Strangelet search in S-W collisions at 200<i>A</i>GeV/<i>c</i>

Borer, K.; Dittus, F.; Frei, D.; Hugentobler, E.; Klingenberg, R.; Moser, U.; Pretzl, K.; Schacher, J.; Stoffel, F.; Volken, W.; Elsener, K.; Lohmann, K D; Baglin, C.; Bussiére, A.; Guillaud, J.P.; Appelquist, G.; Böhm, C.; Hovander, B.; Selldén, B.; Zhang, Q.P.

doi:10.1103/physrevlett.72.1415

Cited by 41 publications

(18 citation statements)

References 7 publications

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“…The accumulated statistics and beam line acceptance allow one to set a limit on the invariant differential production cross section for strangelets in the order of 50 nb GeV 22 c 3 . A similar sensitivity has been obtained previously in S-W collisions at 200 GeV͞c per nucleon [19] by this group. It is planned to continue data taking in the forthcoming lead periods at CERN to further improve the experimental sensitivity.…”

supporting

confidence: 67%

“…Strangelets with lifetimes .10 27 s have been previously searched for in BNL [14][15][16][17][18] and CERN [19] heavy ion experiments as well as in cosmic rays [20]. A recent review is given in Ref.…”

mentioning

confidence: 99%

“…The fraction f͑m͒ can then be calculated by integrating d 2 N͞dy dp Ќ over the acceptance in y and p Ќ of the spectrometer [19]. The absolute values of the sensitivity strongly depend on the assumed model parameters, in particular, on the mean transverse momentum ͗p Ќ ͘ of the strangelets which is unknown.…”

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confidence: 99%

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Strangelet Search in Pb-Pb Interactions at 158 GeV/cper Nucleon

et al. 1996

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The NA52 experiment searches for long-lived massive strange quark matter particles, so-called strangelets, produced in Pb-Pb collisions at a beam momentum of p lab 158 A GeV͞c. Upper limits for the production of strangelets at zero degree production angle covering a mass to charge ratio up to 120 GeV͞c 2 and lifetimes t lab * 1.2 ms are given. The data presented here were taken during the 1994 lead beam running period at CERN. [S0031-9007(96) PACS numbers: 25.75. Dw, 12.38.Mh, 24.85.+p The production of strange quark matter (SQM), socalled strangelets, has long been advertised as an ultimate signature for quark-gluon plasma (QGP) formation in ultrarelativistic heavy ion collisions. Strangelets could be formed from the QGP via a strangeness distillation process [1][2][3][4]. Their production is due to a cooling process of the plasma which results in a strong enhancement of the s quarks in the quark phase. The cooling mechanism of the plasma is started by the evaporation of pions, K 1 and K 0 , which carry entropy and antistrangeness away from the system. The strong s-quark enhancement in the baryon rich environment of the plasma favors the formation of strangelets. In contrast to nuclear matter, strangelets consist of approximately the same number of u, d, and s quarks. On the basis of the Pauli exclusion principle such multiquark states become stable owing to the introduction of strangeness as an additional degree of freedom. Depending on the relative s-quark content, strangelets can exist in neutral or charged form. By virtue of the large s-quark content, the charge to mass ratio of strangelets is expected to be small ͑Z͞A , 0.1͒, which is used as a prominent experimental signature. Bag model calculations indicate that for sufficiently large masses ͑A . 10 GeV͞c 2 ͒ strangelets could be stable with respect to strong and weak nucleon emission and therefore detectable in mass spectrometer experiments [5][6][7][8]. Strangelet formation has also been considered in coalescence models [9]. Strange quark matter could even occur as a decay product of metastable exotic multihypernuclear objects (MEMO's) [10]. The discovery of strangelets would have profound implications beyond the confirmation of the QGP formation: it would establish the existence of strange quark matter (SQM) [11][12][13] [20]. A recent review is given in Ref. [21]. During the 1994 Pb period at CERN, the NA52 Collaboration took data to search for positively and negatively charged strangelets resulting from lead-on-lead collisions at an incident beam momentum of 158A GeV͞c. Preliminary results have been already presented [22]. Now the full statistics have been analyzed and the final results are reported here.The experimental setup (Fig. 1) makes use of the existing H6 beam line at the CERN-SPS to identify the secondary particles produced in the lead target. It is a single particle, double-bend focusing spectrometer transmitting charged particles within a momentum bite of 2.8% for rigidities p͞jZj selectable between 5 and 200 GeV͞c with full particle...

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confidence: 67%

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confidence: 99%

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Strangelet Search in Pb-Pb Interactions at 158 GeV/cper Nucleon

et al. 1996

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“…These developments triggered several investigations concerning the properties of the multi-Skyrmions (such as e.g., vibrational excitations [8]) as well as their application to baryonic systems containing strangeness [9,10] and heavier flavors [11]. The extension to flavored multibaryons is also motivated by the advent of heavy ion colliders with the possibility of producing strange [12] and even charmed [13] multibaryonic states with rather low baryon number in the laboratory. To describe the strange multibaryons one has to extend the model to SU(3) flavor space.…”

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confidence: 99%

Multibaryons in the collective coordinate approach to the SU(3) Skyrme model

Schat

Scoccola

2000

Phys. Rev. D

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We obtain the rotational spectrum of strange multibaryon states by performing the SU(3) collective coordinate quantization of the static multi-Skyrmions. These background configurations are given in terms of rational maps, which are very good approximations and share the same symmetries as the exact solutions. Thus, the allowed quantum numbers in the spectra and the structure of the collective Hamiltonians we obtain are also valid in the exact case. We find that the predicted spectra are in overall agreement with those corresponding to the alternative bound state soliton model.

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“…New and more sensitive searches for the H-particle (neutral, doublystrange dibaryon) and strangelets have begun at the AGS [270] and SPS [269,271]. These experiments seek to provide the first spectacular observations of such particles or at a minimum to set stringent limits on their production cross sections.…”

Section: Other Probesmentioning

confidence: 99%

The Search for the Quark-Gluon Plasma

Harris

Müller

1996

Annu. Rev. Nucl. Part. Sci.

332

308

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We provide an overview of the present understanding of the transition from hadrons to a quark-gluon plasma, its signatures, and the experimental results so far. We discuss results of numerical simulations of the lattice gauge theory and critically evaluate the various observables that have been proposed as signatures of the QCD phase transition. We place the existing data from relativistic heavy ion experiments at the Brookhaven AGS and CERN SPS into perspective and provide an overview of the techniques and strategies that will be employed in the search for the quark-gluon plasma at heavy ion colliders, such as RHIC and the LHC.

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Strangelet search in S-W collisions at 200AGeV/c

Abstract: A search for new massive particles vnth a lour charge to mass ratio in S -W collisions at a beam momentum of 200 GeV/c per nucleon is presented. Upper limits for the production of strangelets with a mass to charge ratio of up to 60GeV/c at rigidities of +150GV are reported.

Cited by 41 publications

References 7 publications

Strangelet Search in Pb-Pb Interactions at 158 GeV/cper Nucleon

Strangelet Search in Pb-Pb Interactions at 158 GeV/cper Nucleon

Multibaryons in the collective coordinate approach to the SU(3) Skyrme model

The Search for the Quark-Gluon Plasma

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