Are operators describing b→sγ

• Published in: Chinese physics C Vol. 35; no. 1; pp. 6 - 10
• Main Author: 董繁龙 王雯宇 熊兆华
• Format: Journal Article
• Language: English
• Published: IOP Publishing 2011; Institute of Theoretical Physics,College of Applied Science,Beijing University of Technology,Beijing 100124,China
• Subjects: 经营者; off-shell quarks effect; Ward identity; new Feynman diagrams
• ISSN: 1674-1137; 0254-3052; 2058-6132
• DOI: 10.1088/1674-1137/35/1/002

The operators of b→ sγ, b →sl＋l- are usually regarded as being sufficient to describe b →sγγ, b → sl＋l-T with the statement that contributions from diagrams without an effective vertex b --＊ ST to processes b →sγγ and b →sl＋l-T are negligible. In this work we present a comprehensive analysis of the transition b→sγγ and find that 1） Effects due to off-shell quarks in vertex b → sγ on b →sγγ are large; 2） Contributions from diagrams without an effective vertex b →sγ to b →sγγ are not negligible compared with others; 3） These effects cancel each other out exactly, so the operators of b→sγ can safely be used to describe b →sγγ.