# Quark Matter 2019 - the XXVIIIth International Conference on Ultra-relativistic Nucleus-Nucleus Collisions

3-9 November 2019
Wanda Reign Wuhan Hotel
Asia/Shanghai timezone

## First direct measurement of the dead-cone effect at colliders using iterative declustering techniques in the Lund plane, with D meson jets in pp collisions at $\sqrt{s}$ = 13 TeV with ALICE

5 Nov 2019, 09:20
20m
Ball Room 2 (Wanda Reign Wuhan Hotel)

### Ball Room 2

#### Wanda Reign Wuhan Hotel

Oral Presentation Jet modifications and medium response

### Speaker

Nima Zardoshti for the ALICE Collaboration (CERN)

### Description

We report the first direct measurement of the dead-cone effect at colliders, using iterative jet declustering techniques in pp collisions at $\sqrt{s}=13$ TeV. The procedure detailed in, exposes the splittings of D mesons in the jet shower, by iteratively declustering the angular ordered C/A tree. The splitting history of the D meson initiated jet is mapped onto the Lund plane, where appropriate cuts can be made to suppress hadronisation effects. The reported variable is the splitting angle with respect to the D meson axis, which is updated after each splitting. Track-based jet finding, along with the low $p_{\rm T}^{\rm ch}$ reach of the ALICE detector, allow for an accurate reconstruction of the splitting angle in the phase-space where the dead-cone effect is expected to be largest. The results are compared to those of inclusive jets and theoretical models.