9,777 research outputs found
Pseudoscalar Goldstone Bosons Scattering off Charmed Baryons with Chiral Perturbation Theory
We have systematically calculated the pseudoscalar Goldstone boson and
charmed baryon scattering lengths to the third order with heavy baryon chiral
perturbation theory. The scattering lengths can reveal the interaction of , , etc. For each channel, we take into
account of the interaction between the external particle and every possible
charmed baryon in the triplet, sextet, and excited sextet. We use dimensional
regularization and modified minimal subtraction to get rid of the divergences
in the loop-diagram corrections. We notice that the convergence of chiral
expansion for most of the channels becomes better after we let the low energy
constants absorb the analytic contributions of the loop-diagram corrections and
keep the nonanalytic terms only.Comment: 4 pages, 1 figure. Proceeding of Eleventh International Conference on
Hypernuclear and Strange Particle Physics - HYP2012, Barcelon
Pseudoscalar Meson and Charmed Baryon Scattering Lengths
We have calculated the scattering lengths between the pseudoscalar meson and
charmed triplet, sextet, and excited sextet baryon to the third order with the
heavy baryon chiral perturbation theory. The chiral expansion of the pion
channels converges well.Comment: 14 pages, 1 figure, 4 tables; discussion extended, references added,
version published in Phys. Rev. D; typos removed from Eqs. (B2, B5, B6, 19),
erratum corrected in Eq. (B6), tables (I, II, III) update
Chiral Perturbation Theory and the Strong Interaction
We have calculated the potentials of the heavy (charmed or bottomed)
pseudoscalar mesons up to with the heavy meson chiral
perturbation theory. We take into account the contributions from the football,
triangle, box, and crossed diagrams with the 2 exchange and one-loop
corrections to the contact terms. We notice that the total 2-exchange
potential alone is attractive in the small momentum region in the channel
, , or , while repulsive in the channel .
Hopefully the analytical chiral structures of the potentials may be useful in
the extrapolation of the heavy meson interaction from lattice QCD simulation.Comment: 14 pages, 8 figures, 4 tables; discussion extended, references added,
version published in Phys. Rev.
Pseudoscalar Meson and Decuplet Baryon Scattering Lengths
We have systematically calculated the S-wave pseudoscalar meson and decuplet
baryon scattering lengths to the third order in the small scale expansion
scheme of the heavy baryon chiral perturbation theory. We hope the future study
may test the framework and the present predictions.Comment: 14 pages, 1 figures, 9 table
Electric field modulation of topological order in thin film semiconductors
We propose a method that can consecutively modulate the topological orders or
the number of helical edge states in ultrathin film semiconductors without a
magnetic field. By applying a staggered periodic potential, the system
undergoes a transition from a topological trivial insulating state into a
non-trivial one with helical edge states emerging in the band gap. Further
study demonstrates that the number of helical edge state can be modulated by
the amplitude and the geometry of the electric potential in a step-wise
fashion, which is analogous to tuning the integer quantum Hall conductance by a
megntic field. We address the feasibility of experimental measurement of this
topological transition.Comment: 4 pages, 4 figure
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