MEASUREMENT OF PI-0-PI-0 PRODUCTION IN 2-PHOTON COLLISIONS

被引：197

作者：

MARSISKE, H

ANTREASYAN, D

BARTELS, HW

BESSET, D

BIELER, C

BIENLEIN, JK

BIZZETI, A

BLOOM, ED

BROCK, I

BROCKMULLER, K

CABENDA, R

CARTACCI, A

CAVALLISFORZA, M

CLARE, R

COMPAGNUCCI, A

CONFORTO, G

COOPER, S

COWAN, R

COYNE, D

ENGLER, A

FAIRFIELD, K

FOLGER, G

FRIDMAN, A

GAISER, D

GELPHMAN, D

GLASER, G

GODFREY, G

GRAAF, K

HEIMLICH, FH

HEINSIUS, FH

HOFSTADTER, R

IRION, J

JAKUBOWSKI, Z

JANSSEN, H

KARCH, K

KEH, S

KIEL, T

KILIAN, H

KIRKBRIDE, I

KLOIBER, T

KOBEL, M

KOCH, W

KONIG, AC

KONIGSMANN, K

KRAEMER, RW

KRUGER, S

LANDI, G

LEE, R

LEFFLER, S

LEKEBUSCH, R

机构：

[1] CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213

[2] UNIV CALIF SANTA CRUZ,SANTA CRUZ,CA 95064

[3] UNIV ERLANGEN NURNBERG,W-8520 ERLANGEN,GERMANY

[4] CRACOW INST NUCL PHYS,PL-30055 KRAKOW,POLAND

[5] CALTECH,PASADENA,CA 91125

[6] UNIV FIRENZE,I-50100 FLORENCE,ITALY

[7] UNIV HAMBURG,INST EXPTL PHYS 1,W-2000 HAMBURG 13,GERMANY

[8] HARVARD UNIV,CAMBRIDGE,MA 02138

[9] STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305

[10] NIKHEF NIJMEGEN,6525 ED NIJMEGEN,NETHERLANDS

[11] STANFORD UNIV,HIGH ENERGY PHYS LAB,STANFORD,CA 94305

[12] PRINCETON UNIV,PRINCETON,NJ 08544

[13] IST NAZL FIS NUCL,I-50100 FLORENCE,ITALY

[14] UNIV WURZBURG,W-8700 WURZBURG,GERMANY

[15] STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305

[16] CATHOLIC UNIV NIJMEGEN,6525 ED NIJMEGEN,NETHERLANDS

来源：

PHYSICAL REVIEW D | 1990年 / 41卷 / 11期

关键词：

D O I：

10.1103/PhysRevD.41.3324

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The reaction e+e-e+e-00 has been analyzed using 97 pb-1 of data taken with the Crystal Ball detector at the DESY e-e+ storage ring DORIS II at beam energies around 5.3 GeV. For the first time we have measured the cross section for 00 for 00 mvariant masses ranging from threshold to about 2 GeV. We measure an approximately flat cross section of about 10 nb for W=m00<0.8 GeV, which is below 0.6 GeV, in good agreement with a theoretical prediction based on an unitarized Born-term model. At higher invariant masses we observe formation of the f2(1270) resonance and a hint of the f0(975). We deduce the following two-photon widths: f2(1270))=3.19±0.16±0.280.29 keV and (f0(975))<0.53 keV at 90% C.L. The decay-angular distributions show the 00 system to be dominantly spin 0 for W<0.7 GeV and spin 2, helicity 2 in the f2(1270) region, with helicity 0 contributing at most 22% (90% C.L.). © 1990 The American Physical Society.

引用

页码：3324 / 3335

页数：12

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