论文标题
使用CLAS探测器的$ F_2（1270）$ MESON的光生生效
Photoproduction of the $f_2(1270)$ meson using the CLAS detector
论文作者
论文摘要
$ f_2（1270）$梅森的夸克结构多年来一直被认为是纯夸克式的（$ q \ bar {q} $）带有量子数字$ j^{pc} = 2^{++} $的共鸣。最近，有人提出，$ f_2（1270）$是由两个$ρ$ -Mesons的有吸引力的相互作用制成的分子状态。由于主要的衰减$ρ\至π^+π^ - $，预计这种状态将强烈衰减给具有带电的乳头的最终状态，而对两个中性乳头的衰减可能会被抑制。在这里，我们首次使用Jefferson Lab的CLAS检测器进行反应$γp\至π^0π^0 p $，以在3.6-5.4〜GEV之间进行入射束能量。差异横截面，$dσ/ dt $，以$ f_2（1270）$ photoproduction的精度提取，由于背景较低，并与理论计算进行了比较。
The quark structure of the $f_2(1270)$ meson has, for many years, been assumed to be a pure quark-antiquark ($q\bar{q}$) resonance with quantum numbers $J^{PC} = 2^{++}$. Recently, it was proposed that the $f_2(1270)$ is a molecular state made from the attractive interaction of two $ρ$-mesons. Such a state would be expected to decay strongly to final states with charged pions, due to the dominant decay $ρ\to π^+ π^-$, whereas decay to two neutral pions would likely be suppressed. Here, we measure for the first time the reaction $γp \to π^0 π^0 p$, using the CLAS detector at Jefferson Lab for incident beam energies between 3.6-5.4~GeV. Differential cross sections, $dσ/ dt$, for $f_2(1270)$ photoproduction are extracted with good precision, due to low backgrounds, and are compared with theoretical calculations.
