The spin structure of the nucleon

CA Aidala, SD Bass, D Hasch, GK Mallot - Reviews of Modern Physics, 2013 - APS
This article reviews our present understanding of QCD spin physics: the proton spin puzzle
and new developments aimed at understanding the transverse structure of the nucleon …

Free-electron–light interactions in nanophotonics

C Roques-Carmes, SE Kooi, Y Yang, N Rivera… - Applied Physics …, 2023 - pubs.aip.org
When impinging on optical structures or passing in their vicinity, free electrons can
spontaneously emit electromagnetic radiation, a phenomenon generally known as …

Precise determination of the spin structure function of the proton, deuteron, and neutron

A Airapetian, N Akopov, Z Akopov, A Andrus… - Physical Review D …, 2007 - APS
Precise measurements of the spin structure functions of the proton g 1 p (x, Q 2) and
deuteron g 1 d (x, Q 2) are presented over the kinematic range 0.0041≤ x≤ 0.9 and 0.18 …

Single-Spin Asymmetries in Semi-Inclusive Deep-Inelastic Scattering<? format?> on a Transversely Polarized Hydrogen Target

A Airapetian, N Akopov, Z Akopov, M Amarian… - Physical review …, 2005 - APS
Single-spin asymmetries for semi-inclusive electroproduction of charged pions in deep-
inelastic scattering of positrons are measured for the first time with transverse target …

Observation of the Naive--Odd Sivers Effect in Deep-Inelastic Scattering

A Airapetian, N Akopov, Z Akopov, EC Aschenauer… - Physical review …, 2009 - APS
Azimuthal single-spin asymmetries of leptoproduced pions and charged kaons were
measured on a transversely polarized hydrogen target. Evidence for a naive-T-odd …

The HERMES polarized hydrogen and deuterium gas target in the HERA electron storage ring

Hermes Collaboration - arXiv preprint physics/0408137, 2004 - arxiv.org
The HERMES hydrogen and deuterium nuclear-polarized gas targets have been in use
since 1996 with the polarized electron beam of HERA at DESY to study the spin structure of …

Quark helicity distributions in the nucleon for up, down, and strange quarks<? format?> from semi-inclusive deep-inelastic scattering

A Airapetian, N Akopov, Z Akopov, M Amarian… - Physical Review D …, 2005 - APS
Polarized deep-inelastic scattering data on longitudinally polarized hydrogen and deuterium
targets have been used to determine double-spin asymmetries of cross sections. Inclusive …

Multiplicities of charged pions and kaons from semi-inclusive deep-inelastic scattering<? format?> by the proton and the deuteron

A Airapetian, N Akopov, Z Akopov, EC Aschenauer… - Physical Review D …, 2013 - APS
Multiplicities in semi-inclusive deep-inelastic scattering are presented for each charge state
of π±and K±mesons. The data were collected by the HERMES experiment at the HERA …

Azimuthal single-and double-spin asymmetries in semi-inclusive deep-inelastic lepton scattering by transversely polarized protons

A Airapetian, N Akopov, Z Akopov… - Journal of High Energy …, 2020 - Springer
A bstract A comprehensive set of azimuthal single-spin and double-spin asymmetries in
semi-inclusive leptoproduction of pions, charged kaons, protons, and antiprotons from …

Evidence for a narrow| S|= 1 baryon state at a mass of 1528 MeV in quasi-real photoproduction

A Airapetian, N Akopov, Z Akopov, M Amarian… - Physics Letters B, 2004 - Elsevier
Evidence for a narrow baryon state is found in quasi-real photoproduction on a deuterium
target through the decay channel pK0S→ pπ+ π−. A peak is observed in the pK0S invariant …