Target and Double Spin Asymmetries of Deeply Virtual $\pi^0$ Production with a Longitudinally Polarized Proton Target and CLAS

A. Kim H. Avakian V. Burkert K. Joo W. Kim K. P. Adhikari Z. Akbar S. Anefalos Pereira R. A. Badui M. Battaglieri V. Batourine I. Bedlinskiy A. S. Biselli S. Boiarinov W. J. Briscoe W. K. Brooks S. Bültmann T. Cao D. S. Carman A. Celentano S. Chandavar G. Charles 1 T. Chetry L. Colaneri P. L. Cole N. Compton M. Contalbrigo O. Cortes V. Crede A. d'Angelo N. Dashyan R. de Vita E. de Sanctis C. Djalali H. Egiyan A. El Alaoui 2 L. El Fassi P. Eugenio G. Fedotov R. Fersch A. Filippi J. A. Fleming A. Fradi 1 M. Garçon Y. Ghandilyan G. P. Gilfoyle K. L. Giovanetti F. X. Girod W. Gohn E. Golovatch R. W. Gothe K. A. Griffioen L. Guo K. Hafidi C. Hanretty M. Hattawy 1 D. Heddle K. Hicks M. Holtrop Y. Ilieva D. G. Ireland B. S. Ishkhanov D. Jenkins H. Jiang H. S. Jo 1 S. Joosten D. Keller G. Khachatryan M. Khandaker A. Klein F. J. Klein V. Kubarovsky S. E. Kuhn S. V. Kuleshov L. Lanza P. Lenisa H. Y. Lu I . J . D. Macgregor N. Markov P. Mattione M. E. Mccracken B. Mckinnon V. Mokeev A Movsisyan E. Munevar P. Nadel-Turonski L. A. Net S. Niccolai 1 M. Osipenko A. I. Ostrovidov M. Paolone K. Park E. Pasyuk W. Phelps S. Pisano 1 O. Pogorelko J. W. Price Y. Prok M. Ripani A. Rizzo G. Rosner P. Rossi P. Roy C. Salgado R. A. Schumacher E. Seder Y. G. Sharabian Iu. Skorodumina G. D. Smith D. Sokhan N. Sparveris S. Stepanyan P. Stoler I. I. Strakovsky S. Strauch V. Sytnik M. Taiuti B. Torayev M. Ungaro H. Voskanyan E. Voutier 1 D. P. Watts X. Wei L. B. Weinstein N. Zachariou L. Zana J. Zhang I. Zonta
Abstract : The target and double spin asymmetries of the exclusive pseudoscalar channel $\vec e\vec p\to ep\pi^0$ were measured for the first time in the deep-inelastic regime using a longitudinally polarized 5.9 GeV electron beam and a longitudinally polarized proton target at Jefferson Lab with the CEBAF Large Acceptance Spectrometer (CLAS). The data were collected over a large kinematic phase space and divided into 110 four-dimensional bins of $Q^2$, $x_B$, $-t$ and $\phi$. Large values of asymmetry moments clearly indicate a substantial contribution to the polarized structure functions from transverse virtual photon amplitudes. The interpretation of experimental data in terms of generalized parton distributions (GPDs) provides the first insight on the chiral-odd GPDs $\tilde{H}_T$ and $E_T$, and complement previous measurements of unpolarized structure functions sensitive to the GPDs $H_T$ and $\bar E_T$. These data provide necessary constraints for chiral-odd GPD parametrizations and will strongly influence existing theoretical handbag models.
Document type :
Journal articles
Complete list of metadatas

http://hal.in2p3.fr/in2p3-01227837
Contributor : Emmanuelle Vernay <>
Submitted on : Thursday, November 12, 2015 - 10:08:16 AM
Last modification on : Tuesday, May 22, 2018 - 9:48:10 PM

Links full text

Identifiers

Collections

Citation

A. Kim, H. Avakian, V. Burkert, K. Joo, W. Kim, et al.. Target and Double Spin Asymmetries of Deeply Virtual $\pi^0$ Production with a Longitudinally Polarized Proton Target and CLAS. Physics Letters B, Elsevier, 2017, 768, pp.168-173. ⟨10.1016/j.physletb.2017.02.032⟩. ⟨in2p3-01227837⟩

Share

Metrics

Record views

173