Regular Article - Theoretical Physics
The diphoton spectrum at NLL + NNLO
Department of Physics, Brookhaven National Laboratory, 11973, Upton, NY, USA
Accepted: 27 September 2021
Published online: 14 October 2021
We present a -resummed calculation of diphoton production at order NLL + NNLO. To reach the primed level of accuracy we have implemented the recently published three-loop virtual corrections in the channel and the three-loop transverse momentum dependent beam functions and combined them with the existing infrastructure of CuTe-MCFM, a code performing resummation at order NLL. While the primed predictions are parametrically not more accurate, one typically observes from lower orders and other processes that they are the dominant effect of the next order. We include in both the and loop-induced gg channel the hard contributions consistently together at order and find that the resummed channel without matching stabilizes indeed. Due to large matching corrections and large contributions and uncertainties from the gg channel, the overall improvements are small though. We furthermore study the effect of hybrid-cone photon isolation and hard-scale choice on our fully matched results to describe the ATLAS TeV data and find that the hybrid-cone isolation worsens agreement at small compared to smooth-cone isolation.
© The Author(s) 2021
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