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AbstractAbstract
[en] Scientists from the LHCb experiment at the large hadron collider (LHC) in CERN have announced the discovery of a new particle named Ξcc++. This particle being made up of 3 quarks is a baryon but it is the first baryon ever discovered containing 2 charmed quarks. Its mass equals 3261 MeV which is almost 4 times the proton mass. (A.C.)
Original Title
Une charmante decouverte au CERN
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Journal Article
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Link, J.M.; Reyes, M.; Yager, P.M.; Anjos, J.C.; Bediaga, I.; Goebel, C.; Magnin, J.; Massafferri, A.; Miranda, J.M. de; Pepe, I.M.; Reis, A.C. dos; Carrillo, S.; Casimiro, E.; Cuautle, E.; Sanchez-Hernandez, A.; Uribe, C.; Vazquez, F.; Cinquini, L.; Cumalat, J.P.; O'Reilly, B.; Ramirez, J.E.; Vaandering, E.W.; Butler, J.N.; Cheung, H.W.K.; Gaines, I.; Garbincius, P.H.; Garren, L.A.; Gottschalk, E.; Kasper, P.H.; Kreymer, A.E.; Kutschke, R.; Bianco, S.; Fabbri, F.L.; Sarwar, S.; Zallo, A.; Cawlfield, C.; Kim, D.Y.; Rahimi, A.; Wiss, J.; Gardner, R.; Kryemadhi, A.; Chung, Y.S.; Kang, J.S.; Ko, B.R.; Kwak, J.W.; Lee, K.B.; Park, H.; Alimonti, G.; Boschini, M.; D'Angelo, P.; DiCorato, M.; Dini, P.; Giammarchi, M.; Inzani, P.; Leveraro, F.; Malvezzi, S.; Menasce, D.; Mezzadri, M.; Milazzo, L.; Moroni, L.; Pedrini, D.; Pontoglio, C.; Prelz, F.; Rovere, M.; Sala, S.; Davenport III, T.F.; Agostino, L.; Arena, V.; Boca, G.; Bonomi, G.; Gianini, G.; Liguori, G.; Merlo, M.M.; Pantea, D.; Ratti, S.P.; Riccardi, C.; Segoni, I.; Vitulo, P.; Hernandez, H.; Lopez, A.M.; Mendez, H.; Mendez, L.; Montiel, E.; Olaya, D.; Paris, A.; Quinones, J.; Rivera, C.; Xiong, W.; Zhang, Y.; Wilson, J.R.; Cho, K.; Handler, T.; Mitchell, R.; Engh, D.; Hosack, M.; Johns, W.E.; Nehring, M.; Sheldon, P.D.; Stenson, K.; Webster, M.; Sheaff, M., E-mail: jcumalat@pizero.colorado.edu2002
AbstractAbstract
[en] We describe the various techniques developed in the Fermilab Wideband Experiments, E687 and FOCUS, to reconstruct long-lived states. The techniques all involve modifications to standard tracking techniques and are useful to report for future experiments
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S0168900201020654; Copyright (c) 2002 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment; ISSN 0168-9002;
; CODEN NIMAER; v. 484(1-3); p. 174-193

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Tomášik, Boris; Kolomeitsev, Evgeni E, E-mail: boris.tomasik@cern.ch2016
AbstractAbstract
[en] We present a minimal statistical model designed for the description of rare- hadron multiplicities in nucleus-nucleus collisions at energies below the threshold of the particle production in binary elementary collisions. Differences to more conventional canonical statistical model are explained. The minimal statistical model is applied to the description of multiplicity ratios involving Ξ hyperons, which are measured by the HADES collaboration at GSI-SIS. It is argued that the HADES data cannot be reproduced by the model based on the statistical equilibrium and the strangeness conservation. The data remain underpredicted even when inmedium potentials acting on hadrons are taken into account. This hints to non-equilibrium production of the Ξ hyperons and their continuous freeze-out. (paper)
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SQM2015: 15. international conference on strangeness in quark matter; Dubna (Russian Federation); 6-11 Jul 2015; Available from http://dx.doi.org/10.1088/1742-6596/668/1/012089; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Conference
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Journal of Physics. Conference Series (Online); ISSN 1742-6596;
; v. 668(1); [4 p.]

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Schmidt, S.
NA48-Kollaboration2001
NA48-Kollaboration2001
AbstractAbstract
No abstract available
Original Title
Messung der Zerfallsasymmetrie des radiativen Hyperonzerfalls Ξ0→Λγ
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2001 spring meeting of Fachverbaende Gravitation und Relativitaetstheorie (GR), Teilchenphysik (T), and Theoretische und Mathematische Grundlagen der Physik (MP) of Deutsche Physikalische Gesellschaft e.V. (DPG) with physics and book exhibition; Fruehjahrstagung 2001 der Fachverbaende Gravitation und Relativitaetstheorie (GR), Teilchenphysik (T), und Theoretische und Mathematische Grundlagen der Physik (MP) der Deutschen Physikalischen Gesellschaft e.V. (DPG) mit Physik- und Buchausstellung; Bonn (Germany); 26-30 Mar 2001
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Journal Article
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Verhandlungen der Deutschen Physikalischen Gesellschaft; ISSN 0420-0195;
; CODEN VDPEAZ; v. 36(3); p. 72

