We present precision measurements of the target and beam-target spin asymmetries from neutral pion electroproduction in deep-inelastic scattering (DIS) using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. We scattered 6-GeV, longitudinally polarized electrons off longitudinally polarized protons in a cryogenic 14NH3 target, and extracted double and single target spin asymmetries for ep→e′π0X in multidimensional bins in four-momentum transfer (1.0<Q2<3.2 GeV2), Bjorken-x (0.12<x<0.48), hadron energy fraction (0.4<z<0.7), transverse pion momentum (0<PT<1.0 GeV), and azimuthal angle ϕh between the lepton scattering and hadron production planes. We extracted asymmetries as a function of both x and PT, which provide access to transverse-momentum distributions of longitudinally polarized quarks. The double spin asymmetries depend weakly on PT. The sin⁡2ϕh moments are zero within uncertainties, which is consistent with the expected suppression of the Collins fragmentation function. The observed sin⁡ϕh moments suggest that quark gluon correlations are significant at large x.

Jawalkar, S., Koirala, S., Avakian, H., Bosted, P., Griffioen, K.a., Keith, C., et al. (2018). Semi-inclusive π0 target and beam-target asymmetries from 6 GeV electron scattering with CLAS. PHYSICS LETTERS. SECTION B, 782, 662-667 [10.1016/j.physletb.2018.06.014].

Semi-inclusive π0 target and beam-target asymmetries from 6 GeV electron scattering with CLAS

Colaneri, L.;D'Angelo, A.;Lanza, L.;Pisano, S.;Rizzo, A.;
2018-07-10

Abstract

We present precision measurements of the target and beam-target spin asymmetries from neutral pion electroproduction in deep-inelastic scattering (DIS) using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. We scattered 6-GeV, longitudinally polarized electrons off longitudinally polarized protons in a cryogenic 14NH3 target, and extracted double and single target spin asymmetries for ep→e′π0X in multidimensional bins in four-momentum transfer (1.0
10-lug-2018
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/04 - FISICA NUCLEARE E SUBNUCLEARE
English
Con Impact Factor ISI
Collins fragmentation; Double spin asymmetries; Semi-inclusive deep-inelastic scattering; Single spin asymmetries; Transverse momentum distributions; Nuclear and High Energy Physics
CLAS Collaboration
http://www.sciencedirect.com/science/journal/03702693
Jawalkar, S., Koirala, S., Avakian, H., Bosted, P., Griffioen, K.a., Keith, C., et al. (2018). Semi-inclusive π0 target and beam-target asymmetries from 6 GeV electron scattering with CLAS. PHYSICS LETTERS. SECTION B, 782, 662-667 [10.1016/j.physletb.2018.06.014].
Jawalkar, S; Koirala, S; Avakian, H; Bosted, P; Griffioen, Ka; Keith, C; Kuhn, Se; Adhikari, Kp; Adhikari, S; Adikaram, D; Akbar, Z; Amaryan, Mj; Anef...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/207319
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