نتایج جستجو برای: generalized parton distribution

تعداد نتایج: 766164  

2002
Pasquale di Nezza Riccardo Fabbri

Exclusive electroproduction of π+π− pairs off hydrogen and deuterium targets has been studied with the HERMES experiment. The angular distribution of the π+ in the π+π− rest system has been studied in the invariant mass range 0.3 < mππ < 1.5 GeV. Theoretical models derived in the framework of the Generalized Parton Distributions show that this angular distribution receives only contributions fr...

2007
A. V. RADYUSHKIN

■ Abstract This review explains why generalized parton distributions and the related quantum phase-space distributions are useful in exploring the quark and gluon structure of the proton and neutron. It starts with the physics of form factors and parton distributions. Then quantum phase-space distributions and their offspring are discussed. The properties of generalized parton distributions are...

Journal: :Physical review letters 2012
Xiangdong Ji Xiaonu Xiong Feng Yuan

We present a systematic study of the proton spin structure in terms of measurable parton distributions. For a transversely polarized proton, we derive a polarization sum rule from the leading generalized parton distributions appearing in hard exclusive processes. For a longitudinally polarized proton, we obtain a helicity decomposition from well-known quark and gluon helicity distributions and ...

Journal: :Physical review letters 2015
E Seder A Biselli S Pisano S Niccolai G D Smith K Joo K Adhikari M J Amaryan M D Anderson S Anefalos Pereira H Avakian M Battaglieri I Bedlinskiy J Bono S Boiarinov P Bosted W Briscoe J Brock W K Brooks S Bültmann V D Burkert D S Carman C Carlin A Celentano S Chandavar G Charles L Colaneri P L Cole M Contalbrigo D Crabb V Crede A D'Angelo N Dashyan R De Vita E De Sanctis A Deur C Djalali D Doughty R Dupre L El Fassi L Elouadrhiri P Eugenio G Fedotov S Fegan A Filippi J A Fleming A Fradi B Garillon M Garçon N Gevorgyan Y Ghandilyan K L Giovanetti F X Girod J T Goetz W Gohn R W Gothe K A Griffioen B Guegan M Guidal L Guo K Hafidi H Hakobyan C Hanretty N Harrison M Hattawy N Hirlinger Saylor M Holtrop S M Hughes Y Ilieva D G Ireland B S Ishkhanov E L Isupov H S Jo S Joosten C D Keith D Keller G Khachatryan M Khandaker A Kim W Kim A Klein F J Klein S Koirala V Kubarovsky S E Kuhn P Lenisa K Livingston H Y Lu I J D MacGregor N Markov M Mayer B McKinnon D G Meekins T Mineeva M Mirazita V Mokeev R Montgomery C I Moody H Moutarde A Movsisyan C Munoz Camacho P Nadel-Turonski I Niculescu M Osipenko A I Ostrovidov M Paolone L L Pappalardo K Park S Park E Pasyuk P Peng W Phelps O Pogorelko J W Price Y Prok D Protopopescu A J R Puckett M Ripani A Rizzo G Rosner P Rossi P Roy F Sabatié C Salgado D Schott R A Schumacher I Senderovich A Simonyan I Skorodumina D Sokhan N Sparveris S Stepanyan P Stoler I I Strakovsky S Strauch V Sytnik M Taiuti W Tang Y Tian M Ungaro H Voskanyan E Voutier N K Walford D P Watts X Wei L B Weinstein M H Wood N Zachariou L Zana J Zhang I Zonta

A measurement of the electroproduction of photons off protons in the deeply inelastic regime was performed at Jefferson Lab using a nearly 6 GeV electron beam, a longitudinally polarized proton target, and the CEBAF Large Acceptance Spectrometer. Target-spin asymmetries for ep→e^{'}p^{'}γ events, which arise from the interference of the deeply virtual Compton scattering and the Bethe-Heitler pr...

2002
A. Freund

In this paper, I will explain in as simple and intuitive physical terms as possible what generalized parton distributions are, what new information about the structure of hadrons they convey and therefore what picture of the hadron will emerge. To develop this picture, I will use the example of deeply virtual Compton scattering (DVCS) and exclusive meson electroproduction processes. Based on th...

2007
Stanley J. Brodsky Felipe J. Llanes-Estrada Adam P. Szczepaniak

The Weisberger relation, an exact statement of the parton model, elegantly relates a high-energy physics observable, the 1/x moment of parton distribution functions, to a nonperturbative low-energy observable: the dependence of the nucleon mass on the value of the quark mass or its corresponding quark condensate. We show that contemporary fits to nucleon structure functions fail to determine th...

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