1 pion production in np collisions at 1.25agev a.kurilkin, p.kurilkin, v.ladygin, a.ierusalimov,...
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Pion production in np collisions at 1.25AGeV
A.Kurilkin, P.Kurilkin, V.Ladygin, A.Ierusalimov, T.Vasiliev, LHEP-JINR, Dubna, Russia
For the HADES collaboration
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HADES experiment at SIS18, GSIHADES experiment at SIS18, GSI
– d+p reactions, May 2007:• LVL1 (MULT >2) && FW
– Detector set-up:• LH2 target• 24 MDC• No Start detector• Forward Wall
– Kinematics for np:• Kinetic Energy = 1.25 GeV• Momentum = 1.97 GeV/c• np selection by detecting Proton-spectator in FW
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Introduction• Study of np reaction is important important
to obtain the contribution of isoscalar (I=0) partial waves to the inelastic np collision.
• Study of reactions with single and double pion production in the np collisions at different energies is important for the determination both of the energy dependences of the total np cross section and the contribution of inelastic channels to np interactions.V.V.Sarantsev et. All Eur. Phys.J. A 43, (2010)
J.Bystricky et. all, J. Physique 48 (1987)
?
1.97
np→ppπ-
pp→ppπoHADES
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Experimental data for np→npπ+π- at 1.73 and 2.23 GeV/c
OPE – one pion exchange, OBE – one baryon exchange
The OPER model, developed in ITEP, was chosen to study the reaction mechanisms. [L.Ponomarev. Part. and Nucl., v.7(1), pp. 186-248, 1976, JINR, Dubna].
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Part I : Simulation of the np→npπ+π- reaction
1. Input : OPE+OBE model. (5M np→npπ+π- events) A.P. Jerusalimov
2. HGEANT + Hydra-8.213. PAT (W.Przygoda http://hades-wiki.gsi.de/cgi-bin/viewauth/Homepages/PAT )
The neutron momentum inside the deuteron is taken into account.
http://relnp.jinr.ru/ishepp/presentations/Jerusalimov.pdfhttp://arxiv.org/abs/1102.1574
OPE+OBE
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Predictions of OPE+OBE model if full phase space
and contribution of OPE and OBE mechanisms to OPE+OBE.
π- π+
In HADES acceptance In HADES acceptance
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Part II : Experimental data analysis
1. Exp. [email protected]/u (MAY07)
2. DST gen2 with Hydra-8.21
3. PAT (selection the reaction channels)(W.Przygoda http://hades-wiki.gsi.de/cgi-bin/viewauth/Homepages/PAT )
4. PostPAT analysis.
Selection of np interactions from dp : LVL1 trigger (MULT >2) && FW Proton-spectator in the FW, 1.6GeV/c<Psp<2.6GeV/c
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Part II : Event identification
In order to perform particle identification following cuts are applied in the analysis:
1. PID cuts for single particle : p, π- , π+
beta vs momenta dE/dx in MDC(inner & outer)2. Cut on momentum of Proton-spectator 1.6GeV/c<Psp<2.6GeV/c
Analysis is performed using the PAT framework. Beta is reconstructed using particle hypotheses.
(W.Przygoda http://hades-wiki.gsi.de/cgi-bin/viewauth/Homepages/PAT )
Post PAT analysis cuts.
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Part II : Raw distributions
Θlab(π+)
Θlab(π-)Minv(π+π-)
M2miss
TOF/TOFINO overlap
Exp.data Simulation
Simulation
Θlab(π+)
Θlab(π-)
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Part III : Efficiency and Acceptance corrections
1. Vertex reconstruction. (real data is used)
2. Pluto : White noise generation
3. HGEANT+Hydra-8.21
4. Analysis Sim. DST
5. Single track : Acceptance and Efficiency matrices.5. Single track : Acceptance and Efficiency matrices.
References: http://hades-wiki.gsi.de/cgi-bin/view/SimAna/Apr06TrackEmedding?rev=1.13http://www.e12.physik.tu-muenchen.de/~lfabbi/analysis/effNov02/effNov02.html
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Part III : Efficiency and Acceptance corrections
Hydra-8.21:Input Pluto : Uniform single tracks (p,cos(Θlab),φ)(~350 MEvent for pions, ~700 MEvent for proton and deuteron ) Accepted: Hits in MDC1-4, TOF, TOFINO, SHOWER
Reconstruction: RK (single track), RK+PIDCorrection matrices: Acceptance = Accepted/InputEfficiency = RK /AcceptedEfficiency_with_PID = (RK+PID)/Accepted
Binning : φ - 2o , (range : -180 o – 180 o) Θ – 1o, (range : 0 o – 90 o) p - 50 MeV(0 – 2 GeV for pions, 0 – 3 GeV for proton)
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Part III: Acceptance and Efficiency matrices of π- (Slice - 50 MeV)
Acceptance
RK Efficiency
(RK+PID) Efficiency
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Part III: Acceptance and Efficiency matrices of π+ (Slice - 50 MeV)
Acceptance
(RK+PID) Efficiency
RK Efficiency
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Part III: Acceptance and Efficiency matrices of proton (Slice - 50 MeV)
Acceptance
(RK+PID) Efficiency
RK Efficiency
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Normalization:
Scalling = 4 (LVL1) ;
eventsmbN pp
pp 910)25.085.3(
0
0**
NdM
dNScalling
dM
d
inv
pp
pp
http://hades-wiki.gsi.de/pub/SimAna/ NormalizationForPpAndDp/pp_elastic260109.pdf
Part IV: Comparison of experimental data and OPER simulation
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Part IV: Comparison of experimental and simulation data
Efficiency corrected distributions : Eff = Eff. π+ * Eff. π- * Eff. p
Preliminary
Preliminary
Preliminary
Preliminary
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Part IV: Comparison of experimental and simulation data
The same analysis procedure is used for sim. and exp.data
Preliminary
m2n
OpenAngle(π+π-)
π-π+ p
Preliminary
OpenAngle(pπ+)
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Summary
• Single track Efficiency and Acceptence matrices
for d, p, π+, π- are obtained.
• The preliminary results for the np→npπ+π- reactions
at 1.25 GeV corrected by the efficiency are obtained.
• OPER model prediction for the np→npπ+π- reaction shows the reasonable agreement with experimental data.
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Acknowlengements
We would like to thank W.Przygoda, A.Rustamov, V.Pechenov, O.Pechenova, K.Lapidus, T.Galatyuk, G.Agakishiev and other people who helped us in our analysis!!!
and thank you all
for your attention!!!
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Model : OPE + OBE (A.P.Ierusalimov)
diagrams OPE
diagrams OBE
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Experimental distributions for np→npπ+π- at p 1.73 GeV/c
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TOF and TOFINO detectors
TOFINOTOF 24
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HADES setup
1
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Exp. Data
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