论文标题
在$ \ sqrt {s} $ = 13 tev中观察质子 - 普罗顿碰撞中的双parton散射的同符号WW生产
Observation of same-sign WW production from double parton scattering in proton-proton collisions at $\sqrt{s}$ = 13 TeV
论文作者
论文摘要
据报道，在Proton-Proton碰撞中，首次观察了双方散射过程中使用相同的电子事件和Dimuon事件的W $^\ PM $ W $^\ pm $ BOSON的首次观察。数据样本对应于使用CERN LHC的CMS检测器以13 TEV记录的138 fb $^{ - 1} $的集成光度。多元判别因子用于区分信号过程和主要背景。进行bin的最大似然拟合以提取信号横截面。测量的横截面相同签名的W玻色子腐烂的衰变是80.7 $ \ pm $ \ $^{stat）$^{+9.5} _ { - 8.6} $（syst）$ \ pm $ \ pm $ 12.1（型号）fb 0.37（型号）fb。观察到的信号的显着性为6.2位于仅背景假设的标准偏差。
The first observation of the production of W$^\pm$W$^\pm$ bosons from double parton scattering processes using same-sign electron-muon and dimuon events in proton-proton collisions is reported. The data sample corresponds to an integrated luminosity of 138 fb$^{-1}$ recorded at a center-of-mass energy of 13 TeV using the CMS detector at the CERN LHC. Multivariate discriminants are used to distinguish the signal process from the main backgrounds. A binned maximum likelihood fit is performed to extract the signal cross section. The measured cross section for production of same-sign W bosons decaying leptonically is 80.7 $\pm$ 11.2 (stat) $^{+9.5}_{-8.6}$ (syst) $\pm$ 12.1 (model) fb, whereas the measured fiducial cross section is 6.28 $\pm$ 0.81 (stat) $\pm$ 0.69 (syst) $\pm$ 0.37 (model) fb. The observed significance of the signal is 6.2 standard deviations above the background-only hypothesis.
