在电子-质子碰撞中识别瞬子末态方法的蒙特卡罗研究  

A Monte Carlo Study on the Reconstruction Method for Instanton in Deep-Inelastic e^+p Scattering

作　　者：许明梅[1] 刘连寿[1] 

机构地区：[1]华中师范大学粒子物理研究所,武汉430079

出　　处：《高能物理与核物理》2007年第2期119-124,共6页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(10475030;10375025);国家教委重大项目培育基金(704035)资助~~

摘　　要：在e^+p深度非弹性散射的光子胶子融合过程中有可能出现瞬子,这是一类特殊的事件,称为瞬子参与的深度非弹性散射事件,本文用蒙特卡罗事件产生器QCDINS讨论了在瞬子参与的深度非弹性散射事件中识别瞬子末态和流喷注的方法．对各种不同方法作了对比研究．找到了一种能使重建得到的喷注能量、瞬子能量、瞬子质量与强子化前的取值均比较接近的最佳方法．Instantons can induce characteristic events in deep-inelastic e^＋p scattering. Such effects are expected to become sizable in QCD. In the present paper QCD-instanton induced events are modelled by the Monte Carlo generator QCDINS. Different methods to reconstruct the instanton part and the current jet are tried in the boson-gluon fusion events of deep-inelastic e^＋p scattering with instantons as background, using QCDINS Monte Carlo event generator. A comparison among these methods are performed and an optimum method is proposed, which can reconstruct well the energies of current jet and instanton as well as the mass of instanton. The proposed method will be useful in the Monte Carlo study of the physical properties of instanton, and can serve as a reference in the experimental identification of instanton.

关 键 词：电子质子碰撞 光子胶子融合 QCDINS蒙特卡罗事件产生器 瞬子 流喷注 

分 类 号：O571[理学—粒子物理与原子核物理]