Skobeltsyn Institute of Nuclear Physics
Lomonosov Moscow State University

It is shown how the geometrical splitting of N-point Feynman diagrams can be used to
simplify the parametric integrals and reduce the number of variables in the occurring functions. As
an example, a calculation of the dimensionally-regulated one-loop four-point function in general
kinematics is presented.

Document number: 2017-1/891

Authors: Andrei I. Davydychev

This work describes the design and results of the calculation of electron source with high
brightness beam, which generate a sequence of 4 bunches of charge 1 nC each following with
repetition rate 50 Hz. RMS normalized transverse emittance of the bunch does not exceed 4 mm mrad,
rms duration of 3 ps, beam energy is adjustable in the range 35-50 MeV.

Document number: 2016-1/889

Authors: I.Yu. Vladimirov, B.S. Ishkhanov, L.Yu. Ovchinnikova, V.I. Shvedunov, D.S. Yurov

The appearance of the radion field and of the radion, the corresponding lowest Kaluza-Klein (KK) mode, is a generic prediction of stabilized brane world models. In such models the radion plays the role of the dilaton, and its mass may be somewhat smaller than that of all the KK modes of other particles propagating in the multidimensional bulk. Due to its origin, the radion couples to the trace of the energy-momentum tensor of the Standard Model, the interaction Lagrangian of the radion and the Standard Model fermions being similar to that of the SM Higgs-fermion interactions except for additional terms, which come into play only in the case of off-shell fermions. In the present paper it is shown that all the contributions due to these additional terms to perturbative amplitudes of physical processes with emitted single radion and an arbitrary number of gauge bosons are canceled out for both massless and massive off-shell fermions. Thus in this case the additional fermion-radion terms in the interaction Lagrangian do not alter any production and decay properties of the radion compared to those of the Higgs boson.

Document number: 2014-2/886

Authors: E. Boos, S. Keizerov, E. Rahmetov, K. Svirina

$\Sigma^-$ hyperon component of the $^{10}_\Lambda$Li wave function is studied. The

$\Sigma^-$ admixture is vital for production of neutron-rich $\Lambda$ hypernuclei via

mesonic beams. We use a simplified shell model wave function for the $\Lambda$ channel

and calculate the $\Sigma^-$ admixture directly from coupled equations. Probability of the

$\Sigma^-$ admixture for realistic repulsive $\Sigma^-$-nucleus potentials is less by several

times than that for attractive potentials and does not exceed 0.1\%. We conclude that the

cross sections of the $^{10}\mbox{B}(\pi^-,K^+){}^{10}_\Lambda\mbox{Li}$ reaction

measured at KEK cannot be explained by production via $\Sigma^-$ admixture as a doorway

state.

Document number: 2014-1/885

Authors: D.E.Lanskoy, A.Sinyakova

RESTful-web services for remote access to data storage resources for distributed systems in
the Earth sciences are presented.

Document number: 2012-4/882

Authors: A.P.Kryukov, M.N.Zhizhin, FA.A.Poyda, D.Yu.Mishin, D.P.Medvedev, A.P.Demichev, D.S.Kokovin

The paper describes a software package designed to simulate an experiment to study
photonucleon reactions by measuring the residual activity.

Document number: 2012-3/881

Authors: B.S. Ishkhanov, S.Y. Troschiev

This work presents a compilation, systematic and analysis of experimental data on equilibrium and preequilibrium charge fractions and mean charges of ions, passing through gaseous media and thin foils

Document number: 2011-14/878

Authors: Yu.A.Belkova, Ya.A.Teplova

Different factors having effect on the structure of the ground and low energy states of Cd, Sn and Te isotopes were investigated.

Document number: 2012-2/880

Authors: B.S. Ishkhanov, A.A. Kostyukov

The article presents a hierarchical approach for the predicting of high-speed quasistationary solar wind streams.

Document number: 2011-10/874

Authors: Yu. S. Shugay, I. S. Veselovsky, D. B. Seaton, D. Berghmans