Evidence for the positive-strangeness pentaquark Θ+ in photoproduction with the SAPHIR detector at ELSA

被引：374

作者：

Barth, J

Braun, W

Ernst, J

Glander, KH

Hannappel, J

Jöpen, N

Kalinowsky, H

Klein, F

Klempt, E ^{[1
]}

Lawall, R

Link, J

Menze, D

Neuerburg, W

Ostrick, M

Paul, E

van Pee, H

Schulday, I

Schwille, WJ

Wiegers, B

Wieland, FW

Wisskirchen, J

Wu, C

机构：

[1] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-5300 Bonn, Germany

[2] Univ Bonn, Inst Phys, D-5300 Bonn, Germany

来源：

PHYSICS LETTERS B | 2003年 / 572卷 / 3-4期

关键词：

other particles; pentaquark with strangeness S=1;

D O I：

10.1016/j.physletb.2003.08.019

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The positive-strangeness baryon resonance (Theta(+) is observed in photoproduction of the nK+K-S(0) final state with the SAPHIR detector at the Bonn ELectron Stretcher Accelerator ELSA. It is seen as a peak in the nK(+) invariant mass distribution with a 4.8sigma confidence level. We find a mass MTheta+ = 1540 +/- 4 +/- 2 MeV and an upper limit of the width Gamma(Theta+) < 25 MeV at 90% c.l. The photoproduction cross section for (K) over bar (0)Theta(+) is in the order of 300 nb. From the absence of a signal in the pK(+) invariant mass distribution in gammap --> pK(+)K(-) at the expected strength we conclude that the Theta(+) must be isoscalar. (C) 2003 Published by Elsevier B.V.

引用

页码：127 / 132

页数：6

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