LHCf and high-energy cosmic rays

In summary, physicists were surprised by the results of analyzing data from the two LHCf calorimeters in 2010, which showed that high-energy cosmic rays do not interact with the atmosphere as predicted by theory. This discovery may require a re-evaluation of current theories in this research field.
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http://cdsweb.cern.ch/journal/CERNBulletin/2011/17/News Articles/1345733?ln=en

It took physicists by surprise when analysis of the data collected by the two LHCf calorimeters in 2010 showed that high-energy cosmic rays don't interact with the atmosphere in the manner predicted by theory.

Graphe_complet_image.jpg

"Given the significant disparities between the theoretical predictions and our experimental data, I believe that physicists specialising in this research field will be obliged to re-visit their results in the light of this new information."*
 
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I don't see a disagreement between data and theory. I see a range of theories with a factor of 2-4 average variation and the data lying inside this range.
 

1. What is the LHCf experiment?

LHCf (Large Hadron Collider forward) is a particle physics experiment located at the Large Hadron Collider in Switzerland. Its main purpose is to study the particles produced in the very forward region of high-energy proton collisions, providing valuable insights into the cosmic ray phenomena.

2. How does LHCf study high-energy cosmic rays?

LHCf uses the high-energy proton beams from the Large Hadron Collider to simulate the cosmic ray interactions in the Earth's upper atmosphere. By studying the particles produced in these collisions, scientists can learn more about the composition and behavior of cosmic rays.

3. What have been some of the major discoveries made by LHCf?

LHCf has provided important data on the energy spectrum and composition of high-energy cosmic rays, as well as the production mechanisms of particles like photons and neutrons in these collisions. It has also helped confirm some of the predictions of theoretical models for cosmic ray interactions.

4. How does LHCf contribute to our understanding of the universe?

By studying high-energy cosmic rays, which are some of the most energetic particles in the universe, LHCf helps us understand the extreme conditions and processes that occur in distant astrophysical objects. This can provide insights into the origins of the universe and the evolution of galaxies.

5. What are the potential applications of LHCf's research?

The data and knowledge gained from LHCf's research can have various practical applications, such as improving the design and safety of high-altitude aircrafts and spacecrafts, developing better shielding for electronic devices against cosmic rays, and even aiding in the detection and monitoring of potential hazards from space, such as solar storms.

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