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P. Aslanyan

"The High Statistic Study of Exotic Strange Multibaryon States in Subsystems with  -Hyperons and K 0 s Mesons at  PANDA. P. Aslanyan. 21-25 November, 2011, ITEP, Moscow. Overview. Introduction Study of in-medium effects of hadronic particles

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P. Aslanyan

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  1. "The High Statistic Study of Exotic Strange Multibaryon States in Subsystems with -Hyperons and K0s Mesons at PANDA P. Aslanyan 21-25 November, 2011, ITEP, Moscow

  2. Overview • Introduction • Study of in-medium effects of hadronic particles • Study of baryon spectroscopy with primary and secondary targets • Study of Hyper-nucleus with secondary target • Summary

  3. Introduction • Strange multibaryon states with - hyperon and K0s 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 by proton beams at 10 GeV/c. The observed well-known resonances 0, 0(1385) and K-(892) from PDG are good tests of this method. The according of PANDA(FAIR) program for primary and secondary targets can dividefor the obtained results from PBC on three subjects of research, what are following. • Study of in-medium effects of hadrons. • Study of baryon spectroscopy. • Study of Hyper-nucleus with secondary target . • At present the experimental situation is confused; so is theory. In • the recent paper over viewing the status of the problem A. Gal wrote: “It is clear that • the issue of K0 nuclear states is far yet from being experimentally resolved and • 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. The PANDA detector has a unique possibility for • high statistic and with 4 geometry study above mentioned states with pC and • -C collisions in the most interesting and a poor study energy .

  4. PANDA at FAIR Physics - Hadron Spectroscopy Charmonium Spectroscopy D Meson Spectroscopy Baryon Spectroscopy Physics - Nucleon Structure Generalized Parton Distributions Time-like Form Factor of the Proton Physics - Hadrons in Matter The study of medium modications of hadrons embedded in hadronic matter is aimed at understanding the origin of hadron masses in the context of spontaneous chiral symmetry breaking in QCD and its partial restoration in a hadronic environment. Another study which can be carried out in PANDA is the measurement of J/ψ and D meson production cross sections in p annihilation on a series of nuclear targets. Physics - Hypernuclei However, only 6 double Λ-hypernuclei are presently known, in spite of a considerable experimental effort during the last 10 years. A new chapter of strange nuclear physics will be opened whose first result will be the determination of the ΛΛ strong interaction strength, not feasible with direct scattering experiments.

  5. Study of in-medium effects of hadronic particles: the production of  Hyperons The GEOFIT based on the GRIND-CERN program is used to measure of the kinematic parameters for tracks: total momentum(p), tg( is - depth angle ) and azimuthal angle() from the stereo photographs. There are observed fluctuations (3) by (  ) angles in ranges of -0.70 and -6.8o (preliminary).. There are observed fluctuations by momentum in ranges of 1.56(4), 1.9(3.5) and 2.15(3) GeV/c.

  6. Spherical Coordinates System The azimuthal () angle with geometrical weights for  The azimuthal angle is an angle measured from the x-axis in the xy-plane in spherical coordinates, The scattering () and azimuthal () angles without geometrical weights. The comparison of FRTIIOF and experimental data shown that there are enhancement production for  hyperons in ranges of  < 0 and  0 angles.

  7. The FRTIIOF model and experimental data comparison by the momenta of - shown that there is observed shift of distribution maximum from 200 MeV/c (FRITIOF)to 100 MeV/c for p+C-X reaction.

  8. The  spectrum without weights ofand  ; The  spectrum for 2904 combination with bin size of 12 MeV/c2. The observedwidth of 0is more than 2 times larger by total weight than value of experimental errors. There are also enhancements in mass ranges of 1290-1320 ,1360, 1420 and 1560 MeV/c2 which are can be reflection for enhanement productions from well known hyperons in effective mass spectrum from decay channel 0. After cut of total w< 16 Fig has shown small enhancements in mass ranges of 1300,1385 and 1560 MeV/c2

  9. Study of in-medium effects of hadronic particles: the production of K0s mesons =exp- 1.61 The comparison of FRTIIOF and experimental data shown that there is observed shift maximum for momentum distribution from 400 MeV/c (FRTIOF) to 900 MeV/c.

