Jets at CMS and the determination of their energy scale

Jets are the experimental signatures of quarks and gluons produced in high-energy processes such as head-on proton-proton collisions. As quarks and gluons have a net colour charge and cannot exist freely due to colour-confinement, ...

New particle flow algorithm improves ATLAS experiment precision

Proton collisions in the Large Hadron Collider often result in the production of "jets" of particles. These jets are a key element in the measurement of many processes, such as the decays of Higgs bosons or other exotic particles. ...

Smallest LHC experiment has cosmic outing

Roughly once a year, the smallest Large Hadron Collider (LHC) experiment, LHC-forward (LHCf), is taken out of its dedicated storage on the site near the ATLAS experiment, reinstalled in the LHC tunnel, and put to use investigating ...

Shining light on the inner details and breakup of deuterons

Scientists have found a way to "see" inside deuterons, the simplest atomic nuclei, to better understand the "glue" that holds the building blocks of matter together. The new results come from collisions of photons (particles ...

Collisions of coronal mass ejections can be super-elastic

Coronal mass ejections (CMEs), emissions of magnetized ionized gas from the Sun, can damage satellites and communication technology, so being able to predict where they are heading and how much energy they have is important ...

How 'sticky' is dense nuclear matter?

Colliding heavy atomic nuclei together creates a fluidlike soup of visible matter's fundamental building blocks, quarks and gluons. This soup has very low viscosity—a measure of its "stickiness," or resistance to flow.

PhD researcher seeks origin of cosmic rays

As cosmic ray particles penetrate our atmosphere, they collide with air molecules and produce new high-energy particles. These particles, in turn, are involved in further collisions. The whole process is known as an air shower. ...

LHCf continues to investigate cosmic rays

LHCf has completed its first data-taking period during LHC Run 3, taking advantage of the record 13.6 TeV collision energy. This coincides with the machine's record fill time of 57 hours.

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