论文标题
产生底部衰变的松散结合的强子分子
Production of loosely-bound hadron molecules from bottomonium decays
论文作者
论文摘要
我们在底部歼灭中生产松散结合的分子和$ e^+e^ - $ collisions $ \ sqrt {s} = 10.58 $ GEV。我们对该能源区域中所有现有数据的几种模型进行了首次综合测试。我们符合模型的免费参数来重现观察到的横截面，并且我们预测了Deuteron Spectrum和生产以及$ e^ + E^ - \ to d \ bar {d} + x $处理的横截面，这两者都在$υ（1,2,3S）$ resonances us n和$ \ sqrt and $ \ sqrt and $ \ SQRT crt crt and and}。预测的光谱显示出差异，但都与现有数据的不确定性兼容。如果Belle〜II实验收集了较大的数据集，则可以解决这些差异。固定源大小参数以重现Deuteron数据，然后使用简单的合并模型预测了该能量区域$ H $ dibaryon和Hypertriton的生产率。我们对$ h $ dibaryon生产率的预测低于Belle实验的直接搜索设定的限制，但在Belle〜II实验中可以访问的范围。由于使用$υ$衰减中的单粒子和双粒子光谱的可用测量，由于将Quarks和Gluon片段化引起的系统效应减少了\ Pythia Montecarlo发电机的新调整。
We present multiple results on the production of loosely-bound molecules in bottomonium annihilations and $e^+e^-$ collisions at $\sqrt{s} = 10.58$ GeV. We perform the first comprehensive test of several models for deuteron production against all the existing data in this energy region. We fit the free parameters of the models to reproduce the observed cross sections, and we predict the deuteron spectrum and production and the cross section for the $e^+e^- \to d\bar{d} + X$ process both at the $Υ(1,2,3S)$ resonances and at $\sqrt{s}=10.58$ GeV. The predicted spectra show differences but are all compatible with the uncertainties of the existing data. These differences could be addressed if larger datasets are collected by the Belle~II experiment. Fixing the source size parameter to reproduce the deuteron data, we then predict the production rates for $H$ dibaryon and hypertriton in this energy region using a simple coalescence model. Our prediction on $H$ dibaryon production rate is below the limits set by the direct search at the Belle experiment, but in the range accessible to the Belle~II experiment. The systematic effect due to the MC modelling of quarks and gluon fragmentation into baryons is reduced deriving a new tuning of the \pythia MonteCarlo generator using the available measurement of single- and double-particle spectra in $Υ$ decays.
