friday, december 10, 2010
DESCRIPTION
Studies of antikaon interactions with nucleons at DA Φ NE. Oton Vázquez Doce LNF - INFN. Friday, December 10, 2010. DA Φ NE AMADEUS KLOE data analysis. Colosseo 70–80 AD Ø 545 m. 17 km. DA Φ NE 2008 AD (upgrade) Ø 200 m. - PowerPoint PPT PresentationTRANSCRIPT
Friday, December 10, 2010
Oton Vázquez DoceLNF - INFN
Studies of antikaon interactions with nucleons at DAΦNE
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS KLOE data analysis
17 km
Colosseo 70–80 AD Ø 545 m
DAΦNE 2008 AD (upgrade) Ø 200 m
The DAΦNE e+e- collider
• e+ e- beams at ~ 500 MeV/c•Φ → K+ K- (49.1%)•Monochromatic low-energy K- (~127 MeV/c)•Low hadronic background due to beam characteristics (compared with hadron beam lines, as KEK)
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE upgrade in 2008 Design of new interaction region scheme
Top luminosity reached during SIDDHARTA run:4x1032 pb-1 s-1
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS KLOE data analysis
Experimental timeline at DAΦNE
DEAR kaonic hydrogen
FINUDA hypernuclei
KLOE CP violation
SIDDHARTA kaonic atoms
KLOE2
AMADEUS* kaonic nuclei
past
present
proposal for the future
(KLOE2+) SIDDHARTA2*
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS KLOE data analysis
next talk in this session by S. Okada
How deep is the KN potential?
KLOE DC The AMADEUS experiment
• Search for the kaonic nuclear clusters• Characterize the hadronic interactions and
scattering of K- in light nuclei• doing it by implementing new devices in the inner
region of the KLOE detector for studying the (most) fundamental antikaon bound nuclear systems
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS KLOE data analysis
A hadron physics important and unresolved topic: How the hadronic masses and interaction change in nuclear medium
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS: kaonic clusters KLOE data analysis
A hadron physics important and unresolved topic: How the hadronic masses and interaction change in nuclear medium
Y. Akaishi and T. Yamazaki (Phys. Rev. C65 (2002) 044005)
Strong attractive I=0 KN interaction favors discrete nuclear states high B and small Γ .
Discussion triggered by the prediction of the Deeply bound kaonic nuclear states
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS: kaonic clusters KLOE data analysis
A hadron physics important and unresolved topic: How the hadronic masses and interaction change in nuclear medium
Y. Akaishi and T. Yamazaki (Phys. Rev. C65 (2002) 044005)
Strong attractive I=0 KN interaction favors discrete nuclear states high B and small Γ .
Discussion triggered by the prediction of the Deeply bound kaonic nuclear states
Deeply bound kaonic nuclear states require the presence of a strong attractive KN interaction in the isospin I=0 channel
From experimental data:• S-wave K- nucleon scattering length is negative at threshold
“repulsive type” interaction
KN potential strongly dependent on density: → repulsive in free space → attractive in nuclear matter
• K line shift of kaonic hydrogen is negative
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS: kaonic clusters KLOE data analysis
K‐N interactions @ DAΦNE Oton Vázquez Doce
A strong attractive potential will allow the formation of deeply bound kaonic clusters, with exotic features that would allow to investigate:
- spontaneous and explicit symmetry breaking of QCD- kaon condensation in nuclear matter (neutron stars)- super dense matter (x5 normal nuclear matter)
etc
Studying the properties of the KN potential in the nuclear medium
DAΦNE AMADEUS: kaonic clusters KLOE data analysis
K‐N interactions @ DAΦNE Oton Vázquez Doce
