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Kinematic Hopf algebra and BCJ numerators at finite $\alpha'$

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arxiv 2403.04614 v1 pith:HPK422ZH submitted 2024-03-07 hep-th

classification hep-th
keywords algebraalphahopfkinematicnumeratorstheoryclosed-formfactorization
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

In this letter, starting from a kinematic Hopf algebra, we first construct a closed-form formula for all Bern-Carrasco-Johansson (BCJ) numerators in Yang-Mills (YM) theory with infinite orders of $\alpha'$ corrections, known as $\rm DF^2+YM$ theory, when coupled to two heavy particles which can be removed through a simple factorization limit. The full $\alpha'$ dependence appears simply in massive physical propagator factors, with factorization strongly constraining the construction. The intricate structure induced by the massive poles also naturally leads us to find a novel closed-form and local expression for BCJ numerators in usual pure YM theory, based directly on the kinematic Hopf algebra.

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Cited by 2 Pith papers

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