Exotic strange multibaryon states searches with

-hyperon and K0s -meson

systems in p+A collisionsat momentum 10 Gev/c

Contents• Preview• The PBC Method - hyperons and K0

S-mesons production

• (+) spectra• (-) spectra• (p) spectra• (p p) spectra• S=-2 H dibaryon searches• (K0

s ,p) spectra• (K0

s, )spectra• (K0

s ,) spectra• conclusion

P.Zh.Aslanyan .JOINT INSTITUTE FOR NUCLEAR RESEARCH, YEREVAN STATE OF UNIVERSITY .

HS07, Bratislava, 5 September, 2007

There are a few actual problems of nuclear and particle physics which are concerning with this report. These are following goals: in-medium modification of hadrons, the origin of hadron masses, the restoration of chiral symmetry, the confinement of quarks in hadrons, the structure of neutron stars . Multi-quark states, glueballs and hybrids have been searched for experimentally for a very long time, but none is established. Exotic strange multibaryon states has been identified by using 700000 stereo photographs or 106 inelastic experimental events from 2-m propane bubble chamber JINR exposed proton beams at 10 GeV/c. Strange multi-baryonic clusters are an exiting possibility to explore the properties of cold dense baryonic matter and non-perturbative QCD. A survey for new experiments with much improved statistics compared to those early data would hopefully resolve whether such "exotic“ multi-quark hadron and baryon resonances exist. There are not sufficient experimental data concerning strange-hyperons production in hadron -nucleus and nucleus-nucleus collisions over 4-50 GeV/c momenta ranges.

Preview

A reliable identification of the above mentioned resonance needs to use 4-detectors and high precision measurements of the sought objects. The bubble chamber is the most suitable instrument for this purpose . The full experimental information of more than 700000 stereo photographs or 106 events from p+propane inelastic interactions are used to select the events with V0 strange particles . The GEOFIT based on the Grind-CERN program is used to measure the kinematics parameter of tracks momenta(P), tg( - depth angle) and azimuthal angle() in the photographs. The relative error of measuring momentum p and the average track length L of charged particles are found to be P/P=2.1%,< L>=12 cm for stopped particles and P/P>=9.8 %, <L>= 36 cm for nonstopped particles. The mean values of measurement errors for the depth and azimuthal angles are equal to tg = 0.0099 ± 0.0002 and = 0.0052 ± 0.0001 (rad.). The estimation of ionization, the peculiarities of the end track points of the stopped particles(protons, K ) allowed one to identify them. Protons can be identified over the following momentum range: 0.150 P 0.900 GeV/c. In the momentum range P > 0.900 GeV/c protons couldn't be separated from other particles.

Beam

The PBC method

Figures (a,c) and (b,d) show the effective mass distribution of 8657-events with , 4122-events with Ks

0 particles and their 2 from kinematic fits, respectively. The expected functional form for 2 is depicted with the dotted histogram. The measured masses of these events have the following Gaussian distribution parameters MK= 497.7± 3.6, s.d.= 23.9 MeV/c2 and M =1117.0 ± 0.6, s.d.=10.0 MeV/c2. The masses of the observed , Ks

0 are consistent with their PDG values. The experimental inclusve cross sections are equal to 13.3 and 4.6 mb for and Ks

0 production in the p+C collisions at 10 GeV/c.

- hyperons and K0S-mesons production

Proc.International Conference on LOW ENERGY ANTIPROTON PHYSICS ,May 16-22, Bonn - Julich, Germany, 2005; AIP,v. 796, p.195, ISBN 0-7354-0284-1,Melville, NY. hep-ex/ 0504026,2005..P.Z. Aslanian ,The XIth International Conference on Elastic and Diffractive Scattering, May 16-20, Blois, France, 2005. XVIII Baldin ISHEPP, Dubna,September 25-30, 2006. Spin’06, October 2-7, Kyoto, Japan 2006. Internationale Universitдtswochen fur Theoretische Physik,Schladming, Austria, February 26, 2007. "Particles and Nuclei, Letters“,2007.

