He → n + (K-ppn)
Minv Λd (MeV/c2)
Cos θ (Λd)
PΛ (MeV/c)
Pd (MeV/c)
Momentum of lambda and deuteron:
Md+ Mp+ Mπ- Md + Mp+ MK
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Neutron search
MESON 2010 JZ
=> Outgoing neutrons 400-600 MeV/cKLOE has an
experimentally proved capability for neutron detection (KLOnE)n
EMC
d
π
p
Λ
K-stopped + 4He → n + (K-ppn)
p + π-
Λ + d
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Invariant mass of (Σπ)0
MESON 2010 JZ
Search for Λ(1405)/Λ(1420) - strongly related with the
deeply bound kaonic states prediction
- lack of experimental data
γEMC
π
p
Λ
γ
EMC
γΣ0
π0
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Invariant mass spectra of (Σπ)0
MESON 2010 JZ
MinvΣ0π0 (MeV/c2)
Events in theDC volume
DC wall
approach to (1405)
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Further analysis and future goals
MESON 2010 JZ
• Study background from Σ -> Λγ miss-identification
• Increase “acceptance” by removing EMC (mass by TOF) cut
• Study Σ+π-, Σ-π+ events
• Increase the statistics to the whole 2004-2005 KLOE data set (x2)
• Analyze KLOE 2 data !!!
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AMADEUS @ KLOE
MESON 2010 JZ
Drift Chamber
EMC
7 m
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KLOE electromagnetic calorimeter
MESON 2010 JZ
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Reconstructed Ks mass
MESON 2010 JZ
Photon energy resolution (E)/E = 5.7%xE(GeV)-1/2
time resolution t/t = 54 [ps]xE(GeV)-1/2
Ks oo, with o
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MESON 2010 JZ
Neutron detection efficiency
Threshold at 1 MeVThreshold at 3 MeV
MC simulation, confirmed with measurements at TSL (Uppsala)
neutron energy [MeV]
intr
insi
c eff
icie
ncy
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AMADEUS @ KLOE
MESON 2010 JZ
Drift Chamber
EMC
7 m
AMADEUS setup
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AMADEUS setup I
MESON 2010 JZ
half-cylindrical cryogenic target cell
1st inner-layer ofscintillating fibrefiber size: 1x1mm2
2nd inner-layer ofscintillating fibrefiber size: 1x1mm2
three outer-layersof scintillating fibrefiber size: 1x1mm2
Gas target cell:T = 10 KP = 1.0 barRin = 5 cmRout = 15 cmL = 20 cm
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MESON 2010 JZ
R&D: Test of different SiPMs
Various SiPMs were tested:
Hamamatsu: 1mm2, 3 mm2
Photonique: 1 mm2
Dubna: 1 mm2, 3 mm2
Zecotek: 1 mm2, 3 mm2
Different characteristics :
Number of cells (linearity)Fill factor Q.E. Noise, dark current
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Tracking device:TPC-GEM or3-4 C-GEMs
Target system:cylindrical
cryogenic cell
or active target
Kaon trigger:Scint. fiberswith SiPMs
0.5 m
AMADEUS setup II
MESON 2010 JZ
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MESON 2010 JZ
inner tracker
FEECylindrical GEMs
R&D: Cylindrical GEM
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Summary
MESON 2010 JZ
• The performed analysis reconstructing Λ(1115) has showning excellent capabilities of KLOE to study KN interactions at low energy.
• The capacity to analyze Λp, Λd, Σπ, in a broad kinematic range with high acceptance was shown, a key ingredient for the success of AMADEUS.
• The R& D and design of the AMADEUS apparatus is ongoing and well under control.
Thank you
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MESON 2010 JZ
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Exploring dense nuclear states
MESON 2010 JZ