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Leading neutron energy and p(T) distributions in deep inelastic scattering and photoproduction at HERA.

The ZEUS collaboration Chekanov, S. ; Derrick, M. ; Magill, S. ; et al.

Nucl.Phys.B 776 (2007) 1-37, 2007.

Inspire Record 744787 DOI 10.17182/hepdata.45630

The production of energetic neutrons in $ep$ collisions has been studied with the ZEUS detector at HERA. The neutron energy and $p_T^2$ distributions were measured with a forward neutron calorimeter and tracker in a $40 \pb^{-1}$ sample of inclusive deep inelastic scattering (DIS) data and a $6 \pb^{-1}$ sample of photoproduction data. The neutron yield in photoproduction is suppressed relative to DIS for the lower neutron energies and the neutrons have a steeper $p_T^2$ distribution, consistent with the expectation from absorption models. The distributions are compared to HERA measurements of leading protons. The neutron energy and transverse-momentum distributions in DIS are compared to Monte Carlo simulations and to the predictions of particle exchange models. Models of pion exchange incorporating absorption and additional secondary meson exchanges give a good description of the data.

35 data tables

Table 1

Ratio of leading neutron to inclusive cross sections integrated to the full PT range.

Table 2

Normalized double differential cross sections for leading neutron production for the full DIS sample. Statistical errors only are given.

Table 3

Normalized double differential cross sections for leading neutron production for the full DIS sample. Statistical errors only are given.

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Investigation of inclusive production of K0 and K*0 (892) mesons in K+ A interaction at 11.2-GeV

The Hyperon collaboration Akimenko, S.A. ; Belousov, V.I. ; Kolosov, V.N. ; et al.

Z.Phys.C 56 (1992) 537-546, 1992.

Inspire Record 348109 DOI 10.17182/hepdata.14531

Inclusive production ofK0 andK* (892)0 mesons inK+A-interactions (A=Be, Cu, Pb) at the energy 11.2 GeV has been investigated to study hadronisation of the leading$\bar s$-quark; the results are presented. Double differential cross sections d2σ/dxfdpt2 were measured in the region of incident particle fragmentation (0.4≦xf≦1,pt≦0.5 GeV/c). The experimental data obtained were analysed on the basis of the Lund model FRITIOF and a quark-gluon model that takes into account colour screening and hadron formation length effects. The experimental data confirm the picture of hadronisation of the leading$\bar s$-quark developed in the latter model.

6 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.