Figure compares the momentum, cos in the c.m. nucleon-nucleon system, transverse momentum(pt) and longitudinal rapidity distributions of and K0

s for experimental events (solid line) and those simulated by the FRITIOF model (broken line)in p+C interactions. From Fig. one can see that the experiment is satisfactorily described by the FRITIOF model.

/ + - ratio

The experimental data from heavy ion collisions show in figure that the K + / + ratio is larger at BNL-AGS energies than at the highest CERN-SPS energies and even at RHIC. This behavior is of particular interest as it could signal the appearance of new dynamics for strangeness production in high energy collisions.If the hadronic rescattering mechanism dominates strangeness enhancement at 10 A GeV, how rapidly does this reduce as the beam energy is increased . Strangeness enhancement has been extensively discussed as a possible signature for the quark-gluon plasma (QGP) [1,2]. Strange particle production has also been analyzed regarding such reaction mechanisms as the multinucleon effect [3], the fireball effect [4], or as the deconfiment signal, within the context of thermal equilibrium of hadron statistical model [5,6,7,8]. The statistical approach has been very successful in describing particle yields from low energies starting with SIS and AGS all the way up to SPS (see figure). In particular, strange particles have been observed extensively on hadron - nucleus and nucleus-nucleus collisions 4-15 Gev regions [9-14]. Experiments on Si+Au and Au+Au collisions at 11.6 and 14.6 A GeV/c(AGS) a K + / + ratio in heavy-ion reactions was measured which is four to five times larger than the K + / + ratio in p+p reactions at the same energy[13,14].

The number of -s produced in antiproton +Ta reaction at 4 GeV/c was 11.3 times larger than that expected from the geometrical cross section (KEK, Japan) [9].The strange hyperon yields [6 ,9, 10, 11] are therefore of great interest as an indicator of strange-quark production(see in figure). Figure shows the energy dependence of the /+, - / + and the - / +. As can be seen from the figure there is a very clearly pronounced maximum especially in the / + ratio. However, there have not been sufficient experimental data concerning strange-hyperon production over 4-50 GeV/c momentum range in nucleus-nucleus collissions. The multiplicity of and + production in C+C reaction at 10 GeV/c have been used the Glauber approach based on the experimental cross section for p+C X from this experiment [14]. / + ratios in p+C interactions are equal to 5.3*10-2 and 2.6 * 10-2 at beam momentum 10 GeV/c and 4.2 GeV/c, respecctively . This experiment is shown that there is not a significant enhancement of the cross section for pCK0

s X. Therefore the enhancement of production is obtained from pCK+X reaction that it is means the enhancement of K+ production too. The /+ ratio from this experiment in pC reaction is approximately two times larger than ratios at the same energies for pp reaction and for same reaction, which was simulated by FRITIOF model.

[1]J.Rafaelski et al., PL. 91B,281,1980; PRL 48, 066,1982.[2] P.Koch et. al., PL 123B,151.1983.[3] J.Rundrup and C.M.Ko, Nucl.Phys. A343, 519, 1980.[4] F.Asai, H.Sato and M.Sano, Phys. Lett. 98B, 19, 1981.[5] J. Cleymans and K.Redlich, Phys.Rev. C60(1999).[6] P. Braun-Munzinger et al.,NPA697:902-912,2002;hep-ph/0106066,2001.[7] F. Becattini et al, PR C24,024901,2001.[8] M. Gazdzicki, hep-ph/0305176v2,2003.

Figure : Prediction of the statistical-thermal model[5,6] for /+ note the factor 5, solid line ), and -/+ (dashed line) and / + ratios a function of s. For compilation of AGS data see [7]. The / + ratio in interaction C+C was obtained by using data from this experiment for pC X .

[9] K. Miyano et al., Phys. Rev. C38 (1988).[10] M. Anikina et al., Phys. Rev. Lett. 50 (1971).[11] S. Albergo,et. al.,Phys. Rev. Lett. 88,v.6, 2002.[12] B. Back et al.,E866, E917 Collab., nucl-ex/9910008[13]J. C. Dunlop and C. A. Ogilvie, Phys. REV. C, VOLUME 61,031901(R),2000;[14] P.Z. Aslanian et. al., JINR comm., E1-2005-149, 2005."Particles and Nuclei, Letters".

