Forward produced hadrons in mu p and mu d scattering and investigation of the charge structure of the nucleon

The European Muon collaboration Ashman, J. ; Badelek, B. ; Baum, G. ; et al.
Z.Phys.C 52 (1991) 361-388, 1991.
Inspire Record 314883 DOI 10.17182/hepdata.1432

Final data measured with the EMC forward spectrometer are presented on the production of forward charged hadrons in μp and μd scattering at incident beam energies between 100 and 280 GeV. The large statistic of 373 000 events allows a study of the semi-inclusive hadron production as a function ofz,pT2 and 〈pT2〉 in smallQ2,xBj andW bins. Charge multiplicity ratios and differences as a function ofz andxBj are given forp, d andn-targets. From the differences of charge multiplicities the ratio of the valence quark distributions of the protondv(x)/uv(x) is determined for the first time in charged lepton scattering. The Gronau et al. sum rule is tested, the measured sum being 0.31±0.06 stat. ±0.05 syst., compared with the theoretical expectation of 2/7≈0.286. The measured sum corresponds to an absolute value of the ratio of thed andu quark charge of 0.44±0.10 stat.±0.08 syst.

129 data tables

No description provided.

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Properties of $J / \psi$ Production in $\pi^-$ Be and p Be Collisions at 530 GeV/c

The E672/706 collaboration Abramov, V. ; Antipov, Yu. ; Baldin, B. ; et al.
FERMILAB-PUB-91-062-E, 1991.
Inspire Record 315071 DOI 10.17182/hepdata.42566

None

2 data tables

Data is extrapolated to full x range.

Data requested from authors.


Direct Photon Production at High $p_T$ in $\pi^-$Be and pBe Collisions at 500 GeV/c

Alverson, G. ; Baker, W.F. ; Ballocchi, G. ; et al.
Phys.Rev.Lett. 68 (1992) 2584-2587, 1992.
Inspire Record 318739 DOI 10.17182/hepdata.19865

We report new measurements of inclusive direct photon production at high transverse momenta (pT) for π− and p interactions on Be at 500 GeV/c. The yields as a function of pT and rapidity (y) are in good agreement with expectations from next-to-leading-log QCD calculations employing recently extracted quark and gluon structure functions.

1 data table

No description provided.


Production of $\pi^0$ Mesons at high $p_T$ in $\pi^-$Be and pBe Collisions at 500 GeV/c

Alverson, G. ; Baker, W.F. ; Ballocchi, G. ; et al.
Phys.Rev.D 45 (1992) R3899-R3902, 1992.
Inspire Record 318740 DOI 10.17182/hepdata.22751

We present new measurements of π0 production at high transverse momenta (pT) for π− and p interactions on Be and Cu targets at 500 GeV/c. The observed dependence of the yields as a function of pT and rapidity (y) is compared with expectations from leading-log QCD over a kinematic range in which the inclusive cross sections fall by more than 4 order of magnitude.

2 data tables

No description provided.

A dependence parameterized as A**POWER for both Pi- and P interactions.


Muoproduction of J / psi and the gluon distribution of the nucleon

The European Muon collaboration Ashman, J. ; Badelek, B. ; Baum, G. ; et al.
Z.Phys.C 56 (1992) 21-28, 1991.
Inspire Record 336767 DOI 10.17182/hepdata.14559

Measurements are presented of the inclusive distributions of theJ/Ψ meson produced by muons of energy 200 GeV from an ammonia target. The gluon distribution of the nucleon has been derived from the data in the range 0.04

7 data tables

Data are normalized to total cross section of 36 nb (not corrected for coherence).

Data are normalized to total cross section of 36 nb (not corrected for coherence).

Data are normalized to total cross section of 36 nb (not corrected for coherence).

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A Measurement of the ratio of the nucleon structure function in copper and deuterium

The European Muon collaboration Ashman, J. ; Badelek, B. ; Baum, G. ; et al.
Z.Phys.C 57 (1993) 211-218, 1993.
Inspire Record 341575 DOI 10.17182/hepdata.14499

Results are presented on the ratios of the nucleon structure function in copper to deuterium from two separate experiments. The data confirm that the nucleon structure function,F2, is different for bound nucleons than for the quasi-free ones in the deuteron. The redistribution in the fraction of the nucleon's momentum carried by quarks is investigated and it is found that the data are compatible with no integral loss of quark momenta due to nuclear effects.

