Forward production of charged pions with incident protons on nuclear targets at the CERN PS

The HARP collaboration Apollonio, M. ; Artamonov, A. ; Bagulya, A. ; et al.
Phys.Rev.C 80 (2009) 035208, 2009.
Inspire Record 826544 DOI 10.17182/hepdata.53810

Measurements of the double-differential charged pion production cross-section in the range of momentum 0.5 GeV/c < p < 8.0 GeV/c and angle 0.025 rad < theta <0.25 rad in collisions of protons on beryllium, carbon, nitrogen, oxygen, aluminium, copper, tin, tantalum and lead are presented. The data were taken with the large acceptance HARP detector in the T9 beam line of the CERN PS. Incident particles were identified by an elaborate system of beam detectors. The data were taken with thin targets of 5% of a nuclear interaction length. The tracking and identification of the produced particles was performed using the forward system of the HARP experiment. Results are obtained for the double-differential cross section mainly at four incident proton beam momenta (3 GeV/c, 5 GeV/c, 8 GeV/c and 12 GeV/c). Measurements are compared with the GEANT4 and MARS Monte Carlo generators. A global parametrization is provided as an approximation of all the collected datasets which can serve as a tool for quick yields estimates.

91 data tables

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Excitation of the Delta (1232) resonance in proton - nucleus collisions

Trzaska, M. ; Pelte, D. ; Lemaire, M. -C. ; et al.
Z.Phys.A 340 (1991) 325-331, 1991.
Inspire Record 314551 DOI 10.17182/hepdata.15689

The excitation of theΔ resonance is observed in proton collisions on C, Nb and Pb targets at 0.8 and 1.6 GeV incident energies. The mass E0 and widthΓ of the resonance are determined from the invariant mass spectra of correlated (p, π±)-pairs in the final state of the collision: The mass E0 is smaller than that of the free resonance, however by comparing to intra-nuclear cascade calculations, this reduction is traced back to the effects of Fermi motion, NN scattering and pion reabsorption in nuclear matter.

22 data tables

WITHIN THE DETECTORS ACCEPTANCE RESULTS.

WITHIN THE DETECTORS ACCEPTANCE RESULTS.

WITHIN THE DETECTORS ACCEPTANCE RESULTS.

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Comparison of large-angle production of charged pions with incident protons on cylindrical long and short targets

The HARP collaboration Apollonio, M. ; Artamonov, A. ; Bagulya, A. ; et al.
Phys.Rev.C 80 (2009) 065204, 2009.
Inspire Record 830148 DOI 10.17182/hepdata.54193

The HARP collaboration has presented measurements of the double-differential pi+/pi- production cross-section in the range of momentum 100 MeV/c <= p 800 MeV/c and angle 0.35 rad <= theta <= 2.15 rad with proton beams hitting thin nuclear targets. In many applications the extrapolation to long targets is necessary. In this paper the analysis of data taken with long (one interaction length) solid cylindrical targets made of carbon, tantalum and lead is presented. The data were taken with the large acceptance HARP detector in the T9 beam line of the CERN PS. The secondary pions were produced by beams of protons with momenta 5 GeV/c, 8 GeV/c and 12 GeV/c. The tracking and identification of the produced particles were performed using a small-radius cylindrical time projection chamber (TPC) placed inside a solenoidal magnet. Incident protons were identified by an elaborate system of beam detectors. Results are obtained for the double-differential yields per target nucleon d2 sigma / dp dtheta. The measurements are compared with predictions of the MARS and GEANT4 Monte Carlo simulations.

54 data tables

Differential cross section for PI+ production with a C target in the angular range 0.35 to 0.55 radians.. The errors are the square root of the diagonal elements of the covariant matrix.

Differential cross section for PI+ production with a C target in the angular range 0.55 to 0.75 radians.. The errors are the square root of the diagonal elements of the covariant matrix.

Differential cross section for PI+ production with a C target in the angular range 0.75 to 0.95 radians.. The errors are the square root of the diagonal elements of the covariant matrix.

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Forward pi+/- production in p-O2 and p-N2 interactions at 12 GeV/c

The HARP collaboration Catanesi, M.G. ; Radicioni, E. ; Edgecock, R. ; et al.
Astropart.Phys. 30 (2008) 124-132, 2008.
Inspire Record 790079 DOI 10.17182/hepdata.50531

Measurements of double-differential charged pion production cross-sections in interactions of 12 GeV/c protons on O_2 and N_2 thin targets are presented in the kinematic range 0.5 GeV/c &lt; p_{\pi} &lt; 8 GeV/c and 50 mrad &lt; \theta_{\pi} &lt; 250 mrad (in the laboratory frame) and are compared with p--C results. For p--N_2 (p--O_2) interactions the analysis is performed using 38576 (7522) reconstructed secondary pions. The analysis uses the beam instrumentation and the forward spectrometer of the HARP experiment at CERN PS. The measured cross-sections have a direct impact on the precise calculation of atmospheric neutrino fluxes and on the improved reliability of extensive air shower simulations by reducing the uncertainties of hadronic interaction models in the low energy range. In particular, the present results allow the common hypothesis that p--C data can be used to predict the p--N_2 and p--O_2 pion production cross-sections to be tested.