(+ ) spectra

Test method with known resonance. The resonance with similar decay properties *(1382)

registered. Decay width is equal to 40 MeV/c2. M/M0.7 % in range of *(1382) invariant mass. Masses and widths consistent with PDG values. The cross section of *(1385) production (540 simulated events) can estimated by FRITIOF model which is equal to 1.0 mb (540 simulated events) at 10 GeV/c for p+C interaction.

Preliminary new results for (- ) spectra

The - effective mass distribution for all 4940 combinations with scales 18 and 12 MeV/c2. The solid curve(Fig.a) is the sum of the background (by the first method ) and 1 Breit-Wigner resonance. There is significant enhancement In the mass range 1372 MeV/c2 with S.D.= 11.3, =93 MeV/c2. The cross section of *-

(1385) production (680 events) is equal to 1.3 mb at 10 GeV/c for p+C interaction.Broadening of width for -(1385) 2 times larger the than PDG value have observed. Figure (b) shows effective mass distribution with scale of 12 MeV/c2, where there are also significant enhancements in mass regions of 1345(3.0 S.D.) and 1480(3.2). There are negligible l enhancements in mass regions of 1410, 1520 and 1600 MeV/c2.

The cross section of - production (60 events) stopped in nuclear medium is equal to 15 b at 10 GeV/c for p+propane interaction. Expected number events with - is equal 8 events(w=1/e =5.3). We observed that

the experimental production of - 7-8 times larger than the number of events with - similarly simulated by fritiof

model. Figures shows that *-(1480) resonance observed too which is agreed with SVD result.

Preliminary new results for (- ) spectra

(p) spectra

• The first evidence for Quantum Chromodynamics (QCD), the theory of the strong interactions, came from the systematics of baryon and meson spectroscopy. Already back in 1977 Jaffe, using the bag model in which confined colored quarks and gluons interact as in perturbative QCD, suggested the existence of a light nonet composed of four quarks mesons, five quark baryons, six quarks dibaryons et.al..

• A phenomenological model is proposed for the analysis of the properties of the Kaonic Nuclear Cluster (KNC) K−pp in its ground state. For the first time the KNC 2

KH has been investigated by Akaishi and Yamazaki within the PotentialModel (PM) approach.

Very recently, possible existence of discrete nuclear bound states of Kp has been predicted based on the experimental information on the KN scattering lengths, kaonic hydrogen atom and the (1405) resonance. In this model the pp pair inside the KNC 2

KH is in the 1S0 state and the K−p pairs are in the S –wave states. Thus, the p pair, produced in the reaction K−(pp)1S0 → p, is in the 3P0 state.

Preview

The problem of experimental examination of multibaryon strange resonances was started at JINR, LHE from 1962 up to now. The effective mass spectra of 17 strange multiquark systems were studied for neutron exposure nC X at average momentum 7.0 GeV/c, and this group succeeded in finding resonance-like peaks [1-3] only in five of them

pp , pp , , p, . These data obtained with very small statistic and has been improved by using data

from p+ propane interaction. Results[4] in pC collision at 10 GeV/c show that the obtained peaks in reports [1-3] has been confirmed.

1) B.A. Shahbazian et al., Nucl. Physics, A374(1982),p. 73c-93.c.2) B.A. Shahbazian ,JINR Commun., E1-82-446,1982, International Conference on Hypernuclear and Kaon Physics, Heidelberg, 1982.3) B.A. Shakhbazian et al., (Dubna, JINR). JINR-D1-81-107, 1981. 4.

Most significant evidence for p p spectrum with mass of 2223 and 2263 MeV/c2 was included in the Review of Particle Properties( Phys.Lett.170B(1986)).

