The event-by-event fluctuations of the mean transverse momentum ( p t ) in Au + Au collisions at ##IMG## [http://ej.iop.org/images/0954-3899/47/12/125102/gabb44eieqn1.gif] {$\sqrt{{s}_{\text{NN}}}=7.7$} –200 GeV and Pb + Pb collisions at ##IMG## [http://ej.iop.org/images/0954-3899/47/12/125102/gabb44eieqn2.gif] {$\sqrt{{s}_{\text{NN}}}=2.76\enspace \mathrm{T}\mathrm{e}\mathrm{V}$} are analyzed using a multiphase transport model (AMPT) with a dynamical quark coalescence mechanism (DQCM). The analysis shows that at 19.6 GeV there exists a splitting between the relative dynamical mean- p t fluctuation from the DQCM AMPT and from the original AMPT (i.e., AMPT with string melting) at freeze-out. Based on the hadron information obtained at different stages of nuclear collisions from the AMPT model, we show that this splitting first arises from the quark coalescence hadronization process, and then develops duri...

中文翻译：

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带有动态夸克合并机制的AMPT模型的逐事件均值波动

## IMG ## [http://ej.iop.org/images/0954-3899/47/12/125102/gabb44eieqn1]上Au + Au碰撞中平均横向动量（pt）的逐事件波动.gif] {$ \ sqrt {{s} _ {\ text {NN}}} = 7.7 $} –200 ## IMG ##的GeV和Pb + Pb碰撞[http://ej.iop.org/images /0954-3899/47/12/125102/gabb44eieqn2.gif] {$ \ sqrt {{s} _ {\ text {NN}}} = 2.76 \ enspace \ mathrm {T} \ mathrm {e} \ mathrm {V } $}是使用具有动态夸克合并机制（DQCM）的多相传输模型（AMPT）进行分析的。分析表明，在冻结时，在19.6 GeV处，来自DQCM AMPT和原始AMPT（即带弦熔化的AMPT）的相对动态均值波动之间存在分裂。根据从AMPT模型在核碰撞不同阶段获得的强子信息，