Dead cone effect, ALICE detector

Numéro d’image : 14112631
Dead cone effect, ALICE detector
Graphic of the dead cone effect detected by ALICE (A Large Ion Collider Experiment) at CERN (European Particle Physics Laboratory). The effect occurs when a charm quark (c) in a parton shower loses energy by emitting radiation in the form of gluons (g). For angles smaller than the ratio of the quark's mass (m) and energy (E), the shower displays a 'dead cone' of suppressed radiation around the quark. As the parton shower proceeds, gluons are emitted at smaller angles and the energy of the quark decreases, resulting in larger dead cones of suppressed gluon emission. Quantum chromodynamics predicted the dead cone effect in the 1990s as part of the strong force theory. This result directly confirms this feature of the theory and also exposes the mass of the charm quark.
Licence : Droits gérés
Crédit: Science Photo Library / CERN / Daniel Dominguez
Taille de l’image : 4180 px × 4180 px
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Property Release : Non requis
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  • Editorial use only. This image may not be used to state or imply endorsement by CERN or CERN employees of any product, activity or service. Not to be used in a military context.

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