摘要
用含有领头粒子能量衰减、Ｊ／ψ先驱体在弦色场中离解和物理Ｊ／ψ的强子吸收等三种机制的强子和弦级联模型，ＪＰＣＩＡＥ，计算了２００ＡＧｅＶ／ｃ的ＰＡ和ＡＢ轻的弹核）反应以及Ｐｂ＋Ｐｂ反应中Ｊ／ψ压低因子，取得与ＮＡ３８及ＮＡ５０数据全面地较好符合。从而对Ｐｂ＋Ｐｂ反应中Ｊ／ψ是反常压低的说法提出质疑．
The mechanisms of the energy degradation of leading particle, of theeffechve dissociation of CC pair (the precursor of physical J/ψ) in the colour electricfield of strings, and of the hadronic absorption (both baryon and meson) are introducedinto the proposed hadron and string cascade model, JPCIAE. That has been used tocalculate the J/ψ suppression factors in pA, AB (with light projectile), and Pb+Pbcollisions at 200 A GeV/c energy. The theorehcal results reproduce simultaneously boththe cormsponding NA38 and NA50 data fairly well, which arises the queshon of whtherthere art J/ψ anomalous suppressions in 158 A GeV/c Pb+Pb collisions.
出处
《高能物理与核物理》
CSCD
北大核心
1999年第7期689-692,共4页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金
核工业基金
关键词
J/ψ压低因子
领头粒子能衰减
核-核碰撞
J/ψ suppression factor, JPCIAE model, energy degradation of leadingparticle, colour, dissociation of J/ψ precursor, hadronic absorption of J/ψ
