Study of Photon Dissociation in Diffractive Photoproduction at HERA
| dc.creator | ZEUS Collaboration | |
| dc.creator | al, M. Derrick et | |
| dc.date | 1997-04-17 | |
| dc.date.accessioned | 2026-07-07T11:46:46Z | |
| dc.date.available | 2026-07-07T11:46:46Z | |
| dc.description | Diffractive dissociation of quasi-real photons at a photon-proton centre of mass energy of W ~ 200 GeV is studied with the ZEUS detector at HERA. The process under consideration is gamma p -> X N, where X is the diffractively dissociated photon system of mass M_X and N is either a proton or a nucleonic system with mass M_N < 2GeV. The cross section for this process in the interval 3 < M_X < 24 GeV relative to the total photoproduction cross section was measured to be sigma^partial_D / sigma_tot = 6.2 +- 0.2(stat) +- 1.4(syst)%. After extrapolating this result to the mass interval of m_phi^2 < M_X^2 < 0.05 W^2 and correcting it for proton dissociation, the fraction of the total cross section attributed to single diffractive photon dissociation, gamma p -> X p, is found to be sigma_SD / sigma_tot = 13.3 +- 0.5(stat) +- 3.6(syst)%. The mass spectrum of the dissociated photon system in the interval 8 < M_X < 24 GeV can be described by the triple pomeron (PPP) diagram with an effective pomeron intercept of alpha_P(0) = 1.12 +- 0.04(stat) +- 0.08(syst). The cross section for photon dissociation in the range 3 < M_X < 8 GeV is significantly higher than that expected from the triple pomeron amplitude describing the region 8 < M_X < 24 GeV. Assuming that this discrepancy is due to a pomeron-pomeron-reggeon (PPR) term, its contribution to the diffractive cross section in the interval 3 < M_X < 24 GeV is estimated to be f_PPR = 26 +- 3(stat) +- 12(syst)%. | |
| dc.description | 29 pages including 9 figures | |
| dc.identifier | https://arxiv.org/abs/hep-ex/9704008 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/9704008 | |
| dc.identifier | Z.Phys.C75:421-435,1997 | |
| dc.identifier | doi:10.1007/s002880050485 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/202339 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Study of Photon Dissociation in Diffractive Photoproduction at HERA | |
| dc.type | text |