论文标题
$ f_2（1270）$ Meson in $ pp $ collisions in LHC通过$ k_t $ -FACTORIZIADY方法通过Gluon-Gluon Fusion在LHC上生产
Production of $f_2(1270)$ meson in $pp$ collisions at the LHC via gluon-gluon fusion in the $k_t$-factorization approach
论文作者
论文摘要
我们计算$ f_2（1270）的包含横截面，$ tensor meson生产通过$ k_t $ - factorization方法的颜色singlet singlet gluon-gluon融合，并具有未集成的gluon分布功能（UGDFS）。在寻找饱和效应的背景下，该过程可能会很有趣。 $ g^* g^* \ to f_2（1270）$ tertex使用的螺旋量张量，相当于Helicity-2耦合和Helicity-0耦合。在我们的计算中使用了两个与文献的螺旋度-2和Helicity-0张力结构的参数化的不同。一些参数从$γγ\提取到f_2（1270）\至ππ$反应。使用了文献中不同的现代UGDF。结果在很大程度上取决于$ g^* g^* \的参数化到f_2（1270）$ form react。将$ F_2 $的横向动量分布的结果与初步的爱丽丝数据进行了比较。我们只能在$ g^* g^* \ to f_2（1270）$ form source的某些参数中获得与较大$ f_2（1270）$ transversemma的同意。没有明显的饱和发作迹象。在低横向动量下，一个人还需要包括$ππ$最终撤离。与爱丽丝数据的协议可以通过在刺激性的夸克 - 格鲁恩和乘数环境中调整$ f_2（1270）$的形成概率和生存概率来获得。还讨论了Pomeron-Pomeron融合机制，并进行了定量。
We calculate inclusive cross section for $f_2(1270)$ tensor meson production via color singlet gluon-gluon fusion in the $k_t$-factorization approach with unintegrated gluon distribution functions (UGDFs). The process may be potentially interesting in the context of searches for saturation effects. The energy-momentum tensor, equivalent to helicity-2 coupling, and helicity-0 coupling are used for the $g^* g^* \to f_2(1270)$ vertex. Two somewhat different parametrizations of helicity-2 and helicity-0 tensorial structure from the literature are used in our calculations. Some parameters are extracted from $γγ\to f_2(1270) \to ππ$ reactions. Different modern UGDFs from the literature are used. The results strongly depend on the parametrization of the $g^* g^* \to f_2(1270)$ form factor. Our results for transverse momentum distributions of $f_2$ are compared to preliminary ALICE data. We can obtain agreement with the data only at larger $f_2(1270)$ transverse momenta only for some parametrizations of the $g^* g^* \to f_2(1270)$ form factor. No obvious sign of the onset of saturation is possible. At low transverse momenta one needs to include also the $ππ$ final-state rescattering. The agreement with the ALICE data can be obtained by adjusting probability of formation and survival of $f_2(1270)$ in a harsh quark-gluon and multipion environment. The pomeron-pomeron fusion mechanism is discussed in addition and results are quantified.
