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Properties of hadronic final states in diffractive deep inelastic e p scattering at HERA.

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

Phys.Rev.D 65 (2002) 052001, 2002.

Inspire Record 560352 DOI 10.17182/hepdata.46869

Characteristics of the hadronic final state of diffractive deep inelastic scattering events, ep -> eXp, were studied in the kinematic range 4 < M_X < 35 GeV, 4 < Q^2 < 150 GeV^2, 70 < W < 250 GeV and 0.0003 < x_pom < 0.03 with the ZEUS detector at HERA using an integrated luminosity of 13.8 pb^{-1}. The events were tagged by identifying the diffractively scattered proton using the leading proton spectrometer. The properties of the hadronic final state, X, were studied in its center-of-mass frame using thrust, thrust angle, sphericity, energy flow, transverse energy flow and ``seagull'' distributions. As the invariant mass of the system increases, the final state becomes more collimated, more aligned and more asymmetric in the average transverse momentum with respect to the direction of the virtual photon. Comparisons of the properties of the hadronic final state with predictions from various Monte Carlo model generators suggest that the final state is dominated by qqg states at the parton level.

16 data tables

Table 1

Thrust distribution for a DIS hadronic final state mass between 11 and 17.8GeV.

Table 2

Thrust distribution for a DIS hadronic final state mass between 17.8 and 27.7 GeV.

Table 3

Sphericity distribution for a DIS hadronic final state mass between 11 and 17.8 GeV.

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Coherent inelastic interactions of pi+ and K+ mesons on Al and Au nuclei at 250-GeV/c

The EHS/NA22 collaboration Agababyan, N.M. ; Ataian, M.R. ; Charlet, M. ; et al.

Z.Phys.C 70 (1996) 233-238, 1996.

Inspire Record 404163 DOI 10.17182/hepdata.14346

Cross-sections are obtained for coherent interactions of π+ and K+-mesons with Al and Au nuclei at 250 GeV/c, leading to three, five and seven charged mesons. The total coherent cross-section is (4.3 ± 0.5)% of the inelastic cross-section for each of the four meson-nucleus interactions. In 85% of the coherent events, the charged meson production is accompanied by neutral mesons. Effective mass distributions are presented for coherently produced particles, including charged mesons and photons, carrying total measured energy of more than 85% of the initial energy. Charged particle and γ spectra are analysed. No charge asymmetry is observed within the coherently produced cluster.

5 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Transverse momentum compensation in pi+ p interactions at 250-GeV/c

The EHS/NA22 collaboration Agababyan, N.M. ; Ajinenko, I.V. ; Białkowska, H. ; et al.

Z.Phys.C 64 (1994) 381-390, 1994.

Inspire Record 376919 DOI 10.17182/hepdata.41987

Compensation of transverse momentum is studied in π+p interactions at 250 GeV/c. SignificantpT-transfer is found between c.m.s. hemispheres. With respect to the beam axis transverse momentum is compensated over the whole event, with respect to the sphericity axis mainly within one hemisphere. The highestpT in the event is mainly compensated by increased multiplicity. The QGSM and FRITIOF models qualitatively reproduce these effects, but important differences are observed.

3 data tables

Table 1

Mean value of total transverse VECTOR defined as sum over all charged particles in the forward or backward hemispheres was measured.

Table 2

Mean value of total transverse VECTOR defined as sum over all charged particles in the forward or backward hemispheres was measured.

Table 3

No description provided.

Neutral strange particle production in K+ and pi+ collisions with Al and Au nuclei at 250-GeV/c

The NA22 collaboration Botterweck, F. ; Charlet, M. ; Chliapnikov, P.V. ; et al.

Z.Phys.C 55 (1992) 373-382, 1992.

Inspire Record 333307 DOI 10.17182/hepdata.14584

Data are presented on inclusiveKs0 and Λ production inK+ and π+ collisions with Al and Au nuclei at 250 GeV/c. Results are given on total inclusive cross sections and theA dependence, as well as on distributions in Feynman-xF, rapidityy and transverse momentum. Ratios ofKS0 and of Λ to π+ production are presented. The data are compared with predictions of the quark-parton model FRITIOF.

50 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

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Properties of hadronic final states in diffractive deep inelastic e p scattering at HERA.

Coherent inelastic interactions of pi+ and K+ mesons on Al and Au nuclei at 250-GeV/c

Transverse momentum compensation in pi+ p interactions at 250-GeV/c

Neutral strange particle production in K+ and pi+ collisions with Al and Au nuclei at 250-GeV/c

Central Mg + Mg collisions with Lambda production at a momentum of 4.3-GeV/c per nucleon

Study of Neutral Strange Particle Production in $p p$ Interactions at 32-{GeV}/$c$ and Comparison With $\bar{p} p$ Data

INCLUSIVE PRODUCTION OF gamma QUANTA AND pi0 MESONS IN anti-p p INTERACTIONS AT 32-GeV/c

Fragmentation of Neon-22 Relativistic Nuclei on Photoemulsion Nuclei

STUDY OF INCLUSIVE AND SEMIINCLUSIVE TRANSVERSE MOMENTUM DISTRIBUTIONS OF THE CHARGED HADRONS IN anti-p p INTERACTIONS AT 32-GeV/c

AZIMUTHAL CORRELATIONS BETWEEN SECONDARY CHARGED HADRONS IN K- p INTERACTIONS AT 32-GeV