Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session Z7: Advances in Field Theory and String Theory |
Hide Abstracts |
Sponsoring Units: DPF Room: Marriott Tampa Waterside Room 1 |
Tuesday, April 19, 2005 3:30PM - 3:42PM |
Z7.00001: Standard Model and beyond within the framework of Non-Commutative Geometry Cosmin Macesanu, Kameshwar C. Wali We study the minimal Standard Model, Left-right Symmetric Model and their extensions within the framework of a discretized Kaluza-Klein version of a two-sheeted space-time. Left- and right- chiral fields live on two separate sheets. The main virtue of this approach is that it treats gauge fields and Higgs fields on a similar geometrical footing leading to a definite spontaneous symmetry breaking pattern. This results in a number of predictions concerning the Higgs sector of our theory. [Preview Abstract] |
Tuesday, April 19, 2005 3:42PM - 3:54PM |
Z7.00002: QEDxQCD Exponentiation and Shower/ME Matching at the LHC Bennie Ward, Stanislaw Jadach, Mikhail Kalmykov, Scott Yost We present the theory of QEDxQCD exponentiation for LHC processes with an eye toward shower/ME matching. We show that we can systematically improve the attendant MC or semi-analytical results order by order in perturbation theory without double counting while treating the respective phase space exactly. [Preview Abstract] |
Tuesday, April 19, 2005 3:54PM - 4:06PM |
Z7.00003: Comparisons of Virtual Corrections to Bremsstrahlung in Radiative Return at High Energy $e^+ e^-$ Colliders Scott Yost, S. Jadach, B.F.L. Ward Radiating a photon from the initial state provides a useful tool for studying a range of low energy physics using a high-energy $e^+ e^-$ accelerator. Accurate results require careful calculation of the first order virtual photon corrections. We compare two exact results for initial state radiative corrections, finding agreement to within $10^{-5}$ or better as a fraction of the Born cross section. [Preview Abstract] |
Tuesday, April 19, 2005 4:06PM - 4:18PM |
Z7.00004: Virasoro generators and the dS$_3$/CFT$_2$ correspondence Scott Ness We discuss the quantization of a scalar field in three-dimensional de Sitter space. By extending the isometry group to include asymptotic symmetries, we obtain explicit expressions for the corresponding charges and show that they satisfy the Virasoro algebra with c=3l/2G. The charges act on the scalar field near the boundary in a way prescribed by the dS/CFT correspondence. [Preview Abstract] |
Tuesday, April 19, 2005 4:18PM - 4:30PM |
Z7.00005: Two-dimensional super Yang-Mills theory investigated with improved resolution Uwe Trittmann In earlier work, N=(1,1) super Yang--Mills theory in two dimensions was found to have several interesting properties, though these properties could not be investigated in any detail. In this paper we analyze two of these properties. First, we investigate the spectrum of the theory. We calculate the masses of the low-lying states using the supersymmetric discrete light-cone (SDLCQ) approximation and obtain their continuum values. The spectrum exhibits an interesting distribution of masses, which we discuss along with a toy model for this pattern. We also discuss how the average number of partons grows in the bound states. Second, we determine the number of fermions and bosons in the N=(1,1) and N=(2,2) theories in each symmetry sector as a function of the resolution. Our finding that the numbers of fermions and bosons in each sector are the same is part of the answer to the question of why the SDLCQ approximation exactly preserves supersymmetry. [Preview Abstract] |
Tuesday, April 19, 2005 4:30PM - 4:42PM |
Z7.00006: On the nonperturbative solution of quantum field theories John Hiller Light-cone quantization and numerical methods can be used to approximate nonperturbative solutions of quantum field theories. For non-supersymmetric theories, massive Pauli--Villars particles are included in the Lagrangian to provide ultraviolet regularization. Applications to quantum electrodynamics and super Yang--Mills theory will be summarized; results of more extensive calculations for Yukawa theory will be presented in some detail. [Preview Abstract] |
Tuesday, April 19, 2005 4:42PM - 4:54PM |
Z7.00007: Verification of the Ward Identites and Generalization to the Comma Field Theory Benjamin Sauerwine, Abdulmajeed Abdurrahman The proof for the Ward identities in the gauge invariant open string field theory of Witten requires checking a set of mathematical identities. These identities are cumbersome to establish analytically. In this paper we construct a numerical procedure capable of checking the Ward identities to any desired level. Furthermore, we discuss the generalization of the Ward identities to the Comma field theory of the open bosonic string and discuss how the generalized Ward identities can be established numerically. [Preview Abstract] |
Tuesday, April 19, 2005 4:54PM - 5:06PM |
Z7.00008: Bound States in the Noncommutative Plane Subir Ghosh We demonstrate that the (non-relativistic) electrostatic potential felt by fermions or bosons - minimally coupled to a Maxwell-Chern-Simons theory in the noncommutative plane, can generate bound states between like charges. The result is reminiscent of models in commutative spacetime with non-minimal Pauli magnetic coupling. Results up to one loop and all orders in $\theta$- the noncommutative parameter, are under study. [Preview Abstract] |
Tuesday, April 19, 2005 5:06PM - 5:18PM |
Z7.00009: Variational Method for Few-Body Bound States in QFT J. W. Darewych, M. Emami Razavy, A. Terekidi We discuss a variational method for deriving relativistic few-body equations in QFT. The method is illustrated on two, three and four body systems in a strongly coupled model, namely the Scalar Yukawa (Wick-Cutkosky) model, and on QED (the muonium, positronium and muonic hydrogen systems). A reformulation of the models is employed, in which covariant Green functions are used to solve the field equations partially, so as to express the mediating field in terms of the particle fields. The resulting reformulated Hamiltonian of the quantized system thereby contains an interaction term in which the mediating-field Green function is sandwiched between the particle currents. Numerical solutions of two, three and four body equations are presented for the scalar Yukawa model for various strengths of the coupling. The results are compared, where possible, to Bethe-Salpeter based and other calculations. Perturbative solutions of the two-fermion equations are presented and compared to other calculations as well as to experimental results for some states of muonium. [Preview Abstract] |
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