Spin alignment of K∗(892)±K^*(892)^\pm mesons produced in neutron-carbon interactions

A new precise measurements of spin density matrix element $\rho_{00}$ of $K^*(892)^{\pm}$ mesons produced inclusively in neutron-carbon interactions at \~60 GeV have been carried out in the EXCHARM experiment at the Serpukhov accelerator. The values of $\rho_{00}$ obtained in the transversity frame are $0.424\pm0.011(stat)\pm0.018(sys)$ for $K^*(892)^+$ and $0.393\pm0.025(stat)\pm0.018(sys)$ for $K^*(892)^-$. Significant $P_T$ dependence of $\rho_{00}$ has been observed in $K^*(892)^+$ production.Comment: 8 pages, LaTeX, 3 eps figure

Pion Freeze-Out Time in Pb+Pb Collisions at 158 A GeV/c Studied via pi-/pi+ and K-/K+ Ratios

The effect of the final state Coulomb interaction on particles produced in Pb+Pb collisions at 158 A GeV/c has been investigated in the WA98 experiment through the study of the pi-/pi+ and K-/K+ ratios measured as a function of transverse mass. While the ratio for kaons shows no significant transverse mass dependence, the pi-/pi+ ratio is enhanced at small transverse mass values with an enhancement that increases with centrality. A silicon pad detector located near the target is used to estimate the contribution of hyperon decays to the pi-/pi+ ratio. The comparison of results with predictions of the RQMD model in which the Coulomb interaction has been incorporated allows to place constraints on the time of the pion freeze-out.Comment: 9 pages, 12 figure

Determining Deflections of the Vertical in the Western Siberia Region: The Results of Comparison

At present, information on deflections of the vertical (DOV) is obtained by means of modern global geopotential models. The authors have derived DOV model values in the Western Siberia region. The results of the comparison of the DOV model values calculated with the use of the global geopotential model EIGEN-6C4 and the astrogeodetic measurements taken in the Western Siberia region are analyzed. The study has shown that in plains, standard deviations of DOV model values from the terrestrial data obtained by traditional astrogeodetic method do not exceed 1 arcsec. © 2018, Pleiades Publishing, Ltd

Determining Deflections of the Vertical in the Western Siberia Region: The Results of Comparison

At present, information on deflections of the vertical (DOV) is obtained by means of modern global geopotential models. The authors have derived DOV model values in the Western Siberia region. The results of the comparison of the DOV model values calculated with the use of the global geopotential model EIGEN-6C4 and the astrogeodetic measurements taken in the Western Siberia region are analyzed. The study has shown that in plains, standard deviations of DOV model values from the terrestrial data obtained by traditional astrogeodetic method do not exceed 1 arcsec. © 2018, Pleiades Publishing, Ltd