  10. The comparison of FRTIIOF experimental data shown that there are enhancement production for K0s mesons in ranges of  < 0 and  0 angles. The FRTIIOF model and experimental data comparison by the momenta of - shown that there is observed shift of distribution maximum from 300 MeV/c(FRITIOF) to 100 MeV/c for p+CK0s-X reaction.

  11. Professor Marius UngarishDepartment of Computer ScienceTechnion, Israel Institute of TechnologyHaifa, IsraelE-mail: unga@cs.technion.ac.il Abstract: A gravity current appears when fluid of one density, ρc, propagates into another fluid of a different density, ρα, and the motion is mainly in the horizontal direction. A gravity current is formed when we open the door of a heated house and cold air from outside flows over the floor into the less dense warm air inside. A gravity current is formed when we pour honey on a pancake and we let it spread out on its own. A gravity current which propagates inside a stratified fluid (rather than along a boundary) is called “intrusion.” Gravity currents (intrusions) originate in many natural and industrial circumstances and are present in the atmosphere, lakes and oceans as winds, cold or warm streams or currents, polluted discharges, volcanic ash clouds, etc. The efficient understanding and prediction of this phenomenon is important in numerous industrial, geophysical, and environmental circumstances. Simple qualitative consideration and observations indicate that the gravity current is a very complex, multi-faced, and parameter-rich physical manifestation. Nevertheless, the gravity current also turns out to be a modeling-friendly phenomenon. Indeed, visualizations of the real flow field reveal an extremely complicated three-dimensional motion, with an irregular interface, billows, mixing, and instabilities. The accurate numerical simulation of this flow from the full set of governing equations (the Navier-Stokes system) requires weeks of number-crunching on powerful computer arrays. On the other hand, there are “mathematical models” for the gravity current, whose derivation is based on a long line of assumptions such as hydrostatic pressure, sharp interface, Boussinesq system, thin layer, idealized release conditions. This simplified set of equations enables us to determine the behavior of the averaged variables entirely from analytical considerations and/or numerical solutions that require insignificant CPU time. The lecture gives a brief presentation of some typical models and solutions.

  12. BARYON SPECTROSCOPY: p spectrum with stopped protons The background have done by polynomial, FRITIOF(left Fig.) and the open angles mixing(right Fig.) methods.

  13. p spectrum

  14. 1st International Workshop on Soft Physics in Ultrarelativistic Heavy Ion Collisions (SPHIC06) STAR Au+Au coll. 200 GeV preliminary S Kouznetsov et al, Graal, Trento, 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-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) 1750+-18MeV (K0s)spectrum at 10 GeV beam, JINR 2008/12/15 Sendai08 2008/12/15 Sendai08

  15. Table 1. The observed signalsfrom mass spectra with subsystems

  16. BARYON SPECTROSCOPY: K0sp spectrum with identified protons

  17. Doubly Strange Systems at PandaF. Iazzi – Politecnico di Torino and INFN Sez. Di Torino Physics of Double Strangeness • X- hyper-atoms • X- hypernuclei • LL hypernuclei Production of Doubly Strange Systems Overview • Direct and indirect production with kaons, ions and antiprotons • Two-target technique in PANDA Antiproton beam and internal target • Beam-target interaction • Expected X- rates STRANGENESS IN NUCLEI F. Iazzi INFN-Torino&Politecnico

  18. Production of S=-2 Systems Therefore the experimentaldetermination of Uisdecisively important in order to obtain a reasonable interactionmodel.Here, we briey show the calculation results in three different interaction models; Nijmegen Hard-Core model D (NHC-D) Ehime model Extended Soft-Core model 04d (ESC04d)[20] These models give attractive (negative) value of U.

  19. 9Be(K-,K+) at E906 133 MeV/c 114 MeV/c 104 MeV/c • Twoscenarios:

  20. The missing massspectra for C( p,K0s) The missing massspectra(3428 comb.) for p+ p (-K0s)X reactionwith 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 ev.)