A strong attractive potential will allow the formation of deeply bound kaonic clusters, with exotic features that would allow to investigate:
- spontaneous and explicit symmetry breaking of QCD- kaon condensation in nuclear matter (neutron stars)- super dense matter (x5 normal nuclear matter)
etc
Studying the properties of the KN potential in the nuclear medium
DAΦNE AMADEUS: kaonic clusters KLOE data analysis
Intense theoretical debate with several different approaches:- Few-body calculations solving Faddeev equations - Variational calculations with phenomenological KN potential- KN effective interactions based on Chiral SU(3) dynamics
K‐N interactions @ DAΦNE Oton Vázquez Doce
A strong attractive potential will allow the formation of deeply bound kaonic clusters, with exotic features that would allow to investigate:
- spontaneous and explicit symmetry breaking of QCD- kaon condensation in nuclear matter (neutron stars)- super dense matter (x5 normal nuclear matter)
etc
Studying the properties of the KN potential in the nuclear medium
DAΦNE AMADEUS: kaonic clusters KLOE data analysis
Intense theoretical debate with several different approaches:- Few-body calculations solving Faddeev equations - Variational calculations with phenomenological KN potential- KN effective interactions based on Chiral SU(3) dynamics
For K-pp system, predicted values both for B and Γexpand over the range from 0 to 200 MeV
KK
ΛpExperimental results from FINUDA
ΛdK- stopped in light nucleiInvariant mass spectroscopy
kaonic 3-baryon state: ppnK-
kaonic dibaryon state: ppK-
Experimental data
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS: kaonic clusters KLOE data analysis
KK
ΛpExperimental results from FINUDA
ΛdK- stopped in light nucleiInvariant mass spectroscopy Λd
Results from KEK:Λp
Λd
K- stopped in 4HeInvariant mass spectroscopy
kaonic 3-baryon state: ppnK-
kaonic dibaryon state: ppK-
Experimental data
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS: kaonic clusters KLOE data analysis
KK
ΛpExperimental results from FINUDA
ΛdK- stopped in light nucleiInvariant mass spectroscopy Λd
Results from KEK:Λp
Λd
K- stopped in 4HeInvariant mass spectroscopy
p¯ 4He annihilationDISTO Λp OBELIX Λp
p+p → K++X p4He annihilation (Λd)
kaonic 3-baryon state: ppnK-
kaonic dibaryon state: ppK-
Experimental data
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS: kaonic clusters KLOE analysis
KK
ΛpExperimental results from FINUDA
ΛdK- stopped in light nucleiInvariant mass spectroscopy Λd
Results from KEK:Λp
Λd
K- stopped in 4HeInvariant mass spectroscopy
p¯ 4He annihilationDISTO Λp OBELIX Λp
p+p → K++X p4He annihilation (Λd)
kaonic 3-baryon state: ppnK-
kaonic dibaryon state: ppK-
Experimental data
KK
ΛpExperimental results from FOPI
Λdfrom HEAVY ION COLLISIONS
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS: kaonic clusters KLOE analysis
Nucl.Phys.A835:51-58,2010. arXiv:1001.1300
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS: kaonic clusters KLOE data analysis
Nucl.Phys.A835:51-58,2010. arXiv:1001.1300
the future experiments in Japan at J-PARC will produce kaonic nuclear states only with K--induced reactions in- flight (E15; E17)
alternative approaches followed at GSI with FOPI using proton-nucleus collisions at beam energies close to the strangeness production threshold and with nucleus- nucleus collisions
a dedicated facility – AMADEUS at DANE will study antikaon-mediated bound nuclear systems with K- induced reactions at rest
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS: kaonic clusters KLOE data analysis
AMADEUS: The main program
kaonic 3-baryon states: ppnK- and pnnK-
produced in a 4He gas target
kaonic dibaryon states: ppK- and pnK-
