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 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 for p+C *(1385) + X reaction at 10 GeV/c. Study of hyperon spectroscopy with primary and secondary targets. Study of in-medium effects with K 0 s mesons. s production in p+C collision K 0 Preliminary simulations by FRITIOF for p+C K*(890) + X reaction at 10 GeV/c. Study of spectroscopy with K 0 s -mesons. Study of Hyper-nucleus with secondary target. Dihyperons(topology) and (bar) polarizations Summary
Introduction Strange multibaryon states with - hyperon and K 0 s meson subsystems has been studied by using of data from 700000 stereo photographs or 10 6 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 .
Preproposal. High statistic study of exotic states with Lambda hyperon subsystems by 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 K 0 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 for PANDA 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(x 2 +y 2 ).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 -11 0 ),if divided in regions of p x <0 and p x >0(preliminary) . FRITIOF satisfactory described exp. data for divided by the p y
Preliminary simulations by FRITIOF for p+C *(1385) + X ractions at 10 GeV/c. . RE : PBAR P --> X . P IN GEV SIG IN MB 4.00 65.3 +- 1.5 5.00 62.8 +- 2.0 6.00 63.4 +- 1.2 6.90 60.3 +- 1.5 8.00 60.5 +- 1.5 9.30 59.5 +- 1.8 10.0 56.0 +- 1.6 11.3 54.4 +- 1.8 12.3 53.8 +- 1.6 13.3 51.5 +- 2.2 14.3 52.6 +- 1.8 16.3 49.4 +- 1.6 17.3 51.5 +- 2.1 18.3 49.9 +- 2.2 20.3 46.7 +- 3.7 Numbers . Plot Select Plot(?)
Sigma* + (1385) hyperon production for p+C reaction without Breit- Wigner and experimental errors for 10 6 inelastic interactions All Sigma* + (1385) by decay channel + The experimental distribution observed (3200 events in peak, 47060 comb ) with Sigma* + (1385) (600 ev. In peak) by decay undivided positive tracks over momentum channel + for p+C rection at 10GeV/c of P >1 GeV/c for p+C.The Sigma* + (1385) production more than 5 times larger from p+ С reaction.
Sigma* -( 1385) hyperon production for p+C reaction 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.
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/c 2 mass range of p spectrum
1 st International Workshop on Soft Physics in Ultrarelativistic Heavy Ion Collisions (SPHIC06 S Kouznetsov et al, Graal, Trento, STAR Au+Au coll. 200 GeV preliminary Feb 2004 S. Kabana et al, hep-ex/0406032 S/ (B)=5.15 1734+-0.5 MeV hep-ex/0504026, P Aslanyan et al 1727 MeV Seen in 2 decay channels. The Sigma- 1750+-18MeV 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- ( K 0 s )spectrum at 10 GeV beam, th/0312126, R Arndt et al) JINR 12
Table 1. The observed signals from mass spectra with subsystems (MeV/c 2 ) M (MeV/c 2 ) Decay mode 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) - 3.0 * - (1480) - 3.2 p 2100 24 5.7 2150 19 5.7 2220 28 6.1 2310(2270) 30 3.7 2380 32 3.5 2370 - 4.5 pp 3140 40 6.1 3320 - 4.8 K 0 s 1750 14 5.6 1795 26 3.3
Study of in-medium effects with K 0 s mesons = - 1.61 The comparison of FRTIIOF and experimental data shown that there is observed shift maximum for K 0 s momentum distribution from 400 MeV/c (FRTIOF) to 900 MeV/c
s in ranges of Px<0 for (maximum at - There are enhancement production for K 0 -11 0 ) (preliminary).
Preliminary simulations by FRITIOF for K*(890) + X reaction at 10 GeV/c. s , +) spectrum for p+C reaction at 10 GeV/c without Breit-Wigner (K 0 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+C K 0 s - X reaction.
V.Blobel et al.(1979), Aachen-CERN-Bonn-Cracow collaboration. CERN Hydrogen Bubble chamber data for K *(890) K 0 s identification
s ,p) spectra for p+C reaction at 10 GeV/c Study of (K 0 K 0 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/c 2 hyperon from channel ( K 0 s , n) or phase space maximum.
Doubly Strange Systems in P bar +N - + bar : ≈ 2 b; PANDA K @ P bar = 3GeV/c : ≈ max @ P bar = 3GeV/c : below production threshold ) p K N bar +N K bar + K bar +p + … [ - production tag ] Elastic scattering in nucleus: strong slowing down (a challenge) slowing down in matter MeV (with decay) - capture into atomic levels - N and hyperatomic cascade conversion + X ray sticking Capture into nucleus: decay N Strong and Coulomb forces ( MWD,NMWD… ) STRANGENESS IN NUCLEI 9/11/2012 F. Iazzi INFN-Torino&Politecnico
S=-2 H-Dihyperon mass (Predictions)
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