  21. There is not observed signal in missing mass spectra for p+ppK0sX in left Fig.. In right Fig. there are small enhancements(3) for p+cpK0sX with identified protons over Pp<1 GeV/c in mass range of K(500), f0(1020), (1780), M(2050) and M(2580). The dashed histogram is simulation by FRITIOF model.

  22. The missing massspectra(11118comb. for p+3HpK0s X reactionwith 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).

  23. There is not observed signal in missing mass spectra for p(p,+)  (up Fig. ) with 22149 comb.. There is not observed signals. The dashed histogram is simulation by FRITIOF model. There is signal in missing mass range of 42He(3728)(65 events, 3.5) for p(p,) K+.There is not observed signals in missing mass spectra for C(p,K+).

  24. Fig. has shown the missing massspectrum of p(p,)- for 7219events with bin size of 29 and 40 MeV/c2. There is obseved signals in mass range of 2580 MeV/c2 (4.2, 70 events) The missing massspectrum of p+p X reactionwith -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-order2/109=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.

  25. Preliminary results Next step is event by event analysis with KINFIT.

  26. Preliminary 1 F= -3.590759E-02 2 F= 9.027166E-01 3 F= 1.746667E-01 4 F= 3.146067E-01 CHI2 = 1.287799E-01 PROB. = 7.197005E-01, p+12C12B +K0s+p or p+ 6He 6He + K0s+p T899(1) k37 Three prong star with K0s mom. (GeV/c) tg  Beam 9.4871 -.01139 1.68008 K0.66519 -.56858 2.39480 12B(11.356) .010 .12915 4.75202 p 7.98022 .00594 1.64052 ------------------------------------------------- P 1.18799 .25261 1.65367 - .28522 -.04798 1.82060 1 F= -7.255827E-01 2 F= 1.121440 3 F= -5.837970E-01 4 F= 4.333572E-01 CHI2 = 6.758759E-03 PROB. = 9.344784E-01 p+ 3H 6He + K0s+p T912(1)K819 Two prong star with two K0s mom.(GeV/c) tg  Beam 9.423178 -.004545 1.651857 K0 1.750026 -.251970 1.863762 6He(5.78) .00000 .000000 .000000 p 4.115269 -.052577 1.650334 -------------------------------------------------------- Pr. 0.750936 .364844 1.232637 K0 2.161969 .209121 1.740758

  27. S=-2 H-Dihyperon mass (Predictions)

  28.  spectrum from 2m PBC Fig. has shown that there is significant enhancement in mass range of 2370(4.5S.D.) Mev/c2 for  spectrum (201 combination). There are negligble enhancement in mass range of 2250, 2570 and 3100 Mev/c2 too.

  29. S=-2 H0 and H+ dihyperons by weak decay channel s searches

  30. Photography for 3H and dihyperonsidentified by weak decay channel 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 K0s meson at omentum 0.471 GeV/c , with 6.3 cm length. The emitted negative track from the second vertex is identified as - at momentum of 0.353 MeV/c. Fig~a)has shown - C3H+(or -) + K0s, K0-+,3H(or ) 3He(n) + - multi-vertex reaction as candidate for hypernuclear 3H where we can clear see all stages of multivertex event. Fig. has shown the event as candidates for 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/c2which 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

  31. Summary Experimental Challenges with High Statistic in Strangeness Nuclear Physics. The 4 geometry detector and high resolution measurements are necessary. Low energy pions (50-200 MeV/c) and protons(100-200 MeV/c) registration are necessary. The experimental data shown that detector acceptance is necessary to cover of angles  < 0 ( ~ 11 deg.) and  0 for K0sand  production . • Establishment of truly exotic hadrons • dihyperons • K(bar) bound states • YN scattering experiments • X-hypernuclei • Expand the world of hypernuclei • Multi-hypernuclei • We have opportunities! J-PARC, BNL, Jlab, Dafne, LEPS, FAIR, IHEP, JINR. Nature is more rich and beautiful than we can imagine! Thank You!

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