# Measurement of the $W^+W^-$ production cross section in $pp$ collisions at a centre-of-mass energy of $\sqrt{s}$ = 13 TeV with the ATLAS experiment

## TL;DR

This paper reports a measurement of the W+W- production cross section in proton-proton collisions at 13 TeV using ATLAS data, showing agreement with theoretical predictions.

## Contribution

First measurement of W+W- production cross section at 13 TeV in a fiducial phase space with ATLAS data, comparing results to state-of-the-art calculations.

## Key findings

- Measured cross section consistent with theoretical predictions
- Used 3.16 fb$^{-1}$ of data from 2015
- Focused on leptonic decay channels without jets

## Abstract

The production of opposite-charge $W$-boson pairs in proton-proton collisions at $\sqrt{s}$ = 13 TeV is measured using data corresponding to 3.16 fb$^{-1}$ of integrated luminosity collected by the ATLAS detector at the CERN Large Hadron Collider in 2015. Candidate $W$-boson pairs are selected by identifying their leptonic decays into an electron, a muon and neutrinos. Events with reconstructed jets are not included in the candidate event sample. The cross-section measurement is performed in a fiducial phase space close to the experimental acceptance and is compared to theoretical predictions. Agreement is found between the measurement and the most accurate calculations available.