近阈值下质子和氘核光生$\phi$介子的自旋密度矩阵元测量
核实验
2010-08-09 v2 核理论
摘要
LEPS/SPring-8实验对、和在前向产生角的自旋密度矩阵元进行了全面测量。使用=1.6-2.4 GeV的线偏振光子束产生介子。自然宇称的坡密子交换过程在近阈值处仍然占主导地位。在核子产生中可观察到赝标量交换的非自然宇称过程，但在氘核的相干产生中该过程显著减弱。没有强烈的依赖性，但存在一定的动量转移依赖性。观测到反映道螺旋度守恒破坏振幅的自旋密度矩阵元具有小而有限的值。
引用
@article{arxiv.1006.4197,
title = {Measurement of Spin-Density Matrix Elements for $\phi$-Meson Photoproduction from Protons and Deuterons Near Threshold},
author = {W. C. Chang and D. S. Ahn and J. K. Ahn and H. Akimune and Y. Asano and S. Daté and H. Ejiri and H. Fujimura and M. Fujiwara and S. Fukui and H. Hasegawa and K. Hicks and K. Horie and T. Hotta and K. Imai and T. Ishikawa and T. Iwata and Y. Kato and H. Kawai and K. Kino and H. Kohri and N. Kumagai and P. J. Lin and S. Makino and T. Matsuda and T. Matsumura and N. Matsuoka and T. Mibe and M. Miyabe and Y. Miyachi and N. Muramatsu and T. Nakano and M. Niiyama and M. Nomachi and Y. Ohashi and H. Ohkuma and T. Ooba and D. S. Oshuev and C. Rangacharyulu and A. Sakaguchi and P. M. Shagin and Y. Shiino and H. Shimizu and Y. Sugaya and M. Sumihama and Y. Toi and H. Toyokawa and M. Uchida and A. Wakai and C. W. Wang and S. C. Wang and K. Yonehara and T. Yorita and M. Yoshimura and M. Yosoi and R. G. T. Zegers},
journal= {arXiv preprint arXiv:1006.4197},
year = {2010}
}
备注
25 pages, 14 figures