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THE INFORMATION OF MASTER THESIS Student’s name: Nguyen Thi Yen Sex: Female Date of birth: 04/01/1987 Place of birth: Khanh Thien – Yen Khanh - Ninh Binh Decide to confirm student No: 3568/QĐ-CTSV December 31st, 2009 of Natural Science University- Hanoi National University Changes in training process: Thesis Title: “The sparticle’s scattering Process” Major (specialties): Theoretical Physic and Mathematical Physic Code: 60 44 01 10 Supervisor: Pham Thuc Tuyen, PhD - Natural Science University- Hanoi National University 11 Summarize the Thesis’s outcomes: - Presented the basic concepts of Super Symmetry, or SUSY to conclude that Largrangian interact between particles and particles ,particles and sparticles, and sparticles together - Summarized the features of scattering problems, necessary formulas for calculation such as: S-matrix, the significant of S- Matrix, a full-scattering cross section , differential scattering cross section … S fi fi i(2 )4 ( p f pi ) M fi d 1 p M fi d p W (4 ) W (1) (2) differential scattering cross section in centered block reference system : d M fi d CM (8 W)2 (3) - Calculated a scattering process ( e e ) in which, there were the participation of parner sparticles, that was the process of producing photino pair in the accelerator LEP, in which electron and positron would destroy each other The outcome of scattering process e e was: + Wrote the interactive Lagrangian for scattering process e e : * * Lint g sin w PL ee L ePR e R PR ee R ePL e L (4) + Calculated S- Matrix M b spin 4e 2eR t M 2 m tM e 2 2 2 u) M e ( u M m ) / ( M s d e e 2 M b M u (k1 )(1 )u ( p1 )v ( p2 ) 2 eR eR s 2( M t )(M u) (5) (6) * d * (7) * (1 )v (k2 ) u (k2 )(1 )u * ( p1 )v ( p2 )(1 )v* (k1 ) 2 4e M * 2 M b M d Tr (1 ) p p 2 s ( M eR t )( M eR u ) 2 ( s 2m ) /( M 2eR t )( M eR = -8e M u) e (8) + Calculated the differential cross section of the scattering process e e 2 d s M d s s 4me2 2 2 m u M 2 m 16m2 M 2 s( M 2 m ) t M e e e e 2 2 e t M (M e t )( M e u ) Me u (9) 2 d s M 1 cos 1 e d 8M s (10) The selection the scattering process producing sparticles from the destruction e e pair is in the plan At the present, although we have big colliders ( LHC), the data collected from the accelerator lepton (LEP) are still splendid and play an important role in searching and confirming the conclusions of SUSY Moreover, the accelerators also reach a non-small energy scale (level TeV ), thus, all of theoretical calculation can be checked in these centers Clearly, the scattering cross section of process is not and so, e e we have opportunities to study the effect of sparticles’ existence if we think about the positive process We get the expression No when we ignore the volume of electron However, this expression is small and limited; it means the volume of selectron is not small.If the Super Symmetry existed, it was violated / s The dependence of scattering cross section on fraction M 2 / s 4M 1/2 3/2 not is the state P which is suitable with proves that, the state of conclusion that photino is particles with spin 1/2 12 The capacity of applying in practical (If there is anyone) 13 The direction of following studies: (If there is anyone) 14 Published studies related to the Thesis: Month 12 Day 18 Student Nguyen Thi Yen Year 2011