( ,p),p) spectra from neutron exposure on PBC

(,p) spectra in p+propane collision at 10 GeV/c

The total experimental background has been obtained by three methods. In the first method, the experimental effective mass distribution was approximated by the polynomial function after cutting out the resonance ranges because this procedure has to provide the fit with 2=1 and polynomial coefficient with errors less than 10 %. The second of the randomly mixing method of the angle between proton and for experimental events is described in JINR Rapid Comm., N6(74),p209, 1995. Then, these background events were analyzed by using the same experimental condition and the effective mass distribution was fitted by the polynomial function. The analysis done by two methods has shown that while fitting these distributions had the same coefficients( with 30 % errors) and order of polynomial.The third background method has been obtained by using FRITIOF modelwith experimental canditions (FRITIOF, H. Pi, Comput. Phys.Commun. 71,173, 1992). The values for the mean position of the peak and the width obtained by using Breit Wigner fits . The statistical significance for the fit on Fig. inside a mass window is calculated as NP /(NB)1/2, where NB is the number of counts in the background fit under the peak and NP is the number of counts in the peak.

P.Z. Aslanyan et al., Proc. “I.Y. POMERANCHUK AND PHYSICS AT THE TURN OF CENTURIES Moscow, January 24–28, 2003.Proc.International Conference on LOW ENERGY ANTIPROTON PHYSICS ,May 16-22, Bonn - Julich, Germany, 2005; AIP,v. 796, p.195, ISBN 0-7354-0284-1,Melville, NY. hep-ex/ 0504026,2005..P.Z. Aslanian ,The XIth International Conference on Elastic and Diffractive Scattering, May 16-20, Blois, France, 2005. XVIII Baldin ISHEPP, Dubna,September 25-30, 2006. Spin’06, October 2-7, Kyoto, Japan 2006. Internationale Universitдtswochen fur Theoretische Physik,Schladming, Austria, February 26, 2007

The p effective mass distribution for 2434 combinations for identified protons with a momentum of 0.300 P 0.900 GeV/c and np=1,2 is shown in Figure. The solid curve is the sum of the background by the first method and 4 Breit-Wigner resonances . There are significant enhancements in mass regions of 2100, 2180, 2280 and 2353 MeV/c2 (Table,Fig.). Their excess above background by the second method is 6.9, 4.9, 3.8 and 2.9 S.D., respectively. There is small peak in the mass region of 2225 MeV/c2. These peaks are agreed with experimental data from PBC in neutron exposure. The peaks are agreed with experimental data from FOPI,FINUDA and OBELIX collaboration which was recently obtained.

.

MM, MeV/c2 , MeV/c2 S.D.S.D. 2100 14. 6.9 2180 5. 4.9 2225 - 3.1 2280 16. 3.8 2363 - 2.9

Preliminary new result for (,p) spectrum with stopped protons

The p effective mass distribution for 2025 combinations with relativistic protons over a momentum of P >1.65 GeV/c is shown in Figure. The solid curve is the 6-order polynomial function( 2/n.d.f=205/73). Backgrounds for analysis of the experimental data are based on FRITIOF and the polynomial method. There are significant enhancements in mass regions of 2155(2.6 S.D.), 2225(4.7 S.D., with =23 MeV/c2), 2280(4.2 S.D.), 2363(3.6 S.D.) and 2650MeV/c2(3.7 S.D.). These peaks with protons in relativistic momentum range and with identified protons in a momentum of 0.300 P 0.900 GeV/c are agreed

(,p) spectra with relativistic protons

Talk from FOPI, by N. Hermann, on BARYON07, Seul.

Aslanyan et al. DUBNA

Propane bubble chamber

p+p, p+12C, n+p, n+12C

• Invariant mass

K-pp --> + p

a significant peak(6 S.D.)

at M ~ 2220 MeV/c2

BK ~ 120 MeV

CF2007, Dubna, June-19-2007 Toshimitsu Yamazaki RIKEN

proton data

neutron data

(,p,p) spectrum in p+propane collision at 10 GeV/cXVIII Baldin ISHEPP, Dubna,September 25-30, 2006. Spin’06, October 2-7, Kyoto, Japan 2006

Recentry, E471 experiment have discovered two kinds of strange tribaryons by measuring nucleon energy spectra from the stopped K− reaction on 4He [1] (KEK PS), which was motivated by the prediction of a deeply bound K−ppn state by Akaishi and Yamazaki [2]. The first kind, S0(3115), was discovered in(K− − 4He)atomic S0(3115) + p (1)reaction [3]. The observed state has isospin T = 1, charge Z = 0 and mass MS0 = 3118 MeV/c2. The second kind, S+(3140), was indicated from(K− − 4He)atomic S+(3140) + n (2)reaction [4] originally proposed to search for the K−ppn state, which was predicted to be at M = 3194 MeV/c2 with T = 0 and Z = 1 [2].

