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

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

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

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

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MOMENTUM AND ANGULAR DISTRIBUTIONS OF pi- MESONS PRODUCED IN d C INTERACTIONS AT 1-GeV/N

Viryasov, N.M. ; Grigorian, V.A. ; Gulkanian, G.R. ; et al.
JINR-P1-89-511, 1989.
Inspire Record 285509 DOI 10.17182/hepdata.38758

None

4 data tables

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(1/N)*D(N)/D(P) HAS BEEN FITTED BY (P/MEAN(N=P))**POWER* EXP(-SLOPE*SQRT(P/MEAN(N=P))).

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Multiplicities of secondaries in interactions of 1.8-GeV/nucleon Fe-56 nuclei with photoemulsion and the cascade evaporation model

Dudkin, V.E. ; Kovalev, E.E. ; Nefedov, N.A. ; et al.
Nucl.Phys.A 509 (1990) 783-799, 1990.
Inspire Record 302290 DOI 10.17182/hepdata.36888

A nuclear photographic emulsion method was used to study the charge-state, ionization, and angular characteristics of secondaries produced in inelastic interactions of 56 Fe nuclei at 1.8 GeV/nucleon with H, CNO, and AgBr nuclei. The data obtained are compared with the results of calculations made in terms of the Dubna version of the cascade evaporation model (DCM). The DCM has been shown to satisfactorily describe most of the interaction characteristics for two nuclei in the studied reactions. At the same time, quantitative differences are observed in some cases.

16 data tables

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NUCLECS IS CNO.

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