Yukinari Sumino
Embedded Files
Title: Professor
Degree: Doctor of Science (University of Tokyo/1993)
Research fields: Elementary particle phenomenology, field theory
Laboratory: Room 1045, 10th floor, Science Building B
E-mail: yukinari.sumino.a4_at_tohoku.ac.jp
Research overview
The aim of my research in the long run, or my ‘dream,’ is to solve the theory of strong interaction QCD non-perturbatively and ultimately open a way to controle the strong force at the same level as the electromagnetic force. Well, that is my wish.
Over the years, I have mainly studied the physics of the strong interaction using perturbative QCD. In particular, the subjects which I studied most frequently are the physics of quarkonium and precise determinations of the fundamental physical constants utilizing them. By advancing perturbative calculations of quarkonium observables to higher orders, we have gained new insights into the quark masses beyond conventional understanding and into the microscopic energy distribution within hadrons. I believe that I am the only researcher in the world who has followed all the steps from first principles to the current highest precision in the calculations of quarkonium observables. It is very exciting to experience in real time how our understanding of the physical phenomena deepens along with the marked progress in computational technology.
I have determined fundamental physical constants, such as mb, mc, αs and |Vcb|, with world's highest level of accuracy at the time. If an e+ e- linear collider is built in the future, mt will be added to that list. (In fact, I originally started these studies as a subject for the physics of linear colliders.) Precise values of these fundamental constants provide hints for Grand Unified Theory and other theories beyond the Standard Model that are expected to hold at high energy scales.
Most of my calculations are carried out analytically, using Mathematica as a calculational tool on a laptop computer.
In addition to the above, I have also worked on subjects such as physics of neutrinos, Higgs boson, top quark, as well as on quantum field theory and renormalons. I am also in charge of the top quark section of the Particle Data Group, where I consolidate experimental data.
One key aspect I consider quite important is to uncover findings that will endure over time—50, or even 100 years from now—so that they can be passed on to future generations. I hope that the results of my research up to now already include such findings.
Hobby
Football and art appreciation
Nowadays I play futsal almost every weekend. I also like to watch football matches (although mostly on TV these days). I would like to see the Japanese men's national team win the World Cup one day.
As for art appreciation, I often visit art museums with my wife.
Glossary
strong force
There are four types of forces in nature. They are the electromagnetic force, gravity, the strong force and the weak force. The strong force is the force that confines quarks in protons and neutrons.
QCD
The theory describing the strong force, named after the acronym Quantum ChromoDynamics.
perturbative QCD
This is one of the methods for calculating physical quantities related to strong forces based on QCD: physical quantities are expanded by perturbative expansions (like Taylor expansions) using the coupling constant αs of the strong force in the QCD theory, and the expansion coefficients are calculated sequentially. Each coefficient is calculated in a method called Feynman diagrams. Perturbative QCD gives a good approximation at high energies and short distances.
non-perturbative effect
At low energies and far distances, the approximation by perturbative QCD becomes worse because the effective coupling constant of QCD becomes larger. In physical phenomena where such effects are large, many features arise that cannot be captured by perturbative QCD, such as quark confinement.
hadron
Bound states of quarks due to the strong force. Many bound states are known, including protons, neutrons and pions.
quarkonium
A bound state (one of the hadrons) made up of a quark-antiquark pair. Theoretical calculations using perturbative QCD are a good approximation when the constituent quarks are the heavy quarks: charm (c), bottom (b) and top (t) quarks. Thus, their observables can be calculated accurately as the perturbation order is increased.
mc, mb, mt
Mass of charm, bottom and top quarks respectively. (There are six types of quarks: up, down, strange, charm, bottom and top quarks, in the order from light to heavy.)
Vcb
One of the Kobayashi-Maskawa matrix elements. One of the fundamental physical constants included in the Standard Model of elementary particles.
grand unified theory (GUT)
A theory that unifies the different gauge interactions in the Standard Model of elementary particles at high energies. In scenarios that predict a certain relationship between lepton and quark masses, for example, the grand unified theory can be verified by precise values of the lepton and quark masses.
