# EPS-HEP 2017

5-12 July 2017
Venice, Italy
Europe/Zurich timezone
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## Measurements of multi-jet production in ultra-peripheral lead-lead collisions with the ATLAS detector

7 Jul 2017, 12:45
15m
Room Mangano (Palazzo del Casinò)

### Room Mangano

#### Palazzo del Casinò

Parallel Talk Heavy Ion Physics

### Speaker

Brian Cole (Columbia University (US))

### Description

Beams of relativistic heavy ions accompanied by a large flux of equivalent photons, and photon-induced reactions are the dominant interaction mechanism in heavy-ion collisions when the colliding nuclei have transverse separation larger that the nuclear diameter. In these ultra-peripheral collisions (UPC) the photon can provide a clean probe of the partonic structure of the nucleus analogous with deep inelastic scattering. This talk presents measurements of dijet production in ultra-peripheral Pb+Pb collisions performed with the ATLAS detector. Events are selected using requirements on rapidity gaps and forward neutron production to identify the photo-nuclear processes. The relatively clean environment of these events allows for measurements in a region of x and $Q^2$ where significant nuclear PDF modifications are expected to be present and not strongly constrained by previous measurements.

Experimental Collaboration ATLAS Collaboration

### Presentation Materials

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