Transverse target single-spin asymmetry in inclusive electroproduction of charged pions and kaons

Single-spin asymmetries were investigated in inclusive electroproduction of charged pions and kaons from transversely polarized protons at the HERMES experiment. The asymmetries were studied as a function of the azimuthal angle psi about the beam direction between the target-spin direction and the hadron production plane, the transverse hadron momentum P-T relative to the direction of the incident beam, and the Feynman variable x(F). The sin psi* amplitudes are positive for pi(+) and K+ slightly negative for pi(-) and consistent with zero for K-, with particular P-T but weak x(F) dependences. Especially large asymmetries are observed for two small subsamples of events, where also the scattered electron was recorded by the spectrometer. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.

A propósito de una posible escena ritual de caza en el abrigo de Legteitira 5 (Agüenit, Sahara Occidental)

[ES] La presencia de unos personajes humanos con grandes cabezas pintadas en uno de los paneles artísticos del abrigo de Legteitira 5 genera diversas impresiones sobre su significado. A lo extraño de la composición, hay que añadir que se trata, por el momento, de un caso único en el repertorio iconográfico del Occidente del Sahara. La hipótesis de una posible relación con cabezas enmascaradas, en el contexto simbólico de una escena ritual cinegética, pudiera acaso retenerse como argumento explicativo.

Recent HERMES results from inclusive and semi-inclusive hadron production

4th International Workshop on Transverse Polisarization Phenomena in Hard Processes (TRANSVERSITY 2014)