论文标题
在高能$ pa $和$ aa $碰撞中隔离中央生产中的奥德隆
Isolating the Odderon in central production in high energy $pA$ and $AA$ collisions
论文作者
论文摘要
我们研究了横截面对中央独家生产横截面的速度的速度依赖性，该杂志$ pa $和$ aa $ collisions的c-even Mesons的速度依赖性，其中$ a $是沉重的离子。我们观察到由$γ$ -Odderon和Pomeron-Pomeron融合机制产生的贡献的质量不同。这可以用来从向前区域中专门生产的$ f_2 $介子的事件中提取odderon信号。使用Odderon横截面的预期值获得的估计值表明，$γ$ -Odderon的贡献可能超过了Pomeron诱导的PB-PB碰撞背景的几倍。此外，可以从$ pa $中的不对称性和$ aa $碰撞中清楚地看到odderon效果，并逆转目标。特别有趣的是，$γ$ -Odderon Fusion的不对称性在向前方向上达到接近1的最大值，而Pomeron-Pomeron融合贡献的不对称性很小。估计了$ f_2 $介子与重离子中核子的其他相互作用以及次级恢复的贡献。光子 - 奥德龙的贡献具有较大的归一化不确定性，但是增强的正向区域的横截面与较大的不对称性相结合增加了实验检测ODDERON的机会。
We study the rapidity dependence of the cross section on the rapidity of the central exclusive production cross sections of C-even mesons in $pA$ and $AA$ collisions, where $A$ is a heavy ion. We observe qualitatively different behaviour of the contributions arising from $γ$-Odderon and Pomeron-Pomeron fusion mechanisms. This can be used to extract the Odderon signal from the events of $f_2$ mesons exclusively produced in the forward region. Estimates, obtained using expected values of the Odderon cross section, indicate that the $γ$-Odderon contribution may exceed by a few times the Pomeron-induced background in Pb-Pb collisions. Moreover, the Odderon effect can be clearly seen in terms of the asymmetry in $pA$ and $AA$ collisions with the beam and target reversed. It is particularly interesting to note that the asymmetry for $γ$-Odderon fusion reaches its maximum value close to 1 in the forward direction, whereas the asymmetry for the Pomeron-Pomeron fusion contribution is small. The role of additional interactions of the $f_2$ meson with nucleons in the heavy ion, and also the contributions from secondary Reggeons, are estimated. The photon-Odderon contribution has a large normalisation uncertainty but the enhances cross-section in the forward region combined with a large asymmetry increases the chance of experimentally detecting the Odderon.