produced in a 3He gas targetStudy the most fundamental antikaon deeply bound systems in formation and decay processes:
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS: experimental program KLOE data analysis
AMADEUS: extended program
Low-energy charged kaon cross section on p, d, He-3 and He-4, for K- momentum lower than 100 MeV/c (missing today)
The K- nuclear interactions in Helium (poorly known – based on one paper from 1970…)
Properties of Λ and charged Σ´s for example decays in channels with a neutrino → astrophysics implications (cooling of compact stars)
Resonance states as Λ(1405) or the Σ(1385) could be understood with high statistics; their behaviour in nuclear medium can be studied too
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS: experimental program KLOE data analysis
AMADEUS: three key features
Full acceptancy
Full reconstruction
Invariant mass +Missing mass
Pureness
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS: experimental program KLOE data analysis
From KLOE to AMADEUS Full acceptance and high precision measurements will be made by implementing the KLOE detector with an inner AMADEUS setup(50 cm. gap in KLOE DC around the beam pipe)
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS setup KLOE data analysis
DRIFT CHAMBER
ELECTROMANETIC CALORIMETER
Almost full acceptancy 4π:
From KLOE to AMADEUS
Setup for AMADEUSwithin KLOE:
Full acceptance and high precision measurements will be made by implementing the KLOE detector with an inner AMADEUS setup(50 cm. gap in KLOE DC around the beam pipe)
K-stopped + 4He → n + (K-ppn)
K-stopped + 4He → p + (K-pnn)
• Modification of the beam pipe of KLOE-2 in order to allow access
• Target ( A gaseous He target for a first phase of study)
• Trigger (1 or 2 layers of ScFi surrounding the interaction point)
• Inner tracker (eventually, a first tracking stage before the DC)
The implementation of the AMADEUS dedicated setup around the beam pipe will modify the topology of the events, stopping the K- in a target inner to the DC.
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS setup KLOE data analysis
KLOE2
AMADEUS
Central region made of CARBON FIBER:- Vacuum chamber- External part of cryostate and target walls
Aluminium for the peripheral part
AMADEUS setup: beam pipe
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS setup KLOE data analysis
Low-mass cryogenic gas target cell:T = 10 KP = 1.0 barRin = 5 cmRout = 15 cmL = 20 cm
working T 22 K working P 1.5 bar Alu-gridSide wall: Kapton 50 µmEntrance window: Kapton 50 µm
SIDDHARTA
AMADEUS:
AMADEUS setup: target cell
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS setup KLOE data analysis
Low-mass cryogenic gas target cell:T = 10 KP = 1.0 barRin = 5 cmRout = 15 cmL = 20 cm
working T 22 K working P 1.5 bar Alu-gridSide wall: Kapton 50 µmEntrance window: Kapton 50 µm
AMADEUS:
AMADEUS setup: target cellAMADEUS Monte Carlo
SIDDHARTA Monte Carlo
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS setup KLOE data analysis
SIDDHARTA
AMADEUS setup: Trigger system
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS setup KLOE data analysis
AMADEUS setup: Trigger system
Ideal for ScFi couplin and high granularity detectorTime resolution below 1 nsInsensitive to strong magnetic fieldsHigh gain (>106) and quantum efficiency
MPPC Hamamatsu S10362-11-050U, efective area 1mm2,,400 pixel wlorking biases ̴ 70 V .
Instrumented fibers: Saint Gobain BCF- 10 single cladding:
- Emission peak 432 nm- Decay time 2,7 ns- 1/e 2.2 m- 80000 ph./MeV
Silicon photomultipliers + scintilliating fibers
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS setup KLOE data analysis
Laser directly on SiPM; 1 KhzRes ≈ 40 ps
Amplifier is not worsening!
