Study of photon dissociation in diffractive photoproduction at HERA
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 γp → XN, where X is the diffractively dissociated photon system of mass MX and N is either a proton or a nucleonic syst...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
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1997
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| _version_ | 1797102953946939392 |
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| author | Breitweg, J Derrick, M Krakauer, D Magill, S Mikunas, D Musgrave, B Repond, J Stanek, R Talaga, R Yoshida, R Zhang, H Mattingly, M Anselmo, F Antonioli, P Bari, G Basile, M Bellagamba, L Boscherini, D Bruni, A Bruni, G Cara Romeo, G Castellini, G Cifarelli, L Cindolo, F Contin, A |
| author_facet | Breitweg, J Derrick, M Krakauer, D Magill, S Mikunas, D Musgrave, B Repond, J Stanek, R Talaga, R Yoshida, R Zhang, H Mattingly, M Anselmo, F Antonioli, P Bari, G Basile, M Bellagamba, L Boscherini, D Bruni, A Bruni, G Cara Romeo, G Castellini, G Cifarelli, L Cindolo, F Contin, A |
| author_sort | Breitweg, J |
| collection | OXFORD |
| 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 γp → XN, where X is the diffractively dissociated photon system of mass MX and N is either a proton or a nucleonic system with mass MN < 2 GeV. The cross section for this process in the interval 3 < MX < 24 GeV relative to the total photoproduction cross section was measured to be σDpartial/σtot = 6.2 ± 0.2(stat) ± 1.4(syst)%. After extrapolating this result to the mass interval of mφ2 < MX2 < 0.05W2 and correcting it for proton dissociation, the fraction of the total cross section attributed to single diffractive photon dissociation, γp → Xp, is found to be σSD/σtot = 13.3 ± 0.5(stat) ± 3.6(syst)%. The mass spectrum of the dissociated photon system in the interval 8 < MX < 24 GeV can be described by the triple pomeron (IP IP IP) diagram with an effective pomeron intercept of αIP(0) = 1.12 ± 0.04(stat) ± 0.08(syst). The cross section for photon dissociation in the range 3 < MX < 8 GeV is significantly higher than that expected from the triple pomeron amplitude describing the region 8 < MX < 24 GeV. Assuming that this discrepancy is due to a pomeron-pomeron-reggeon (IP IP IR) term, its contribution to the diffractive cross section in the interval 3 < MX < 24 GeV is estimated to be fIP IP IR = 26 ± 3(stat) ± 12(syst)%. © Springer-Verlag 1997. |
| first_indexed | 2024-03-07T06:13:10Z |
| format | Journal article |
| id | oxford-uuid:f035dd54-f513-44a3-8ef6-255050886216 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T06:13:10Z |
| publishDate | 1997 |
| record_format | dspace |
| spelling | oxford-uuid:f035dd54-f513-44a3-8ef6-2550508862162022-03-27T11:46:17ZStudy of photon dissociation in diffractive photoproduction at HERAJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:f035dd54-f513-44a3-8ef6-255050886216EnglishSymplectic Elements at Oxford1997Breitweg, JDerrick, MKrakauer, DMagill, SMikunas, DMusgrave, BRepond, JStanek, RTalaga, RYoshida, RZhang, HMattingly, MAnselmo, FAntonioli, PBari, GBasile, MBellagamba, LBoscherini, DBruni, ABruni, GCara Romeo, GCastellini, GCifarelli, LCindolo, FContin, ADiffractive 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 γp → XN, where X is the diffractively dissociated photon system of mass MX and N is either a proton or a nucleonic system with mass MN < 2 GeV. The cross section for this process in the interval 3 < MX < 24 GeV relative to the total photoproduction cross section was measured to be σDpartial/σtot = 6.2 ± 0.2(stat) ± 1.4(syst)%. After extrapolating this result to the mass interval of mφ2 < MX2 < 0.05W2 and correcting it for proton dissociation, the fraction of the total cross section attributed to single diffractive photon dissociation, γp → Xp, is found to be σSD/σtot = 13.3 ± 0.5(stat) ± 3.6(syst)%. The mass spectrum of the dissociated photon system in the interval 8 < MX < 24 GeV can be described by the triple pomeron (IP IP IP) diagram with an effective pomeron intercept of αIP(0) = 1.12 ± 0.04(stat) ± 0.08(syst). The cross section for photon dissociation in the range 3 < MX < 8 GeV is significantly higher than that expected from the triple pomeron amplitude describing the region 8 < MX < 24 GeV. Assuming that this discrepancy is due to a pomeron-pomeron-reggeon (IP IP IR) term, its contribution to the diffractive cross section in the interval 3 < MX < 24 GeV is estimated to be fIP IP IR = 26 ± 3(stat) ± 12(syst)%. © Springer-Verlag 1997. |
| spellingShingle | Breitweg, J Derrick, M Krakauer, D Magill, S Mikunas, D Musgrave, B Repond, J Stanek, R Talaga, R Yoshida, R Zhang, H Mattingly, M Anselmo, F Antonioli, P Bari, G Basile, M Bellagamba, L Boscherini, D Bruni, A Bruni, G Cara Romeo, G Castellini, G Cifarelli, L Cindolo, F Contin, A Study of photon dissociation in diffractive photoproduction at HERA |
| title | Study of photon dissociation in diffractive photoproduction at HERA |
| title_full | Study of photon dissociation in diffractive photoproduction at HERA |
| title_fullStr | Study of photon dissociation in diffractive photoproduction at HERA |
| title_full_unstemmed | Study of photon dissociation in diffractive photoproduction at HERA |
| title_short | Study of photon dissociation in diffractive photoproduction at HERA |
| title_sort | study of photon dissociation in diffractive photoproduction at hera |
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