Los Alamos National Laboratory, Theoretical Division, MS B238, Los Alamos, New Mexico 87545, USA.
Phys Rev Lett. 2012 Jun 15;108(24):242001. doi: 10.1103/PhysRevLett.108.242001. Epub 2012 Jun 11.
Tagged jet measurements provide a promising experimental channel to quantify the similarities and differences in the mechanisms of jet production in proton-proton and nucleus-nucleus collisions. We present the first calculation of the transverse momentum asymmetry of Z0/γ*-tagged jet events in sqrt[s]=2.76 TeV reactions at the LHC. Our results combine the O(G(F)α(s)2) perturbative cross sections with the radiative and collisional processes that modify parton showers in the presence of dense strongly interacting matter. We find that a strong asymmetry is generated in central lead-lead reactions that has little sensitivity to the fluctuations of the underlying soft hadronic background. We present theoretical model predictions for its shape and magnitude.
标记喷注测量为定量研究质子-质子和核-核碰撞中喷注产生机制的异同提供了一个很有前途的实验通道。我们首次计算了在 LHC 上的 sqrt[s]=2.76 TeV 反应中 Z0/γ*-标记喷注事件的横动量不对称性。我们的结果将 O(G(F)α(s)2)微扰截面与辐射和碰撞过程相结合，这些过程在强相互作用物质的密集存在下改变了部分子喷注。我们发现，在中心铅-铅反应中产生了很强的不对称性，对基本软强子背景的涨落几乎没有敏感性。我们给出了其形状和大小的理论模型预测。