Laser directly on fiber:Resolution is slightly worse ≈ 80 ps due to internal reflexion
TIME RESOLUTION STUDY@ Roma3 University
SiPM + Pre-amp + scintilliating fiber
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS setup KLOE data analysis
tests installation at DAΦNE
SIDDHARTA setup
DAΦNE beam pipe
Our test setup
Siddharta Kaon Monitor2Layers of Scintillators up&downThe interaction point detecting K+ K- emmited in opposite directions
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS setup KLOE data analysis
tests installation at DAΦNE
SIDDHARTA setup
DAΦNE beam pipe
Our test setup
Siddharta Kaon Monitor2Layers of Scintillators up&downThe interaction point detecting K+ K- emmited in opposite directions
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS setup KLOE data analysis
AMADEUS setup: Trigger systemNew TEST SETUP
Test beam at BTF in Frascati and past at PSI (Zurich) wiht hadrons
2-rings of double layer 16 fibres
64 fast pre-amplifiers (64x)
2 boards of 32 constant fraction discriminator with zero jitter
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS setup KLOE data analysis
AMADEUS setup: Trigger systemNew TEST SETUP
Test beam at BTF in Frascati and past at PSI (Zurich) wiht hadrons
2-rings of double layer 16 fibres
64 fast pre-amplifiers (64x)
2 boards of 32 constant fraction discriminator with zero jitter
Pion an electron fluxes in piM1
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS setup KLOE data analysis
Experimental timeline at DAΦNE
DEAR kaonic hydrogen
FINUDA hypernuclei
KLOE CP violation
SIDDHARTA kanonic atoms
KLOE2
AMADEUS* kaonic nuclei
past
present
proposal for the future
(KLOE2+) SIDDHARTA2*
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS KLOE data analysis
The KLOE detector
KLOE@ DAΦNE
DRIFT CHAMBER- 90% He- momentum resolution ~ 0.4%
ELECTROMANETIC CALORIMETER- σE/E= 5.7%/√E (GeV)
Almost full acceptancy 4π:
K‐N interactions @ DAΦNE Oton Vázquez Doce
for CPT symmetry and QM tests, hadronic physics, and more
by S. Miscetti @ QuarkConfinement IX. Madrid, 2010
Status of KLOE2. arXiv:1001.3591, G. Venanzoni for the KLOE2 collaboration
DAΦNE AMADEUS KLOE data analysis
KLOE data analysys:
EMC
Drift Chamber
The implementation of the AMADEUS dedicated setup will modify the topology of the events, stopping the K- in a target inner to the DC.
K-
K+
4He
how K+/K- events looks like nowadays in KLOE:
e+
e-
•The Drift Chamber of KLOE contains mailny 4He (90%, 10% isobutane)
•From analysis of KLOE data and Monte Carlo: 0.1 % of K- shouldstop in the DC volume
•This would lead to hundredsof events with K- hadronic interactions at rest
“AMADEUS Step-0”
- Test the behaviour of the KLOE detectorfor hadronic physics purposes- Possibility to study the phenomenon with an active target
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE SIDDHARTA AMADEUS KLOE data analysis
Λ + pK-
stopped + 4He → n + n + (K-pp)
Λ + dK-
stopped + 4He → n + (K-ppn)
•Statistics: analyzing data up to an integrated luminosity of ~1,7 fb-1 (80% KLOE RUNS 2004/2005)•Data analysis: search for hadronic interactions with Λ(1115):
• Λ → p + π- (64% BR)• Construct a vertex with Λ + an extra particle
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS KLOE data analysis
Λ + pK-
stopped + 4He → n + n + (K-pp)
Λ + dK-
stopped + 4He → n + (K-ppn)
•Statistics: analyzing data up to an integrated luminosity of ~1,7 fb-1 (80% KLOE RUNS 2004/2005)•Data analysis: search for hadronic interactions with Λ(1115):
• Λ → p + π- (64% BR)• Construct a vertex with Λ + an extra particle
K‐N interactions @ DAΦNE Oton Vázquez Doce
deuterons
protons
•Protons and deuterons are firstly selected from the spectrum of particles near to the Lambda vertex by dE/dx
EMC
charge * p(MeV/c)
dE/d
x (a
dc co
unts
)protons
deuteronsDC
charge * p(MeV/c)
E (M
eV/c
)
PID
DAΦNE AMADEUS KLOE data analysis
protonpion
kaonother
DC volumeEcal
x (cm)
y (c
m) Λ + p
Λ + d
2 different vertices reconstrucion:Λ -> p + pion(K- + 4He) -> Λ + d
Proton from Λ Are required to have at least 1 clusterDeuteron /proton to reproduce the time of the event
- Calculate p/d mass by TOF-Evaluate Σ0 background-Use Λ lifetime as quality cut
Kaon is rarely tracked due to its low momentum or short trackCluster in the ECAL
(time info)
Selection of events
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS KLOE data analysis
Selection of events
Proton from Λ Are required to have at least 1 clusterDeuteron /proton to reproduce the time of the event
- Calculate p/d mass by TOF-Evaluate Σ0 background-Use Λ lifetime as quality cut
• Proton/deuteron candidates are required to have an associated cluster in the EMC and its mass is measured by time of flight.
