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arXiv 2108.09043hep-ex
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ATLAS量能器对来自运行2数据中$W^{\pm}\rightarrowτ^{\pm}(\rightarrowπ^{\pm}ν_τ)ν_τ$事件的带电π介子的能量响应的测量

Measurement of the energy response of the ATLAS calorimeter to charged pions from $W^{\pm}\rightarrowτ^{\pm}(\rightarrowπ^{\pm}ν_τ)ν_τ$ events in Run 2 data

ATLAS Collaboration

摘要:

测量了横向动量在$10<p_\textrm{T}<300$ GeV范围内的单荷π介子的能量响应。测量使用ATLAS探测器在运行2中获取的$\sqrt{s}=13$ TeV下的139 $\textrm{fb}^{-1}$ LHC质子-质子碰撞数据进行。源自$τ$ -轻子衰变的带电π介子用于提供高- $p_\textrm{T}$孤立粒子的样品,其中组成是已知的,以测试先前未通过原位单粒子测量探测的能量状态。在ATLAS模拟中,在$p_{\textrm{T}}$谱的中心区域,${\sim}2\%$高估了量热计对单π介子的响应,而在端盖区域,${\sim}4\%$低估了量热计对单π介子的响应。测量的不确定性是${\lesssim}1\%$为$15<p_\textrm{T}<185$ GeV的中心区域。为了研究差异的来源,还将数据和模拟之间的量热计能量与轨道动量之比的分布宽度、每层能量和强子量热计中的响应进行了比较。

英文摘要:

The energy response of the ATLAS calorimeter is measured for single charged pions with transverse momentum in the range $10<p_\textrm{T}<300$ GeV. The measurement is performed using 139 $\textrm{fb}^{-1}$ of LHC proton-proton collision data at $\sqrt{s}=13$ TeV taken in Run 2 by the ATLAS detector. Charged pions originating from $τ$-lepton decays are used to provide a sample of high-$p_\textrm{T}$ isolated particles, where the composition is known, to test an energy regime that has not previously been probed by in situ single-particle measurements. The calorimeter response to single-pions is observed to be overestimated by ${\sim}2\%$ across a large part of the $p_{\textrm{T}}$ spectrum in the central region and underestimated by ${\sim}4\%$ in the endcaps in the ATLAS simulation. The uncertainties in the measurements are ${\lesssim}1\%$ for $15<p_\textrm{T}<185$ GeV in the central region. To investigate the source of the discrepancies, the width of the distribution of the ratio of calorimeter energy to track momentum, the energies per layer and response in the hadronic calorimeter are also compared between data and simulation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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