Talk from FOPI by N. Hermann, on BARYON07, Seul.

The pp effective mass distribution for 3401 combinations for identified protons with a momentum of P <0.9 GeV/c is shown in Figure. The solid curve is the 6-order polynomial function( 2/n.d.f=245/58, Fig.a ). The backgrounds for analysis of the experimental data are based on FRITIOF and the polynomial method.There is significant enhancements in mass regions of 3138(6.1 S.D.). There are small enhancements in mass

regions of 3087(2.2 S.D.), 3199(3.3 S.D.), and 3320(4.1 S.D), 3440(3.9 S.D) and 3652MeV/c2(2.6 S.D.). These peaks in ranges of 3138 and 3199MeV/c2 were agreed with registered peaks: from reports[3-4] of E471 experiment, PS,KEK, from experiments FOPI and OBELIX.1. M. Iwasaki et al., Nucl. Instrum. Meth. A 473 (2001) 286.2. Y. Akaishi and T. Yamazaki, Phys. Rev. C 65 (2002) 044005.3. T. Suzuki et al., Phys. Lett. B 597 (2004) 263.4. M. Iwasaki et al., nucl-ex/0310018, submitted to Phys. Lett. B.

Present Status of Experimental Investigation ofDeeply Bound Kaonic States T. Yamazaki and Y. AkaishiECT*, Trento, June 22, 2006

S=-2 H dibaryon searches

The H-dibaryon is a spin and isospin singlet, the spin- flavor symmetric and positive parity state composed of six quarks (uuddss). The H-dibaryon may exist in another environment e.g. in a double hypernucleus or in some special astrophysical objects. There have been reported a few events for H dibaryons and double hypernuclei in BNL,KEK,JINR, CERN, FNAL et al.( the Table from Ts. Sakai et.al.,Osaka U.,nucl-th/9912063, Dec. 1999. ). Many projects for double hypernucleus hunting are going on...

The weak decay channels searches for stable S=-2 dibaryon states is being continued to date. A few events, detected on the photographs of the propane bubble chamber exposed to a 10 GeV/c proton beam, were interpreted as light and heavy H dibaryons which are presented in Table.

H dibaryon states in p+propane collision at 10 GeV/c

P.Z. Aslanyan, JINR Commun.,E-2001-265,2002 . Nuclear Physics B 5B(1999) 63-65

New observation of heavy S=-2, positive H+ dibaryons from weak decay channel of H+(2482)K-pp on PBC XVIII Baldin ISHEPP, Dubna,September 25-30, 2006. Spin’06, October 2-7, Kyoto, Japan 2006.

The positive secondary track is produced from the beam range. The appearance of its first part, 15.8 cm long, with a momentum of pH+ =1.2 0.12GeV/c and average relative ionizationmore than I/I0>2 . Thisionization allows one to select only two H+ or deuteron hypotheses which can imitate this track. The second part is due to two stopped protons. The negative K- momentum is equal to 0.560.03 eV/c(I/I0 1.5 ) .

The kinematic threshold does not permit (s=1.96 GeV/c) imitating the reaction with deuteron including fermi motion. The H+ K-pp hypothesis fits the event with 2(1V-3C)=2.6, C.L.= 28 %, and MH+

=248248 MeV/c2. There is also fits by hypothesis with channel H+ -+p which have much less probability than above hypothesis..

