# What are transverse momentum cuts for?

In experimental papers such as http://arxiv.org/abs/1603.02248 (page 5, section 3.2) there are requirements that the transverse momenta of certain particles are greater than a certain minimum amount in order to be selected for further analysis.

Why is there are requirement like this? Pseudorapidity bounds ensure the particles arrive in the detectors so what does this do?

The only way to get high-$p_T$ particles is if the parton collision has a large invariant mass. If your signal is a heavy particle, then $p_T$ cuts are a good way to reduce background.