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

被引：344

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.

引用

页数：5

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