[1] Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94301 USA
[2] Univ Grenoble Alpes, CNRS, Lab Phys Subatom & Cosmol, IN2P3, F-38026 Grenoble, France
[3] So Methodist Univ, Dallas, TX 75275 USA
[4] Johannes Gutenberg Univ Mainz, Inst Phys, PRISMA Cluster Excellence, D-55099 Mainz, Germany
[5] Univ Cape Town, Ctr Theoret & Math Phys, ZA-7700 Rondebosch, South Africa
[6] Univ Cape Town, Dept Phys, ZA-7700 Rondebosch, South Africa
[7] Lawrence Livermore Natl Lab, Nucl & Chem Sci Div, Livermore, CA 94551 USA
[8] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA