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1、吴兴刚 重庆大学物理系高能物理分会第八届全国会员代表大会暨学术年会,双重味重子Xicc强产生机制的研究,近期完成与双重味Xicc重子有关的工作 In collaboration with Prof.Z.X. Zhang, J.X.Wang, C.F. Qiao, J.P. MaProgress Basis: BCVEGPY (V1.0, V 2.0WIN, V2.1LINUX, V3.0?) 1) Comput.Phys.Commun.177, 467- 478 (2007) 2) Comput.Phys.Commun.181, 1144-1149 (2010)= GENXICC = Theo
2、retical Prediction =1) Phys.Rev.D73, 094022 (2006) 2) J.Phys.G34, 845 (2007),B.K. Abbott, R.J. Van Kooten - D0,报告主要内容,3. Prospects,1. Background,2. Xicc Generator GENXICC, Basic Properties (V1.0) New Improvements (V2.0) Results for Hadronic Production of Xicc at LHC,1. Background,Phys.Lett.B628:18-2
3、4,2005.,07年结果仍然没有确定结论 因此理论上仔细研究产生及衰变过程是完全必须的,Xicc强产生机制 (production of diquark pair first and then diquark fragment into baryon with 100% efficiency) (GM-VFN) 1) gluon-gluon fusion mechanism2) gluon-charm collision mechanism3) charm-charm collision mechanism- the above is for extrinsic charm - 4) Int
4、rinsic charms contribution (model dependent),Similar to Bc case,1980:BHPS-model,DGLAP,J.Pumplin, CTEQ, PRD73,114015(2006),Intrinsic Charm model,2. Xicc Generator GENXICC,该过程硬散射振幅的计算与Bc介子类似，最大区别在于颜色因子的不同。将颜色因子提出之后，所有图形的处理（拆分，组成，分类）完全一致。,改进后的螺旋度振幅方法：能有效处理有质量夸克线及改进数值处理方式,类比,程序化简核心思想 通过图形的拆分找到所有费曼图中最基本的
5、架构 =基本QED图= 最大程度合并同类项 振幅做数值 (3s1),Results for Xicc, Xibc and Xibb Production,程序正确性检验,LHC, TEVATRON can not see the difference between the cases of with or with intrinsic charm, Due to its high efficiency, GENXICC, together with BCVEGPY shall be very useful for MC simulation and also for theoretical
6、studies. More applications shall be available., The coming LHC experiment shall provide a better platform to check all the theoretical predications and to learn the Xicc, Xibc, Xibb properties in more detail. This generator is now used by D0 group., Together with the decay channel calculation, we can obtain a full estimation of Xicc, and hence have a better comparison with SELEX experiment.,4. Prospects,Thanks !,