Mathematica
Mathematical formula processing programme by Wolfram Research. It can perform numerical as well as algebraic and analytical calculations and solve differential equations.
Particle Data Group
It is engaged in activities such as publishing a list of basic properties of elementary particles and related particles by collating the results of experiments and theoretical developments to date.
Publication
Y. Sumino, K. Fujii, K. Hagiwara, H. Murayama, and C.-K. Ng, "Top Quark Pair Production Near Threshold," Phys. Rev. D47 (1993) 56-81.
H. Murayama and Y. Sumino, "Axial-vector Coupling Contribution to Toponium Resonances,'' Phys. Rev. D47 82-92 (1993).
K. Fujii, T. Matsui, and Y. Sumino, "Physics at t\bar{t} Threshold in e + e - Collisions," Phys. Rev. D50 (1994) 4341-4362.
K. Daikouji, M. Shino, and Y. Sumino, "Bern-Kosower Rule for Scalar QED,'' Phys. Rev. D53, 4598-4615 (1996).
M. Peter and Y. Sumino, "Final-State Interactions in e+ e- -> t\bar{t} -> b l+ \nu \bar{b} W- Near The Top Quark Threshold,'' Phys. Rev. D57, 6912-6927 (1998).
M. Jezabek and Y. Sumino, "Neutrino Mixing and See-saw Mechanism," Phys. Lett. B440 (1998) 327-331.
N. Brambilla, Y. Sumino, and A. Vairo, "Quarkonium Spectroscopy and Perturbative QCD: A New Perspective," Phys. Lett. B513 (2001) 381-390.
N. Brambilla, Y. Sumino, and A. Vairo, "Quarkonium Spectroscopy and Perturbative QCD: massive quark loop effects,'' Phys. Rev. D65, 034001-1 -- 19 (2002).
Y. Sumino, "Connection Between The Perturbative QCD Potential and Phenomenological Potentials,'' Phys. Rev. D65, 054003-1 -- 9 (2002).
S. Recksiegel and Y. Sumino, "Perturbative QCD Potential, Renormalon Cancellation and Phenomenological Potentials,'' Phys. Rev. D65, 054018-1 -- 9 (2002).
Y. Sumino, "QCD potential as a `Coulomb-plus-linear' potential," Phys. Lett. B571 (2003) 173-183.
S. Recksiegel and Y. Sumino, "Fine and Hyperfine Splittings of Charmonium and Bottomonium: An Improved Perturbative QCD Approach,'' Phys. Lett. B578 369-375 (2004).
Y. Sumino, "Static QCD Potential at r < \Lambda_{QCD}^{-1}: Perturbative expansion and operator-product expansion,'' Phys. Rev. D76, 114009-1 -- 38 (2007).
K. Hagiwara, Y. Sumino, and H. Yokoya, "Bound-state Effects on Top Quark Production at Hadron Colliders,'' Phys. Lett. B666, 71-76 (2008).
Y. Sumino, "Family Gauge Symmetry and Koide's Mass Formula,'' Phys. Lett. B671, 477-480 (2009).
Y. Sumino, "Family Gauge Symmetry as an Origin of Koide's Mass Formula and Charged Lepton Spectrum,'' JHEP 0905, 075-1 -- 43 (2009).
C. Anzai, Y. Kiyo, and Y. Sumino, "Static QCD potential at three-loop order,'' Phys. Rev. Lett. 104, 112003-1 -- 4 (2010). [Editors' suggestion and Featured in Physics.]
C. Anzai, Y. Kiyo, and Y. Sumino, "Violation of Casimir Scaling for Static QCD Potential at Three-loop Order,'' Nucl. Phys. B838, 28-46 (2010).
