Natural Units

Submitted by Steven Goldfarb on
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Natural Units

Natural Units

Our universe is governed by a handful of fundamental constants, such as the speed of light or the gravitational constant. In particle physics, it is often convenient to use natural units, in which key constants are set to unity, revealing the underlying simplicity of physical laws.

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5

Spin & Polarisation

Submitted by Steven Goldfarb on
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Spin and Polarisation

Spin and Polarisation

Spin is a fundamental property of particles, corresponding to their intrinsic angular momentum. Polarisation describes how the spin of a particle is oriented.

2025 Thesis Award Winners

ATLAS Year

The ATLAS Thesis Award winners for 2025 are:

See the News Article on the 2025 Awards.

ATLAS Open Virtual Visit

Submitted by Muhammad Alhroob on

Join us for an Open ATLAS Virtual Visit, hosted by ATLAS physicists Christian Appelt and Despoina Sampsonidou.

This live virtual event will take you inside the ATLAS cavern at CERN, offering a rare opportunity to see the ATLAS detector up close before the cavern is closed for LHC operation. From 100 meters underground, the hosts will guide you around one of the world’s largest and most sophisticated scientific instruments.

Pile-Up

Submitted by Steven Goldfarb on
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Pile-Up

Pile-Up

The LHC collides bunches (groups of protons), which can result in multiple proton-proton collisions at each crossing. Such additional collisions are called pile-up.

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5

ATLAS Coordinate System

Submitted by Steven Goldfarb on
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ATLAS Coordinate System

ATLAS Coordinate System

The ATLAS coordinate system allows scientists to accurately and consistently describe how particles travel through the detector.

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5

Inside a Collision

Submitted by Steven Goldfarb on
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Inside a Collision

Inside a Collision

Proton collisions at the LHC generate high-energy events, initiating a cascade of processes, such as parton showering and hadronisation, which ultimately produce the particles seen in the ATLAS detector.

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5