6 research outputs found

    Lattice study of ChPT beyond QCD

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    We describe initial results by the Lattice Strong Dynamics (LSD) collaboration of a study into the variation of chiral properties of chiral properties of SU(3) Yang-Mills gauge theory as the number of massless flavors changes from Nf=2N_f = 2 to Nf=6N_f = 6, with a focus on the use of chiral perturbation theory.Comment: 9 pages, 3 figures. Presented at the 6th International Workshop on Chiral Dynamics, University of Bern, Switzerland, July 6-10 200

    Toward TeV Conformality

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    We study the chiral condensate for an SU(3) gauge theory with NfN_f massless Dirac fermions in the fundamental representation when NfN_f is increased from 2 to 6. For Nf=2N_f=2, our lattice simulations of <ψˉψ>/F3<\bar{\psi} \psi >/F^3, where FF is the Nambu-Goldstone-boson decay constant, agree with the measured QCD value. For Nf=6N_f = 6, this ratio shows significant enhancement, presaging an even larger enhancement anticipated as NfN_f increases further, toward the critical value for transition from confinement to infrared conformality.Comment: 4 pages, 4 figures. v2: revised version for PR

    WW Scattering Parameters via Pseudoscalar Phase Shifts

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    Using domain-wall lattice simulations, we study pseudoscalar-pseudoscalar scattering in the maximal isospin channel for an SU(3) gauge theory with two and six fermion flavors in the fundamental representation. This calculation of the S-wave scattering length is related to the next-to-leading order corrections to WW scattering through the low-energy coefficients of the chiral Lagrangian. While two and six flavor scattering lengths are similar for a fixed ratio of the pseudoscalar mass to its decay constant, six-flavor scattering shows a somewhat less repulsive next-to-leading order interaction than its two-flavor counterpart. Estimates are made for the WW scattering parameters and the plausibility of detection is discussed.Comment: 8 pages, 6 figure
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