Investigation of charged-hadron production in proton–nucleus interactions at the energy of 50 GeV

Cross sections for the production of high-transverse-momentum charged hadrons in proton–nucleus interactions at the incident-proton energy of 50 GeV were measured with the aid of the FODS double-arm spectrometer. Single hadrons (charged pions and protons) emitted at a c.m. angle of about 90° and high-effective-mass pairs of hadrons flying apart at a c.m. angle of 180° were detected simultaneously. Results on the production of single hadrons are presented.     

Measurement of Cross Sections for Inclusive Forward Charged Hadron Production in Carbon–Carbon Collisions at Beam Energy of 19.6 GeV per Nucleon

Physics of Atomic Nuclei - The invariant cross sections for forward charged-hadron production at zero angle in carbon–carbon collisions at a beam kinetic energy of 19.6 GeV per nucleon were...     

Longitudinal polarization of direct muons with p⊥ = 1.9 GeV/c produced in NN collisions

The longitudinal polarization of direct muons with 1.9 GeV/c transverse momentum produced by 70 GeV protons on the copper target has been measured to be η = ?0.41 ± 0.17.     

Mass Number Dependence of the Forward Production of Charged Hadrons and Nuclear Fragments in Carbon–Lead and Carbon–Carbon Interaction at a Beam Energy of 19.6 GeV per Nucleon

Physics of Atomic Nuclei - The inclusive differential cross sections for the production of $$\pi^{\pm}$$ and $$k^{-}$$ mesons, protons, and antiprotons with momenta between 6 and 50 GeV/c and...     

Measurement of the analyzing power of high-transverse-momentum charged hadrons in proton-nucleus collisions at an energy of 40 GeV

The transverse single-spin asymmetry was measured for charged hadrons (π ^±, K ^±, p, $\bar p$ ) produced in proton-nucleus collisions. The measurements were performed at the FODS-2 spectrometer by using a polarized proton beam that was accelerated to an energy of 40 GeV at the accelerator of the Institute for High Energy Physics (IHEP, Protvino) and which was made to hit carbon and copper nuclear targets. The data in question were obtained in the range of c.m. angles between 73° and 94° near the central region (?0.01 < x _F < 0.27, 0.7 < p _T < 3.6 GeV/c). The single-spin asymmetry for π ⁺ and K ⁺ mesons is significant at high values of p _T and moderately small positive values of x _F. The analyzing power for other hadrons (π ^?, K ^?, p, $\bar p$ ) is compatible with zero in the p _T range studied here. The dependence of the analyzing power on the mass number of the target nucleus is insignificant.     

Observation of multiparton interactions in proton-nucleus collisions at 70 GeV

The production of noncoplanar hadron pairs in proton-nucleus interactions is studied experimentally for the case where the transverse momenta of product particles are in excess of 1 GeV/c. The values obtained for the exponent in the A dependence of the cross section for the production of noncoplanar hadron pairs are substantially greater than those for coplanar pairs. This nuclear-mass-number dependence for the production of hadron pairs can be explained by the contribution of multiparton interactions in proton-nucleus collisions.