Mdeuteron (MeV/c2) Time (ns)
1/3.7 -> τ=0.25 ns (PDG=0.26)
LAMBDA LIFETIME
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS KLOE data analysis
Improved Λd vertex reconstruction
Vertex radial position (cm)
Λ -> p+πΛ+d
Improved selection of events in DC-gasΛd vertex
Λ vertex
Selection of events
Proton from Λ Are required to have at least 1 clusterDeuteron /proton to reproduce the time of the event
- Calculate p/d mass by TOF-Evaluate Σ0 background-Use Λ lifetime as quality cut
• Proton/deuteron candidates are required to have an associated cluster in the EMC and its mass is measured by time of flight.
Mdeuteron (MeV/c2) Time (ns)
1/3.7 -> τ=0.25 ns (PDG=0.26)
LAMBDA LIFETIME
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS KLOE data analysis
KLOE: statistical error 0. 003 MeV/c2
PDG: MΛ = 1115,683 ± 0.006 stat ± 0.006 syst (MeV/c2)
Λ → p + π-
Invariant masses Preliminary
Minv pπ (MeV/c2)
K‐N interactions @ DAΦNE Oton Vázquez Doce
σ = 0. 289 ± 0.003 MeV/c2
DAΦNE AMADEUS KLOE data analysis
KLOE: statistical error 0.003 MeV/c2
PDG: MΛ = 1115,683 ± 0.006 stat ± 0.006 syst (MeV/c2)
σ = 0. 289 ± 0.003 MeV/c2
Λ → p + π-
Invariant masses Preliminary
Minv pπ (MeV/c2)
Minv Λd (MeV/c2)
Total events in DC Volume 79
Md+ Mp+ Mπ- Md + Mp+ MK
Λd analysis
PΛ (MeV/c)
Pd (MeV/c)
Efficency for tracks with P < 400 MeV improved increased acceptancy
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS KLOE data analysis
Λ + d
K-stopped + 4He → n + (K-ppn)Λd analysis
Neutral particles detection
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS KLOE data analysis
Λ + d
K-stopped + 4He → n + (K-ppn)Λd analysis
Neutral particles detection
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS KLOE data analysis
Λ -> n π0
proton
π
p
Λ
Ecal
Σ0
Use of the time information from the EMC
-With the extrapolation of the charged andneutral (lambda) tracks the time of theInteraction (Tk) is obtained
Time correlation between neutral clusters(not associated to any charged track) and Tkassuming a photon travelling:
Tphoton -Tk (MeV/c)
Tk
Minv γγ (MeV/c2)
Σ0 contamination in Λp events
Neutral particles detection
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS KLOE data analysis
...on the nature of the Λ(1405)
γ Ecal
π
p
Λ
γ
Ecal
γΣ0
π0
• 3-quark baryon?• KN quasibound state?• two pole KN-Σπ channel coupling?
(Σπ)0 spectrum
D. Jido, E. Oset and T. Sekihara,``Kaonic production of Lambda(1405) off deuteron target in chiral dynamics''
arXiv:0904.3410 [nucl-th].
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS KLOE data analysis
possible task for AMADEUS?
...on the nature of the Λ(1405)
γ Ecal
π
p
Λ
γ
Ecal
γΣ0
π0
• 3-quark baryon?• KN quasibound state?• two pole KN-Σπ channel coupling?
