Evidence for an exotic S =-2, Q =-2 baryon resonance in proton-proton collisions at the CERN SPS -: art. no. 042003

被引：343
|
作者：
Alt, C [1 ]
Anticic, T
Baatar, B
Barna, D
Bartke, J
Betev, L
Bialkowska, H
Billmeier, A
Blume, C
Boimska, B
Botje, M
Bracinik, J
Bramm, R
Brun, R
Buncic, P
Cerny, V
Christakoglou, P
Chvala, O
Cramer, JG
Csató, P
Darmenov, N
Dimitrov, A
Dinkelaker, P
Eckardt, V
Farantatos, G
Filip, P
Flierl, D
Fodor, Z
Foka, P
Freund, P
Friese, V
Gál, J
Gazdzicki, M
Georgopoulos, G
Gladysz, E
Hegyi, S
Höhne, C
Kadija, K
Karev, A
Kniege, S
Kolesnikov, VI
Kollegger, T
Korus, R
Kowalski, M
Kraus, I
Kreps, M
van Leeuwen, M
Lévai, P
Litov, L
Makariev, M
机构：
[1] Goethe Univ Frankfurt, Fachbereich Phys, D-60486 Frankfurt, Germany
[2] NIKHEF, NL-1009 DB Amsterdam, Netherlands
[3] Univ Athens, Dept Phys, GR-15771 Athens, Greece
[4] Comenius Univ, Bratislava 84215, Slovakia
[5] KFKI Res Inst Particle & Nucl Phys, H-1525 Budapest, Hungary
[6] MIT, Cambridge, MA 02139 USA
[7] Inst Nucl Phys, PL-31342 Krakow, Poland
[8] Gesell Schwerionenforsch mbH, D-64220 Darmstadt, Germany
[9] Joint Inst Nucl Res, Dubna 141980, Russia
[10] CERN, CH-1211 Geneva, Switzerland
[11] Univ Houston, Houston, TX 77204 USA
[12] Jan Kochanowski Univ Humanities & Sci, PL-25406 Kielce, Poland
[13] Univ Marburg, Fachbereich Phys, D-35032 Marburg, Germany
[14] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany
[15] Charles Univ Prague, Inst Nucl & Particle Phys, Prague 12116, Czech Republic
[16] Univ Washington, Nucl Phys Lab, Seattle, WA 98195 USA
[17] Sofia Univ St Kliment Ohridski, Dept Atom Phys, Sofia 1784, Bulgaria
[18] Inst Nucl Studies, PL-00681 Warsaw, Poland
[19] Univ Warsaw, Inst Expt Phys, PL-00681 Warsaw, Poland
[20] Rudjer Boskovic Inst, Zagreb 10000, Croatia
来源：
PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 04期
关键词：
D O I：
10.1103/PhysRevLett.92.042003
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Results of resonance searches in the Xi(-)pi(-), Xi(-)pi(+), Xi(+)pi(-), and Xi(+)pi(+) invariant mass spectra in proton-proton collisions at roots = 17.2 GeV are presented. Evidence is shown for the existence of a narrow Xi(-)pi(-) baryon resonance with mass of 1.862+/-0.002 GeV/c(2) and width below the detector resolution of about 0.018 GeV/c(2). The significance is estimated to be above 4.2sigma. This state is a candidate for the hypothetical exotic Xi(3/2)(--) baryon with S = -2,I = 3/2 , and a quark content of (dsds(u) over bar). At the same mass, a peak is observed in the Xi(-)pi(+) spectrum which is a candidate for the Xi(3/2)(0) member of this isospin quartet with a quark content of (dsus(d) over bar). The corresponding antibaryon spectra also show enhancements at the same invariant mass.
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页数：5
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