When a high energy parton traverses the medium (QGP), it undergoes multiple interactions with the medium constituents leading to a modification of its radiation pattern. 

By utilizing jet angularity measurements on such a jet, one can control the sensitivity of the observable to collinear emissions in the jet through a continuous parameter a, with a<2. We utilise the framework of SCET with Glauber gluons (SCETG) to study medium effects on ungroomed angularity distributions for the range a<1. 

Within SCETG, the jet-medium interactions are incorporated by off-shell Glauber gluons generated from the color charges in the medium. 

We find that, in the medium, the angularity distributions are narrower and have a steeper fall compared to the vacuum ones. 

I will provide a qualitative understanding of this apparent narrowing effect in the medium, consistently within the SCETG framework.