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Paper Information

Journal:   JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY)   SPRING 2009 , Volume 19 , Number 71 (PHYSIC ISSUE); Page(s) 35 To 62.
 
Paper: 

TREE-LEVEL AND SECOND ORDER GLUON PENGUIN STRUCTURE IN B MESON DECAYS

 
 
Author(s):  MEHRABAN H.*
 
* PHYSICS DEPARTMENT, SEMNAN UNIVERSITY, SEMNAN, IRAN
 
Abstract: 
Introduction: Weak decays of heavy quarks test the Standard Model and can be used to determine its parameters, including the weak mixing angles of the CKM matrix. In addition, the study of heavy quark decay provides important insight into the least well understood sector of the strong interaction. Decays of the b quark play a unique role for physics of the CKM matrix. This is also an important place to test our understanding of interplay between strong and weak interaction. Higher order decays of the b quark are also a sensitive window for physics beyond the Standard Model. In the Standard Model, flavor-changing neutral currents are forbidden, for example, there is no direct coupling between the b quark and the s or d quarks. Effective flavor-changing neutral currents are induced by penguin diagrams, where a quark emits and reabsorbs a W, thus changing flavors twice. Penguin decays have become increasingly appreciated in recent years. These loop diagrams with their interesting combination of CKM matrix elements give insight into the Standard Models.Aim: Obtaining the second order approximation part of gluon penguin in various b quark and B Meson decays.Materials and Methods: In this research, we are going to study weak interaction, Quark and Standard Models. According to Effective Hamiltonian Theory, we deduced various two and three body of B meson decays from various decays of b Quark ModelsResults: The amplitude of decays of tree level and gluon penguin structure in Quark Model up to the first and second orders approximation calculated. We calculated the amplitude of tree level plus gluon penguin on lowest order of the strong coupling constant as=0.2 for first order of the decay processes b®qi qk q̅j+qk qi q̅j̅ and for second order of the decay processes b® qi qk q̅j+qk qi q̅j̅ (qoq̅p) Also the decay rates of various decays of b quark up to the first and second orders approximation of the tree level plus penguin structure calculated.Conclusion: Comparing of theoretical and experimental values of decay rates and branching ratios, we consider that, the decay rate of the second order decays are much smaller than the first ones and the tree level dominated.Finally we compared the branching ratios of various decays of B meson, theoretically and experimentally and saw that the second order of gluon penguin term in b quark decays is small.
 
Keyword(s): TREE LEVEL, GLUON PENGUIN, QUARK MODEL, STANDARD MODEL, B QUARK, B MESON, DECAY RATE, BRANCHING RATIOS
 
 
References: 
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Citations: 
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+ Click to Cite.
APA: Copy

MEHRABAN, H. (2009). TREE-LEVEL AND SECOND ORDER GLUON PENGUIN STRUCTURE IN B MESON DECAYS. JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY), 19(71 (PHYSIC ISSUE)), 35-62. https://www.sid.ir/en/journal/ViewPaper.aspx?id=262548



Vancouver: Copy

MEHRABAN H.. TREE-LEVEL AND SECOND ORDER GLUON PENGUIN STRUCTURE IN B MESON DECAYS. JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY). 2009 [cited 2021December09];19(71 (PHYSIC ISSUE)):35-62. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=262548



IEEE: Copy

MEHRABAN, H., 2009. TREE-LEVEL AND SECOND ORDER GLUON PENGUIN STRUCTURE IN B MESON DECAYS. JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY), [online] 19(71 (PHYSIC ISSUE)), pp.35-62. Available: https://www.sid.ir/en/journal/ViewPaper.aspx?id=262548.



 
 
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