Measurement of the diffractive structure function F2D(3)

✍ Scribed by Christophe Royon

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 260 KB
• Volume: 79
• Category: Article
• ISSN: 0920-5632
• DOI: 10.1016/s0920-5632(99)00691-x

✦ Synopsis

Measurements of the diffractive structure function F D(3) (xl,,/3, Q2), describing the process ep ~ eXY, are presented in the two kinematic regions 0.4 < Q~ < 5, GeV z, 0.001 < fl < 0.65, and 200 < 3 < 800 GeV :, 0.4 < f~ < 0.9, both with xl, < 0.05, M r < 1.6 GeV and It[ < 1.0 GeV 2. Together with published measurements at intermediate Q2, the data are compared with models based on QCD and Regge phenomenology. The diffractive trajectory is found to have an intercept larger than that describing soft hadronic data and consistent with that determined using previously published H1 measurements at intermediate Q2 alone. The data are also parameterised using a QCD motivated model based on the exchange of two gluons from the proton. In this model, the higher twist contribution to F D(a) at large 3 is found to be important at low Q2. The data are also compared with models based on BFKL dynamics.