Measurement of spin-density matrix elements for φ-meson photoproduction from protons and deuterons near threshold

Measurement of spin-density matrix elements for φ-meson photoproduction from protons and deuterons near threshold
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DOI：
10.1103/physrevc.82.015205
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发表时间：
2010-06
期刊：
Physical Review C
影响因子：
3.1
通讯作者：
We-Fu Chang;D. S. Ahn;D. S. Ahn;J. K. Ahn;H. Akimune;Y. Asano;S. Dat'e;H. Ejiri;H. Fujimura;M. Fujiwara;M. Fujiwara;S. Fukui;S. Hasegawa;K. Hicks;K. Horie;T. Hotta;K. Imai;Takatsugu Ishikawa;T. Iwata;Y. Kato;H. Kawai;K. Kino;H. Kohri;N. Kumagai;P. Lin;S. Makino;T. Matsuda;T. Matsumura;N. Matsuoka;T. Mibe;M. Miyabe;Y. Miyachi;N. Muramatsu;T. Nakano;M. Niiyama;M. Nomachi;Y. Ohashi;H. Ohkuma;T. Ooba;D. Oshuev;C. Rangacharyulu;A. Sakaguchi;P. Shagin;Y. Shiino;H. Shimizu;Y. Sugaya;M. Sumihama;Y. Toi;H. Toyokawa;M. Uchida;A. Wakai;Chun-Chieh Wang;S. C. Wang;K. Yonehara;T. Yorita;M. Yoshimura;M. Yosoi;R. Zegers
We-Fu Chang;D. S. Ahn;D. S. Ahn;J. K. Ahn;H. Akimune;Y. Asano;S. Dat'e;H. Ejiri;H. Fujimura;M. Fujiwara;M. Fujiwara;S. Fukui;S. Hasegawa;K. Hicks;K. Horie;T. Hotta;K. Imai;Takatsugu Ishikawa;T. Iwata;Y. Kato;H. Kawai;K. Kino;H. Kohri;N. Kumagai;P. Lin;S. Makino;T. Matsuda;T. Matsumura;N. Matsuoka;T. Mibe;M. Miyabe;Y. Miyachi;N. Muramatsu;T. Nakano;M. Niiyama;M. Nomachi;Y. Ohashi;H. Ohkuma;T. Ooba;D. Oshuev;C. Rangacharyulu;A. Sakaguchi;P. Shagin;Y. Shiino;H. Shimizu;Y. Sugaya;M. Sumihama;Y. Toi;H. Toyokawa;M. Uchida;A. Wakai;Chun-Chieh Wang;S. C. Wang;K. Yonehara;T. Yorita;M. Yoshimura;M. Yosoi;R. Zegers
中科院分区：
物理与天体物理2区
文献类型：
--
作者：
We-Fu Chang;D. S. Ahn;D. S. Ahn;J. K. Ahn;H. Akimune;Y. Asano;S. Dat'e;H. Ejiri;H. Fujimura;M. Fujiwara;M. Fujiwara;S. Fukui;S. Hasegawa;K. Hicks;K. Horie;T. Hotta;K. Imai;Takatsugu Ishikawa;T. Iwata;Y. Kato;H. Kawai;K. Kino;H. Kohri;N. Kumagai;P. Lin;S. Makino;T. Matsuda;T. Matsumura;N. Matsuoka;T. Mibe;M. Miyabe;Y. Miyachi;N. Muramatsu;T. Nakano;M. Niiyama;M. Nomachi;Y. Ohashi;H. Ohkuma;T. Ooba;D. Oshuev;C. Rangacharyulu;A. Sakaguchi;P. Shagin;Y. Shiino;H. Shimizu;Y. Sugaya;M. Sumihama;Y. Toi;H. Toyokawa;M. Uchida;A. Wakai;Chun-Chieh Wang;S. C. Wang;K. Yonehara;T. Yorita;M. Yoshimura;M. Yosoi;R. Zegers

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LEPS/Spring-8实验全面测量了Gammap-&gt；PhIP、Gammad-&gt；phipn和Gammad-&gt；phid在正向生产角度的自旋密度矩阵元。用E{subg}Amma=1.6-2.4GeV的线偏振光子束产生Phi介子。在阈值附近，自然宇称的庞美子交换过程仍然占主导地位。赝标交换的非自然宇称过程在核子的产生中是可见的，但在重离子的相干产生中大大减少。不存在很强的E{subg}Amma依赖关系，但对动量转移有一定依赖关系。观测到了反映t通道中螺旋度非守恒振幅的自旋密度矩阵元的一个很小但有限的值。
The LEPS/SPring-8 experiment made a comprehensive measurement of the spin-density matrix elements for gammap->phip, gammad->phipn, and gammad->phid at forward production angles. A linearly polarized photon beam at E{sub g}amma=1.6-2.4 GeV was used for the production of phi mesons. The natural-parity Pomeron exchange processes remain dominant near threshold. The unnatural-parity processes of pseudoscalar exchange is visible in the production from the nucleons but is greatly reduced in the coherent production from deuterons. There is no strong E{sub g}amma dependence, but there is some dependence on momentum transfer. A small but finite value of the spin-density matrix elements reflecting helicity-nonconserving amplitudes in the t-channel is observed.