H+ p

K-

p

((KK ss00p)- p)- sspectrapectra

[1] D. Diakonov, V. Petrov, and M. Polyakov, Z. Phys. A 359 (1997) 305. [2] V.Guzey and M.Polyakov, arXiv hep-ph/0501010,2005. Θ(1540)+ was included in the Review of Particle Properties.Citation: W.-M. Yao et al. (Particle Data Group), J. Phys. G 33, 1 (2006) (URL: http://pdg.lbl.gov)

•Exotic: S= +1Exotic: S= +1Results from a wide range of recent experiments are consistent the +(1540) with a narrow width and a mass near 1540 MeV [1]. Narrow width: < 15 MeVNarrow width: < 15 MeV

Results from this experimentResults from this experiment(cited 100):(cited 100):M M + = (1540 = (15408) 8) MeV/c2, + =(9.2 1.8) 1.8) MeV/c2.PDG-04: + =(9.2 0.3)0.3) MeV/c2.Meson （ q q ）

Baryon （ q q q ）

ICHEP’06, Moscow, 29.07.2006

• SVD observes in two independent samples a signal in pK0s with

M=(15232 3) MeV/c2, <14 MeV/c2, Sign. 8, *BR(K0p) 6 b for Xf>0.

• Xf peaks at zero with <|Xf|> 0.1 (agrees qualitatively to Regge-based model).

• Agrees to ZEUS, HERMES, ToF results.

• No direct contradiction to null results of WA89, HyperCP, HERA-B, SPHINX (mainly due to different acceptances at Xf 0).

•(1480) resonance observed in small Xf region

• Higher statistics is needed. SVD expects to collect 10 times more in 2007.

Study of narrow baryon resonance decaying into pKpK00ss

in p-A interactions at 70 GeV/c with SVD-2A.Kubarovsky, A.Kubarovsky, V.PopovV.Popov, V.Volkov (SINP MSU), V.Volkov (SINP MSU)

from SVD Collaboration (SINP MSU,IHEP(Protvino),JINR (Dubna) )from SVD Collaboration (SINP MSU,IHEP(Protvino),JINR (Dubna) )

Ks0p - spectrum, PBC data at 10 GeV/c

The Ks0p effective mass distribution for identified

protons with a momentum of 0.350 P 0.900 GeV/c is shown in Figure. The solid curve is the sum of the background and 4 Breit-Wigner resonance curvesThe cross section is equal to 90 b for p+propane reaction.

The Ks0p invariant mass distribution with a momentum Pp 1.7 GeV/c (3500 combinations) is shown in Figure. The histogram is approximated by a polynomial background curve and by 5 resonance curves taken in the Breit-Wigner form. The dashed curve is the background taken in the form of a superposition of Legendre polynomials up to the 6 -th degree, inclusive.

P.Aslanyan et al., JINR, P.Aslanyan et al., JINR, E1-2004-137,2004E1-2004-137,2004; Nuclear Physics A 755, 375, (2005).

(( KK 00ss ) ) --spectraspectra

P.Z. Aslanyan et al., Proc.International Conference on LOW ENERGY ANTIPROTON PHYSICS ,May16-22, Bonn - Julich, Germany, 2005; AIP,v. 796,ISBN 0-7354-0284-1. JINR comm., E1-2005-149, 2005. "Particles and Nuclei, Letters“,2006.

The Ks0 effective mass distribution for 1012 combinations is shown in Figure. The solid curve is

the sum of the background by the first method and Breit-Wigner resonances . Similar results have obtained when using a Breit Wigner distribution and diferent bin sizes. There are significant enhancements in mass regions of 1750 and 1795 MeV/c2 (Fig.). There are small peaks in the mass regions of (1650- 1700),(1830-1860) and (1925 -1950) MeV/c2 . The cross section is equal to 30 b for p+propane reaction.

Ks0 - spectra analysis, at 10 GeV/c on PBC

These peaks are possible candidates for two pentaquark states: the N0 with quark content udsds decaying into K0 and the 0 quark content udssd decaying into ( K0 ), which are agreed: with the calculated rotational spectra N0 and 0 spectra from the theoretical report of D. Akers, arXiv.org:hep-ex/0310014, 2004 (below figure) and with + spectra from the experimental report of P. Aslanyan JINR, E1-2004-137,2004 .

