论文标题
$ \ sqrt {s} = 13 $ tev the Atlas检测器的弹性散射的总横截面和$ρ$参数的测量
Measurement of the total cross section and $ρ$-parameter from elastic scattering in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
论文作者
论文摘要
在具有$β^\ star = 2.5〜 $ km的LHC的特殊运行中，质子 - 普罗希望弹性分裂事件的记录为$ \ \ sqrt {s} = 13〜 $ tev，其集成亮度为$ 340〜μ \ textrm {b}^b}^{-1} $ 340〜μ \ textrmastion in al al al al al a al s sumers int a al a al s s s sup at f.16在Mandelstam $ t $变量中差异范围从$ -T = 2.5 \ CDOT 10^{ - 4}〜$ GEV $^{2} $到$ -T = 0.46〜 $ GEV $^{2} $，使用690万弹性派遣候选人。本文介绍了总跨部分$σ_{\ textrm {tot}} $，核斜率的参数，以及$ρ$ - 参数定义为实际零件与弹性射击幅度的假想部分的比率，在极限$ t \ rightarrow 0 $中。这些参数是使用$ t $依赖性的光学定理和不同参数化的差异弹性横截面确定的。 $σ_ {\ textrm {tot}} $和$ρ$的结果是\ begin {equation*}σ_{\ textrm {tot}}}（pp \ rightArrow x）= \ mbox {104.7} \ pm 1.1 \ pm 1.1 \; \ mbox {mb}，\; \; \; ρ= \ mbox {0.098} \ pm 0.011。 \ end {equation*} $σ_ {\ textrm {tot}} $中的不确定性以光度测量为主导，而在$ρ$中以对检测器对齐和建模核幅度的不完美知识。
In a special run of the LHC with $β^\star = 2.5~$km, proton-proton elastic-scattering events were recorded at $\sqrt{s} = 13~$TeV with an integrated luminosity of $340~μ\textrm{b}^{-1}$ using the ALFA subdetector of ATLAS in 2016. The elastic cross section was measured differentially in the Mandelstam $t$ variable in the range from $-t = 2.5 \cdot 10^{-4}~$GeV$^{2}$ to $-t = 0.46~$GeV$^{2}$ using 6.9 million elastic-scattering candidates. This paper presents measurements of the total cross section $σ_{\textrm{tot}}$, parameters of the nuclear slope, and the $ρ$-parameter defined as the ratio of the real part to the imaginary part of the elastic-scattering amplitude in the limit $t \rightarrow 0$. These parameters are determined from a fit to the differential elastic cross section using the optical theorem and different parameterizations of the $t$-dependence. The results for $σ_{\textrm{tot}}$ and $ρ$ are \begin{equation*} σ_{\textrm{tot}}(pp\rightarrow X) = \mbox{104.7} \pm 1.1 \; \mbox{mb} , \; \; \; ρ= \mbox{0.098} \pm 0.011 . \end{equation*} The uncertainty in $σ_{\textrm{tot}}$ is dominated by the luminosity measurement, and in $ρ$ by imperfect knowledge of the detector alignment and by modelling of the nuclear amplitude.
