在Compass上直接测量\DeltaG /G
Direct Measurement of \DeltaG/G at Compass
摘要：
胶子极化$Δ{G}/G$是进一步阐明核子自旋结构的关键。欧洲核子研究中心的COMPASS合作已着手直接测定这一数量。它通过光子-胶子融合过程（PGF）在散射极化介子极化氘核目标的胶子分布。它探索了三种不同的通道来标记PGF：开粲产生和高横动量（高p_T），无论是在电产生（Q^2 > 1 GeV^2）还是准真实光产生（Q^2 < 1 GeV^2）中。高p_T准真实光生通道产生最精确的测量。结果表明，胶子极化很小。我描述了它的实验方面和它的理论框架，基于PYTHIA。我报告在其他两个渠道获得的初步结果，并对未来的分析和数据采集的前景。
英文摘要：
The gluon polarization $Δ{G}/G$ is the key to a further clarification of the spin structure of the nucleon. The COMPASS collaboration at CERN has set out to undertake the direct determination of this quantity. It accesses the gluon distribution via the photon-gluon fusion process (PGF) in scattering polarized muons off a polarized deuteron target. And it explores three different channels to tag the PGF: open charm production and high transverse momentum (high p_T), in either electroproduction (Q^2 > 1 GeV^2) or quasi-real photoproduction (Q^2 < 1 GeV^2). The high p_T quasi-real photoproduction channel yields the most precise measurement. The result indicates that the gluon polarization is small. I describe its experimental aspects and its theoretical framework, based on PYTHIA. And I report on the preliminary results obtained in the other two channels, and on the prospects for future analysis and data taking.
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