@article{bakker_dewitt_ji_mishchenko_2005, title={Restoring the equivalence between the light-front and manifestly covariant formalisms}, volume={72}, ISSN={["1550-2368"]}, DOI={10.1103/physrevd.72.076005}, abstractNote={We discuss a treacherous point in light-front dynamics (LFD) which should be taken into account to restore complete equivalence with the manifestly covariant formalism. We present examples that require an inclusion of the arc contribution in the light-front energy contour integration in order to achieve the equivalence between the LFD result and the manifestly covariant result.}, number={7}, journal={PHYSICAL REVIEW D}, author={Bakker, BLG and DeWitt, MA and Ji, CR and Mishchenko, Y}, year={2005}, month={Oct} }
 @article{dewitt_choi_ji_2005, title={Scalar mesons in the light-front quark model}, volume={36}, ISSN={["1432-5411"]}, DOI={10.1007/s00601-004-0082-y}, number={1-4}, journal={FEW-BODY SYSTEMS}, author={DeWitt, MA and Choi, HM and Ji, CR}, year={2005}, month={Jun}, pages={83–86} }
 @article{dewitt_choi_ji_2003, title={Radiative scalar meson decay in the light-front quark model}, volume={68}, ISSN={["2470-0029"]}, DOI={10.1103/physrevd.68.054026}, abstractNote={We construct a relativistic ${}^{3}{P}_{0}$ wave function for scalar mesons within the framework of the light-front quark model (LFQM). This scalar wave function is used to perform relativistic calculations of absolute widths for the radiative decay processes ${(0}^{++})\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma},$ ${(0}^{++})\ensuremath{\rightarrow}\ensuremath{\varphi}\ensuremath{\gamma},$ and ${(0}^{++})\ensuremath{\rightarrow}\ensuremath{\rho}\ensuremath{\gamma}$ which incorporate the effects of glueball-$q\overline{q}$ mixing. The mixed physical states are assumed to be ${f}_{0}(1370),$ ${f}_{0}(1500),$ and ${f}_{0}(1710)$ for which the flavor-glue content is taken from the mixing calculations of other works. Since experimental data for these processes are poor, our results are compared with those of a recent non-relativistic model calculation. We find that while the relativistic corrections introduced by the LFQM reduce the magnitudes of the decay widths by 50\char21{}70 %, the relative strengths between different decay processes are fairly well preserved. We also calculate decay widths for the processes $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\varphi}}{(0}^{++})\ensuremath{\gamma}$ and ${(0}^{++})\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}$ involving the light scalars ${f}_{0}(980)$ and ${a}_{0}(980)$ to test the simple $q\overline{q}$ model of these mesons. Our results of the $q\overline{q}$ model for these processes are not consistent with well-established data, further supporting the idea that ${f}_{0}(980)$ and ${a}_{0}(980)$ are not conventional $q\overline{q}$ states.}, number={5}, journal={PHYSICAL REVIEW D}, author={DeWitt, MA and Choi, HM and Ji, CR}, year={2003}, month={Sep} }