论文标题
$υ$（1s）对生产横截面的测量，并在$ \ sqrt {s} = $ 13 tev proton-proton碰撞中搜索腐烂到$υ$（1s）$υ$（1s）$υ$（1s）
Measurement of the $Υ$(1S) pair production cross section and search for resonances decaying to $Υ$(1S)$μ^+μ^-$ in proton-proton collisions at $\sqrt{s} =$ 13 TeV
论文作者
论文摘要
在质子 - 普罗顿碰撞中的$υ$（1s）的基准横截面在该地区的质量中心碰撞中，该地区的质量中心能量在该地区的质量中心碰撞，$υ$（1s）erson的绝对速度低于2.0，以79 $ \ $ \ pm $ 11（stat）$ \ pm 6（syst）$ 3（syst）$ \ $ 3（$ \ $ \ $ 3（$ 3）不偏振。最后的不确定性对应于$υ$（1s）Meson Dimuon分支分支的不确定性。该测量是在最终状态下使用四个MUON进行的，使用LHC的CMS实验在2016年收集的Proton-Proton碰撞数据，对应于35.9 fb $^{ - 1} $的集成光度。此过程是在同一最终状态下搜索窄谐振到$υ$（1s）$μ^+μ^ - $的标准模型参考。这样的共振可能表明存在一个二夸克的界定状态和两个$ \ bar {\ mathrm {b}} $ angiquarks。在底部夸克质量（17.5至19.5 GEV）附近的群众进行四夸克搜索，而对16.5至27 GEV之间的群众进行了对其他共振的一般搜索。在数据中没有观察到与狭窄共振兼容的大量事件。通过中间$υ$（1s）共振，生产横截面的限制将分支分支为四个MUON，作为共振质量的函数。
The fiducial cross section for $Υ$(1S) pair production in proton-proton collisions at a center-of-mass energy of 13 TeV in the region where both $Υ$(1S) mesons have an absolute rapidity below 2.0 is measured to be 79 $\pm$ 11 (stat) $\pm$ 6 (syst) $\pm$ 3 ($\mathcal{B}$) pb assuming the mesons are produced unpolarized. The last uncertainty corresponds to the uncertainty in the $Υ$(1S) meson dimuon branching fraction. The measurement is performed in the final state with four muons using proton-proton collision data collected in 2016 by the CMS experiment at the LHC, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. This process serves as a standard model reference in a search for narrow resonances decaying to $Υ$(1S)$μ^+μ^-$ in the same final state. Such a resonance could indicate the existence of a tetraquark that is a bound state of two b quarks and two $\bar{\mathrm{b}}$ antiquarks. The tetraquark search is performed for masses in the vicinity of four times the bottom quark mass, between 17.5 and 19.5 GeV, while a generic search for other resonances is performed for masses between 16.5 and 27 GeV. No significant excess of events compatible with a narrow resonance is observed in the data. Limits on the production cross section times branching fraction to four muons via an intermediate $Υ$(1S) resonance are set as a function of the resonance mass.
