Diffractive exclusive electroproduction of ϱ0 mesons at HERMES

✍ Scribed by A. Airapetian

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 439 KB
• Volume: 126
• Category: Article
• ISSN: 0920-5632
• DOI: 10.1016/s0920-5632(03)02336-3

✦ Synopsis

Recent HERMES measurements are presented on the diffractive slopes of the coherent and incoherent part of the cross section for exclusive diffractive production of p" mesons. Based on data taken with a variety of targets, 'H, 2H,3He,14N, 20Ne and Krypton, the method to extract the coherent-to-incoherent cross section ratios in dependence of the coherence length I, and momentum transfer Q2 is presented. These measurements provide important information about the interaction of quark-antiquark pairs with the nuclear medium.

Using 'H and 14N targets, the nuclear transparency and coherent cross section ratio of p" production has been measured versus coherence length and Q2 The data have been checked for a possible onset of color transparency and are compared with recent theoretical predictions.