Journal Article FZJ-2018-04550

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Exclusive photoproduction of π 0 up to large values of Mandelstam variables s , t , and u with CLAS

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2018
Inst. Woodbury, NY

Physical review / C 98(1), 015207 () [10.1103/PhysRevC.98.015207]

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Abstract: Exclusive photoproduction cross sections have been measured for the process γp→pπ0[e+e−(γ)] with the Dalitz decay final state using tagged photon energies in the range of Eγ=1.275–5.425 GeV. The complete angular distribution of the final state π0, for the entire photon energy range up to large values of t and u, has been measured for the first time. The data obtained show that the cross section dσ/dt, at mid to large angles, decreases with energy as s−6.89±0.26. This is in agreement with the perturbative QCD quark counting rule prediction of s−7. Paradoxically, the size of angular distribution of measured cross sections is greatly underestimated by the QCD-based generalized parton distribution mechanism at highest available invariant energy s=11GeV2. At the same time, the Regge-exchange-based models for π0 photoproduction are more consistent with experimental data.

Classification:

Contributing Institute(s):
  1. Experimentelle Hadronstruktur (IKP-1)
Research Program(s):
  1. 6G12 - FAIR (POF3-624) (POF3-624)

Appears in the scientific report 2018
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Medline ; Creative Commons Attribution CC BY 4.0 ; SCOAP3 OpenAccess ; OpenAccess ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection
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 Record created 2018-07-26, last modified 2023-02-17