论文标题

轴向矢量的中央独家衍射产生$ f_ {1}(1285)$和$ f_ {1}(1420)$介入质子 - proton-proton碰撞

Central exclusive diffractive production of axial-vector $f_{1}(1285)$ and $f_{1}(1420)$ mesons in proton-proton collisions

论文作者

Lebiedowicz, Piotr, Leutgeb, Josef, Nachtmann, Otto, Rebhan, Anton, Szczurek, Antoni

论文摘要

我们介绍了$ f_ {1}(1285)$和$ f_ {1}(1420)$ proton-proton碰撞共振的中央独家衍射生产的研究。理论结果是在张量 - 托米龙方法中计算的。派生了两个Pomeron-Pomeron- $ f_ {1} $张紧耦合,由$(l,s)=(2,2)$和$(4,4)$标记。我们将模型参数(耦合常数,截止常数)调整为WA102实验数据,以考虑到吸收效果。 $(l,s)=(2,2)$和$(4,4)$耦合分别允许一个人描述WA102差异分布。我们将这些预测与Sakai-Sugimoto模型的预测进行了比较,其中Pomeron-Pomeron- $ f_ {1} $耦合由QCD的混合轴向重力异常确定。我们得出了这种方法的Pomeron-Pomeron- $ f_ {1} $耦合常数与$(l,s)=(2,2)$和$(4,4)$耦合之间的近似关系。然后,我们介绍了RHIC和LHC可用的能量的预测。提供了总的横截面和几个差分分布。在外向质子的横向动量之间的方位角$ ϕ_ {pp} $中对分布的分析可用于解散$ f_ {1} $ - 和$η$ -Type的共振,从而有助于同一最终通道。我们为$ f_ {1}(1285)$ a总截面$ \ sim 38 $ $ $ $ b for $ \ sqrt {s} = 13 $ tev,并在$ f_ {1} $ of $ | of $ | {\ rm y_ {m y_ {m}}} | <2.5 $。我们预测,在$ f_ {1}(1285)$生产的横截面上,$ f_ {2}(1270)$在$π^{+}π^{ - }π^{ - }π^{+}π^{ - }π^{ - } $ decay通道中的$ f_ {2}(1270)$都要大得多。这打开了在LHC计划的实验中研究$ f_ {1}(1285)$梅森的可能性。

We present a study of the central exclusive diffractive production of the $f_{1}(1285)$ and $f_{1}(1420)$ resonances in proton-proton collisions. The theoretical results are calculated within the tensor-pomeron approach. Two pomeron-pomeron-$f_{1}$ tensorial couplings labeled by $(l,S) = (2,2)$ and $(4,4)$ are derived. We adjust the model parameters (coupling constants, cutoff constant) to the WA102 experimental data taking into account absorption effects. Both the $(l,S) = (2,2)$ and $(4,4)$ couplings separately allow one to describe the WA102 differential distributions. We compare these predictions with those of the Sakai-Sugimoto model, where the pomeron-pomeron-$f_{1}$ couplings are determined by the mixed axial-gravitational anomaly of QCD. We derive an approximate relation between the pomeron-pomeron-$f_{1}$ coupling constants of this approach and the $(l,S) = (2,2)$ and $(4,4)$ couplings. Then we present our predictions for the energies available at the RHIC and LHC. The total cross sections and several differential distributions are presented. Analysis of the distributions in the azimuthal angle $ϕ_{pp}$ between the transverse momenta of the outgoing protons may be used to disentangle $f_{1}$- and $η$-type resonances contributing to the same final channel. We find for the $f_{1}(1285)$ a total cross section $\sim 38$ $μ$b for $\sqrt{s} = 13$ TeV and a rapidity cut on the $f_{1}$ of $|{\rm y_{M}}| < 2.5$. We predict a much larger cross section for production of $f_{1}(1285)$ than for production of $f_{2}(1270)$ in the $π^{+}π^{-}π^{+}π^{-}$ decay channel for the LHC energies. This opens a possibility to study the $f_{1}(1285)$ meson in experiments planned at the LHC.

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