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Diffractive photoproduction of rho mesons with large momentum transfer at HERA
- Source :
- Physics letters: B, Physics Letters B, Physics Letters B, Elsevier, 2006, 638, pp.422-431. ⟨10.1016/j.physletb.2006.05.042⟩, Physics Letters B, 2006, 638, pp.422-431. ⟨10.1016/j.physletb.2006.05.042⟩, Red Report (2006)., Physics letters. Section B, 638 (5-6, Physics Letters B, 638 (5-6), Physics letters / B 638, 422 (2006). doi:10.1016/j.physletb.2006.05.042
- Publication Year :
- 2006
-
Abstract
- The diffractive photoproduction of ρ mesons, e p → e ρ Y, with large momentum transfer squared at the proton vertex, |t|, is studied with the H1 detector at HERA using an integrated luminosity of 20.1 pb-1. The photon-proton centre of mass energy spans the range 75 < W < 95 GeV, the photon virtuality is restricted to Q2 < 0.01 GeV2 and the mass MY of the proton remnant is below 5 GeV. The t dependence of the cross section is measured for the range 1.5 < | t | < 10.0 GeV2 and is well described by a power law, d σ / d | t | ∝ | t |- n. The spin density matrix elements, which provide information on the helicity structure of the interaction, are extracted using measurements of angular distributions of the ρ decay products. The data indicate a violation of s-channel helicity conservation, with contributions from both single and double helicity-flip being observed. The results are compared to the predictions of perturbative QCD models.<br />Physics Letters B, 638 (5-6)<br />ISSN:0370-2693<br />ISSN:0031-9163<br />ISSN:1873-2445
- Subjects :
- Nuclear and High Energy Physics
Particle physics
Photon
Meson
Nuclear Theory
FOS: Physical sciences
7. Clean energy
01 natural sciences
Power law
High Energy Physics - Experiment
Nuclear physics
High Energy Physics - Experiment (hep-ex)
0103 physical sciences
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
ddc:530
010306 general physics
Nuclear Experiment
Physics
010308 nuclear & particles physics
Momentum transfer
Gamma ray
Perturbative QCD
HERA
Helicity
Physique des particules élémentaires
High Energy Physics::Experiment
Subjects
Details
- Language :
- English
- ISSN :
- 03702693, 00319163, and 18732445
- Database :
- OpenAIRE
- Journal :
- Physics letters: B
- Accession number :
- edsair.doi.dedup.....c39b547680cee3155415395bbaf41d1b