One of the key challenges for nuclear physics today is to understand from first principles the effective interaction between hadrons with different quark content. First successes have been achieved using techniques that solve the dynamics of quarks and gluons on discrete space-time lattices. Experimentally, the dynamics of the strong interaction have been studied by scattering hadrons off each other. Such scattering experiments are difficult or impossible for unstable hadrons and so high-quality measurements exist only for hadrons containing up and down quarks. Here we demonstrate that measuring correlations in the momentum space between hadron pairs produced in ultrarelativistic proton-proton collisions at the CERN Large Hadron Collider (LHC) provides a precise method with which to obtain the missing information on the interaction dynamics between any pair of unstable hadrons. Specifically, we discuss the case of the interaction of baryons containing strange quarks (hyperons). We demonstrate how, using precision measurements of p-omega baryon correlations, the effect of the strong interaction for this hadron-hadron pair can be studied with precision similar to, and compared with, predictions from lattice calculations. The large number of hyperons identified in proton-proton collisions at the LHC, together with an accurate modelling of the small (approximately one femtometre) inter-particle distance and exact predictions for the correlation functions, enables a detailed determination of the short-range part of the nucleon-hyperon interaction.
Quarkonium+$γ$ production in coherent hadron - hadron interactions at LHC energies
本文研究了强子-强子相干相互作用中的$H + γ$（$H = J/Ψ$和$Υ$）产生.考虑到超相对论质子作为光子源，我们利用非相对论QCD（NRQCD）分解形式并考虑不同的矩阵元值，估算了$γ+ p \rightarrow H + γ+ X$截面.我们对$\sqrt{s} = 7$和14 TeV的总$ p + p \rightarrow p + H + γ+ X$截面和快度分布的计算结果表明，对LHC产生$J/Ψ+ γ$的实验分析是可行的。
Gluon saturation and energy dependence of hadron multiplicity in pp and AA collisions at the LHC
ALICE合作组在大型强子对撞机（LHC）上进行的\sqrt{s} =2.76 TeV Pb+Pb碰撞的最新结果表明，Pb+Pb碰撞中带电强子多重数的能量依赖性与p+p碰撞中的有很大不同.我们表明，这种不同的能量依赖性可以解释列入一个强的角度排序的胶子衰变级联内的颜色玻璃凝聚（或胶子饱和）的方法。这种效应在饱和尺度大于1 GeV的核-核碰撞中更为重要。我们的公式很好地描述了p+p和Pb+Pb碰撞的LHC数据。