The scalar mesons have vacuum quantum numbers and are crucial for a full understanding of the symmetry breakingmechanisms in QCD, and presumably also for confinement. Suggestions that the (600) and (800) could beglueballs have been made. There are theoretical arguments for why a light and broad (800)(qq or 4-quark state) pole can exist near the K threshold and many phenomenological papers support its existence . The (600) and (800) indeed belong to the same family as the f0(980) and a0(980) mesons (say if the (600) were composed of 2 or 4 u and d type quarks) then no such mechanism would suppress the decay 0(600)+- or (800) K. The PDG numerous determinations of the pole mass in the neighborhood of 600 MeV. There is believe that experimental groups should look for pole positions in their data analysis, which also include the aforementioned nonlinear effects from S-wave thresholds. The E791 Collaboration reported a light with mass 797 MeV and width 410 MeV, but uses a Breit–Wigner amplitude . This claim was, however, not confirmed by the CLEO Collaboration. A lighter and very broad pole is nonetheless possible and should be looked for in future data analyzes.

“

(K0s ,) spectraTalks: XVIII Baldin ISHEPP, Dubna, September 25-30, 2006. Spin’06, October 2-7, Kyoto, Japan2006.

Particles and Nuclei, Letters” [114],2002 .The effective mass distribution of +- -combinations from the total statistics of the reaction np +- at Pn = 5.20 GeV c .The dotted curve is the background taken in the form of a superposition of Legendre

polynomials up to the 10-th degree, inclusive. The effective mass distribution of +- –combinations from total statistics of the reaction np +- at Pn=5.2 GeV/c(JINR HPC). The distribution is approximated by a polynomial background curve and by 3 resonance curves taken in the Breit-Wigner form Fig.. At least 3 states with quantum numbers of 0 –meson 0+(0{++}) have been found at masses of 418, 511 and 757 MeV/c2. The fact low -mass 0-mesons are glueballs is one of the possible interpretations.

Bockmann et al.,Nuclear Physics ,V. B166(1980), No.2. The present data come from exposure of the CERN 2 m hydrogen bubble chamber to + and p beams. The

investigation is based on totals of apporximately 330000 + p events at 16 GeV/c and 280000(400000) for pp events at 12(24) GeV/c. Effective mass distribution for K0

s+ and K0s- in pp interactions at 12 , 24 GeV/c and -p

interactions at 16 GeV/c. The curves represent the fits with the background dashed below K*(892) signals.There are negligible peaks in mass ranges of 720 and 800 Mev/c2.

The effective mass distribution of K0s+ -combinations from the total statistics of the

reaction pA .The solid curve is the background taken in the form of a polynomials up to the 8-th degree. The dashed histogram is the background by FRTIOF. The invariant mass has significant enhancement in range of 890 Mev/c2(from PDG). There are peaks in mass ranges of 720(4.6), 800(4.2) and 1060(7.3) Mev/c2.

The solid curveis the sum of 2BW and background (black) taken in the form of a superposition of polynomial up to the 6-th degree. The dashed curve(red) is the background by polynomial without mass range of 0.75< MK <0.98 MeV/c2 when a 1BW function was used.

The effective mass distribution of K0s- -combinations from the total statistics of the reaction pA at Pp = 10

GeV/ c .The solid curve is the background taken in the form of a superposition of polynomials up to the 6-th degree, inclusive. The dashed histogram is the background by FRTIOF. The invariant mass has significant enhancement in range of 890 Mev/c2(K*(892) PDG). There are peaks in mass ranges of 730 and 780 Mev/c2. in Figure(a) the effective mass distribution presented with large scale (33 MeV/c2). In this case there are significant enhancements in mass ranges of 730 and 890 MeV/c2.

K0s- - spectra

The solid curveis the sum of 2BW and background (black) taken in the form of a superposition polynomial up to the 6-th degree. The dashed curve (red) is the background by polynomial without mass range of 0.75< M K <0.96 MeV/c2 when was used 1BW function.

