Measurement of charged particle multiplicities in pp collisions at $\sqrt{s} =7~\mbox{TeV}$ in the forward region
Measurement of charged particle multiplicities in pp collisions at $\sqrt{s} =7~\mbox{TeV}$ in the forward region
复制标题
前向区域 $sqrt{s} =7~mbox{TeV}$ 处 pp 碰撞中带电粒子多重性的测量
DOI：
10.1140/epjc/s10052-012-1947-8
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Aaij R
中科院分区：
文献类型：
--
作者：
Aaij R
用LHCb探测器研究了质心能量为的质子-质子碰撞中不同赝快度间隔η下的带电粒子产生。带电粒子在顶点探测器中的相互作用区域附近重建，这在η范围为−2.5<η<−2.0和2.0<η<4.5时提供了高重建效率。数据是用最小偏差触发器获取的，仅需要顶点检测器中的一个或多个重建轨迹。通过选取至少有一个横动量大于1GeV/ca的径迹的事件样本，研究了硬QCD子样本。几个事件发生器的数据进行了比较，没有一个能够完全描述的多重数分布或带电粒子密度分布作为η的函数。一般来说，模型低估了带电粒子的产生。
Charged particle production in proton-proton collisions is studied with the LHCb detector at a centre-of-mass energy ofin different intervals of pseudorapidityη. Charged particles are reconstructed close to the interaction region in the vertex detector, which provides high reconstruction efficiency in theηranges −2.5<η<−2.0 and 2.0<η<4.5. The data were taken with a minimum bias trigger, only requiring one or more reconstructed tracks in the vertex detector. By selecting an event sample with at least one track with a transverse momentum greater than 1 GeV/ca hard QCD subsample is investigated. Several event generators are compared with the data; none are able to describe fully the multiplicity distributions or the charged particle density distribution as a function ofη. In general, the models underestimate charged particle production.