Overview Introduction Preproposal for PANDA (What) Plan of Study - - PowerPoint PPT Presentation
PANDA XLII. Collaboration Meeting,10-14 September, Paris, 2012. P. Aslanyan "The High Statistic Study of Exotic Strange Multibaryon States in Subsystems with -Hyperons and K 0 s Mesons at PANDA 11, September, 2012 Overview
s Mesons at PANDA
11, September, 2012 PANDA XLII. Collaboration Meeting,10-14 September, Paris, 2012.
Introduction
Preproposal for PANDA (What)
Plan of Study to prepare proposal for PANDA (How)
Study of in-medium effects with hyperons.
production in p+C collision
Preliminary simulations by FRITIOF forp+C *(1385)+X reaction at 10 GeV/c.
Study of hyperon spectroscopy with primary and secondary targets.
Study of in-medium effects with K0
s mesons.
K0
s production in p+C collision
Preliminary simulations by FRITIOF forp+C K*(890)+X reaction at 10 GeV/c.
Study of spectroscopy with K0
s -mesons.
Study of Hyper-nucleus with secondary target.
and (bar) polarizations Summary
Strange multibaryon states with - hyperon and K0
s meson subsystems has been
studied by using of data from 700000 stereo photographs or 106 inelastic interactions which was obtained from expose 2-m propane bubble chamber LHEP, JINR to proton beams at 10 GeV/c. The observed well-known resonances 0, *+(1385) and K*+(892) from PDG are good tests of this method . The PANDA detector has a unique possibility for high statistic and with 4 geometry study above mentioned states with pC, K-C and -C collisions in the most interesting and a poor study at these energies . The according of PANDA(FAIR) program for primary and secondary targets can divide the obtained results from PBC on three subjects for research, what are following. 1) Study of in-medium effects of hadronic particles. 2) Study of baryon spectroscopy. 3) Study of Hyper-nucleus with secondary target . At present the experimental situation is confused; so is theory. More dedicated, systematic searches are necessary. A survey for new experiments with much improved statistics(more than 10 times compared to those early data would hopefully resolve whether such "exotic“ multi-quark hadron and baryon resonances exist. Reanimation bubble chamber method as secondary active-target for multivertex analysis with power(>100 times faster) new digital and computing technologies ( P02 for JPARC) is most reasonable for next step task for nuclear physics with strangeness too because there are many old interesting results with poor statistic studies specially by this method .
using primary and secondary targets at PANDA.(What) Strange multi-strange clusters are an exiting possibility to explore the properties of cold dense baryonic matter and non-perturbative QCD. The study of (Lambda , p) correlation devoted many experiments at JINR, KEK, FINUDA, FOPI(GSI), OBELIX(CERN), DISTO(SATUYRN), Julich(HIRES) and et al. with different beam probes as K-, p, ,p(bar) and et.al.. There are conflicts for obtained results by invariant mass for mean value and width. Therefore the new planned experiments as CBM(FAIR), PANDA(FAIR), JPARC, AMADEUS, MPD(NICA) et al for hadron-nucleus and nucleus-nucleus collision with high statistic will be usefull to study with different probes too that us allow a better understand property of light and heavy nucleus with strangeness and to answer of many questions. First step(Input data). The evolution of signal/background ratios for Sigma*+ (1385) *(1405),K*(890) and other spectra with Lambda hyperons and K0
s meson
subsystems will be study by different beam probes as (p, p, K-, -) on base of experimental data and models. Development criteria for best signal/background ratios in p +C , K-C and -C reactions will be done . Second step(PANDA-ROOT or output data). What allow to study of PANDA detector. Efficiencies of registration for mentioned multi-strange states included in this report for PANDA detector by using of ROOT(PANDA) will study. Third step. Then proposal forPANDA will be prepare. Welcome joint for collaboration!
production in p+C collision at 10 GeV/C Spherical Coordinate System. =atan2(r1,z);=asin(y/r1);r1=sqrt(x2+y2).Angles without weights for . The comparison of FRTIIOF(URQMD) and experimental data shown that there are enhancement production for hyperons in ranges of < 0(maximum -110),if divided in regions of px<0 and px>0(preliminary) . FRITIOF satisfactory described exp. data for divided by the py
. RE : PBAR P --> X . P IN GEV SIG IN MB
4.00 5.00 6.00 6.90 8.00 9.30 10.0 11.3 12.3 13.3 14.3 16.3 17.3 18.3 20.3 65.3 +- 1.5 62.8 +- 2.0 63.4 +- 1.2 60.3 +- 1.5 60.5 +- 1.5 59.5 +- 1.8 56.0 +- 1.6 54.4 +- 1.8 53.8 +- 1.6 51.5 +- 2.2 52.6 +- 1.8 49.4 +- 1.6 51.5 +- 2.1 49.9 +- 2.2 46.7 +- 3.7
. Numbers Plot Select Plot(?)
