Higgs boson production at the LHC using the $q_T$ subtraction formalism at N$^3$LO QCD

TL;DR

This paper extends the $q_T$ subtraction formalism to N$^3$LO in QCD, enabling precise differential calculations of Higgs production at the LHC, and provides the first N$^3$LO rapidity distribution results.

Contribution

It introduces the N$^3$LO $q_T$ subtraction method for Higgs production, including approximations for missing collinear functions, advancing high-precision QCD calculations.

Findings

First N$^3$LO rapidity distribution for Higgs at LHC.

Successful extension of $q_T$ subtraction to N$^3$LO.

Demonstrates numerical implementation of higher-order corrections.

Abstract

We consider higher-order QCD corrections to Higgs boson production through gluon-gluon fusion in the large top quark mass limit in hadron collisions. We extend the transverse-momentum ($q_T$) subtraction method to next-to-next-to-next-to-leading order (N$^3$LO) and combine it with the NNLO Higgs-plus-jet calculation to numerically compute differential infrared-safe observables at N$^3$LO for Higgs boson production in gluon fusion. To cancel the infrared divergences, we exploit the universal behaviour of the associated $q_T$ distributions in the small-$q_T$ region. We document all the necessary ingredients of the transverse-momentum subtraction method up to N$^3$LO. The missing third order collinear functions, which contribute only at $q_T$ =0, are approximated using a prescription which uses the known result for the total Higgs boson cross section at this order. As a first application of the third-order $q_T$ subtraction method, we present the N$^3$LO rapidity distribution of the Higgs boson at the LHC.