3 data tables

Results from the 'chariot' experiment.

Results from the 'addendum' experiment.

Merged 'chariot' and 'addendum' ratio.. Errors are combined statistics and systematics.


Production of direct photons and neutral mesons at large transverse momenta by pi- and p beams at 500-GeV/c

The FERMILAB-E706 collaboration Alverson, G. ; Baker, W.F. ; Ballocchi, G. ; et al.
Phys.Rev.D 48 (1993) 5-28, 1993.
Inspire Record 353153 DOI 10.17182/hepdata.22583

We present results from the initial run of Fermilab experiment E706. The data include incident π− and p beams at 500 GeV/c on Be and Cu targets, and span the kinematic ranges of transverse momentum and rapidity of 3.5≤pT≤10 GeV/c and −0.7≤yc.m.≤0.7, respectively. We have measured cross sections for π0 and direct-photon production, as well as the ηπ0 production ratio. From the data on Be and Cu, we have extracted the nuclear dependence of π0 production, parametrized as Aα. The cross sections are compared with next-to-leading-log QCD predictions for different choices of the QCD momentum scales and several sets of parton distribution functions.

10 data tables

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Measurements of polarized-neutron-polarized-proton scattering: Implications for the triton binding energy

Wilburn, W.S. ; Gould, C.R. ; Haase, D.G. ; et al.
Phys.Rev.Lett. 71 (1993) 1982-1985, 1993.
Inspire Record 370854 DOI 10.17182/hepdata.19731

Measurements have been made of ΔσT for polarized neutrons incident on a polarized-proton target from 3.65 to 11.60 MeV. In the energy range near 10 MeV, ΔσT is very sensitive to the nucleon-nucleon tensor interaction. Comparison of the data to potential-model predictions indicate that the tensor interaction is weak, resulting in values of the 3S1−3D1 mixing parameter ε1 which are smaller than predicted by any nucleon-nucleon potential model. A smaller tensor force will bring the predictions of local potential models for the triton binding energy into closer agreement with the experimental value.

1 data table

The measured cross section is the total cross section with the spins antiparallel minus the total cross section with the spins parallel.


Inclusive charged pion production in hadron nucleus interactions at 100-GeV/c and 320-GeV/c

Whitmore, J.J. ; Persi, F. ; Toothacker, W.S. ; et al.
Z.Phys.C 62 (1994) 199-227, 1994.
Inspire Record 378192 DOI 10.17182/hepdata.14207

An experiment has been performed with the Fermilab 30-inch bubble chamber and Downstream Particle Identifier to study inclusive charged pion production in the high energy interactions of π±,K+,p and\(\bar p\) with thin foils of magnesium, silver and gold. The laboratory rapidity and transverse momentum distributions are presented separately for π+ and π− production. Comparisons are made with data from hadron-proton interactions and theA dependence of the cross sections in the different kinematic regions is discussed. We investigate the dependence of the cross sections on the number of observed protons ejected from the nucleus. By using our π−A data from two different beam energies, we study the energy dependence of these spectra. Comparisons are made with the VENUS string model Monte Carlo.

40 data tables

No description provided.

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Bottom production in pi- - Be collisions at 515-GeV/c

The E672/E706 collaboration Jesik, R. ; Abramov, V. ; Antipov, Yu. ; et al.
Phys.Rev.Lett. 74 (1995) 495-498, 1995.
Inspire Record 374151 DOI 10.17182/hepdata.42447

We report on a sample of Jψ mesons coming from secondary vertices, a characteristic of heavyquark decay, detected in the Fermilab Meson West spectrometer. Based on eight signal events in which a Jψ emerges from a secondary vertex occurring in an air-gap region, we obtain an inclusive bb¯ cross section of 75 ± 31 ± 26 nb/nucleon. This result is compared to recent QCD predictions. We have also observed several events in the exclusive decay modes B±→Jψ+K± and B0→Jψ+K0* in which the B mass is fully reconstructed.

2 data tables

The cross section is multiplied on Br(J/PSI --> MU+ MU-).

No description provided.