Electroproduction of Eta Mesons in the S11(1535) Resonance Region at   High Momentum Transfer

M. M. Dalton; G. S. Adams; A. Ahmidouch; T. Angelescu; J. Arrington,; R. Asaturyan; O. K. Baker; N. Benmouna; C. Bertoncini; W. U. Boeglin; P. E.; Bosted; H. Breuer; M. E. Christy; S. H. Connell; Y. Cui; S. Danagoulian; D.; Day; T. Dodario; J. A. Dunne; D. Dutta; N. El Khayari; R. Ent; H. C. Fenker,; V. V. Frolov; L. Gan; D. Gaskell; K. Hafidi; W. Hinton; R. J. Holt; T. Horn,; G. M. Huber; E. Hungerford; X. Jiang; M. K. Jones; K. Joo; N. Kalantarians,; J. J. Kelly; C. E. Keppel; V. Kubarovsky; Y. Li; Y. Liang; S. Malace; P.; Markowitz; P. McKee; D. G. Meekins; H. Mkrtchyan; B. Moziak; T. Navasardyan,; G. Niculescu; I. Niculescu; A. K. Opper; T. Ostapenko; P. E. Reimer; J.; Reinhold; J. Roche; S. E. Rock; E. Schulte; E. Segbefia; C. Smith; G. R.; Smith; P. Stoler; V. Tadevosyan; L. Tang; V. Tvaskis; M. Ungaro; A. Uzzle; S.; Vidakovic; A. Villano; W. F. Vulcan; M. Wang; G. Warren; F. R. Wesselmann; B.; Wojtsekhowski; S. A. Wood; C. Xu; L. Yuan; X. Zheng; H. Zhu

arXiv:0804.3509·hep-ex·December 30, 2009

Electroproduction of Eta Mesons in the S11(1535) Resonance Region at High Momentum Transfer

M. M. Dalton, G. S. Adams, A. Ahmidouch, T. Angelescu, J. Arrington,, R. Asaturyan, O. K. Baker, N. Benmouna, C. Bertoncini, W. U. Boeglin, P. E., Bosted, H. Breuer, M. E. Christy, S. H. Connell, Y. Cui, S. Danagoulian, D., Day, T. Dodario, J. A. Dunne, D. Dutta, N. El Khayari

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TL;DR

This study measures eta meson electroproduction at high momentum transfer near the S11(1535) resonance, providing insights into the transition amplitude and potential signs of perturbative QCD effects at elevated Q2 values.

Contribution

It presents the highest Q2 measurement of eta electroproduction in the resonance region and extracts the helicity amplitude, exploring QCD scaling behavior.

Findings

01

First high-Q2 measurement of eta electroproduction in this region

02

Helicity amplitude A_1/2 begins to scale as 1/Q3

03

Possible indication of perturbative QCD dominance at Q2 ~ 5 GeV^2

Abstract

The differential cross-section for the process p(e,e'p)eta has been measured at Q2 ~ 5.7 and 7.0 (GeV/c)2 for centre-of-mass energies from threshold to 1.8 GeV, encompassing the S11(1535) resonance, which dominates the channel. This is the highest momentum transfer measurement of this exclusive process to date. The helicity-conserving transition amplitude A_1/2, for the production of the S11(1535) resonance, is extracted from the data. Within the limited Q2 now measured, this quantity appears to begin scaling as 1/Q3 - a predicted, but not definitive, signal of the dominance of perturbative QCD, at Q2 ~ 5 (GeV/c)2.

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