Bulletin of the American Physical Society
2007 Ohio Section of the APS Spring Meeting
Volume 52, Number 5
Friday–Saturday, May 4–5, 2007; Ypsilanti, Michigan
Session C3: High Energy Physics |
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Chair: Uwe Trittman, Otterbein College Room: EMU Student Center 310B |
Saturday, May 5, 2007 8:24AM - 8:36AM |
C3.00001: Measurement of branching fractions for $B_s^0\rightarrow J/\psi \phi$ and $B_s^0\rightarrow J/\psi K_s^0$ decays at $\Upsilon(5S)$ Kazi Sayeed, Alan Schwartz We measure the branching fractions for $B_s^0\rightarrow J/\psi \phi$ and $B_s^0\rightarrow J/\psi K_s^0$ decays using a $\sim$23.5 $fb^{-1}$ data sample collected on the $\Upsilon(5S)$ resonance by the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider. The $J/\psi$ candidates are reconstructed from both $e^+e^-$ and $\mu^+\mu^-$ pairs; $\phi$ candidates are reconstructed from $K^+K^-$ pairs and $K_s^0$ candidates from $\pi^+\pi^-$ pairs. [Preview Abstract] |
Saturday, May 5, 2007 8:36AM - 8:48AM |
C3.00002: S/particle Pole Masses at Two Loops David Robertson Upcoming experiments at the LHC (and a possible future linear collider) will require theoretical calculations at two-loop, and even higher, levels in quantum field theory. As an example, supersymmetry (SUSY) predicts the existence of many new particles with perturbative interactions. The most important observables in softly broken SUSY are just the new particle masses. Comparisons of particular models of SUSY breaking with experiment will thus require systematic methods for two-loop computation of physical pole masses in terms of the underlying Lagrangian parameters. I describe techniques for performing such calculations, based on Tarasov's recurrence relation algorithm and a set of software tools (TSIL) for computing the resulting dimensionally regularized self-energy integrals. [Preview Abstract] |
Saturday, May 5, 2007 8:48AM - 9:00AM |
C3.00003: Spectrum and thermodynamic properties of two-dimensional N=(1,1) super Yang-Mills theory with fundamental matter and a Chern-Simons term Uwe Trittmann We consider N=(1,1) super Yang-Mills theory in 1+1 dimensions with fundamentals at large-N$_c$. A Chern-Simons term is included to give mass to the adjoint partons. Using the spectrum of the theory, we calculate thermodynamic properties of the system as a function of the temperature and the Yang-Mills coupling. In the large-N$_c$ limit there are two non-communicating sectors, the glueball sector, which we presented previously, and the meson-like sector that we present here. We find that the meson- like sector dominates the thermodynamics. Like the glueball sector, the meson sector has a Hagedorn temperature T$_H$, and we show that the Hagedorn temperature grows with the coupling. We calculate the temperature and coupling dependence of the free energy for temperatures below T$_H$. As expected, the free energy for weak coupling and low temperature grows quadratically with the temperature. Also the ratio of the free energies at strong coupling compared to weak coupling, r$_{s-w}$, for low temperatures grows quadratically with T. In addition, our data suggest that r$_{s-w}$ tends to zero in the continuum limit at low temperatures. [Preview Abstract] |
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