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Ikeda, Kiyomi; Takahashi, Miho; Fukuda, Tomokazu; Motoba, Toshio; Yamamoto, Yasuo.
Tokyo Univ., Tanashi (Japan). Inst. for Nuclear Study1993
Tokyo Univ., Tanashi (Japan). Inst. for Nuclear Study1993
AbstractAbstract
[en] A scenario is given for the formation of Ξ- states and the transitions to states with double-Λ in anticipation of observations, especially in the KEK-E224 experiment. First, the production cross sections of Ξ- hypernuclear states by (K-, K+) reactions are calculated within the framework of the distorted-wave impulse approximation. Next, the transition rates from Ξ- hypernuclear states to possible double-Λ states are obtained, which are closely related to single- and double-Λ emissions after the Ξ-p→ΛΛ conversion in nuclei. (author)
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Jun 1993; 13 p
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Report
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Paul Mattione
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States). Funding organisation: USDOE - Office of Energy Research ER (United States)2007
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States). Funding organisation: USDOE - Office of Energy Research ER (United States)2007
AbstractAbstract
[en] The eg3 experiment at the Jefferson Lab CLAS detector aims to determine the existence of the Ξ5 pentaquarks and investigate the excited Ξ states. Specifically, the exotic Ξ5-- pentaquark will be sought by first reconstructing the Ξ- particle through its weak decays, Ξ- → π-Λ and Λ → π-. A kinematic fitting routine was developed to reconstruct the detached vertices of these decays, where confidence level cuts on the fits are used to remove background events. Prior to fitting these decays, the exclusive reaction γD → ppπ- was studied in order to correct the track measurements and covariance matrices of the charged particles. The Λ → pπ- and Ξ- → π-Λ decays were then investigated to demonstrate that the kinematic fitting routine reconstructs the decaying particles and their detached vertices correctly
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1 May 2007; 148 p; DOE/OR--23177-0042; AC05-06OR23177; Available from http://www1.jlab.org/Ul/Publications/documents/JLAB-PHY-07-643.pdf; PURL: https://www.osti.gov/servlets/purl/903056-jg2pio/; Submitted to Rice Univ., Houston, TX (US); Thesis (M.S.)
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Miscellaneous
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Thesis/Dissertation
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AbstractAbstract
[en] The strange hadronic matter with nucleon, Λ-hyperon and Ξ-hyperon is studied by using a chiral symmetry model in a mean-field approximation. The saturation properties and stabilities of the strange hadronic matter are discussed. The result indicates a quite large strangeness fraction (fs) region where the strange hadronic matter is stable against particle emission. In the large fs region, the Ξ component dominates, resulting in a deep minimum in the curve of the binding energy per baryon EB versus the strangeness fraction fs will (EB, fs) ≅ (-26.0 MeV, 1.23)
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Journal Article
Journal
Chinese Physics Letters; ISSN 0256-307X;
; v. 17(12); p. 874-876

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Myint, K.S.; Akaishi, Yoshinori.
Tokyo Univ., Tanashi (Japan). Inst. for Nuclear Study1994
Tokyo Univ., Tanashi (Japan). Inst. for Nuclear Study1994
AbstractAbstract
[en] We perform theoretical analysis on the structure and decay of a double-strangeness five-body system which consists of ΛΛ5H and ≡5H states. In this S=-2 five-body system the thresholds of the tΛΛ channel and the α≡- channel come closer with only 8.51 MeV difference. We treat both bound and resonant states of the three-body channels tΛΛ and tp≡- by applying a complex rotation method. It is found that there is a bound ΛΛ5H state with 6.3 MeV below the threshold of t+Λ+Λ. In the ≡- channel a resonant ≡5H state appears at 1.7 MeV below the threshold of α+≡-. Though the existence of this state is ensured by the Coulomb interaction, it is a 'halo' nuclear state rather than an atomic state as judged from its size. The conversion width of this state is 0.2 MeV which is extremely narrow. It is also found that ≡ mixing into the ΛΛ5H ground state is small with 1.0 %. For the ΛΛ5H state, the weak decay to the α+Σ- final state produces a high mono-energetic Σ- with branching ratio of 5.5 %. Thus the Σ- with discrete energy would become a clear signature of the forming of the ΛΛ hypernucleus. (author)
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Sep 1994; 29 p
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Steinheimer, J.; Botvina, A.S.; Bleicher, M., E-mail: bleicher@fias.uni-frankfurt.de2016
AbstractAbstract
[en] In these proceedings we discuss recent developments in the microscopic description of strange particle production in nuclear collisions. We put a special emphasis on the production of hypernuclei at the upcoming FAIR and NICA facilities as well as the deep sub threshold, ϕ and Ξ"- production yields measured with the HADES experiment. Employing new resonance decay channels we obtain a satisfactory description of ϕ and Ξ"- production in deep sub threshold Ar+KCl reactions. Our results implicate that no new medium effects are required to describe the rare strange particle production data from low energy nuclear collisions. (paper)
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SQM2015: 15. international conference on strangeness in quark matter; Dubna (Russian Federation); 6-11 Jul 2015; Available from http://dx.doi.org/10.1088/1742-6596/668/1/012007; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Conference
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Journal of Physics. Conference Series (Online); ISSN 1742-6596;
; v. 668(1); [8 p.]

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AbstractAbstract
[en] We will begin with the H particle, stranglets and strange matter since these proposed objects are a strong motivation for studying hypernuclei containing two strange quarks. The data on ΛΛ and Ξ hypernuclei will then be reviewed, as well as experiments in progress or scheduled. Many have contributed to the work that will be discussed, which took place primarily at KEK and BNL. At this time of transition, and anticipation of new experimental results and facilities, we take time to remember Carl Dover and Hiro Bando who contributed so much to this field
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1996; 13 p; 25. INS international symposium on nuclear and particle physics with high-intensity proton accelerators; Tokyo (Japan); 3-6 Dec 1996; CONF-961230--3; CONTRACT AC02-76CH00016; Also available from OSTI as DE97006099; NTIS; US Govt. Printing Office Dep
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