论文标题
QCD预测固定目标实验中LHCB的开放式魅力梅森产生
QCD predictions for open charm meson production at the LHCb in fixed-target experiment
论文作者
论文摘要
我们在$ \ sqrt {s} = 86.6 $ gev中调查了固定目标LHCB实验中的开放式魅力梅森生产，$ p+^4 \！\ mathrm {he} $ collisions。魅力横截面的理论计算是在$ k_ {t} $ - 分解方法的框架中完成的。它在从未检查过的运动范围内的应用进行了仔细的讨论。我们考虑了与质子中不同不整合（横向动量依赖性）parton密度相关的计算方案。我们在分析中包括基于CCFM和DGLAP的未集成分布模型，适用于所考虑的运动学。显示了集成的和差分横截面作为$ d^{0} $梅森速度和横向动量的函数，并与实验数据进行了比较。作为参考点，还介绍和讨论了对临近顺序联合方法方法的预测。实验数据与$ k_ {t} $ - 因子化预测之间的一个非常好的一致性。质子中Parton分布的CCFM和基于DGLAP的框架都成功地用于解释LHCB固定目标开放式炭横截面。
We investigate open charm meson production in fixed-target LHCb experiment at $\sqrt{s}=86.6$ GeV in $p+^4\!\mathrm{He}$ collisions. Theoretical calculations of charm cross section are done in the framework of the $k_{T}$-factorization approach. Its application in the kinematical range never examined before is carefully discussed. We consider different schemes for the calculations relevant for different unintegrated (transverse momentum dependent) parton densities in a proton. We include in the analysis both CCFM- and DGLAP-based models of unintegrated parton distributions appropriate for the considered kinematics. Integrated as well as differential cross sections as a function of $D^{0}$ meson rapidity and transverse momentum are shown and compared with the experimental data. As a reference point, predictions of next-to-leading order collinear approach are also presented and discussed. A very good agreement between the experimental data and the $k_{T}$-factorization predictions was obtained. Both the CCFM and the DGLAP-based frameworks for parton distributions in a proton are successfully used to explain the LHCb fixed-target open charm cross section.
