大横动量夸克偶素的最佳自旋量子化轴
Optimal spin-quantization axes for quarkonium with large transverse momentum
摘要：
胶子碰撞过程产生了一个相对动量小而横动量大的重夸克反夸克对，在QCD耦合常数的前一级，胶子碰撞过程预言了这对夸克的横极化将随其横动量的增加而增加。费米实验室Tevatron对粲偶素和bottomonium态相对于特定自旋量子化轴的极化的测量与这一预测不一致。然而，完全横向极化的预测速率取决于自旋量子化轴的选择。我们引入轴，最大化和最小化的横向极化的领先阶胶子碰撞过程。它们由提供大部分平衡横向动量的射流方向决定。
英文摘要：
The gluon collision process that creates a heavy-quark-antiquark pair with small relative momentum and large transverse momentum predicts at leading-order in the QCD coupling constant that the transverse polarization of the pair should increase with its transverse momentum. Measurements at the Fermilab Tevatron of the polarization of charmonium and bottomonium states with respect to a particular spin-quantization axis are inconsistent with this prediction. However the predicted rate of approach to complete transverse polarization depends on the choice of spin-quantization axis. We introduce axes that maximize and minimize the transverse polarization from the leading-order gluon collision process. They are determined by the direction of the jet that provides most of the balancing transverse momentum.
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