论文标题
在$ \ sqrt {s} = 200 $ gev的质子 - proton碰撞中的中央独家产生的中央独家生产，在RHIC上使用Star Detecter进行测量
Measurement of the central exclusive production of charged particle pairs in proton-proton collisions at $\sqrt{s} = 200$ GeV with the STAR detector at RHIC
论文作者
论文摘要
我们报告了中央独家生产的电荷粒子对$ h^{+} h^{ - } $（$ h =π，k，p $）的测量值，以及proton-proton碰撞的恒星检测器$ \ sqrt {s} = 200 $ gev。在反应$ pp \ to p^\ prime+h^{+} h^{ - }+p^\ prime $中产生的带电粒子对是从中央检测器中的轨道重建的，而前向质质子则在罗马锅系统中测量。差分横截面在基准区域进行测量，该区域大致对应于质子顶点的四个摩氏转移的平方，$ 0.04〜 \ mbox {gev}^2 <-t_1，-t_2 <0.2〜 \ 0.2〜 \ \ mbox {gev}^gev}^2 $，dop the Invariant massors of to and of to and op to and op to and op to and op to and op of to a a dope and op to a a doce an中央生产的Hadron在$ |η| <0.7 $的范围内。将测得的横截面与基于双波梅隆交换（DPE）模型的现象学预测进行了比较。在$π^{+}π^{ - } $和$ k^{+} k^{ - } $对的质谱中观察到的结构与DPE模型是一致的，而培养尖的角度分布则表明$π^{+}π^{+}π^{ - } $生产的主要旋转-0有效。基金会$π^+π^ - $横截面被外推到Lorentz-Invariant区域，该区域将不变的质谱分解为连续性和共振贡献。推断的横截面由连续产量很好地描述，至少三个共鸣，即$ f_0（980）$，$ f_2（1270）$和$ f_0（1500）$，其中可能来自$ f_0（1370）$的较小贡献。拟合在$ t_1 $的函数和$ t_2 $的函数中，拟合了$π^+π^ - $对的多个bin中的指数斜率参数。这些参数对相互作用区域的大小敏感。
We report on the measurement of the Central Exclusive Production of charged particle pairs $h^{+}h^{-}$ ($h = π, K, p$) with the STAR detector at RHIC in proton-proton collisions at $\sqrt{s} = 200$ GeV. The charged particle pairs produced in the reaction $pp\to p^\prime+h^{+}h^{-}+p^\prime$ are reconstructed from the tracks in the central detector, while the forward-scattered protons are measured in the Roman Pot system. Differential cross sections are measured in the fiducial region, which roughly corresponds to the square of the four-momentum transfers at the proton vertices in the range $0.04~\mbox{GeV}^2 < -t_1 , -t_2 < 0.2~\mbox{GeV}^2$, invariant masses of the charged particle pairs up to a few GeV and pseudorapidities of the centrally-produced hadrons in the range $|η|<0.7$. The measured cross sections are compared to phenomenological predictions based on the Double Pomeron Exchange (DPE) model. Structures observed in the mass spectra of $π^{+}π^{-}$ and $K^{+}K^{-}$ pairs are consistent with the DPE model, while angular distributions of pions suggest a dominant spin-0 contribution to $π^{+}π^{-}$ production. The fiducial $π^+π^-$ cross section is extrapolated to the Lorentz-invariant region, which allows decomposition of the invariant mass spectrum into continuum and resonant contributions. The extrapolated cross section is well described by the continuum production and at least three resonances, the $f_0(980)$, $f_2(1270)$ and $f_0(1500)$, with a possible small contribution from the $f_0(1370)$. Fits to the extrapolated differential cross section as a function of $t_1$ and $t_2$ enable extraction of the exponential slope parameters in several bins of the invariant mass of $π^+π^-$ pairs. These parameters are sensitive to the size of the interaction region.
