高多重数pp碰撞饱和环境中的重夸克偶素
Heavy quarkonium in saturated environment of high-multiplicity pp collisions
摘要：
高多重pp碰撞表现出的功能，传统上与核效应。一致性促使人们平等对待高度多重性的pp、pA和AA碰撞。我们依赖于光强子平均多重数和J/psi的唯象参数化，假设它们在pA碰撞中线性依赖于N_{coll}。这种方法的结果低估了最近测量的生产率J/psi在非常高的强子多重性。J/psi多重数对N_{coll}的线性依赖关系受到预测的非线性修正，与碰撞致密部分子云中饱和度尺度的相互提升有关。无参数计算的非线性校正允许解释数据的PT集成产量J/psi在高强子多重性。计算结果与在几个pT间隔中的数据也很好地一致。正如所预测的那样，在pA碰撞中，Upperdance和J/psi在向前的快速性上同样受到抑制。因此，在pp碰撞中，它们在前向快度处的分数多重数也是相等的，它们的大小与数据一致。
英文摘要：
High-multiplicity pp collisions exhibit features, traditionally associated with nuclear effects. Coherence motivates to treat high-multiplicity pp, pA and AA collisions on an equal footing. We rely on the phenomenological parametrization for mean multiplicities of light hadrons and J/psi, assuming their linear dependence on N_{coll} in pA collisions. The results of this approach underestimate the recently measured production rate of J/psi at very high hadronic multiplicities. The linear dependence of J/psi multiplicity on N_{coll} is subject to predicted nonlinear corrections, related to mutual boosting of the saturation scales in colliding dense parton clouds. A parameter-free calculation of the non-linear corrections allows to explain data for pT-integrated yield of J/psi at high hadronic multiplicities. Calculations are in a good accord with data binned in several pT-intervals as well. As was predicted, Upsilon and J/psi are equally suppressed at forward rapidities in pA collisions. Consequently, their fractional multiplicities at forward rapidities in pp collisions are equal as well, and their magnitude agrees with data.
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