We measured the longitudinal double spin asymmetries ALL for single hadron muoproduction off protons and deuterons at photon virtuality Q 2 < 1 (GeV/c)2 for transverse hadron momenta pT in the range 1 GeV/c to 4 GeV/c. They were determined using COMPASS data taken with a polarised muon beam of 160 GeV/c or 200 GeV/c impinging on polarised 6LiD or NH3 targets. The experimental asymmetries are compared to next-to-leading order pQCD calculations, and are sensitive to the gluon polarisation Delta G inside the nucleon in the range of the nucleon momentum fraction carried by gluons 0.05 < xg < 0.2.

Longitudinal double spin asymmetries in single hadron quasi-real photoproduction at high pT

BIRSA, RENATO;BRADAMANTE, FRANCO;BRESSAN, Andrea;DALLA TORRE, SILVIA;DASGUPTA, SHUDDHA SHANKAR;DUIC, VENICIO;LEVORATO, STEFANO;Makke, Nour;MARTIN, ANNA;MATOUSEK, JAN;SBRIZZAI, GIULIO;SCHIAVON, PAOLO;SOZZI, FEDERICA;TAKEKAWA, STEFANO;TESSAROTTO, FULVIO;
2016

Abstract

We measured the longitudinal double spin asymmetries ALL for single hadron muoproduction off protons and deuterons at photon virtuality Q 2 < 1 (GeV/c)2 for transverse hadron momenta pT in the range 1 GeV/c to 4 GeV/c. They were determined using COMPASS data taken with a polarised muon beam of 160 GeV/c or 200 GeV/c impinging on polarised 6LiD or NH3 targets. The experimental asymmetries are compared to next-to-leading order pQCD calculations, and are sensitive to the gluon polarisation Delta G inside the nucleon in the range of the nucleon momentum fraction carried by gluons 0.05 < xg < 0.2.
http://www.sciencedirect.com/science/article/pii/S0370269315009831
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11368/2871214
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