12 data tables

Double differential cross section for pion production in P-N2 interactions for the pion scattered polar angle range 50 to 100 mrad.

Double differential cross section for pion production in P-N2 interactions for the pion scattered polar angle range 100 to 150 mrad.

Double differential cross section for pion production in P-N2 interactions for the pion scattered polar angle range 150 to 200 mrad.

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Measurement of the production cross-sections of $\pi^\pm$ in p-C and $\pi^\pm$-C interactions at 12 GeV/c

The HARP collaboration Catanesi, M.G. ; Radicioni, E. ; Edgecock, R. ; et al.
Astropart.Phys. 29 (2008) 257-281, 2008.
Inspire Record 778842 DOI 10.17182/hepdata.50415

The results of the measurements of the double-differential production cross-sections of pions in p-C and $\pi^\pm$-C interactions using the forward spectrometer of the HARP experiment are presented. The incident particles are 12 GeV/c protons and charged pions directed onto a carbon target with a thickness of 5% of a nuclear interaction length. For p-C interactions the analysis is performed using 100035 reconstructed secondary tracks, while the corresponding numbers of tracks for $\pi^-$-C and $\pi^+$-C analyses are 106534 and 10122 respectively. Cross-section results are presented in the kinematic range 0.5 GeV/c $\leq p_{\pi} &lt;$ 8 GeV/c and 30 mrad $\leq \theta_{\pi} &lt;$ 240 mrad in the laboratory frame. The measured cross-sections have a direct impact on the precise calculation of atmospheric neutrino fluxes and on the improved reliability of extensive air shower simulations by reducing the uncertainties of hadronic interaction models in the low energy range.

19 data tables

Double-differential cross section for 12 GeV proton-carbon interactions with the scattered polar angle 30 to 60 mrad.

Double-differential cross section for 12 GeV proton-carbon interactions with the scattered polar angle 60 to 90 mrad.

Double-differential cross section for 12 GeV proton-carbon interactions with the scattered polar angle 90 to 120 mrad.

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Large-angle production of charged pions with 3-12.9 GeV/c incident protons on nuclear targets

The HARP collaboration Catanesi, M.G. ; Radicioni, E. ; Edgecock, R. ; et al.
Phys.Rev.C 77 (2008) 055207, 2008.
Inspire Record 786183 DOI 10.17182/hepdata.13425

Measurements of the double-differential charged pion production cross-section in the range of momentum 100 MeV/c &lt; p &lt; 800 MeV/c and angle 0.35 &lt; \theta &lt; 2.15 rad in proton-beryllium, proton-carbon, proton-aluminium, proton-copper, proton-tin, proton-tantalum and proton-lead collisions are presented. The data were taken with the large acceptance HARP detector in the T9 beam line of the CERN PS. The pions were produced by proton beams in a momentum range from 3 GeV/c to 12.9 GeV/c hitting a target with a thickness of 5% of a nuclear interaction length.

37 data tables

Double-differential cross section for inclusive PI+ production in the LAB system with the BE target for a PI+ polar angle from 0.35 to 0.55 radians.

Double-differential cross section for inclusive PI+ production in the LAB system with the BE target for a PI+ polar angle from 0.55 to 0.75 radians.

Double-differential cross section for inclusive PI+ production in the LAB system with the BE target for a PI+ polar angle from 0.75 to 0.95 radians.

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Large-angle production of charged pions by 3 GeV/c - 12 GeV/c protons on carbon, copper and tin targets

The HARP collaboration Catanesi, M.G. ; Edgecock, R. ; Ellis, Malcolm ; et al.
Eur.Phys.J.C 53 (2008) 177-204, 2008.
Inspire Record 761546 DOI 10.17182/hepdata.51401

A measurement of the double-differential $\pi^{\pm}$ production cross-section in proton--carbon, proton--copper and proton--tin collisions in the range of pion momentum $100 \MeVc \leq p &lt; 800 \MeVc$ and angle $0.35 \rad \le \theta &lt;2.15 \rad$ is presented. The data were taken with the HARP detector in the T9 beam line of the CERN PS. The pions were produced by proton beams in a momentum range from 3 \GeVc to 12 \GeVc hitting a target with a thickness of 5% of a nuclear interaction length. The tracking and identification of the produced particles was done using a small-radius cylindrical time projection chamber (TPC) placed in a solenoidal magnet. An elaborate system of detectors in the beam line ensured the identification of the incident particles. Results are shown for the double-differential cross-sections at four incident proton beam momenta (3 \GeVc, 5 \GeVc, 8 \GeVc and 12 \GeVc).

54 data tables

Double-differential cross section for PI+ production from C in the LAB system for PI+ polar angle from 0.35 to 0.55 radians.

Double-differential cross section for PI+ production from C in the LAB system for PI+ polar angle from 0.55 to 0.75 radians.

Double-differential cross section for PI+ production from C in the LAB system for PI+ polar angle from 0.75 to 0.95 radians.

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