Preliminary simulations by FRITIOF forp+C *(1385)+X ractions at 10 GeV/c.
Sigma*+(1385) hyperon production for p+C reaction without Breit- Wigner and experimental errors for 106 inelastic interactions All Sigma*+(1385) by decay channel + (3200 events in peak, 47060 comb ) with undivided positive tracks over momentum
Sigma*+(1385) production more than 5 times larger from p+С reaction. The experimental distribution observed Sigma*+(1385) (600 ev. In peak) by decay channel + for p+C rection at 10GeV/c
The FRTIIOF model and experimental data comparison by the momentum of - shown that there is observed shift for distribution maximum from 200 MeV/c to 100 MeV/c for p+C-X reaction. Sigma*-(1385) hyperon production for p+C reaction
Study of (Lambda,p) spectra for p+C reaction at 10 GeV/c p spectrum only with undivided positive tracks by momentum of P>1 GeV/c(70813 comb) for p+C reaction. There is small reflection(3) from *+(1385) in (2170-2200 ) MeV/c2 mass range of p spectrum
12
STAR Au+Au coll. 200 GeV preliminary
Seen in 2 decay channels. The Sigma- K+channel tags the strangeness content as ssbar --> N0 candidate (Graal) Consistent with a partial wave analysis of old data suggesting two narrow N states at 1680 and/or 1730 MeV width < 30 MeV (nucl- th/0312126, R Arndt et al)
S/(B)=5.15
S Kouznetsov et al, Graal, Trento, Feb 2004 1727 MeV 1750+-18MeV hep-ex/0504026, P Aslanyan et al 1734+-0.5 MeV
(K0
s)spectrum at 10 GeV beam,
JINR 1st International Workshop on Soft Physics in Ultrarelativistic Heavy Ion Collisions (SPHIC06
Decay mode M (MeV/c2) (MeV/c2) S.D.
0 55(PDG) 12.0 + *+(1382) 40(PDG) 12.9 +- *(1600) 55(PDG) 5.5 *(1750) 54(PDG) 4.2 *(1830) 51(PDG) 5.6 - *-(1370) 93 (PDG) 11.3 - (1320)
*- (1480)
p 2100 24 5.7 2150 19 5.7 2220 28 6.1 2310(2270) 30 3.7 2380 32 3.5 2370
pp 3140 40 6.1 3320
K0
s
1750 14 5.6 1795 26 3.3
Table 1. The observed signals from mass spectra with subsystems
= - 1.61 Study of in-medium effects with K0
s mesons
The comparison of FRTIIOF and experimental data shown that there is observed shift maximum for K0
s momentum distribution from 400 MeV/c (FRTIOF) to 900 MeV/c
There are enhancement production for K0
s in ranges of Px<0 for (maximum at -
Preliminary simulations by FRITIOF forK*(890)+X reaction at 10 GeV/c. (K0
s,+) spectrum for p+C reaction at 10 GeV/c without Breit-Wigner
K*(890)+ production more than 10 times larger from p+С reaction.
The FRTIIOF model and experimental data comparison by the momenta of - shown that there is observed shift of distribution maximum from 300 MeV/c to 100 MeV/c for p+CK0
s-X reaction.
V.Blobel et al.(1979), Aachen-CERN-Bonn-Cracow collaboration. CERN Hydrogen Bubble chamber data for K*(890) K0
s identification
Study of (K0
s ,p) spectra for p+C reaction at 10 GeV/c
K0
s p spectrum with undivided positive tracks by momentum of P>1 GeV/c(70813
comb). The maximum of distribution is near 1520 MeV/c2. It could be reflection from (1520) MeV/c2 hyperon from channel (K0
s ,n) or phase space maximum.
K
Pbar +N - + bar : ≈ 2 b;
@Pbar = 3GeV/c : ≈ max @Pbar = 3GeV/c : below production threshold)
bar +N Kbar+ Kbar +p + … [ - production tag] Elastic scattering in nucleus: strong slowing down (a challenge) slowing down in matter (with decay) - capture into atomic levels and hyperatomic cascade Capture into nucleus: Strong and Coulomb forces
Xray
MeV
decay (MWD,NMWD… )
9/11/2012
- N conversion + sticking STRANGENESS IN NUCLEI
heavy neutral H0→Λπ−p dihyperon in the decay length 21 cm from mother star and with mass of MH=2625(Meff.= 2626) MeV/c2 (C.L.=96%) from kinematical fits. The reaction n-p has a kinematical fit (C.L.-22%) . Thus, the second V0 identified only by weak decay of the Λ hyperon at momentum PΛ = 794 MeV/c, which is directed to neutral two-prong star with effective mass Mπp =1836.25 MeV/c2 which is also directed to primary mother interaction(four-prong-star) at beam momentum 10 GeV/c. There is fit with 2=10.8 (C.L. 0.1%) for reaction H0n→Λπ−p n with MH=2225 MeV/c2 too. Three events identified by this topology Photography(or topology) for identified dihyperon by weak decay channel H0→Λπ−p
The missing mass spectra(3428 comb.) for p+N (-K0
s)X reaction with bin
size of 40 MeV/c2. The curve is the sum of the background (by polynomial method 9-order 2/45=88 ) and 2 Breit-Wigner resonance (2/45=56). There is enhancement In the mass range of 3.355 MeV/c2 and 3.00 3H (2991) with exp 90 MeV/c2 ,SD >4.7(>90 events in peak) and with 4.5 (40-50 events).
