Deep inelastic inclusive and dfifractive scattering at Q{sup 2} values from 25 to 320 GeV{sup 2} with the ZEUS forward plug calorimeter.

Journal Article · Mon Sep 01 04:00:00 EDT 2008 · Nucl. Phys. B

DOI:https://doi.org/10.1016/j.nuclphysb.2007.08.021· OSTI ID:935292

Chekanov, S; Derrick, M; Magill, S; Musgrave, B; Nicholass, D; Repond, J; Yoshida, R

Deep inelastic scattering and its diffractive component, ep {yields} e{prime} {gamma}* p {yields} e{prime} XN, have been studied at HERA with the ZEUS detector using an integrated luminosity of 52.4 pb{sup -1}. The M{sub X} method has been used to extract the diffractive contribution. A wide range in the center-of-mass energy W(37-245 GeV), photon virtuality Q{sup 2} (20-450 GeV{sup 2}) and mass M{sub X} (0.28-35 GeV) is covered. The diffractive cross section for 2 < M{sub X} < 15 GeV rises strongly with W, the rise becoming steeper as Q{sup 2} increases. The data are also presented in terms of the diffractive structure function, F{sub 2}{sup D(3)}, of the proton. For fixed Q{sup 2} and fixed M{sub X}, xpF{sub 2}{sup D(3)} shows a strong rise as xP {yields} 0, where xp is the fraction of the proton momentum carried by the pomeron. For Bjorken-x < 1 x 10{sup -3}, xpF{sub 2}{sup D(3)} shows positive logQ{sup 2} scaling violations, while for X {ge} 5 x 10{sup -3} negative scaling violations are observed. The diffractive structure function is compatible with being leading twist. The data show that Regge factorization is broken.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 935292
• Report Number(s): ANL-HEP-PR-08-24
• Journal Information: Nucl. Phys. B, Journal Name: Nucl. Phys. B Journal Issue: 1-2 ; Sep. 1, 2008 Vol. 800
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CROSS SECTIONS
DEEP INELASTIC SCATTERING
FACTORIZATION
LUMINOSITY
PHOTONS
PROTONS
SCATTERING
STRUCTURE FUNCTIONS
X-RAY PHOTOELECTRON SPECTROSCOPY