论文标题
中央独家$π^+π^ - $ \ sqrt {s} = $ 5.02和13 TEV
Study of central exclusive $π^+π^-$ production in proton-proton collisions at $\sqrt{s} =$ 5.02 and 13 TeV
论文作者
论文摘要
$π^+π^ - $对的中央排他性和半二元生产用proton-proton碰撞中的CMS检测器在LHC的质子质量碰撞中测量5.02和13 TEV。这些非扰动过程的理论描述尚未在LHC上进行详细衡量，对模型构成了重大挑战。基于特定的能量损失，在CMS硅跟踪器中测量和鉴定了这两个PION，而通过量热计信息确保了其他颗粒的缺失。独家和半二元的中央$π^+π^ - $的总截面的总截面是作为不变性质量，横向动量和$π^+π^ - $ $ $ $系统在横向动量$ p_ p_ p_ \ nathrm {t} $ $ $ $ 0.2 g的函数的函数。 $ <$ 2.4。使用简单型号提取了四个共振通道F $ _0（500）$，$ρ^0（770）$，f $ _0（980）$的生产横截面。使用简单模型提取。这些结果代表了在LHC碰撞能量为5.02和13 TEV处的该过程的首次测量。
Central exclusive and semiexclusive production of $π^+π^-$ pairs is measured with the CMS detector in proton-proton collisions at the LHC at center-of-mass energies of 5.02 and 13 TeV. The theoretical description of these nonperturbative processes, which have not yet been measured in detail at the LHC, poses a significant challenge to models. The two pions are measured and identified in the CMS silicon tracker based on specific energy loss, whereas the absence of other particles is ensured by calorimeter information. The total and differential cross sections of exclusive and semiexclusive central $π^+π^-$ production are measured as functions of invariant mass, transverse momentum, and rapidity of the $π^+π^-$ system in the fiducial region defined as transverse momentum $p_\mathrm{T}(π)$ $>$ 0.2 GeV and pseudorapidity $|η(π)|$ $<$ 2.4. The production cross sections for the four resonant channels f$_0(500)$, $ρ^0(770)$, f$_0(980)$, and f$_2(1270)$ are extracted using a simple model. These results represent the first measurement of this process at the LHC collision energies of 5.02 and 13 TeV.
