Semi-Visible Particle Jets: Is Dark Matter Hiding in Plain Sight? — What happens if dark-matte |
. Since the dark-matter particle cannot be seen by the ATLAS detector, researchers look for an imbalance of transverse momentum .
However, some theoretical models predict a “strongly interacting” dark sector, with dark quarks and gluons as replicas of Standard-Model quarks and gluons. Semi-visible jets would arise when dark quarks decay partially to Standard-Model quarks and partially to stable dark hadrons . Since they are produced in pairs, typically along with additional Standard-Model jets, the missing energy arises when all the jets are not fully balanced.
This makes searches for semi-visible jets very challenging, as this event signature can also arise due to mis-measured jets in the detector. For their, physicists had to make sure all such effects had been accounted for. To do this, they focused on a few observables: the uniqueness of the alignment and magnitude of transverse momentum, and the angle between the semi-visible jets. They also investigated scenarios with different invisible fractions and mediating particle masses.
The search for semi-visible jets very challenging, as its event signature can also arise due to mis-measured jets in the detector. How did ATLAS researchers overcome this challenge?
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