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Longitudinal double-spin asymmetries in semi-inclusive deep-inelastic scattering of electrons and positrons by protons and deuterons

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arxiv 1810.07054 v1 pith:WTPFDWBS submitted 2018-10-16 hep-ex hep-ph

Longitudinal double-spin asymmetries in semi-inclusive deep-inelastic scattering of electrons and positrons by protons and deuterons

HERMES Collaboration: A. Airapetian , N. Akopov , Z. Akopov , E.C. Aschenauer , W. Augustyniak , R. Avakian , A. Avetissian , S. Belostotski
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H.P. Blok A. Borissov V. Bryzgalov G.P. Capitani E. Cisbani G. Ciullo M. Contalbrigo P.F. Dalpiaz W. Deconinck R. De Leo L. De Nardo E. De Sanctis M. Diefenthaler P. Di Nezza M. D\"uren G. Elbakian F. Ellinghaus A. Fantoni L. Felawka S. Frullani G. Gavrilov V. Gharibyan F. Giordano S. Gliske D. Hasch Y. Holler A. Ivanilov H.E. Jackson S. Joosten R. Kaiser G. Karyan T. Keri E. Kinney A. Kisselev V. Korotkov V. Kozlov P. Kravchenko V.G. Krivokhijine L. Lagamba L. Lapik\'as I. Lehmann W. Lorenzon B.-Q. Ma D. Mahon S.I. Manaenkov Y. Mao B. Marianski H. Marukyan Y. Miyachi A. Movsisyan V. Muccifora A. Mussgiller Y. Naryshkin A. Nass G. Nazaryan W.-D. Nowak L.L. Pappalardo R. Perez-Benito A. Petrosyan P.E. Reimer A.R. Reolon C. Riedl K. Rith G. Rosner A. Rostomyan J. Rubin D. Ryckbosch Y. Salomatin G. Schnell B. Seitz T.-A. Shibata M. Statera E. Steffens J.J.M. Steijger S. Taroian A. Terkulov R. Truty A. Trzcinski M. Tytgat P.B. van der Nat Y. Van Haarlem C. Van Hulse D. Veretennikov V. Vikhrov I. Vilardi C. Vogel S. Wang S. Yaschenko B. Zihlmann P. Zupranski
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classification hep-ex hep-ph
keywords asymmetriesdeep-inelasticdependencedouble-spinelectronshadronlongitudinalpositrons
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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A comprehensive collection of results on longitudinal double-spin asymmetries is presented for charged pions and kaons produced in semi-inclusive deep-inelastic scattering of electrons and positrons on the proton and deuteron, based on the full HERMES data set. The dependence of the asymmetries on hadron transverse momentum and azimuthal angle extends the sensitivity to the flavor structure of the nucleon beyond the distribution functions accessible in the collinear framework. No strong dependence on those variables is observed. In addition, the hadron charge-difference asymmetry is presented, which under certain model assumptions provides access to the helicity distributions of valence quarks.

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