Physics of Particles and Nuclei Letters最新文献

A possibility to reduce the problem of building an integrable supersymmetric extension of a given integrable model with (n) degrees of freedom to finding (n) vectors, all scalar products of which link to (n) first integrals of the original bosonic system, is discussed on the example of the rational Ruijsenaars–Schneider model.

The group of finite renormalizations relating various renormalization prescriptions is considered as an infinite dimensional Lie group. The corresponding Lie algebra is constructed, and the Abelian subgroup corresponding to the changing of the renormalization point is studied. It is demonstrated that it can be used for obtaining all-order exact expressions for the renormalization constants relating them to the renormalization group functions.

We have shown that the vector and tensor analyzing powers ({{A}_{y}}), ({{A}_{{yy}}}) and also double spin correlation coefficients ({{C}_{{y,y}}}), ({{C}_{{yy,y}}}) of the reaction (dd to n + p + d) in the impulse approximation are linearly connected to the corresponding observables of the (pd)-elastic scattering. The obtained relations are necessary for motivation of the polarization experiments for the first phase of the SPD NICA project and for analysis of expected data.

The hypothesis is discussed that the standard model formed as a result of the electroweak transition is valid at a higher temperature of the Universe, but with a contracted gauge group. The modified model predicts a temperature threshold of (T sim {{10}^{7}}) GeV, above which only half of the particles (neutrinos, Higgs boson, (u) quark, and its color (R) component), interacting by exchanging photons, neutral (Z) bosons, and (R) gluons, exert a predominant influence on the state of the space environment. The model does not disagree with the LHC data on Higgs boson creation cross sections at energies of 7, 8, 13, and 14 TeV.

We define a comultiplication and consider the action of the Weyl groupoid on affine super Yangians ({{Y}_{hbar }}(hat {s}l(left. m right|n,Pi ))) of a special linear Kac–Moody superalgebra (hat {s}l(left. m right|n,Pi )) depending on an arbitrary system of simple roots П. Affine super Yangians of this kind form a category. Morphisms in this category are specified by the action of elements of the Weyl groupoid. All super Yangians from this category are isomorphic as Hopf superalgebras, but morphisms defined by the action of elements of the Weyl groupoid transform one comultiplication structure into another, generally speaking, different from the initial one. We describe the action of the Yangian Weyl groupoid and the coproduct on super Yangians.

In this project, we will study a bottom–up holographic model for the color superconductivity (CSC) phase in the Einstein–Gauss–Bonnet (EGB) gravity. We consider the color superconductivity in the deconfinement phase which is dual to the planar GB–RN–AdS black hole in six-dimensional spacetime and we find the equation of state of the CSC phase in the inner core of the heavy compact star.

We propose a simple model of two-dimensional (mathcal{N} = 2) superconformal mechanics with a spin-orbit interaction term and demonstrate that it inherits the Galilean symmetry of the initial free-particle system. We then propose a quaternionic counterpart of this system, which describes the four-dimensional (mathcal{N} = 4) superconformal mechanics (D(1,2{kern 1pt} |{kern 1pt} alpha )). The bosonic part of the Hamiltonian describes a free particle on the cone, while the fermionic part necessarily includes the spin–orbit interaction term.

We study the connection between ({text{SU}}(n)) spin chains and one-dimensional sigma models on flag manifolds. Using this connection, we calculate the spectrum of the Laplace–Beltrami operator and geodesics for a particular class of metrics on (mathbb{C}{{mathbb{P}}^{1}}) and ({{mathcal{F}}_{3}}), which is a manifold of complete flags in ({{mathbb{C}}^{3}}).

The results of applying the tagged neutron method for remote non-destructive elemental analysis of a substance on a conveyor are discussed. The tagged neutron method involves irradiating the sample material with fast neutrons having an energy of 14.1 MeV followed by detection of characteristic gamma-ray emission. Neutron tagging is performed using an alpha detector integrated into the neutron generator.

A method for irradiating samples of dielectric composites based on epoxy resins and diamond fillers, intended for adhesive joints in heat removal circuits of microelectronic devices operating in high-radiation fields, is described. It is based on placing the samples inside a massive lead target, which is subsequently irradiated with an intense proton beam at an energy of 660 MeV. The dose accumulated by the samples from the interaction with primary and secondary particles is evaluated using mutually complementing FLUKA and MCNPX models. The results obtained are compared with each other and with dose estimates derived from the induced activity of the Na²² isotope in monitor aluminum foils accompanying the irradiated samples. The primary parameter analyzed is the thermal conductivity of the samples, which degrades under irradiation.