Exclusive ρ

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• 作者：S. Kananov ; the ZEUS Collaboration
• 刊名：Nuclear Physics B - Proceedings Supplements
• 出版年：2008
• 出版时间：November 2008
• 年：2008
• 卷：184
• 期：Complete
• 页码：252-255
• 全文大小：276 K

文摘

Exclusive ρ<sup>0sup> electroproduction at HERA has been studied with the ZEUS detector using 120 pb<sup>−1sup> of integrated luminosity collected during 1996-2000. The analysis was carried out in the kinematic range of photon virtuality 2 < Q<sup>2sup> < 160 GeV<sup>2sup> and γ<sup>*sup>p centre-of-mass energy 32 < W < 180 GeV. The results include the Q<sup>2sup> and W dependence of the γ<sup>*sup>p → ρ<sup>0sup>p cross section and the distribution of the squared-four-momentum transfer to the proton. The helicity analysis of the decay-matrix elements of the ρ<sup>0sup> was used to study the ratio of the γ<sup>*sup>p cross section for longitudinal and transverse photon as a function of Q<sup>2sup>, W and t. Finally, an effective Pomeron trajectory was extracted.