Dilepton anisotropy from p+Be and Ca+Ca collisions at BEVALAC energies

被引：23

作者：

Bratkovskaya, EL ^{[1
]}

Cassing, W ^{[1
]}

Mosel, U ^{[1
]}

机构：

[1] JOINT INST NUCL RES,THEORET PHYS LAB,BOGOLIUBOV LAB THEORET PHYS,DUBNA 141980,RUSSIA

来源：

PHYSICS LETTERS B | 1996年 / 376卷 / 1-3期

关键词：

heavy-ion collisions; leptons;

D O I：

10.1016/0370-2693(96)00302-4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A full calculation of lepton-pair angular characteristics is carried out for e(+)e(-) pairs created in p + Be and Ca + Ca collisions from 1.0 to 2.1 GeV/A. It is demonstrated that the dilepton decay anisotropy depends sensitively on the different sources and may be used for disentangling them. Due to the dominance of the eta- and Delta-Dalitz decays and only a small anisotropy coefficient for pi(+)pi(-) annihilation, the expected anisotropy coefficients show a decrease with invariant mass of the dilepton pair and change only moderately when comparing p + Be and Ca + Ca reactions at the same bombarding energy.

引用

页码：12 / 18

页数：7

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