The missing mass spectra(11118 comb. for p+3HpK0
s X reaction with bin size of 40
MeV/c2. The curve is the sum of the background (by polynomial method 9-order 2/60=137 ) and 1 Breit-Wigner resonance (2/60=126). There is enhancement In the mass range of
6He(5.78 MeV/c2), with exp 90 MeV/c2 ,SD 5.7(>120-150
events in peak).
In missing mass spectrum of p+N X reaction with - events and with bin size of 27 and 40 MeV/c2 for 5659 events. The curve is the sum of the background (by polynomial method 9-order2/109=270 ) and 1 Breit-Wigner resonance (2/109=164). There is enhancement in the mass range of M(3200) MeV/c2), with >90 MeV/c2 ,SD >6(120 events in peak). There is small peak in mass range of 3
H(3050) MeV/c2
as in in missing mass spectrum for all events from p+p X The dashed histogram is simulation by FRITIOF model.
Type of reaction Mass(GeV/c2) S.D. N(p,K0
s)X
3.73(4He) 3.5 N(p,K0
s-)X
3.35 3.00(3
H)
>5.0 4.7 N(p,K0
sp)X
N(p,K0
sp)(p<1GeV/c)
2.58 0.5(Ks
0)
1.02 2.050 3,2 3.1
3H(p,Ks 0p)X
5.78(
6He)
5.7 N(p,)X 3.05 2.20 4.0 3.8 N(p,)X(K+) 3.73(4He) 3.5 N(p,)X(- ) 2.58 4.2 N(p,)X(-) 3.20 6.0
One of explanation is enhancement contributions reflection from hypernucleus.
Three prong star with K0
s . Tape 899(1) k37.
Beam 9.4871 -.01139 1.68008 K0 .66519 -.56858 2.39480
3 H .17231 4.38056 5.71129
p(or +) 7.9802 .00594 1.64052 p (or +) 1.18799 .2526 1.65367
Photography by
3H hypothesis event in exclusive channel of reaction
2 = 0.02/n.d.f.; PROB. = 89 %
p 4
2He --> 3 H + K0 s + p +p, 3 H 3 2He + - .
No fit for p+NY+ K0
s + p ++ reactions , by hypothesis ,0,*(1385) hyperons
-
The projectile secondary negative relativistic track at momentum of P-=1.1 GeV/c, 8.2 cm long, is formed by the beam proton, what is emitted from four prong star. After break of the second part of track is identified as thick solid track, which can registered by relative ionization as
3H in length 2.73 cm and a momentum of
0.870 GeV/c. This track is induced of second vertex . The V0 is identified as a weak decay of a K0
s meson at
negative track from the second vertex is identified as - at momentum of 0.353 MeV/c. Fig. has shown - C
3H+(or -) + K0 s, K0-+, 3H(or ) 3He(n) + -
multi-vertex reaction as candidate for hypernuclear
3H
where we can clear see all stages of multivertex event.
3H identified by weak decay
3He +-
A and hyperons is a fascinating nuclear probe at quark level. By using it, we can study the production of strange quarks from nuclear matter and their larizations. The measurement of hyperons polarization in pp and p p collisions is considered as one of possible tools to study the phase transition.
where P is the () polarization vector, = 0.642 • 0.013 is the decay asymmetry parameter and k is the unit vector along the direction of the outgoing positive decay particle (the proton in case of and the + in case of ). and hyperons polarizations has been study with poor statistics specialy with p induced reactions. Polarization of is equal to 0 what is obtained with poor statistic too .
BNL766
BNL 766 Was designed to study exclusive pp reactions up to 20 charged particles in the final state
new experiments. Because only with the high statistic and with higher resolution stereo images will be possible to observe of new results.
necessary.
angles (maximum -11 to -17o) for production of K0
s , protons and -hyperons(preliminary) .
s ,- ),
(K0
s,p ), ( -) and (p) in direct and the missing mass channel of reaction p+C. Necessary
the study of above spectra will continue to explain of in-medium dependences for the direct and the missing mass channels of reactions by using different methods.One of explanation is reflection of enhancement contributions from hypernucleus.
collaboration data in p +A collisions.
p+C than for p+C interaction at 10 GeV/c.
for p+C interaction at 10 GeV/c.
propose.
necessary.
Establishment of truly exotic hadrons K(bar) bound states
YN scattering experiments -hypernuclei Multi-hypernuclei Dihyperons
Nature is united complex system, more rich and beautiful