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Longitudinal double-spin asymmetry A₁^(rm p) and spin-dependent structure function g₁^(rm p) of the proton at small values of x and Q²
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arxiv 1710.01014 v1 pith:NIJ7GX72 submitted 2017-10-03 hep-ex
Longitudinal double-spin asymmetry A₁^(rm p) and spin-dependent structure function g₁^(rm p) of the proton at small values of x and Q²
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We present a precise measurement of the proton longitudinal double-spin asymmetry $A_1^{\rm p}$ and the proton spin-dependent structure function $g_1^{\rm p}$ at photon virtualities $0.006~({\rm GeV}/c)^2<Q^2 < 1~({\rm GeV}/c)^2$ in the Bjorken $x$ range of $4 \times 10^{-5} < x < 4 \times 10^{-2}$. The results are based on data collected by the COMPASS Collaboration at CERN using muon beam energies of $160~{\rm GeV}$ and $200~{\rm GeV}$. The statistical precision is more than tenfold better than that of the previous measurement in this region. In the whole range of $x$, the measured values of $A_1^{\rm p}$ and $g_1^{\rm p}$ are found to be positive. It is for the first time that spin effects are found at such low values of $x$.
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