期刊
EUROPEAN PHYSICAL JOURNAL C
卷 78, 期 1, 页码 -出版社
SPRINGER
DOI: 10.1140/epjc/s10052-018-5562-1
关键词
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资金
- Swiss National Science Foundation (SNF) [PP00P2-128552, BSCGI0-157722]
- Research Executive Agency (REA) of the European Union [PITN-GA-2012-316704]
Building on the open-loop algorithm we introduce a new method for the automated construction of one-loop amplitudes and their reduction to scalar integrals. The key idea is that the factorisation of one-loop integrands in a product of loop segments makes it possible to perform various operations on-the-fly while constructing the integrand. Reducing the integrand on-the-fly, after each segment multiplication, the construction of loop diagrams and their reduction are unified in a single numerical recursion. In this way we entirely avoid objects with high tensor rank, thereby reducing the complexity of the calculations in a drastic way. Thanks to the on-the-fly approach, which is applied also to helicity summation and for the merging of different diagrams, the speed of the original open-loop algorithm can be further augmented in a very significant way. Moreover, addressing spurious singularities of the employed reduction identities by means of simple expansions in rank-two Gram determinants, we achieve a remarkably high level of numerical stability. These features of the new algorithm, which will be made publicly available in a forthcoming release of the OPENLOOPS program, are particularly attractive for NLO multi-leg and NNLO real-virtual calculations.
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