arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0808.0669hep-ex
收藏

HERMES衍射$ϕ$介子产生的自旋密度矩阵元

Spin Density Matrix Elements from diffractive $ϕ$ meson production at HERMES

HERMES Collaboration, W. Augustyniak, A. Borissov, S. Manayenkov

摘要:

在HERMES运动学区$1 < Q^{2} < 7$ GeV、$^2$和$3.0 < W < 6.3$ GeV研究了$ϕ$介子在氢和氘靶上的排他产生.给出了自旋密度矩阵元及其与$Q^{2}$和$t$的关系。这些数据是一致的s-通道螺旋度守恒的独家$ϕ$介子生产。没有发现非自然平价交换振幅的贡献的重要证据。

英文摘要:

Exclusive production of $ϕ$ mesons on hydrogen and deuterium targets is studied in the HERMES kinematic region $1 < Q^{2} < 7$ GeV$^2$ and $3.0 < W < 6.3$ GeV. Spin density matrix elements and their $Q^{2}$ and $t$ dependences are presented. These data are consistent with s-channel helicity conservation in exclusive $ϕ$ meson production. No significant evidence for the contribution of unnatural-parity-exchange amplitudes is found.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