▲ From left, Dr. Jung-gu Lim, Dr. Sung-woo Yoon, and Prof. Sung-keun Park
The research outcomes of the team led by Sung-keun Park, KU physics professor (with Dr. Jung-gu Lim and Dr. Sung-woo Yoon) were introduced in Femilab Today, a magazine from the Fermi National Accelerator Laboratory.
Prof. Park and his Ph. D. student Jung-gu Lim conducted a D0 experiment at the Fermilab to identify the size of the electric charge of the top quark. The standard model (SM) says that the top quark has an electric charge of + 2/3 e. However, other theories (BSM) argue that it has an electric charge of -4/3 e.
Their experiment confirmed the measurement of +2/3 e, which is considered the most precise value identified using the Fermi accelerator so far.
This experiment indicates that it is natural science's job to identify the harmonious compositions of numbers in nature. Just like the "golden ratio" helps better understand spatial aesthetics of nature, explorations into the properties of nature and the relations between the values assigned to each property can help better understand nature's big picture.
It was J. J. Thompson, a British physicist who first discovered electrons in 1897. R. Milikan, an American scientist determined the size of the charge on an electron in 1906. The charge of an electron is 1.602 x 10-19 C (coulombs). It had once been believed that the universe was in integral multiples of the charge of an electron. Later experiments, however, observed particles with fractional charges, and modern physics now states that particles or quarks have fractional charges. The experiment by Professor Park's team measured the size of the charge on the top quark.
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