G.S. Bitsadze

Measurements of the K+→π0e+ν form factors

Abstract The q2 dependence of the vector form factor has been investigated using 3.2 × 104 K+ → π0e+ν decays. The usual linear parametrization. ƒ + (q 2 ) = ƒ(0)(1+λ + q 2 /m π 0 0 ) gives λ+ = 0.0284±0.0027. An analysis of the Dalitz plot density distribution for Ke3+ decays yields the values for the scalar and tensor couplings ƒs and ƒt, and their relative phase angle ost.

Reconstruction of the coordinate and energy of the electromagnetic shower in the lead-glass hodoscope calorimeter at different entrance angles of 5 GeV positrons

Abstract Energy deposition as a function of entrance angles and coordinates for 5 GeV e + is studied experimentally in 10×10×35 cm 3 blocks of the lead-glass shower hodoscope detector (SHD); the radiation length is X 0 = 2.5 cm. A method for the reconstruction of electromagnetic shower coordinates ( σ ⋍ 11 mm ) and energies ( σ E /E ⋍ 6% ) is developed for the positron entrance angles 0°–30°.

Characteristics of hadronic showers detected by Cherenkov radiation in lead glass

Abstract Spatial and energy characteristics of hadron showers were studied for the first time with the help of a total hadron absorption detector made from lead glass. The calorimeter model having a longitudinal and transverse hodoscopic structure with 10 cm step width is exposed to a particle beam of e + , μ + , π + , K + , p at 5, 10 and 13 GeV/ c . Data on the energy and coordinate resolution, hadron and electromagnetic shower separation have been obtained.

A-dependence of η-meson inclusive production at 10.5 GeV/c

Abstract The experimental results are presented for ratios of ν-meson inclusive differential cross sections in 10.5 GeV/c π+p, π+D and π+A collisions, RD/p=(dσ/dxF)(π+D→ηX)/ (dσ/dxF)π+p→ηX), RA=(dσ/dxF)(π+D→ηX) in the beam fragmentation region. The results are based on the statistics of ≈ 5 × 104 detected η → 2γ decays. It is shown that the power α in the parametrisation RA ≈ Aα(xf) does not change significantly with xF and its mean value is 0.50±0.02. The lower limit is obtained for the effective coefficient with string tension in the colour string model, κ ⩾ 3 GeV/fm. The observed growth of RA with xF can be explained by an assumption of a neutron halo with the factor H ≈ 4 in the nuclei.

Study of the hypercharge exchange reactions π+p→K+∑+ and π+p→K+∑+(1385) at 12 GeV/c

Abstract The results of the study of the π+p→K+∑+ (1) and π+p→K+∑+(1385) (2) reactions at 12 GeV/c are presented. The differential cross sections dσ/dt in|tmin|

Investigation of inclusive production ofK0 andK* (892)0 mesons inK+A interactions at 11.2 GeV

AbstractInclusive production ofK0 andK* (892)0 mesons inK+A-interactions (A=Be, Cu, Pb) at the energy 11.2 GeV has been investigated to study hadronisation of the leading

Study of inclusive K0(s) meson production in pi+ A and K+ A interactions at 11.2-GeV

\bar s

K^0

-quark; the results are presented. Double differential cross sections d2σ/dxfdpt2 were measured in the region of incident particle fragmentation (0.4≦xf≦1,pt≦0.5 GeV/c). The experimental data obtained were analysed on the basis of the Lund model FRITIOF and a quark-gluon model that takes into account colour screening and hadron formation length effects. The experimental data confirm the picture of hadronisation of the leading