XL-Calibur – a second-generation balloon-borne hard X-ray polarimetry mission

Q. Abarr, Hisamitsu Awaki, Matthew G. Baring, R. Bose, G. De Geronimo, P. F. Dowkontt, M. Errando, V. Guarino, Koichi Hattori, Kentaro Hayashida, Fumiya Imazato, M. Ishida, Nirmal Iyer, Fabian Kislat, M. Kiss, T. Kitaguchi, H. Krawczynski, Lindsey Lisalda, Hiroto Matake, Yoshitomo Maeda, Hironori Matsumoto, Taisei Mineta, Takuya Miyazawa, Tsunefumi Mizuno, Takashi Okajima, M. Pearce, B. F. Rauch, F. Ryde, Christopher M. Shreves, Sean Spooner, T. Stana, H. Takahashi, Mai Takeo, Toru Tamagawa, Kouichi Tamura, H. Tsunemi, Nagomi Uchida, Yuusuke Uchida, Andrew West, E. Wulf, R. Yamamoto