J/ψ→重子+反重子衰变的HoWL产生子的效率修正(英文)  

Efficiency Correction to HOWL Generator of J/ψ→Baryon Antibaryon Decays

作　　者：平荣刚[1] 李海波[2] 

机构地区：[1]中国高等科学技术中心,北京100080 [2]中国科学院高能物理研究所,北京100049

出　　处：《高能物理与核物理》2006年第9期819-823,共5页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(10447130,10375074,10491303)资助~~

摘　　要：发展了一种基于跃迁振幅信息的Monte-Carlo产生子来研究纯相空间产生子(HOWL)的效率修正．对J/ψ→p(?),Λ(?),pX衰变作了Monte-Carlo模拟,结果表明,这种产生子能够很好地实现末态粒子的角分布．与HOWL产生子比较,发现末态粒子的角分布会对效率产生很大的修正．所以,对于长链的级联衰变,推荐这种基于跃迁振幅信息的产生子．A kind of Monte-Carlo generator based on the transition amplitude information is developed to study the detection efficiency correction to the pure phase space（HOWL） generator. Monte-Carlo（MC） simulations for the J/ψ→ pp^-, ∧∧^-, pX decays are carried out, and the results show that angular distributions for the decayed particles can well be reproduced. Compared with the HOWL generator, we find that the generator based on amplitude information will make a large correction to the detection efficiency. Therefore we recommend that a generator with a full transition information be used to simulate the long sequential decays.

关 键 词：粲夸克偶数衰变 Monte—Carlo模拟 跃迁振幅 

分 类 号：O571.3[理学—粒子物理与原子核物理]