(Σπ)0 spectrum
pseudo-kinematic fit:•χ2 computing:
-momentum of proton and pion-Covariance matrix elements for every track-time and positions plus resolutions for photons
•Allows to reject background selecting the right combination of photons•Constraints: Δt for the arrival time of photons•No mass assumption -> unbiased mass spectras
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS KLOE data analysis
...on the nature of the Λ(1405)
γ Ecal
π
p
Λ
γ
Ecal
γΣ0
π0
• 3-quark baryon?• KN quasibound state?• two pole KN-Σπ channel coupling?
(Σπ)0 spectrum
Kinematic fit:•χ2 computing:
-momentum of proton and pion-Covariance matrix elements for every track-time and positions plus resolutions for photons
•Allows to reject background selecting the right combination of photons•Constraints: Δt for the arrival time of photons•No mass assumption -> unbiased mass spectras
Minv Λγ (MeV/c2)
Min
v γγ
(MeV
/c2 )
Minv γγ (MeV/c2) Minv Λγ (MeV/c2)
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS KLOE data analysis
(Σπ)0 spectrum
MinvΣ0π0 (MeV/c2)
Events in theDC volume
DC wall
Preliminary
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE AMADEUS KLOE data analysis
K‐N interactions @ DAΦNE Oton Vázquez Doce
K- He interactions in KLOEPROVED
• Capabilities of the KLOE detector for studying K- hadronic interactions
• Possibility to study the phenomenon with an active target
TO DO LIST• Apply acceptance correction for invariant masses distributions
• Evaluate background distributions (hadronic interaction, multi-nucleon absorption, etc) for the analises shown previously (Monte Carlo)
• Exploit the neutral particles detection capabilities of KLOE (Kppn -> Λ d n, neutral decay of Λ , etc)
• Determine rates for the different reactions in 4He and in 12C
• Exotic (and not so) physics data:) hypernuclei, Σ(1385), etc.
• New KLOE data!
DAΦNE AMADEUS KLOE data analysis
K‐N interactions @ DAΦNE Oton Vázquez Doce
Studies of antikaon interactions with nucleons at DAΦNE
CONCLUSIONS
DAΦNE AMADEUS conclusions KLOE data analysis
DAΦNE AMADEUS conclusions KLOE data analysis
K‐N interactions @ DAΦNE Oton Vázquez Doce
Studies of antikaon interactions with nucleons at DAΦNE
CONCLUSIONSMinutes from last LNF Scientific Committee
THANK-S
AMADEUS setup: TPG for inner tracking
Prototype tested last week at BTF
K‐N interactions @ DAΦNE Oton Vázquez Doce
DAΦNE SIDDHARTA AMADEUS: experimental setup KLOE
Λ p analysisInvariant mass
Minv Λp (MeV/c2)
Total events in DC Volume 187
2Mp+Mπ- 2Mp+MK
PΛ (MeV/c)
P p (M
eV/c
)
Minv Λp (MeV/c2)
Pp (MeV/c)
NO EMC-CLUSTER (mass by TOF)requirement for protons !!!!
Rely only on DEDX in the DC wires -->
charge * p(MeV/c)
dE/dx (adc counts)
protons
Preliminary
dE/d
x (a
dc co
unts
)deuterons
triton
protons
Selection of triton PID
K‐He interactions in KLOE Oton Vázquez Doce
Mass by time of flight (MeV/c2)
triton
Cos θ (Λt)MΛ(MeV/c2)
PΛ (MeV/c)
Mt (MeV/c2)
Pt (MeV/c)
Lambda-triton
K‐He interactions in KLOE Oton Vázquez Doce
triton
Cos θ (Λt)MΛ(MeV/c2)
PΛ (MeV/c)
Mt (MeV/c2)
Pt (MeV/c)
Minv Λt (MeV/c2)
ρ < 40 cmDC inner wall
ρ > 40cmDC volume
Lambda-triton
K‐He interactions in KLOE Oton Vázquez Doce