论文标题
$ \ sqrt {s} = 13 $ tev的弹性散射的总横截面和$ρ$ - 参数
Determination 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
提出了用Atlas-Alfa检测器的$ \ sqrt {s} = 13 $ tev的弹性$ pp $散射的新测量。使用$β^\ star = 2.5 $ km的LHC特殊运行中记录的数据进行测量。弹性横截面在Mandelstam $ t $变量中进行了差异测量，从拟合到$ {\ textrm {d}}σ/\ textrm {d} t $总横截面，$ρ$参数 - 参数和核斜率的参数。 $σ_ {\ textrm {tot}} $和$ρ$的结果是\ begin {equation*}σ_{\ textrm {tot}}}（pp \ rightarrow x）= \ mbox {\ mbox {104.7} \; \ pm 1.1 \; \ mbox {mb}， \; \; ρ= \ mbox {0.098} \; \ pm 0.011。 \ end {等式*} $σ_ {\ textrm {tot}} $和通过分散关系连接的$ρ$的能量演变与多种模型进行了比较。此外，总非弹性横截面是根据总和弹性横截面的差确定的，并计算了弹性与总横截面的比率。
A new measurement of elastic $pp$ scattering at $\sqrt{s} = 13$ TeV with the ATLAS-ALFA detector is presented. The measurement was performed using data recorded in a special run of the LHC with $β^\star = 2.5$ km. The elastic cross-section was measured differentially in the Mandelstam $t$ variable and from a fit to ${\textrm{d}}σ/\textrm{d}t$ the total cross section, the $ρ$-parameter and parameters of the nuclear slope are determined. 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 energy evolution of $σ_{\textrm{tot}}$ and $ρ$, connected through dispersion relations, is compared to several models. Furthermore, the total inelastic cross section is determined from the difference of the total and elastic cross section, and the ratio of the elastic to total cross section is calculated.
