Recoil-Safe Subtraction, Matching and Merging in e+e- to hadrons

TL;DR

This paper introduces the first next-to-leading order matched and multi-jet merged predictions for e+e- to hadrons using the Alaric parton shower, improving accuracy in jet simulations at the Z pole.

Contribution

It provides the first NLO matched and multi-jet merged predictions with an NLL-preserving kinematics algorithm for e+e- to hadrons, validated against existing methods.

Findings

Validated infrared subtraction components analytically for up to 5 jets.

Achieved NLO precision for up to five jets in e+e- to hadrons.

Demonstrated improved phenomenological predictions at the Z pole.

Abstract

We present the first next-to-leading order matched and multi-jet merged predictions based on the Alaric parton shower. The components needed for infrared subtraction in the S-MC@NLO algorithm are computed analytically for the case of color singlet decays to hadronic final states and validated against existing approaches for up to e+e- to 5 jets. Phenomenological results for e+e- to hadrons at the Z pole are obtained with up to five jets at next-to-leading order precision, for the first time using an evolution algorithm with NLL-preserving kinematics mapping.