In this section
@article{Butterworth:1997:10.1007/s002880050485,
author = {Butterworth, I and Foudas, C and Long, KR and Sedgbeer},
doi = {10.1007/s002880050485},
journal = {Zeitschrift für Physik C Particles and Fields},
pages = {421--435},
title = {Study of photon dissociation in diffractive photoproduction at HERA},
url = {http://dx.doi.org/10.1007/s002880050485},
volume = {75},
year = {1997}
}
TY - JOUR
AB - Diffractive dissociation of quasi–real photons at a photon–proton centre of mass energy ofW ≈ 200 GeV is studied with the ZEUS detector at HERA. The process under considerationis γp → XN, where X is the diffractively dissociated photon system of mass MX and N iseither a proton or a nucleonic system with mass MN < 2 GeV. The cross section for this processin the interval 3 < MX < 24 GeV relative to the total photoproduction cross section wasmeasured to be σpartialD /σtot = 6.2 ± 0.2(stat) ± 1.4(syst)%. After extrapolating this result tothe mass interval of m2φ < M2X < 0.05W2 and correcting it for proton dissociation, the fractionof the total cross section attributed to single diffractive photon dissociation, γp → Xp, is foundto be σSD/σtot = 13.3 ± 0.5(stat) ± 3.6(syst)%. The mass spectrum of the dissociated photonsystem 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). Thecross section for photon dissociation in the range 3 < MX < 8 GeV is significantly higher thanthat 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 contributionto the diffractive cross section in the interval 3 < MX < 24 GeV is estimated to befIP IP IR = 26 ± 3(stat) ± 12(syst)%.
AU - Butterworth,I
AU - Foudas,C
AU - Long,KR
AU - Sedgbeer
DO - 10.1007/s002880050485
EP - 435
PY - 1997///
SN - 0170-9739
SP - 421
TI - Study of photon dissociation in diffractive photoproduction at HERA
T2 - Zeitschrift für Physik C Particles and Fields
UR - http://dx.doi.org/10.1007/s002880050485
VL - 75
ER -