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ADEVA 1990R

L3 collaboration; Adeva, B. et al.
A Measurement of B^o anti-B^o Mixing in Z^o Decays
Phys. Lett. 252B (1990) 703;

Abstracts
We have observed B^o anti-B^o mixing in Z⁰ → b anti-b decays using hadronic events containing dileptons. The data sample corresponds to 118200 hadron events at = M_Z. From a fit to the dilepton p and p_bot spectra, we determine the mixing parameter to be χ_B = 0.178^+0.049_-0.040.

Accelerator CERN-LEP Detectors L3

Related references
More (earlier) information appears in
L3 Collab., B. Adeva et al., Phys. Lett. 241B (1990) 416;

Experiment comments
Total integrated luminosity 5.5 pb^-1.

Reactions

	e+ e– e– e+ X	88.2-94.2 GeV (Ecm)	p, pt
	e+ e– μ– μ+ X	88.2-94.2 GeV (Ecm)	p, pt
	e+ e– 2μ+ X	88.2-94.2 GeV (Ecm)	p, pt
	e+ e– 2e+ X	88.2-94.2 GeV (Ecm)	p, pt
	e+ e– 2e– X	88.2-94.2 GeV (Ecm)	p, pt
	e+ e– 2μ– X	88.2-94.2 GeV (Ecm)	p, pt
	e+ e– μ+ e– X	88.2-94.2 GeV (Ecm)	p, pt
	e+ e– μ– e+ X	88.2-94.2 GeV (Ecm)	p, pt
	e+ e– μ+ e+ X	88.2-94.2 GeV (Ecm)	p, pt
	e+ e– μ– e– X	88.2-94.2 GeV (Ecm)	p, pt
	e+ e– Zo	88.2-94.2 GeV (Ecm)
	Zo Bo anti-Bo
	Zo Bs anti-Bs
	Bo anti-Bo		amp, qnc, const
	Bs anti-Bs		amp, qnc, const
	anti-Bo Bo		amp, qnc, const
	anti-Bs Bs		amp, qnc, const
	Bo μ+ X
	Bo e+ X
	Bs μ+ X
	Bs e+ X

Particles studied

	Bo	pw
	anti-Bo	pw
	Bs	pw
	anti-Bs	pw

Record comments
Another confirmation of B_s- anti-B_s mixing.

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