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ARNISON 1984G

UA1 collaboration; Arnison, G. et al.
Observation of Muonic Z^o Decay at the anti-p p Collider
Phys. Lett. 147B (1984) 241;

Abstracts
We report the observation of five muonic Z^o decays. The mass and cross section times branching ratio is consistent with the previous measurements of Z^o → μ⁺ μ^–. Three of the muonic decays have unexpected features. One event is of the type Z^o → μ⁺ μ^– γ. Two of the Z^o → μ⁺ μ^– decays are accompanied by several (>4) energetic (E_T > 10 GeV) jets which are difficult to explain within the framework of standard QCD corrections.

Accelerator CERN-PBAR/P Detectors UA1

Related references
See also
UA1 Coll., G. Arnison et al., Phys. Lett. 132B (1983) 214;
UA1 Coll., G. Arnison et al., Phys. Lett. 126B (1983) 398;
UA1 Coll., G. Arnison et al., Phys. Lett. 139B (1984) 115;
UA1 Coll., G. Arnison et al., Phys. Lett. 135B (1984) 250;
UA1 Coll., G. Arnison et al., Phys. Lett. 134B (1984) 469;
A. Salam, Elementary Particle Theory, ed. N. Svartholm, Stockholm: Almqvist and Wiksell (1968) 367;
M. Calvetti et al., Nucl. Instr. and Meth. 176 (1980) 255;
B. Humpert, Phys. Lett. 85B (1979) 293;
S. L. Glashow, Nucl. Phys. 22 (1961) 579;
S. Weinberg, Phys. Rev. Lett. 19 (1967) 1264;
M. Barranco Luque et al., Nucl. Instr. and Meth. 176 (1980) 175;

Reactions

	anti-p p μ– μ+ X	540 GeV (Ecm)	mass, pt
	anti-p p μ– μ+ γ X	540 GeV (Ecm)	mass, pt
	anti-p p Zo X	540 GeV (Ecm)	cs
	anti-p p Zo mult [jet]	540 GeV (Ecm)	cs
	Zo μ– μ+
	Zo μ– μ+ γ

Particles studied

Zo

mass, pw

Record comments
Confirmation of Z^o boson production. Observation of Z^o → μ⁺ μ^– decay.

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