S. Kawabata, Y. Shimizu, Y. Sumino, and H. Yokoya, "Boost-invariant Leptonic Observables and Reconstruction of Parent Particle Mass,'' Phys. Lett. B710, 658-664 (2012).
C. Anzai and Y. Sumino, "Algorithms to Evaluate Multiple Sums for Loop Computations,'' J. Math. Phys., 54, 033514-1 -- 22 (2013).
Y. Kiyo, and Y. Sumino, "Full Formula for Heavy Quarkonium Energy Levels at Next-to-next-to-next-to-leading Order,'' Nucl. Phys. B889,156-191 (2014).
K. Endo and Y. Sumino, "A Scale-invariant Higgs Sector and Structure of the Vacuum,'' JHEP, 1505, 030-1 -- 25 (2015).
S. Kawabata, Y. Shimizu, Y. Sumino, and H. Yokoya, "Weight function method for precise determination of top quark mass at Large Hadron Collider,'' Phys. Lett. B741, 232-238 (2015).
K. Endo, K. Ishiwata and Y. Sumino, "WW scattering in a radiative electroweak symmetry breaking scenario,'' Phys. Rev. D94, 075007-1 -- 17 (2016).
Particle Data Group (C. Patrignani, et al.), "Review of Particle Physics,'' Chin.Phys. C40 no.10, 100001, 1-1808 (2016).
Y. Kiyo, G. Mishima and Y. Sumino, "Determination of m_c and m_b from quarkonium 1S energy levels in perturbative QCD,'' Phys. Lett. B752,122-127 (2016).
Particle Data Group (M. Tanabashi, et al.), "Review of Particle Physics,'' Phys. Rev. D98, 030001 (2018).
H. Takaura, T. Kaneko, Y. Kiyo and Y. Sumino, "Determination of alpha_s from static QCD potential with renormalon subtraction,'' Phys. Lett. B789, 598-602 (2019).
H. Takaura, T. Kaneko, Y. Kiyo and Y. Sumino, "Determination of alpha_s from static QCD potential: OPE with renormalon subtraction and lattice QCD,'' JHEP, 1904, 155-1 -- 40 (2019).
M. Berwein and Y. Sumino, "Perturbative static quark potential in Maximal Abelian gauge,'' Phys. Lett. B799, 135014 (2019).
H. Takaura and Y. Sumino, "On renormalons of static QCD potential at u=1/2 and 3/2,'' JHEP, 2005, 116 (2020).
Particle Data Group (P. A. Zyla, et al.), "Review of Particle Physics,'' Prog. Theor. Exp. Phys. 2020, 083C01, 8 (2020).
Y. Hayashi, Y. Sumino and H. Takaura, "New method for renormalon subtraction using Fourier transform,'' Phys. Lett. B819,136414 (2021).
Y. Hayashi, Y. Sumino and H. Takaura, "Determination of |V_{cb}| using N^3LO perturbative corrections to Gamma(B -> X_c l \nu) and 1S masses,'' Phys. Lett. B829, 137068 (2022).
Particle Data Group (R. L. Workman, et al.), "Review of Particle Physics,'' Prog. Theor. Exp. Phys. 2022, 8, 1-2270 (2022).
Yuuki Hayashi, Go Mishima, Yukinari Sumino, HiromasaTakaura, "Renormalon subtraction in OPE by dual space approach: nonlinear sigma model and QCD," JHEP 06 (2023) 042-1-42
T. Agemura and Y. Sumino, "On order Lambda_{QCD}^2/m renormalons in quarkonium system,'' Phys. Lett. B850 (2024), 138505.
Particle Data Group (S. Navas, et al.), "Review of Particle Physics,'' Phys. Rev. D110 (2024) 3, 030001.
Y. Sumino, "Two-loop O(epsilon) term of 1/(mr^2) heavy quarkonium potential,'' Phys. Lett. B860 (2025), 139223.
Page updated
Google Sites
Report abuse