# The Lund Jet Plane in PbPb Collisions and Other Applications with CMS

- Institution: CERN
- Department: LHC Seminar
- Speaker: Vangelis Vladimirov
- Year: 2025
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3021195)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

We will discuss the first momentum scale (kT) scan of the Lund Jet Plane (LJP) in heavy-ion collisions by CMS. The LJP is a two-dimensional representation of the phase space of emissions inside a jet constructed using iterative Cambridge-Aachen declustering. Its measurement in pp collisions allows to constrain the different ingredients of the parton shower and hadronization in a modular fashion. In heavy-ion collisions, the Quark Gluon Plasma is expected to affect the parton shower and modify the measured LJP relative to pp collisions. A kT scan of the Lund plane allows us to explore the scale dependence of the jet-QGP interactions. Our measurement was designed to test the validity of the factorisation between the early vacuum and QGP-induced stages of jet evolution in heavy ion collisions, which is an assumption of several jet quenching models.

In addition, we'll discuss a new method that uses the LJP to improve the modelling in simulation of large-R multi-prong jets due to the decay of heavy resonances into multiple SM quarks. The method has interesting applications also for jets in heavy-ion collisions.

Refreshments will be served at 10h30 .

0:00:00 Slide 1

0:01:38 Slide 2

0:03:30 Slide 3

0:04:53 Slide 4

0:06:48 Slide 5

0:09:17 Slide 6

0:11:09 Slide 7

0:12:12 Slide 8

0:13:42 Slide 9

0:14:57 Slide 10

0:16:40 Slide 11

0:18:01 Slide 12

0:19:22 Slide 13

0:20:57 Slide 14

0:22:52 Slide 15

0:24:32 Slide 16

0:25:37 Slide 17

0:26:40 Slide 18

0:28:06 Slide 19

0:29:50 Slide 20

0:31:48 Slide 21

0:33:30 Slide 22

0:35:02 Slide 23

0:38:38 Slide 24

0:40:13 Slide 25

0:41:51 Slide 26

0:43:03 Slide 27

0:44:21 Slide 28

## Lectures

1. [The Lund Jet Plane in PbPb Collisions and Other Applications with CMS](https://invisiblenetwork.ai/learn/cern/3021195/8db12c45967b), 48 min (CERN's player)