Jafar, J.D.
DSIG/DETARAP
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Differential cross sections of D*-+ photoproduction in e p collisions at HERA.

The ZEUS collaboration Breitweg, J. ; Derrick, M. ; Krakauer, D. ; et al.
Phys.Lett.B 401 (1997) 192-206, 1997.
Inspire Record 441088 DOI 10.17182/hepdata.44632

Inclusive photoproduction of $\dspm$ in ep collisions at HERA has been measured with the ZEUS detector for photon-proton centre of mass energies in the range \linebreak \wrang and photon virtuality Q~2 < 4 \g2. The cross section $\sigma_{ep \to \ds X} $ integrated over the kinematic region \ptrangand \etarang is {\xsecs}. Differential cross sections as functions of $p_{\perp}~{\ds}$, $\eta~{\ds}$ and W are given. The data are compared with two next-to-leading order perturbative QCD predictions. For a calculation using a massive charm scheme the predicted cross sections are smaller than the measured ones. A recent calculation using a massless charm scheme is in agreement with the data.

6 data tables
Table 1

Data from the (Kpi)pi channel.

Table 2

Data from the (Kpipipi)pi channel.

Table 3

Data from the (Kpi)pi channel.

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rivet Analysis
Measurement of charged particle transverse momentum spectra in deep inelastic scattering.

The H1 collaboration Adloff, C. ; Aid, S. ; Anderson, M. ; et al.
Nucl.Phys.B 485 (1997) 3-24, 1997.
Inspire Record 424463 DOI 10.17182/hepdata.44710

Transverse momentum spectra of charged particles produced in deep inelastic scattering are measured as a function of the kinematic variables x_B and Q2 using the H1 detector at the ep collider HERA. The data are compared to different parton emission models, either with or without ordering of the emissions in transverse momentum. The data provide evidence for a relatively large amount of parton radiation between the current and the remnant systems.

48 data tables
Table 1

Charged particle PT distribution in the pseudorapidity interval 1.5 to 2.5.

Table 2

Charged particle PT distribution in the pseudorapidity interval 1.5 to 2.5.

Table 3

Charged particle PT distribution in the pseudorapidity interval 1.5 to 2.5.

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Inclusive parton cross-sections in photoproduction and photon structure

The H1 collaboration Ahmed, T. ; Aid, S. ; Andreev, V. ; et al.
Nucl.Phys.B 445 (1995) 195-218, 1995.
Inspire Record 394176 DOI 10.17182/hepdata.44975

Photoproduction of 2-jet events is studied with the H1 detector at HERA. Parton cross sections are extracted from the data by an unfolding method using leading order parton-jet correlations of a QCD generator. The gluon distribution in the photon is derived in the fractional momentum range $0.04\le x_\gamma \le 1$ at the average factorization scale $75$ GeV$~2$.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

Gluon density of the photon (alpha is the fine structure constant).


Inclusive charged particle cross-sections in photoproduction at HERA

The H1 collaboration Abt, I. ; Ahmed, T. ; Andreev, V. ; et al.
Phys.Lett.B 328 (1994) 176-186, 1994.
Inspire Record 372256 DOI 10.17182/hepdata.45105

Cross sections are presented for the inclusive production of charged particles measured in electron-proton collisions at low Q 2 with the H1 detector at HERA. The transverse momentum distribution extends up to 8 GeV/ c . Its shape is found to be harder than that observed in p p collisions at comparable centre-of-mass energies √S γp ≈ √S p p ≈ 200 GeV , and also harder than in γp collisions at lower energies √ S γp ≈ 18 GeV. Results from quantum chromodynamics (QCD) calculations agree with the measured transverse momentum and pseudorapidity cross sections.

2 data tables
Table 1

No description provided.

Table 2

No description provided.