Browsing by Author "Kim, C"

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Open Access
Magnetophoretic circuits for digital control of single particles and cells.
(Nat Commun, 2014-05-14) Lim, B; Reddy, V; Hu, X; Kim, K; Jadhav, M; Abedini-Nassab, R; Noh, Y; Lim, YT; Yellen, BB; Kim, C
The ability to manipulate small fluid droplets, colloidal particles and single cells with the precision and parallelization of modern-day computer hardware has profound applications for biochemical detection, gene sequencing, chemical synthesis and highly parallel analysis of single cells. Drawing inspiration from general circuit theory and magnetic bubble technology, here we demonstrate a class of integrated circuits for executing sequential and parallel, timed operations on an ensemble of single particles and cells. The integrated circuits are constructed from lithographically defined, overlaid patterns of magnetic film and current lines. The magnetic patterns passively control particles similar to electrical conductors, diodes and capacitors. The current lines actively switch particles between different tracks similar to gated electrical transistors. When combined into arrays and driven by a rotating magnetic field clock, these integrated circuits have general multiplexing properties and enable the precise control of magnetizable objects.
Open Access
Pair production of color-octet scalars at the LHC
(Physical Review D - Particles, Fields, Gravitation and Cosmology, 2010-10-26) Idilbi, A; Kim, C; Mehen, T
Heavy colored scalar particles, which exist in many models of new physics, can be pair produced at the LHC via gluon-gluon fusion and possibly form quarkoniumlike bound states. If the scalars are also charged under the electroweak gauge group, these bound states can then decay into electroweak bosons. This yields a resonant cross section for final states such as γγ that can exceed standard model backgrounds. This paper studies this process in the Manohar-Wise model of color-octet scalars (COS). Important threshold logarithms and final state Coulomb-like QCD interactions are resummed using effective field theory. We compute the resummed cross section for gluon-gluon fusion to COS pairs at the LHC as well as the resonant cross section for octetonium decaying to γγ. The latter cross section exceeds the standard model diphoton cross section when the COS mass is less than 500 (350) GeV for √s=14(7)TeV. Nonobservation of resonances below these energies can significantly improve existing bounds on COS masses. © 2010 The American Physical Society.