V. B. Vinogradov

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.

Measurement of the Dalitz plot slope parameters for K+→ π+π0π0 decay

We have measured the Dalitz plot slope parameters for the K+ → π+π0π0 decay with an accuracy higher than in previous experiments. The values obtained are substantially different from the world averages. The experiment was performed at the Serpukhov PS with the HYPERON-2 spectrometer at the beam energy 10 GeV We have collected about 33000 events with energies and momenta measured for all involved particles.

Analytical representation of the longitudinal hadronic shower development

Abstract The analytical representation of the longitudinal hadronic shower development from the face of a calorimeter is presented and compared with the experimental data. The suggested formula is particularly useful for designing, testing and calibrating a huge calorimeter complex like in ATLAS at LHC.

Measurement of the decay probability KL → 2πo

Abstract Using the 180-liter ITEP liquid xenon bubble chamber we have measured the branching ratio Γ (K L → 2 π o )/ Γ (K L → 3 π o ) to be (3.7 ± 0.8) × 10 −3 . We find | η oo | to be (2.02 ± 0.23) × 10 −3 .

On the 1350 MeV Λγ peak produced in π− p interaction

Abstract The existence of the Λγ peak between 1300 and 1400 MeV was supported by our measurements. The explanation of this peak by means of the hypothetical Λη (1680 MeV) resonance can be rejected with a 97% confidence level.

A new upper limit for the branching ratio of the decay K0S → e+e−

Abstract A new value of the upper limit for the branching ratio of the decay of K 0 S into e + e − has been experimentally obtained using a lead glass detector. The value is BR (K 0 S → e + e − ) −4 (90% CL).

On the parameterization of the longitudinal hadronic shower profiles in combined calorimetry

Abstract The extension of the longitudinal hadronic shower profile parameterization which takes into account non-compensations of calorimeters and the algorithm of the longitudinal hadronic shower profile curve making for a combined calorimeter are suggested. The proposed algorithms can be used for data analysis from modern combined calorimeters like the ATLAS detector at the LHC.

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|

Innovative energy reconstruction algorithm for a hadron calorimeter

We suggest a new non-parametrical hadron energy reconstruction algorithm for a combined calorimeter. It uses only the known values of non-compensation (e/h ratios) and the electron calibration constants of the electromagnetic and hadronic compartments of a calorimeter. We demonstrate its performance using the experimental data of the ATLAS prototype combined calorimeter.