# 10th International Workshop on Multiple Partonic Interactions at the LHC

10-14 December 2018
Auditorium Santa Cecilia , Perugia, Italy
Europe/Zurich timezone
2008 - 2018

## Probing colour reconnection using boosted hadronically decaying top quarks

13 Dec 2018, 15:40
20m
Auditorium Santa Cecilia , Perugia, Italy

#### Auditorium Santa Cecilia , Perugia, Italy

Via Fratti, 2 - 06123 Perugia Italy

### Speaker

Deepak Kar (University of the Witwatersrand (ZA))

### Description

One of the largest uncertainty in many top quark measurements is the one on the modelling of colour reconnection (CR) between top quark decay products. There have been several experimental measurements, notably of the pull angle in $t\overline{t}$ events, which were intended to provide useful input to CR modelling, but we have not seen strong sensitivity. In this presentation, we propose a novel way to to construct observables sensitive to CR using a large-radius jet containing all decay products of a boosted hadronically decaying top quark. We construct geometrical areas between the subjets, and measure charged particle activity in those areas. At particle level, we see difference in activity when the areas are constructed between colour-connected subjets, and otherwise.

### Primary authors

Deepak Kar (University of the Witwatersrand (ZA)) Dimbiniaina Rafanoharana (University of the Witwatersrand (ZA))