XXIV International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS16)

The spin structure of the proton at low x and low Q2 in two-dimensional grids from COMPASS

13 Apr 2016, 11:20

15m

SR4a (DESY Hamburg)

Spin Physics WG6 Spin Physics

Speaker

Ana Sofia Nunes (LIP-Lisbon)

Description

The longitudinal double spin asymmetries A₁^p and the spin dependent structure function of the proton g₁^p were extracted from COMPASS data in the region of low x and low Q². The data were taken on 2007 and 2011 from scattering of polarised muons off polarised protons, resulting in a sample that is 150 times larger than the one from the previous experiment SMC that pioneered searches in this kinematic region. For the first time, A₁^p and g₁^p were evaluated in this region in two-dimensional grids of kinematic variables: (x,Q²), (ν,Q²), (x,ν) and (Q²,x). The following kinematic region was investigated: 4.0x10^-5<x<4.0x10^-2, 0.001<Q²<1 (GeV/c)² and 14<ν<194 GeV. The obtained results can be confronted with theoretical models.

Presentation materials

Slides

nunes_dis2016.pdf