Pruss, S.M.
DSIG/DZ
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Measurement of inelastic J / psi photoproduction at HERA

The ZEUS collaboration Breitweg, J. ; Derrick, M. ; Krakauer, D. ; et al.
Z.Phys.C 76 (1997) 599-612, 1997.
Inspire Record 446830 DOI 10.17182/hepdata.44512

We present a measurement of the inelastic, non diffractive J/$\psi$ photoproduction cross section in the reaction $e^{+} p \to e^{+} {J}/\psi X$ with the ZEUS detector at HERA. The J/$\psi$ was identified using both the $\mu^{+}\mu^{-}$ and $e^{+}e^{-}$ decay channels and events were selected within the range $0.4 1$ GeV$^2$, NLO calculations of the photon-gluon fusion process based on the colour-singlet model are in good agreement with the data. The predictions of a specific leading order colour-octet model, as formulated to describe the CDF data on J/$\psi$ hadroproduction, are not consistent with the data.

13 data tables
Table 1

Cross section for the MU+ MU- decay channel.

Table 2

Cross section for the MU+ MU- decay channel.

Table 3

Cross section for the MU+ MU- decay channel.

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rivet Analysis
Inclusive pi+-, K+- and (p, anti-p) differential cross-sections at the Z resonance

The ALEPH collaboration Buskulic, D. ; Casper, D. ; De Bonis, I. ; et al.
Z.Phys.C 66 (1995) 355-366, 1995.
Inspire Record 382179 DOI 10.17182/hepdata.48315

Inclusive π±, K± and\((p,\bar p)\) differential cross-sections in hadronic decays of the Z have been measured as a function ofz=Phadron/Pbeam, the scaled momentum. The results are based on approximately 520 000 events measured by the ALEPH detector at LEP during 1992. Charged particles are identified by their rate of ionization energy loss in the ALEPH Time Projection Chamber. The position, ξ*, of the peak in the ln(1/z) distribution is determined, and the evolution of the peak position with centre-of-mass energy is compared with the prediction of QCD.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.