“Ghost particles” first detected by the Large Hadron Collider

Physicists have detected “ghost particles” in Large Hadron Collider first time. An experiment called FASER picked up a clear signal of neutrinos produced by particle collisions. This helps scientists better understand important physics.

Neutrinos are elementary particles that are electrically neutral, very light, and rarely interact with matter particles. They are very common, but it makes them difficult to detect – in fact, billions of neutrinos are currently flowing through your body. For this reason, they are often described as ghost particles.

Neutrino Performer, Supernova, quasar.. From cosmic rays that interact with radioactive decay and atoms in the Earth’s atmosphere. It has long been thought that particle accelerators like the LHC should also make them, but without the right equipment, they will be undetected and compressed.

And now that “correct device” has been installed and tested. During a pilot run of an experiment called FASER, which was set up in 2018, scientists picked up six neutrino interactions.

“Before this project, there were no signs of neutrinos on the particle collider,” says Jonathan Fen, co-author of the study explaining the results. “This important breakthrough is a step towards a deeper understanding of these elusive particles and their role in the universe.”

According to the team, the FASER equipment, located 480 meters (1,575 feet) below where the particle collisions occur, behaves like a film photograph. The detector consists of a lead and tungsten plate separated by a layer of emulsion. Some of the neutrinos collide with the nuclei of high-density metals, producing other particles that flow through the emulsion. When the emulsion layers are “developed” like a film, you can see the traces they left behind. And certainly, six of these marks were found in the data.

“After verifying the effectiveness of the emulsion detector approach for observing neutrino interactions generated by particle colliders, the FASER team now uses a much larger and much more sensitive complete instrument. We are preparing a new series of experiments, “says Feng.

This full version, named FASERnu, weighs over 1,090 kg (2,400 lb) compared to the pilot’s 29 kg (64 lb). Due to its increased sensitivity, not only can neutrinos be detected more frequently, but also three different “flavorThey come as well as antineutrinos.

“Given the power of our new detector and the best location of CERN, we expect to be able to record over 10,000 neutrino interactions in the next run of the LHC after 2022,” said the study co-author. One David Casper said. .. “We detect the highest energy neutrinos ever produced from man-made sources.”

The study was published in the journal Physical Review D..

sauce: University of California, Irvine “Ghost particles” first detected by the Large Hadron Collider

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