Abstract
A
bstract
This paper presents a search for hypothetical massive, charged, long-lived particles with the ATLAS detector at the LHC using an integrated luminosity of 139 fb
−
1
of proton–proton collisions at
s
= 13 TeV. These particles are expected to move significantly slower than the speed of light and should be identifiable by their high transverse momenta and anomalously large specific ionisation losses, d
E/
d
x
. Trajectories reconstructed solely by the inner tracking system and a d
E/
d
x
measurement in the pixel detector layers provide sensitivity to particles with lifetimes down to
O
(1) ns with a mass, measured using the Bethe–Bloch relation, ranging from 100 GeV to 3 TeV. Interpretations for pair-production of
R
-hadrons, charginos and staus in scenarios of supersymmetry compatible with these particles being long-lived are presented, with mass limits extending considerably beyond those from previous searches in broad ranges of lifetime.
