Compositeness signature of Z0 in the ll-γ decay mode

Biswas, S. N. ; Rai Choudhury, S. ; Datta, K. ; Goyal, Ashok (1985) Compositeness signature of Z0 in the ll-γ decay mode Physical Review D, 31 (3). pp. 636-638. ISSN 0556-2821

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We analyze the anomalous Z0 decay events seen in recent experiments on Z0 searches within the framework of a composite model for the weak vector bosons; the model is characterized by a mass scale ΛH GF-1/2. We assume a direct four-fermion V, A coupling between leptons and the fermionic constituents of the weak bosons, and calculate the branching ratio Γ(Z0→ll-γ)/Γ(Z0→ll-). We show that this branching ratio is determined by the relative strengths of the vector and axial-vector parts of the preon current; a large radiative branching ratio requires that the current be predominantly axial vector.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:26202
Deposited On:06 Dec 2010 12:55
Last Modified:19 May 2011 09:24

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