First Measurement of the Gerasimov-Drell-Hearn Sum Rule for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">H</mml:mi><mml:mprescripts /><mml:none /><mml:mn>1</mml:mn></mml:mmultiscripts></mml:math>from 0.7 to 1.8 GeV at ELSA

Dutz, H.; Helbing, K.; Krimmer, J.; Speckner, T.; Zeitler, G.; Ahrens, J.; Altieri, S.; Annand, J. R. M.; Anton, G.; Arends, H. J.; Beck, R.; Böck, Andreas; Bradtke, C.; Braghieri, A.; Drachenfels, W. von; Frommberger, F.; Gódo, M.; Goertz, Stefan; Grabmayr, P.; Hasegawa, S.; Hansen, Kurt Schaldemose; Harmsen, J.; Heid, E.; Hillert, W.; Holvoet, H.; Horikawa, N.; Iwata, T.; Hoorebeke, Luc Van; d’Hose, N.; Jennewein, P.; Kiel, B.; Клейн, Ф.; Kondratiev, R.; Lang, Μ.; Lannoy, B.; Leukel, R.; Lisin, V.; Menze, D.; Meyer, W.; Michel, Thilo; Naumann, J.; Panzeri, A.; Pedroni, P.; Pinelli, T.; Preobrajenski, I.; Radtke, Edgar; Reicherz, G.; Rohlof, Ch.; Rostomyan, T.; Sauer, Michelle; Schoch, B.; Schumacher, M.; Tamas, G.; Thomas, A.; Vyver, R. Van de; Weihofen, W.; Zapadtka, F.

doi:10.1103/physrevlett.91.192001

Cited by 88 publications

(52 citation statements)

References 22 publications

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“…Our results are compared to χ PT calculations (as in Fig. 35), the MAID parametrization for single-pion production, and real photon data at Q 2 = 0 from MAMI [141][142][143]. It may still be possible, however, for global duality to apply in the resonance region at relatively low Q 2 .…”

Section: Higher Twist Analysismentioning

confidence: 99%

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Determination of the proton spin structure functions for 0.05<Q2<5GeV2 using CLAS

Fersch¹,

Guler²,

Bosted³

et al. 2017

Phys. Rev. C

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We present the results of our final analysis of the full data set of g p 1 (Q 2 ), the spin structure function of the proton, collected using CLAS at Jefferson Laboratory in [2000][2001] We compare our final results with various theoretical models and expectations, as well as with parametrizations of the world data. Our data, with their precision and dense kinematic coverage, are able to constrain fits of polarized parton distributions, test pQCD predictions for quark polarizations at large x, offer a better understanding of quark-hadron duality, and provide more precise values of higher twist matrix elements in the framework of the operator product expansion.

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Section: Higher Twist Analysismentioning

confidence: 99%

“…The polarizability in units of fm −4 is plotted in Fig. 38 (blue open circles, measured data; blue dots, extrapolated data), along with the real photon γ p 0 (Q 2 = 0) obtained from the MAMI GDH experiment [141][142][143]:…”

Section: Modelsmentioning

confidence: 99%

Determination of the proton spin structure functions for 0.05<Q2<5GeV2 using CLAS

Fersch¹,

Guler²,

Bosted³

et al. 2017

Phys. Rev. C

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“…The data points for the proton γ 0 at finite Q 2 are from Ref. [51] (blue dots), and at Q 2 = 0 from [52] (purple square). For the neutron all the data are from Ref.…”

Section: Nucleon Vvcs and Generalised Polarisabilities In Bχptmentioning

confidence: 99%

Polarisabilities of the nucleon in baryon chiralperturbation theory and beyond

Lensky¹,

Pascalutsa²

2020

Proceedings of the 9th International Workshop on Chiral Dynamics — PoS(CD2018)

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We review the recent baryon chiral perturbation theory results for the nucleon polarisabilities that describe the different regimes of nucleon Compton scattering -real, virtual, and doubly virtual. We stress the importance of the empirical verification of the theory in the context of the calculation of the inelastic nucleon structure corrections, such as the two-photon exchange contributions. We also discuss the recently obtained constraints that relate the different regimes of nucleon Compton scattering and can provide additional information on the nucleon structure.

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“…The experimental program at the Crystal Barrel detector was focused on the measurement of single and double polarization observables off polarized nucleons using the existing GDH frozen spin target [11,12], which with the start of the CRC16 has been labeled as 'CB frozen spin target'. Here we will briefly report on the setup and the performance of the 'CB frozen spin target' at the Crystal Barrel detector for polarization experiments at ELSA in the reporting period of CRC16.…”

Section: Introductionmentioning

confidence: 99%

Polarized Solid State Target

2017

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Abstract. The polarized solid state target is an indispensable experimental tool to study single and double polarization observables at low intensity particle beams like tagged photons. It was one of the major components of the Crystal-Barrel experiment at ELSA. Besides the operation of the 'CB frozen spin target' within the experimental program of the Crystal-Barrel collaboration both collaborative groups of the D1 project, the polarized target group of the Ruhr Universität Bochum and the Bonn polarized target group, have made significant developments in the field of polarized targets within the CRC16. The Bonn polarized target group has focused its work on the development of technically challenging polarized solid target systems towards the so called '4π continuous mode polarized target' to operate them in combination with 4π-particle detection systems. In parallel, the Bochum group has developed various highly polarized deuterated target materials and high precision NMR-systems, in the meantime used for polarization experiments at CERN, JLAB and MAMI, too.

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First Measurement of the Gerasimov-Drell-Hearn Sum Rule forH1from 0.7 to 1.8 GeV at ELSA

Cited by 88 publications

References 22 publications

Determination of the proton spin structure functions for 0.05<Q2<5GeV2 using CLAS

Determination of the proton spin structure functions for 0.05<Q2<5GeV2 using CLAS

Polarisabilities of the nucleon in baryon chiralperturbation theory and beyond

Polarized Solid State Target

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