Mathematical aspects of the nuclear glory phenomenon: from backward focusing to Chebyshev polynomials

International Conference on Particle Physics and Astrophysics

物理学;天文学

Kopeliovich, V.B.^1,2

INR of RAS, Moscow

117312, Russia^1

Moscow Institute of Physics and Technology (MIPT), Dolgoprudny, Russia^2

关键词: Angular dependence;    Characteristic polynomials;    Chebyshev polynomials;    Differential cross section;    Intermediate state;    Mathematical aspects;    Particle production;    Resonance excitation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/798/1/012079/pdf
DOI  :  10.1088/1742-6596/798/1/012079

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

The angular dependence of the cumulative particles production off nuclei near the kinematical boundary for multistep process is defined by characteristic polynomials in angular variables, describing spatial momenta of the particles in intermediate states. Physical argumentation, exploring the small phase space method, leads to the appearance of equations for the polynomials in cos(θ/N), where θ is the polar angle defining the momentum of final (cumulative) particle, the integer N being the number of interactions. The recurrent relations between polynomials with different N and their factorization properties are derived, the connection of these polynomials with known in mathematics Chebyshev polynomials of 2-d kind is established. As a result, differential cross section of the cumulative particle production has characteristic behaviour near the strictly backward direction (θ ∼ π, the backward focusing effect). Such behaviour takes place for any multiplicity of the interaction, beginning with n = 3, elastic or inelastic (with resonance excitations in intermediate states) and can be called the nuclear glory phenomenon.