论文标题
在$ \ sqrt {s} = $ 8 tev的质子 - proton碰撞中的单差异二颗生产的测量
Measurement of single-diffractive dijet production in proton-proton collisions at $\sqrt{s} =$ 8 TeV with the CMS and TOTEM experiments
论文作者
论文摘要
提出了一个单二帧二重横截面和衍射横截面的测量结果，该横截面是质子分数动量损失$ξ$和四摩诺特姆传输平方$ t $的函数。这两个过程pp $ \ to $ px和pp $ \ to $ xp，即测量质子散射到交互点的任一侧，其中x至少包含两个喷气机；平均两个过程的结果。这些分析基于与$ \ sqrt {s} $ = 8 tev在LHC proton-Proton碰撞中同时收集的数据，该数据在$β^{\ ast} = $ 90 m的专用运行期间= $ 90 m处于低固定速度和对应的$β^{\ ast} = $ 90 m，并对应于$ nbeminate的流感和对应于$ 37.5 nb $ nb $ nb $^nb $ nb $^nb $ nb $ nb $^nb $^nb $^nb $^nb $ nb。在Kinematic区域$ξ\ lt $ 0.1，0.03 $ \ lt $ \ lt | $ \ lt | $ t | $ t | $ t $ | | \ lt 1 $ gev $^2 $，至少有两个带有横向动量的喷气机$ p_ \ mathrm {t}> $ 40 gev和pseudorapities $ |最寻|η| \ lt $ 4.4，IS 21.7 $ \ pm $ 0.9（stat）$^{+3.0} _ { - 3.3} $（syst）$ \ pm $ 0.9（lum）nb。单位差异与包含二重的产量的比率（每单位$ξ$）作为$ x $的函数，这是$ x $的函数，$ x $是击中的parton携带的质子的纵向动量分数。上面定义的运动区域的比率，$ x $值在$ -2.9 $ \ leq \ log_ {10} x \ leq $ - $ - $ 1.6，IS $ r =（σ^\ mathrm {px} _ { 0.025 $ \ pm $ 0.001（stat）$ \ pm $ 0.003（syst），其中$σ^\ mathrm {px} _ {\ mathrm {jj}} $和$σ_ {\ \ mathrm {将结果与衍射和非屈光相互作用模型的预测进行了比较。基于HERA衍射的Parton分布功能的蒙特卡洛预测与数据校正时，与数据隔离效果相吻合。
Measurements are presented of the single-diffractive dijet cross section and the diffractive cross section as a function of the proton fractional momentum loss $ξ$ and the four-momentum transfer squared $t$. Both processes pp$\to$pX and pp$\to$Xp, ie with the proton scattering to either side of the interaction point, are measured, where X includes at least two jets; the results of the two processes are averaged. The analyses are based on data collected simultaneously with the CMS and TOTEM detectors at the LHC in proton-proton collisions at $\sqrt{s}$= 8 TeV during a dedicated run with $β^{\ast} =$ 90 m at low instantaneous luminosity and correspond to an integrated luminosity of 37.5 nb$^{-1}$. The single-diffractive dijet cross section $σ^\mathrm{pX}_{\mathrm{jj}}$, in the kinematic region $ξ\lt$ 0.1, 0.03 $\lt |$t$| \lt 1$ GeV$^2$, with at least two jets with transverse momentum $p_\mathrm{T} >$ 40 GeV, and pseudorapidity $|η| \lt$ 4.4, is 21.7$\pm$0.9 (stat)$^{+3.0}_{-3.3}$ (syst) $\pm$ 0.9 (lum) nb. The ratio of the single-diffractive to inclusive dijet yields, normalised per unit of $ξ$, is presented as a function of $x$, the longitudinal momentum fraction of the proton carried by the struck parton. The ratio in the kinematic region defined above, for $x$ values in the range $-$2.9 $\leq \log_{10} x \leq$ $-$1.6, is $R = (σ^\mathrm{pX}_{\mathrm{jj}}/Δξ)/σ_{\mathrm{jj}} =$ 0.025$\pm$0.001 (stat) $\pm$ 0.003 (syst), where $σ^\mathrm{pX}_{\mathrm{jj}}$ and $σ_{\mathrm{jj}}$ are the single-diffractive and inclusive dijet cross sections, respectively. The results are compared with predictions from models of diffractive and nondiffractive interactions. Monte Carlo predictions based on the HERA diffractive parton distribution functions agree well with the data when corrected for the effect of soft rescattering between the spectator partons.
