<p>We study multi-propagator angular integrals, a class of phase-space integrals relevant to processes with multiple observed final states and a test-bed for transferring loop-integral technology to phase-space integrals without reversed unitarity. We present an Euler integral representation similar to the Lee-Pomeransky representation and explicitly describe a recursive IBP reduction and dimensional shift relations for the general case of <i>n</i> denominators. On the level of master integrals, applying a differential equation approach, we explicitly calculate the previously unknown angular integrals with four denominators for any number of masses to finite order in <i>ε</i>. Extending the idea of dimensional recurrence, we explore the decomposition of angular integrals into branch integrals reducing the number of scales in the master integrals from (<i>n</i> + 1)<i>n</i>/2 to <i>n</i> + 1. To showcase the potential of this method, we calculate the massless three denominator integral and establish all-order results in <i>ε</i>, including a resummation of soft logarithms.</p>

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On multi-propagator angular integrals

  • Juliane Haug,
  • Vladimir A. Smirnov,
  • Fabian Wunder

摘要

We study multi-propagator angular integrals, a class of phase-space integrals relevant to processes with multiple observed final states and a test-bed for transferring loop-integral technology to phase-space integrals without reversed unitarity. We present an Euler integral representation similar to the Lee-Pomeransky representation and explicitly describe a recursive IBP reduction and dimensional shift relations for the general case of n denominators. On the level of master integrals, applying a differential equation approach, we explicitly calculate the previously unknown angular integrals with four denominators for any number of masses to finite order in ε. Extending the idea of dimensional recurrence, we explore the decomposition of angular integrals into branch integrals reducing the number of scales in the master integrals from (n + 1)n/2 to n + 1. To showcase the potential of this method, we calculate the massless three denominator integral and establish all-order results in ε, including a resummation of soft logarithms.