Resonance

decay modeMK MeV/c2 Experimental

Width (e)

MeV/c2

MeV/c2

The

statistical significance

K0s

890 70 52 6.0-8.2K0

s

780 30 12 2.5- 4.2

K0s

720 55-145 35-125 4.1-15.2

Conclusion

•The experimental The experimental / ++ ratio ratio in the pC reaction is approximately two times larger in the pC reaction is approximately two times larger than this ratio from pp reactions or from simulated pC reactions by FRITIOF than this ratio from pp reactions or from simulated pC reactions by FRITIOF model at momentum 10 GeV/c. model at momentum 10 GeV/c. •The invariant mass of + + and K0

s spectra has observed well known resonances *+(1385) and K*+( 890) ( from PDG). Test method.•The width of exited width of exited *-(1385) is two time wo time larger Iarger In medium than PDG data than PDG data (preliminary result).(preliminary result).• Experimental production of stopped - have obseved which have 7-8 times larger cross sectioncross section than expected for p+propane interaction xpected for p+propane interaction (preliminary result).(preliminary result).*-(1480) resonance observed which is agreed with SVD result.•A few events were registeredA few events were registered by hypothesis of light Hby hypothesis of light H00 and heavy H and heavy H 0,+0,+ dibaryons dibaryons by weak decay channels to (by weak decay channels to (--,p), ( ,p), ( , p, , p, 00), (), (++pp--), (K), (K-,p, p).,p, p).•A number of important peculiarities were observedA number of important peculiarities were observed in pA in pA (K(K00

SS ) X ) X reactions reactions in the effective mass spectra for exotic states with decay he effective mass spectra for exotic states with decay modes: modes: 1) 1) ( ( , , ),), ( ( ,p), ( ,p), ( , p, p), p, p) ; 2) (K; 2) (K00

ss,p), (K,p), (K00SS, , ), (K), (K0

SS, , ). ). Peaks for ( for ( ,p) spectrum,p) spectrum are agreed with experimental data from the recently reports of FOPI, OBELIX, FINUDA collaborations. New obtained New obtained statistical significance for mass statistical significance for mass M(2220)M(2220)p is equal to 6 S.Dp is equal to 6 S.D.. ..

Bratislava, September 5, 2007

Peaks for ( for ( pp)pp) in mass ranges of 3138(6.1 S.D.) and 3199(3.3 S.D.) MeV/c2 spectrumspectrum were agreed with registered peaks from reports of KEK,FOPI and OBELIX.The experimental result from Dubna for (p) correlation have got the very high estimation from authors T. Yamazaki, K.Imai ,Y. Akaishi and N.Herman(FOPI)•Structures seen in Λpp und Λp final states in different reactions conflicting peak positions or widths?•The experimental results for +(1540)((1540)(cited 102 times) spectrum with exited states have got the very high estimation in reports from authors P. Palazzi, A Arkhipov, D. Akers and A.Airapetian(HERA) . •The peaks (1750±18) and (1795±20) MeV/c2 are possible candidates for two pentaquark states: the N0 with quark content udsds decaying into K0 and the *0 with quark content udssd decaying into K0(bar).•Significant enhancements for KSignificant enhancements for K00

ss spectraspectra are observed with mass of 720 S.D. are observed with mass of 720 S.D.

((4.1-15.2 S.D) , 780 MeV/c , 780 MeV/c22 (2.5 - 4.2 S.D.) and width (2.5 - 4.2 S.D.) and width (35-125) MeV/c(35-125) MeV/c22 , , 12 12 MeV/cMeV/c22 respectively respectively. K*K*++(1060) exited state with 7.2 S.D. observed only by channel (1060) exited state with 7.2 S.D. observed only by channel of Kof K00

ss+.+.

Bratislava, September 5, 2007

•The intriguing results of the observation on propane bubble chamber has induced the interest to continue these searches for exotic strange multiquark states with and K0s sysems at FAIR (GSI), JPARC(KEK),NICA(JINR), Frascati,CLOE and JLAB, which can get a valuable information about their nature, properties and it will be a test for observed data on PBC. Higher statistics and interaction with different nucleas is needed. •Much of the quark (u, d, s) spectroscopy data are from the 1960’s and 1970’s, and the patterns of the observed resonances have been well studied. However, with the expected significant improvement in the knowledge of the hadron spectra, additional symmetries may become evident. These could point to new effective degrees of freedom. For example, i is the quark-diquark or three quark picture for baryons more appropriate? What degrees of freedom are suggested by the spectra of hybrids, glueballs, and/or exotic states?

Bratislava, September 5, 2007

Thank you very much!