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Production of f2(1270) meson in pp collisions at the LHC via gluon-gluon fusion in the k-factorization approach
Physics Letters B ( IF 4.3 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.physletb.2020.135816
Piotr Lebiedowicz , Antoni Szczurek

Abstract 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 ⁎ → 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 γ γ → f 2 ( 1270 ) → π π reactions. Different modern UGDFs from the literature are used. The results strongly depend on the parametrization of the g ⁎ g ⁎ → 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 ⁎ → 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.

中文翻译:

在 LHC 的 pp 碰撞中通过 k 分解方法中的胶子-胶子融合产生 f2(1270) 介子

摘要 我们通过具有未积分胶子分布函数 (UGDF) 的 kt 分解方法中的彩色单线态胶子-胶子融合计算 f 2 ( 1270 ) 张量介子产生的包含横截面。在搜索饱和效应的上下文中,该过程可能很有趣。g ⁎ g ⁎ → f 2 (1270) 顶点使用能量-动量张量,相当于螺旋度 2 耦合和螺旋度 0 耦合。我们的计算中使用了文献中 helicity-2 和 helicity-0 张量结构的两种不同的参数化。一些参数是从 γ γ → f 2 (1270) → π π 反应中提取的。使用了来自文献的不同现代 UGDF。结果在很大程度上取决于 g ⁎ g ⁎ → f 2 (1270) 形状因子的参数化。我们的 f 2 横向动量分布结果与初步 ALICE 数据进行了比较。仅对于 g ⁎ g ⁎ → f 2 (1270) 形状因子的某些参数化,我们只能在较大的 f 2 (1270) 横向动量下与数据取得一致。饱和开始的明显迹象是不可能的。在低横向动量下,还需要包括 ππ 终态再散射。通过调整f 2 (1270 ) 在严酷的夸克胶子和多粒子环境中的形成和存活概率,可以获得与ALICE 数据的一致性。此外还讨论了 pomeron-pomeron 融合机制,并对结果进行了量化。饱和开始的明显迹象是不可能的。在低横向动量下,还需要包括 ππ 终态再散射。通过调整f 2 (1270 ) 在严酷的夸克胶子和多粒子环境中的形成和存活概率,可以获得与ALICE 数据的一致性。此外还讨论了 pomeron-pomeron 融合机制,并对结果进行了量化。没有明显的饱和开始迹象是可能的。在低横向动量下,还需要包括 ππ 终态再散射。通过调整f 2 (1270 ) 在严酷的夸克胶子和多粒子环境中的形成和存活概率,可以获得与ALICE 数据的一致性。此外还讨论了 pomeron-pomeron 融合机制,并对结果进行了量化。
更新日期:2020-11-01
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