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1.
Phys Rev Lett ; 123(7): 071601, 2019 Aug 16.
Artigo em Inglês | MEDLINE | ID: mdl-31491100

RESUMO

We compute the full-color two-loop five-gluon amplitude for the all-plus helicity configuration. In order to achieve this, we calculate the required master integrals for all permutations of the external legs, in the physical scattering region. We verify the expected divergence structure of the amplitude and extract the finite hard function. We further validate our result by checking the factorization properties in the collinear limit. Our result is fully analytic and valid in the physical scattering region. We express it in a compact form containing logarithms, dilogarithms, and rational functions.

2.
Phys Rev Lett ; 123(4): 041603, 2019 Jul 26.
Artigo em Inglês | MEDLINE | ID: mdl-31491268

RESUMO

We evaluate analytically all previously unknown nonplanar master integrals for massless five-particle scattering at two loops, using the differential equations method. A canonical form of the differential equations is obtained by identifying integrals with constant leading singularities, in D space-time dimensions. These integrals evaluate to Q-linear combinations of multiple polylogarithms of uniform weight at each order in the expansion in the dimensional regularization parameter and are in agreement with previous conjectures for nonplanar pentagon functions. Our results provide the complete set of two-loop Feynman integrals for any massless 2→3 scattering process, thereby opening up a new level of precision collider phenomenology.

3.
Phys Rev Lett ; 122(12): 121602, 2019 Mar 29.
Artigo em Inglês | MEDLINE | ID: mdl-30978051

RESUMO

We compute the symbol of the full-color two-loop five-particle amplitude in N=4 super Yang-Mills theory, including all nonplanar subleading-color terms. The amplitude is written in terms of permutations of Parke-Taylor tree-level amplitudes and pure functions to all orders in the dimensional regularization parameter, in agreement with previous conjectures. The answer has the correct collinear limits and infrared factorization properties, allowing us to define a finite remainder function. We study the multi-Regge limit of the nonplanar terms, analyze its subleading power corrections, and analytically present the leading logarithmic terms.

4.
Phys Rev Lett ; 121(2): 021602, 2018 Jul 13.
Artigo em Inglês | MEDLINE | ID: mdl-30085709

RESUMO

We consider finite superamplitudes of N=1 matter, and use superconformal symmetry to derive powerful first-order differential equations for them. Because of on-shell collinear singularities, the Ward identities have an anomaly, which is obtained from lower-loop information. We show that in the five-particle case, the solution to the equations is uniquely fixed by the expected analytic behavior. We apply the method to a nonplanar two-loop five-particle integral.

5.
Med Tr Prom Ekol ; (3): 17-21, 2006.
Artigo em Russo | MEDLINE | ID: mdl-16755760

RESUMO

Psychophysiologic selection for "human-technics" occupations. Expert evaluations determine composition and value of occupational traits for each occupation, fitness is assessed through match between the candidate's test parameters and psychophysiologic standard for each occupation.


Assuntos
Processamento Eletrônico de Dados , Ocupações , Seleção de Pessoal/métodos , Psicofisiologia/instrumentação , Tecnologia/instrumentação , Desenho de Equipamento , Humanos , Federação Russa , Inquéritos e Questionários
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