Bulletin of the American Physical Society
2017 Fall Meeting of the APS Division of Nuclear Physics
Volume 62, Number 11
Wednesday–Saturday, October 25–28, 2017; Pittsburgh, Pennsylvania
Session DF: Theoretical Approaches to Meson and Baryon Structure |
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Chair: Patrizia Rossi, Thomas Jefferson National Accelerator Facility Room: Salon 6 |
Thursday, October 26, 2017 10:30AM - 10:42AM |
DF.00001: Radiative transitions of heavy quarkonia in basis light-front quantization approach Meijian Li, Yang Li, Pieter Maris, James Vary Quarkonium radiative transitions play a significant role in probing the internal structure of the mesons. We present results for the radiative decay of the charmonium and bottomonium states in the Basis Light-Front Quantization (BLFQ) approach. The light-front wave functions are obtained from the light-front Hamiltonian approach in a holographic basis [1, 2]. With these wave functions we compute transitions between vector and pseudoscalar mesons below the open-flavor thresholds, without adjusting any parameters. Comparisons are made with the experimental measurements as well as results from Lattice QCD. [1] Y.~Li, P.~Maris, X.~Zhao and J.~P.~Vary, Phys. Lett. B {\bf 758}, 118 (2016) [2] Y.~Li, P.~Maris and J.~P.~Vary, (in press) arXiv:1704.06968 [hep-ph]. [Preview Abstract] |
Thursday, October 26, 2017 10:42AM - 10:54AM |
DF.00002: Scattering from lattice QCD including higher partial waves and multiple decay channels Colin Morningstar, John Bulava, Ruairi Brett, Jacob Fallica, Andrew Hanlon, Ben Hoerz, Bijit Singha A new implementation of estimating the two-to-two K-matrix from finite-volume energies based on the Luescher formalism is described. The method includes higher partial waves and multiple decay channels, and the fitting procedure properly includes all covariances and statistical uncertainties. The method is also simpler than previously used procedures. Formulas and software for handling total spins up to S=2 and orbital angular momenta up to L=6 are presented. [Preview Abstract] |
Thursday, October 26, 2017 10:54AM - 11:06AM |
DF.00003: Testing the Khuri-Treiman method with $\pi\pi$ scattering Nathan Sherrill A common dispersive approach to modeling hadronic amplitudes is the so-called Khuri-Treiman (KT) method. This method involves approximating the amplitude as a linear combination of truncated partial wave series in all scattering channels simultaneously. A limitation of this approach is that---in part due to the inclusion of a finite number of partial waves---its descriptive power is intrinsically limited to low energies. Recently there has been renewed interest in applying this method to processes at energies where inelastic effects cannot be ignored. It is therefore unclear if studying these processes using KT is valid. Here, we investigate this issue by studying $\pi\pi$ scattering using the KT representation of the amplitude. Specifically, we use established parameterizations of $\pi\pi$ phase shifts from threshold to $\sqrt{s} \sim 1.4$ GeV as inputs to test the method at energies above the elastic approximation. [Preview Abstract] |
Thursday, October 26, 2017 11:06AM - 11:18AM |
DF.00004: Spectrum and structure of $B_c$ mesons on the light-front Shuo Tang, Yang Li, Pieter Maris, James Vary Recent measurements at LHC have renewed the theoretical interest in the production, spectrum and decay of charm-beauty ($B_c$) mesons. We solve for the low-lying $(b\bar{c})$ states using a light-front Hamiltonian with a confining interaction based on AdS/QCD holography plus one-gluon exchange that gives a good description of charmonium and botomonium[1, 2]. Without adjusting any parameters we find good agreement for the ground state $B_c$ mass compared to experiment. We also discuss the spectrum below threshold, and compare our results with quark model calculations. The corresponding light-front wave functions can be used to calculate other observables such as the decays constants, distribution amplitudes, and GPDs. [1] Y. Li, P. Maris, and J.P. Vary, to appear in Phys. Rev. D; arXiv:1704.06968 [2] Y. Li, P. Maris, X. Zhao, and J.P. Vary, Phys. Lett. B \textbf{758}, 118 (2016) [Preview Abstract] |
Thursday, October 26, 2017 11:18AM - 11:30AM |
DF.00005: Exclusive Meson Photoproduction off Bound Nucleons Igor Strakovsky, William Briscoe An overview of the GW SAID group effort to analyze pion photoproduction on the neutron-target will be given. The disentangling of the isoscalar and isovector EM couplings of N$\ast $ and $\Delta \ast $ resonances does require compatible data on both proton and neutron targets. The final-state interactions play a critical role in the state-of-the-art analysis in extraction of the $\gamma $n $\to \quad \pi $N data from the deuteron target experiments. Then resonance couplings determined by the SAID PWA technique are compared to previous findings. The neutron program is an important component of the current JLab, MAMI-C, SPring-8, ELSA, and ELPH studies. [Preview Abstract] |
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