May 4, 2024

Probing Particle Collision Data for Clues to the Universe’s Origins

The enjoyment of making discoveries on the global stage is “a lot larger than the pressure,” says Yen-Jie Lee, particle physicist.
When Yen-Jie Lee pertained to MIT as a graduate trainee in 2006, it was a little bit of a culture shock. The ambitious particle physicist had actually studied physics at National Taiwan University before his profession took a hiatus in the forested mountains of Taiwan. There, he worked as a marine corps lieutenant to satisfy the nations needed military service. He still keeps in mind the deafening crackle of weapons drills and the unyielding pressure of daily military life.

” That experience made me into a person who is much less affected by pressure,” Lee remembers. “But after two years residing in a forest of monkeys, my English was quite bad, and I felt like I had forgotten all of the physics I found out.”
Nevertheless, towards completion of his service, Lee applied to PhD programs, consisting of a number of in the United States. When he went to MIT, he felt an immediate kinship with physics professor Wit Busza.
” Even though he could not comprehend me because of my accent, we thought we were each terrific individuals, and at the end of the day I chose to offer myself a shot,” Lee says. “Coming to MIT changed my life totally.”
MIT experimental particle physicist Yen-Jie Lee probes particle crash data for hints to the universes origins. Credit: Bryce Vickmark
As a graduate student in Buszas group, Lee had a career-shaping opportunity to go to Geneva throughout an essential moment in particle physics. There, scientists were preparing to switch on the Large Hadron Collider, the biggest, most powerful particle accelerator on the planet. The accidents of particles produced by the LHC were anticipated to produce conditions comparable to the early universe, and possibly completely new, unpredictable phenomena.
Lee discovered himself at the core of the analysis group, where he rapidly learned to interact with other researchers, in the language of English and the equations of physics. He eventually assisted to measure and analyze some of the LHCs very first accidents– extremely prepared for analyses that Lee, who credits his military training for assisting him remain focused, required to readily.
” There were a number of thousand partners, everyone had an interest in this physics, and I was among the first to get to understand the data,” Lee states. “For me, the enjoyment of these very first measurements was a lot bigger than the pressure.”
Considering that those early days, Lee has actually continued browsing for clues to deep spaces beginnings, using data from the LHC. At MIT, where he is now a tenured associate professor of physics, he is trying to find patterns and interactions in the severe consequences of particle crashes that may inform us something about how deep space came into existence. These experiments might likewise expose the inner operations of other severe environments, such as neutron stars.
” Every time we collect a little piece of info, we comprehend a little bit more about the early universe,” he states. “That makes me wish to know even more.”
” The law of nature”
Lee was born in Taichung City, a commercial municipality in west-central Taiwan. Maturing, he keeps in mind being drawn to math and physics, though in high school he rarely attended class. A hectic schedule of science competitors typically kept him out of school, as he was selected frequently to represent his high school in nationwide science fairs and analytical contests in math, computation, chemistry, and physics.
” It resembled an education for me,” he states.
” Every time we collect a small piece of info, we comprehend a little bit more about the early universe,” Lee says. “That makes me would like to know much more.” Credit: Bryce Vickmark
After completing across numerous subjects, Lee understood that he was most thinking about one: physics. When he enrolled in National University of Taiwan as an undergraduate, he invested his first year handling a range of physics internships, consisting of working in an optics laboratory, assisting in a research study of superconductors, and in an observatory to track the stars. It was an internship in speculative particle physics that set his academic career in motion.
Lee worked as an intern on the Belle experiment, a particle physics experiment that ran out of the KEKB particle accelerator in Tsukuba, Japan. Researchers consisting of Lee looked for signs of exotic particles and tracked the decay of rare particles in the annihilations aftermath.
” I had a great deal of enjoyable with this really simple system,” states Lee, who based his undergraduate and masters theses on Belle experiment information. “It made me desire to learn the law of nature, and whether we can discover new physics and new phenomena involving particle detection.”
Jet travel
After completing his military service in Taiwan, Lee concerned MIT and joined his advisor Busza on work at the LHC, where the accelerator was preparing to collide heavy ions to produce a mix of particles even more complex and exotic than collisions between positrons and electrons.
” Heavy-ion collisions produce an environment thats around 5 trillion degrees, and we can see as this system cools down,” Lee states. “Its generally the exact same course of the early universe, 10 microseconds after the Big Bang.”
Lee was eager to penetrate the fallout of heavy-ion collisions, however at the time initial experiments involved less complex accidents in between protons. As it happens, Lee was positioned in the research team to write the very first physics paper reporting the arise from these initial proton-proton experiments.
The LHC started running its very first heavy-ion experiments towards the end of Lees PhD, and he had the ability to examine a few of the very first information from these much-anticipated runs. Through those analyses, he found fast-moving quarks produced in the accidents, that spotted through the resulting plasma in jets.
” Its like seeing a bullet shot through water,” Lee states. “We can see the wake trailing the bullet, and can use that to discover waters sound propagation. Its the exact same with these jets, where we can utilize quarks to discover the noise of the early universe.”
In 2013, Lee accepted a deal to sign up with MITs physics professors as a member of the Relativistic Heavy Ion Group, where he has actually continued to lead analyses of heavy-ion data from the LHC, and is developing new methods to search for exotic particles and brand-new, unforeseeable phenomena.
” At MIT, the pressure is very high, and there are moments of enjoyment and moments when you feel you are doing not as well as you hoped,” Lee says. “But associates in our group, Gunther Roland and Bolek Wyslouch, have constructed an extremely encouraging environment. I am really grateful for this.”
Something he is likewise glad for has been the opportunity to see the world through his profession in physics. He has actually given talks and went to conferences in more than 30 nations, and has actually taken extended stays in numerous, to experience new point of views.
” When visiting other nations, I would attempt to stay for a couple of months, to discover how various people live their every day life,” Lee states. “Before, I didnt believe I would head out of Taiwan. Ive been so fortunate to experience numerous distinctions.”

As a graduate student in Buszas group, Lee had a career-shaping opportunity to go to Geneva throughout a critical minute in particle physics. After contending across multiple topics, Lee realized that he was most interested in one: physics. Lee worked as an intern on the Belle experiment, a particle physics experiment that ran out of the KEKB particle accelerator in Tsukuba, Japan. Researchers including Lee looked for signs of unique particles and tracked the decay of rare particles in the annihilations aftermath.
” At MIT, the pressure is really high, and there are minutes of excitement and moments when you feel you are doing not as well as you hoped,” Lee states.