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Exclusive $\rho^0$ production in deep inelastic electron - proton scattering at HERA
- Publication Year :
- 1995
-
Abstract
- 17 pp. (1995).<br />The exclusive production of ϱ 0 mesons in deep inelastic electron-proton scattering has been studied using the ZEUS detector. Cross sections have been measured in the range 7 < Q 2 < 25 GeV 2 for λ ∗ p centre of mass (c.m.) energies 40 to 130 GeV. The λ ∗ p → ϱ 0 p cross section exhibits a Q −(4.2±0.8 −0.5 +1.4 ) dependence and both longitudinally and transversely polarised ϱ 0 's are observed. The λ ∗ p → ϱ 0 p cross section rises strongly with increasing c.m. energy, when compared with NMC data at lower energy, which cannot be explained by production through soft pomeron exchange. The data are compared with perturbative QCD calculations where the rise in the cross section reflects the increase in the gluon density at low x .
- Subjects :
- electron p [deep inelastic scattering]
(pi+ pi-) [mass spectrum]
momentum transfer [channel cross section]
deep inelastic scattering: electron p
rho(770)0 [electroproduction]
electron p: exclusive reaction
channel cross section: energy dependence
colliding beams [electron p]
electroproduction [rho(770)0]
hadronic decay [rho(770)0]
electroproduction: rho(770)0
electron p [colliding beams]
energy dependence [channel cross section]
exclusive reaction [electron p]
colliding beams: electron p
DESY HERA Stor
electron p: colliding beams
rho(770)0: photoproduction
photon p --> p rho(770)0
(pi+ pi-): mass spectrum
channel cross section: momentum transfer
mass spectrum [(pi+ pi-)]
x-dependence [channel cross section]
electron p: deep inelastic scattering
perturbation theory [quantum chromodynamics]
rho(770)0 [photoproduction]
296 GeV-cms
photoproduction: rho(770)0
electron p --> p rho(770)0 electron
momentum spectrum [gluon]
spectrum: transverse momentum
rho(770)0 [hadronic decay]
ddc:530
quantum chromodynamics: perturbation theory
rho(770)0: electroproduction
rho(770)0: hadronic decay
channel cross section: x-dependence
mass spectrum: (pi+ pi-)
gluon: momentum spectrum
ZEUS
transverse momentum [spectrum]
photoproduction [rho(770)0]
transverse momentum: spectrum
deep inelastic scattering [electron p]
spectrum [transverse momentum]
hadronic decay: rho(770)0
experimental results
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....fe20dd0c2cfcfa13e8a02fcdec188f96
- Full Text :
- https://doi.org/10.3204/PUBDB-2023-00843