# Heavy Quarkonium Production in Z Decays

3 CMS
IP2I Lyon - Institut de Physique des 2 Infinis de Lyon
Abstract : We report measurements of the inclusive production of heavy quarkonium states in $\mathrm {Z}$ decays based on the analysis of 3.6 million hadronic events collected by the L3 detector at LEP. The measurement of inclusive J production and an improved $95\%$ confidence level upper limit on $\Upsilon$ production are presented. In addition, two independent measurements of the ratio, $f_{\mathrm{p}}$, of prompt J mesons to those from B decay are made using two different isolation cuts to separate prompt J mesons from J mesons produced in the decays of b hadrons. The results are: % \begin{eqnarray} \mathrm{Br}(\mathrm{Z} \rightarrow \mathrm{J} + \mathrm{X}) & = & (3.21 \pm 0.21 \; \mathrm{(stat.)} \; ^{+ 0.19}_{- 0.28} \; \mathrm{(sys.)} ) \times 10^{-3} \; , \nonumber \\ \mathrm{Br}(\mathrm {Z} \rightarrow \Upsilon(\mathrm{1S} + X) & & 4.4 \times 10^{-5} \; , \nonumber \\ %% f_{\mathrm{p}} & = & (7.1 \pm 2.1 \; \mathrm{(stat.)} \; \pm 1.2 \; \mathrm{(sys.)} \; ^{+1.5}_{-0.8} \;\mathrm{(theo.)} ) \times 10^{-2} \; . \nonumber
Document type :
Journal articles

Cited literature [20 references]

http://hal.in2p3.fr/in2p3-00003490
Contributor : Sylvie Flores <>
Submitted on : Tuesday, May 18, 1999 - 1:47:09 PM
Last modification on : Friday, December 4, 2020 - 1:22:16 PM
Long-term archiving on: : Friday, May 29, 2015 - 4:15:29 PM

### Identifiers

• HAL Id : in2p3-00003490, version 1

### Citation

M. Acciarri, P. Achard, O. Adriani, M. Aguilar-Benitez, J. Alcaraz, et al.. Heavy Quarkonium Production in Z Decays. Physics Letters B, Elsevier, 1999, 453, pp.94-106. ⟨in2p3-00003490⟩

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