Evidence for a narrow |S|=1 baryon state at a mass of 1528 MeV in quasi-real photoproduction

被引：325

作者：

Airapetian, A ^{[1
]}

Akopov, N

Akopov, Z

Amarian, M

Ammosov, VV

Andrus, A

Aschenauer, EC

Augustyniak, W

Avakian, R

Avetissian, A

Avetissian, E

Bailey, P

Balin, D

Baturin, V

Beckmann, M

Belostotski, S

Bernreuther, S

Bianchi, N

Blok, HP

Böttcher, H

Borissov, A

Borysenko, A

Bouwhuis, M

Brack, J

Brüll, A

Bryzgalov, V

Capitani, GP

Chen, T

Chen, X

Chiang, HC

Ciullo, G

Contalbrigo, M

Dalpiaz, PF

Deconinck, W

De Leo, R

De Nardo, L

De Sanctis, E

Devitsin, E

Di Nezza, P

Düren, M

Ehrenfried, M

Elalaoui-Moulay, A

Elbakian, G

Ellinghaus, F

Elschenbroich, U

Ely, J

Fabbri, R

Fantoni, A

Fechtchenko, A

Felawka, L

机构：

[1] Univ Alberta, Dept Phys, Edmonton, AB T6G 2J1, Canada

[2] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA

[3] Ist Nazl Fis Nucl, Sez Bari, I-70124 Bari, Italy

[4] Peking Univ, Sch Phys, Beijing 100871, Peoples R China

[5] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China

[6] Univ Colorado, Nucl Phys Lab, Boulder, CO 80309 USA

[7] DESY, D-22603 Hamburg, Germany

[8] DESY, D-15739 Zeuthen, Germany

[9] Joint Inst Nucl Res, Dubna 141980, Russia

[10] Univ Erlangen Nurnberg, Inst Phys, D-90158 Erlangen, Germany

[11] Univ Ferrara, Ist Nazl Fis Nucl, Sez Ferrara, I-44100 Ferrara, Italy

[12] Univ Ferrara, Dipartimento Fis, I-44100 Ferrara, Italy

[13] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

[14] Univ Ghent, Dept Subatom & Radiat Phys, B-9000 Ghent, Belgium

[15] Univ Giessen, Inst Phys, D-35392 Giessen, Germany

[16] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

[17] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[18] MIT, Nucl Sci Lab, Cambridge, MA 02139 USA

[19] Univ Michigan, Randall Lab Phys, Ann Arbor, MI 48109 USA

[20] PN Lebedev Phys Inst, Moscow 117924, Russia

[21] Univ Munich, Sekt Phys, D-85748 Garching, Germany

[22] NIKHEF H, Natl Inst Kernfys & Hoge Energiefys, NL-1009 DB Amsterdam, Netherlands

[23] Petersburg Nucl Phys Inst, Gatchina 188350, Russia

[24] Inst High Energy Phys, Protvino 142281, Moscow Region, Russia

[25] Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany

[26] Ist Nazl Fis Nucl, Sez Roma 1, Grp Sanita, I-00161 Rome, Italy

[27] Ist Super Sanita, Phys Lab, I-00161 Rome, Italy

[28] Simon Fraser Univ, Dept Phys, Burnaby, BC V5A 1S6, Canada

[29] TRIUMF, Vancouver, BC V6T 2A3, Canada

[30] Tokyo Inst Technol, Dept Phys, Tokyo 152, Japan

[31] Vrije Univ Amsterdam, Dept Phys & Astron, NL-1081 HV Amsterdam, Netherlands

[32] Andrzej Soltan Inst Nucl Studies, PL-00689 Warsaw, Poland

[33] Yerevan Phys Inst, Yerevan 375036, Armenia

来源：

PHYSICS LETTERS B | 2004年 / 585卷 / 3-4期

基金：

英国工程与自然科学研究理事会; 加拿大自然科学与工程研究理事会; 日本学术振兴会; 中国国家自然科学基金; 美国国家科学基金会;

关键词：

glueball and nonstandard multi-quark/gluon states; photon and charged-lepton interactions with hadrons; baryon production; baryons;

D O I：

10.1016/j.physletb.2004.01.079

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Evidence for a narrow baryon state is found in quasi-real photoproduction on a deuterium target through the decay channel pK(S)(0) --> ppi(+)pi(-). A peak is observed in the pK(S)(0) invariant mass spectrum at 1528 +/- 2.6(stat) +/- 2.1(syst) MeV. Depending on the background model, the naive statistical significance of the peak is 4-6 standard deviations and its width may be somewhat larger than the experimental resolution of sigma = 4.3-6.2 MeV. This state may be interpreted as the predicted S = +1 exotic Theta(+)(uudd (s) over bar) pentaquark baryon. No signal for an hypothetical Theta(++) baryon was observed in the pK(+) invariant mass distribution. The absence of such a signal indicates that an isotensor Theta is excluded and an isovector Theta is unlikely. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：213 / 222

页数：10

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