PAN 428 (office), 624-9582
PAN 470 (lab)
yk @ physics.umn.edu
I grew up in Tokyo, Japan, where I received my PhD. After my degree, I moved to Ithaca, NY, for my post doctoral studies of "bottom" quarks. It was meant to be a three year stint in a foreign country to experience something different before I settled into Japanese society for the rest of my life. But life brings surprises. I ended up finding my wife, and established a family in the US.
Even though we were in love with the culture of Ithaca, NY, when I found an opportunity to start a teaching career in Minneapolis, which was described to us by one of our friends as "a big Ithaca," we jumped on it.
Here, I continued to study bottom quarks and also "charm" quark until 2005. When a chance to switch my focus to high-energy frontier was presented, I decided to take advantage of it.
When I started teaching at Minnesota, I knew nothing about class room culture of the US, but since then, the University has provided me with opportunities to learn about how to be a better teacher in American classrooms. My wife, Susan, is an excellent teacher, though not in physics, and artist, and has given me a lot of great ideas about teaching. This has been a great learning experience, and I hope to grow further as a teacher as well as as a mentor to graduate students.
Here are a list of my current and former graduate students.
* Seth Cooper, PhD. Started his involvement in CMS in the spring of 2007. His PhD research topic is to search for "HSCP" (Heavy Stable Charged Particle). Such a particle is predicted by some version of SUSY or extra dimension theories. If it exists, its mass is likely to be in the several hundreds of GeV/c2, and as a result, its speed is significantly less that the speed of light, c, even though its momentum is large and normal particles with normal masses will have a speed which is virtually indistinguishable with c. This means by measuring the speed of particles in CMS will identify them!
* Mark Lattery, PhD. finished July 1996. Professor at U. of Wisconsin, Oshkosh.
* Vladimir Savinov, PhD. finished December 1996. Associate professor at Pittsburgh.
* Rupak Mahapatra, PhD. finished in December 2000, Assistant professor at Texas A&M.
* Sang-Joon Lee, PhD. Finished in September 2001, Research Associate at Rice.
* Brian Lang, PhD. Finished in December 2006, Staff Scientist, Arete Associates, VA.
DGS, Physics Program, 2004-; McKnight Land Grant Professor, Project leader for the Electromagnetic Calorimeter project for the BTeV experiment, 2000-2005. Review of Babar Construction Project, 1995-97.
|Cosmic muon through CMS|
In 2005, I changed the focus of my research into the high-energy frontier, which allows us to investigate smallest-scale phenomena. At this scale, some of the symmetries which have been hidden at the larger scale observation are believed to be revealed. In addition, over the last decade, some physicists are speculating, in their effort to solve theoretical inconsistencies in the current theories, that there may be more than 3 spatial dimensions. And evidence for such speculation may be gleaned in the current research. Currently (2013) the experiment has collected significant amount of data (2010-2012), and their analyses have revealed that a Higgs particle exists, and it exhibits properties which are consistent with the Higgs boson predicted by the so-called Standard Model of our field. We are, however, hoping that we will find small difference between the predicted and observed Higgs when the properties are precisely measured, and they show us which of the deeper theories are valid. Read more about my students' research above.
Until 2005, I worked on physics of "heavy flavor," studying properties of "bottom" and "charm" quarks. They give rise to systems similar to hydrogen atom, but consisting of quarks instead of a proton and an electron. In hydrogen atom, the proton and the electron are bound to each other by electric force, but in the heavy quark system, they are bound by the so-called strong force or nuclear force which binds protons and neutrons in nuclei. As a result, my research was useful to study how the strong force behaves.
CMS Collaboration, Searches for long-lived charged particles in pp collisions at √s =7 and 8 TeV, JHEP 07 (2013) 122 [abstract]
CMS Collaboration, Search for heavy long-lived charged particles in pp collisions at SQRT(s) = 7 TeV, Phys. Lett. B713 (2012) 408-433 [abstract]
CMS Collaboration, Search for the standard model Higgs boson decaying into two photons in pp collisions at √s=7 TeV, Phys. Lett. B710 (2012) 403-425
CMS Collaboration, Search for Heavy Stable Charged Particles in pp collisions at SQRT(s) = 7 TeV, J. High Energy Phys. 1103 (2011) 024 [abstract]
CMS Collaboration, Search for a Heavy Neutrinos and WR Bosons with Right-handed Couplings in a Left-right Symmetric Model in pp collisions at SQRT(s) = 7 TeV, Phys. Rev. Lett. 109 (2012) 261802 [abstract]
CMS Collaboration, Measurement of the Muon Stopping Power in Lead Tungstate, Journal of Instrumentation 5 P03007 (2010)
G.S. Huang, et al., “Measurement of B(Y(5S)®Bs(*)Bs(*) using f Mesons”, Phys. Rev. (2007)
O. Aquines, et al., “Measurements of the Exclusive Decays of the Y(5S) to B Meson Final States and Improved Bs* Mass Measurement”, Phys. Rev. Letters (2006)
R. Ahohe, et al., “The Search for h(1440)®KSK+π- in Two-Photon Fusion at CLEO”, Phys. Rev. Letters (2005)
Rubin, et al, “Observation of the 1P1 State of Charmonium”, Phys. Rev. Letters (2005)
Rosner, et al., “Observation of the hc(1P1) State of Charmonium”, Phys. Rev. Letters (2005)
G. Brandenburg et al., Measurement of the D+ -> K*0 l+ neutrino Branching Fraction, Physical Review Letters 89, 222001 (2002).
G. Brandenburg et al., Measurement of the Mass, Total Width, and Two-Photon Partial Width of the hc Meson, Physical Review Letters 85, 3095 (2000).
B.H. Behrens et. al., Measurement of the B to rho-lepton-neutrino Decay and Vub, Physical Review D61, 052001 (2000).
J. Bartelt et. al., Measurement of the B to D-lepton-neutrino Branching Fraction and Form Factor, Physical Review Letters 82, 3746 (1999).
J. Gronberg et. al., Light Pseudoscalar Mesons at Large Momentum Transfer, Physical Review D57, 33 (1998)