LIMITS FOR 2-PHOTON AND E+E- DECAY WIDTHS OF POSITRON-ELECTRON SCATTERING RESONANCES FOR SQUARE-ROOT-S = 1.78 TO 1.92 MEV

被引：10
|
作者：
WIDMANN, E
BAUER, W
CONNELL, S
MAIER, K
MAJOR, J
SEEGER, A
STOLL, H
BOSCH, F
机构：
[1] MAX PLANCK INST MET RES,INST PHYS,W-7000 STUTTGART 80,GERMANY
[2] GESELL SCHWERIONENFORSCH GMBH,W-6100 DARMSTADT 11,GERMANY
来源：
ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI | 1991年 / 340卷 / 02期
关键词：
D O I：
10.1007/BF01303834
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
Motivated by the observation of energy- and momentum-correlated e+e- pairs in heavy ion collisions, a search for resonances in e+e- scattering at the corresponding energies has been made. The e+e- decay channel is analyzed in a time window from approximately 10(-13) S to approximately 10(-11) S with a set-up optimized for low-background detection of delayed e+e- decays. The two-photon decay channel of a hypothetical resonance is investigated by measuring the two-photon annihilation-in-flight excitation function. New upper limits for the partial e+e- decay width GAMMA-eeBAR of a few meV are derived for total centre-of-mass energies square-root S between 1.78 and 1.92 MeV, taking into account the dileption as well as the two-photon decay of a neutral resonance. PACS: 14.80.Pb; 13.10. + q; 12.20.Fv
引用
收藏
页码：209 / 218
页数：10
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