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 $\sin \phi_h$ amplitude has been measured in the distribution of the cross section asymmetry as a function of the azimuthal angle $\phi_h$ 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.

Aghasyan, M

Avakian, H

Rossi, P

De Sanctis, E

Hasch, D

Mirazita, M

Adikaram, D

Amaryan, MJ

Anghinolfi, M

Baghdasaryan, H

Ball, J

Battaglieri, M

Batourine, V

Bedlinskiy, I

Bennett, RP

Biselli, AS

Branford, D

Briscoe, WJ

Bueltmann, S

Burkert, VD

Carman, DS

Chandavar, S

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Collins, P

Contalbrigo, M

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Gabrielyan, MY

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Giovanetti, KL

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Goetz, JT

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Golovatch, E

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Graham, L

Griffioen, KA

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Holtrop, Maurik

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Jenkins, D

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Keller, D

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Kim, W

Klein, A

Klein, FJ

Kubarovsky, V

Kuhn, SE

Kuleshov, SV

Kuznetsov, V

Kvaltine, ND

Livingston, K

Lu, HY

MacGregor, IJD

Markov, N

Mayer, M

McAndrew, J

McKinnon, B

Meyer, CA

Micherdzinska, AM

Mokeev, V

Moreno, B

Moutarde, H

Munevar, E

Nadel-Turonski, P

Ni, A

Niccolai, S

Niculescu, G

Niculescu, I

Osipenko, M

Ostrovidov, AI

Paolone, M

Pappalardo, L

Paremuzyan, R

Park, K

Park, S

Pasyuk, E

Pereira, S Anefalos

Phelps, E

Pisano, S

Pogorelko, O

Pozdniakov, S

Price, JW

Procureur, S

Prok, Y

Protopopescu, D

Raue, BA

Ricco, G

Rimal, D

Ripani, M

Rosner, G

Sabatie, F

Saini, MS

Salgado, C

Schott, D

Schumacher, RA

Seder, E

Seraydaryan, H

Sharabian, YG

Smith, GD

Sober, DI

Stepanyan, SS

Stepanyan, S

Stoler, P

Strakovsky, I

Strauch, S

Taiuti, M

Tang, W

Taylor, CE

Tkachenko, S

Ungaro, M

Voskanyan, H

Voutier, E

Watts, D

Weinstein, LB

Weygand, DP

Wood, MH

Zana, L

Zhang, J

Zhao, B

Zhao, ZW

published 

October 25, 2011

Nuclear & Particles Physics

Physics Letters B: Nuclear Physics and Particle Physics  Journal