The fully differential top decay distribution

European Physical Journal C: Particles and Fields

J. A. Aguilar-Saavedra¹  J. Boudreau²  J. Mueller²  C. Escobar³ 

[1] Departamento de Física Teórica y del Cosmos, Universidad de Granada;Department of Physics and Astronomy, University of Pittsburgh;Instituto de Física Corpuscular, CSIC-Universitat de València;

关键词: Charged Lepton;    Angular Momentum Conservation;    Spin Observable;    Helicity Fraction;    Boson Spin;   

DOI  :  10.1140/epjc/s10052-017-4761-5

来源: DOAJ

【 摘 要 】

Abstract We write down the four-dimensional fully differential decay distribution for the top quark decay $$t \rightarrow Wb \rightarrow \ell \nu b$$ t → W b → ℓ ν b . We discuss how its eight physical parameters can be measured, either with a global fit or with the use of selected one-dimensional distributions and asymmetries. We give expressions for the top decay amplitudes for a general tbW interaction, and show how the untangled measurement of the two components of the fraction of longitudinal W bosons – those with b quark helicities of 1 / 2 and $$-1/2$$ - 1 / 2 , respectively – could improve the precision of a global fit to the tbW vertex.

【 授权许可】

Unknown