Precise Measurements of Beam Spin Asymmetries in Semi-Inclusive $\pi^0$   production

M. Aghasyan; H. Avakian; P. Rossi; E. De Sanctis; D. Hasch; M.; Mirazita; D. Adikaram; M.J. Amaryan; M. Anghinolfi; H. Baghdasaryan; J. Ball,; M. Battaglieri; V. Batourine; I. Bedlinskiy; R. P. Bennett; A.S. Biselli; D.; Branford; W.J. Briscoe; S. B\"ultmann; V.D. Burkert; D.S. Carman; S.; Chandavar; P.L. Cole; P. Collins; M. Contalbrigo; V. Crede; A. D'Angelo; A.; Daniel; N. Dashyan; R. De Vita; A. Deur; B. Dey; R. Dickson; C. Djalali; G.E.; Dodge; D. Doughty; R. Dupre; H. Egiyan; A. El Alaoui; L. Elouadrhiri; P.; Eugenio; G. Fedotov; S. Fegan; A. Fradi; M.Y. Gabrielyan; M. Gar\c{c}on; N.; Gevorgyan; G.P. Gilfoyle; K.L. Giovanetti; F.X. Girod; J.T. Goetz; W. Gohn,; E. Golovatch; R.W. Gothe; L. Graham; K.A. Griffioen; B. Guegan; M. Guidal; N.; Guler; L. Guo; K. Hafidi; C. Hanretty; K. Hicks; M. Holtrop; C.E. Hyde; Y.; Ilieva; D.G. Ireland; E.L. Isupov; S.S. Jawalkar; D. Jenkins; H.S. Jo; K.; Joo; D. Keller; M. Khandaker; P. Khetarpal; A. Kim; W. Kimy; A. Klein; F.J.; Klein; V. Kubarovsky; S.E. Kuhn; S.V. Kuleshov; V. Kuznetsov; N.D. Kvaltine,; K. Livingston; H.Y. Lu; I .J .D. MacGregor; N. Markov; M. Mayer; J. McAndrew,; B. McKinnon; C.A. Meyer; A.M. Micherdzinska; V. Mokeev; B. Moreno; H.; Moutarde; E. Munevar; P. Nadel-Turonski; A. Ni; S. Niccolai; G. Niculescu; I.; Niculescu; M. Osipenko; A.I. Ostrovidov; M. Paolone; L. Pappalardo; R.; Paremuzyan; K. Park; S. Park; E. Pasyuk; S. Anefalos Pereira; E. Phelps; S.; Pisano; O. Pogorelko; S. Pozdniakov; J.W. Price; S. Procureur; Y. Prok; D.; Protopopescu; B.A. Raue; G. Ricco; D. Rimal; M. Ripani; G. Rosner; F.; Sabati\'e; M.S. Saini; C. Salgado; D. Schott; R.A. Schumacher; E. Seder; H.; Seraydaryan; Y.G. Sharabian; G.D. Smith; D.I. Sober; S.S. Stepanyan; S.; Stepanyan; P. Stoler; I. Strakovsky; S. Strauch; M. Taiuti; W. Tang; C.E.; Taylor; S. Tkachenko; M. Ungaro; H. Voskanyan; E. Voutier; D. Watts; L.B.; Weinstein; D.P. Weygand; M.H. Wood; L. Zana; J. Zhang; B. Zhao; Z.W. Zhao

arXiv:1106.2293·hep-ex·October 11, 2011

Precise Measurements of Beam Spin Asymmetries in Semi-Inclusive $\pi^0$ production

M. Aghasyan, H. Avakian, P. Rossi, E. De Sanctis, D. Hasch, M., Mirazita, D. Adikaram, M.J. Amaryan, M. Anghinolfi, H. Baghdasaryan, J. Ball,, M. Battaglieri, V. Batourine, I. Bedlinskiy, R. P. Bennett, A.S. Biselli, D., Branford, W.J. Briscoe, S. B\"ultmann, V.D. Burkert

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TL;DR

This study measures beam spin asymmetries in semi-inclusive neutral pion production with high precision, providing insights into the underlying spin-dependent structure of the proton.

Contribution

It offers the most precise measurements to date of the $ ext{sin} \, ext{phi}_h$ amplitude in neutral pion electroproduction, enhancing understanding of spin asymmetries in semi-inclusive deep-inelastic scattering.

Findings

01

Significant $ ext{sin} \, ext{phi}_h$ amplitude observed

02

Dependence on Bjorken $x$ and pion transverse momentum characterized

03

Results compared with theoretical model calculations

Abstract

We present studies of single-spin asymmetries for neutral pion electroproduction in semi-inclusive deep-inelastic scattering of 5.776 GeV polarized electrons from an unpolarized hydrogen target, using the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility. A substantial $sin ϕ_{h}$ amplitude has been measured in the distribution of the cross section asymmetry as a function of the azimuthal angle $ϕ_{h}$ of the produced neutral pion. The dependence of this amplitude on Bjorken $x$ and on the pion transverse momentum is extracted with significantly higher precision than previous data and is compared to model calculations.

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