ANOMALOUS ELECTRON-PAIR PRODUCTION IN PI-P COLLISIONS

被引：8

作者：

BOTTCHER, C

STRAYER, MR

ALBERT, CJ

ERNST, DJ

机构：

[1] TEXAS A&M UNIV SYST,CTR THEORET PHYS,COLLEGE STN,TX 77843

[2] TEXAS A&M UNIV SYST,DEPT PHYS,COLLEGE STN,TX 77843

来源：

PHYSICS LETTERS B | 1990年 / 237卷 / 02期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0370-2693(90)91424-A

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Anomalous e+e- pairs with invariant mass 0.2 ≤ M ≤ 0.7 GeV / c2 have been observed in the collision of pions with protons at a momentum pπ{reversed tilde equals}16 GeV/c. Conventional hadronic mechanisms have been unable to reproduce the qualitative features of the observed spectra. The two-photon mechanism for pair production is evaluated in a semi-classical limit. The resulting differential cross sections as a function of the invariant mass, Feynman x, and transverse momentum of the pair are in reasonable quantitative agreement with the data. The dominant contribution to the pair amplitude arises from the magnetic spin-flip term of the proton current. These anomalous lepton pairs are thus consistent with an ab initio calculation of the two-photon mechanism. © 1990.

引用

页码：175 / 180

页数：6

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