# Connecting The Dots / Intelligent Trackers 2019

Apr 2 – 5, 2019
Jardí Botànic de València
Europe/Zurich timezone

## Unconventional Tracking Techniques for Long-Lived Particle Searches in ATLAS

Apr 5, 2019, 10:00 AM
25m
Jardí Botànic de València

#### Jardí Botànic de València

Carrer Quart 80, 46008 València, Spain
Talk 3: Advanced usage of tracks

### Speaker

Matthew Gignac (University of California,Santa Cruz (US))

### Description

A variety of Beyond the Standard Model (BSM) theories predict new particles with macroscopic lifetimes of $c\tau\geq {\cal O}(1~{\rm mm})$ that could be created in proton-proton collisions at the Large Hadron Collider (LHC). Such theories often give rise to signatures that require dedicated tracking and vertexing techniques beyond conventional tracking algorithms. In this talk, a variety of unconventional tracking and vertexing techniques for long-lived particle searches in ATLAS will be discussed, including a secondary vertex algorithm for heavy neutral particles decaying to hadronic and leptonic final states within the ATLAS Inner Detector, a disappearing charged track reconstruction technique, which extends to trajectories with as few as three position measurements in the ATLAS pixel detector, and a new region-of-interest track seeding technique for low momentum tracking to target tracks originating from the long-lived charged particle decays within the Inner Detector. The performance of these unconventional tracking techniques will be discussed in the context of a variety of BSM theories in preparation for full Run 2 analyses with the ATLAS detector.

### Primary author

Matthew Gignac (University of California,Santa Cruz (US))

### Co-authors

Matthias Danninger (University of British Columbia (CA)) Nora Emilia Pettersson (University of Massachusetts (US))