Lead ion collision C014 / 1793
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Lead ion collision C014 / 1793
Particle tracks from a lead ion collision seen by the CMS (compact muon solenoid) detector at CERN (the European particle physics laboratory) near Geneva, Switzerland. Before the collision the ions had been accelerated by the large hadron collider (LHC). The central tracking chamber (cylindrical) and muon chambers (red rectangles) of the detector are seen end-on in outline. The collision produced a number of unidentified particles (orange) and an upsilon meson. The upsilon meson is not seen, but is revealed through its decay products; a pair of muons (two longest red lines). The green lines show the energy deposited by the muons in the detectors muon chambers. The energies of the unidentified particles are measured by the electrochemical calorimeter (shorter red lines) and the hadron calorimeter (blue)
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Media ID 9227761
© CMS EXPERIMENT, CERN/SCIENCE PHOTO LIBRARY
Apparatus Cern Collision Compact Muon Solenoid Cosmological Cosmology Decay Products Energy European Particle Physics Laboratory Experiment Fundamental Particles Geneva Hadrons Large Hadron Collider Matter Muon Particle Accelerator Particle Detector Particle Physics Particle Track Structure Of Matter Subatomic Particles Switzerland Trace Traces Tracks Trajectories Trajectory Physical
EDITORS COMMENTS
This print captures the aftermath of a lead ion collision, revealing intricate particle tracks observed by the CMS (compact muon solenoid) detector at CERN, near Geneva, Switzerland. Prior to this collision, the lead ions were accelerated by the powerful Large Hadron Collider (LHC), an extraordinary particle accelerator. In this image, we can see the outline of the central tracking chamber and muon chambers of the detector from an end-on perspective. The collision resulted in various unidentified particles depicted in orange, along with a significant discovery - an upsilon meson. Although not directly visible here, its presence is unveiled through its decay products: a pair of muons represented by two elongated red lines. The green lines represent the energy deposited by these muons within the detectors' muon chambers. Additionally, shorter red lines indicate measurements of energy from unidentified particles using both electrochemical calorimeter and hadron calorimeter (blue). This groundbreaking experiment conducted at CERN's European particle physics laboratory provides valuable insights into fundamental particles and their trajectories. It contributes to our understanding of subatomic structures and sheds light on cosmological matters such as dark matter and energy. The collaboration between cutting-edge technology like CMS and high-energy collisions enables scientists to unravel mysteries surrounding matter's composition and explore new frontiers in particle physics. This remarkable photograph serves as a testament to humanity's relentless pursuit of knowledge about our universe's building blocks.
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