[en] The Shashlyk calorimeter prototype for the PANDA experiment has been constructed at IHEP and experimentally tested using the 1-19 GeV electron beam with high precision momentum tagging at the IHEP accelerator. Results of the first measurements for the fine-segmented Shashlyk calorimeter prototype in the wide energy range up to 19 GeV are presented. Fair energy and position resolutions having been obtained are in a good agreement with the Monte-Carlo simulations. Detection inefficiency due to holes for straight light fibers has turned out to be negligible for PANDA. Plans for the near term future including approaching test beam study of π⁰ reconstruction capability of shashlyk prototype are also discussed.

[en] A new single-spin asymmetry A_N measurement has been carried out at IHEP at 50 GeV. A_N was found to be -(6.2±1.5)% in the polarized target fragmentation region at -0.6< x_F<-0.25. The result proves that asymmetry does not depend on beam energy. A review of polarization results from Protvino as well as a proposal of the new experiment SPASCHARM are also presented.

[en] The single-spin asymmetry A_N in the reaction π^- + d_↑^→ π⁰ + X in the beam-fragmentation region at the energy of 40 GeV was investigated by using the PROZA setup installed at the U-70 accelerator of the Institute for High Energy Physics (IHEP, Protvino). It was measured to be A_N = (13.6 ± 2.6(stat.) ± 2.0(syst.))% in the intervals 0.7 < x_F < 1.0 and 1.0 < p_T < 1.8 GeV/c. The results agree with the asymmetry of π⁰ mesons in the charge-exchange reaction π^- + p_↑^→ π⁰ + n at the same values of the transverse momentum and beam energy. The asymmetry in the reaction K^- + d_↑^→ π⁰ + X was simultaneously measured and found to be A_N = (11 ± 14)% for p_T > 1.2 GeV/c.

[en] A new experiment SPASCHARM for systematic study of polarization phenomena in inclusive and exclusive hadronic reactions is currently under commissioning at IHEP. The universal experimental setup will detect dozens of various resonances and stable particles produced in collisions of unpolarized beams with the polarized target, and at the next stage, using polarized beams. At the first stage with polarized target, the final states composed of light quarks (u, d, s) will be reconstructed. Hyperon polarization and spin density matrix elements of the vector mesons will be measured along with the single-spin asymmetries. The 2π-acceptance in azimuth, which is extremely useful for reduction of systematic errors in measurements of spin observables, will be implemented in the experiment. The solid angle acceptance of the setup, Δθ≈250 mrad vertically and 350 mrad horizontally in the beam fragmentation region, covers a wide range of kinematic variables p_T and x_F. This provides the opportunity for separating dependences on these two variables which is usually not possible in the setups with a small solid angle acceptance. Unlike some previous polarization experiments, the SPASCHARM will be able to simultaneously accumulate and record data on the both, charged and neutral particle production. (paper)

[en] The new SPASCHARM experiment for systematic studies of polarization phenomena in strong interactions is under construction now at IHEP, Protvino. The technical beam runs for the experiment first stage are planned for the Fall 2016 and Spring 2017. At this stage, the polarization measurements will be carried out with unpolarized hadronic beams of various compositions ( π ^±, K^±, p, antiprotons), using the polarized target. The universal large acceptance experimental set-up is capable detecting and identification most charged and neutral particles and reconstructing a large number of resonances produced in beam interactions at polarized proton target, and later on at the second stage, in collisions of polarized proton and antiproton beams with fixed targets of various materials. The large acceptance and wide data acquisition bandwidth would provide the capabilities for simultaneous data accumulation for a number of physics analyses from the measurements of single-spin asymmetries in inclusive and exclusive reactions to reconstructions of final state hyperon polarizations and spin density matrix elements for vector mesons in a wide range of kinematic variables (p_T, x_F). (paper)