# A study of jet mass distributions with grooming

## TL;DR

This paper provides a detailed theoretical and phenomenological analysis of jet mass distributions with grooming, including resummation, fixed-order matching, and non-perturbative corrections, to improve comparison with experimental data.

## Contribution

It offers a comprehensive calculation of groomed jet mass distributions at NLO with resummation and phenomenological corrections, enhancing the understanding of jet substructure.

## Key findings

- Resummed jet mass distributions match fixed-order calculations at NLO.
- Including non-perturbative effects improves agreement with Monte Carlo simulations.
- Groomed jet transverse momentum before grooming is preferable for data comparison.

## Abstract

We perform a phenomenological study of the invariant mass distribution of hadronic jets produced in proton-proton collisions, in conjunction a grooming algorithm. In particular, we consider the modified MassDrop Tagger (mMDT), which corresponds to Soft Drop with angular exponent $\beta=0$. Our calculation, which is differential in both jet mass and jet transverse momentum, resums large logarithms of the jet mass, including the full dependence on the groomer's energy threshold $z_\text{cut}$, and it is matched to fixed-order QCD matrix elements at next-to-leading order. In order to account for non-perturbative contributions, originating from the hadronisation process and from the underlying event, we also include a phenomenological correction factor derived from Monte Carlo parton-shower simulations. Furthermore, we consider two different possibilities for the jet transverse momentum: before or after grooming. We show that the former should be preferred for comparisons with upcoming experimental data essentially because the mMDT transverse momentum spectrum is not collinear safe.