论文标题
p-pb碰撞中的轻型梅森核修饰因子在前所未有的$ p_ \ mathrm {t} $ ranga
Light meson nuclear modification factor in p-Pb collisions over an unprecedented $p_\mathrm{T}$ range with ALICE
论文作者
论文摘要
在$ \ sqrt {s} = 8 $ \ sqrt {s_ \ s_ \ mathrm {nnn} = 8.16 $ tev时，在PP碰撞中与Alice LHC的Alice检测器在Cern LHC上与Alice LHC的Alice检测器进行了轻中性的介子差不变横截面和核修饰因子测量。该分析结合了几种部分独立的重建技术的结果，其中$π^0 $和$η$梅森衰减光子是通过电磁热量计，EMCAL，eMCAL，光子光谱仪，PHOS或通过使用Alice Tradecter Tracking Materess的转换中的$ e^+E^ - $对进行的。达到$ p_ \ mathrm {t} $ 200 Gev/$ c $ poses的中性触发测量值是迄今为止最高的确定粒子谱，而$η$ meson的测量值是前所未有的$ p_ \ mathrm {t} $ 50 gev/$ c $。发现光谱通常被NLO PQCD计算高估了。两个介子的核修饰因子均表现出$ p_ \ mathrm {t} <10 $ gev/$ c $的抑制作用，与以前的测量值相比，$ \ sqrt {s_ \ mathrm {nn}} = 5.02 $ tev且与CGC和冷核问题损失一致。对于$ P_ \ Mathrm {t}> 10 $ GEV/$ C $，$ r_ \ MATHRM {PPB} $与Unity和Theory Theection的预测一致。
Light neutral meson differential invariant cross section and nuclear modification factor measurements have been carried out with the ALICE detector at the CERN LHC in pp collisions at $\sqrt{s}=8$ TeV and p--Pb collisions at $\sqrt{s_\mathrm{NN}}=8.16$ TeV. The analysis combines results from several partially independent reconstruction techniques where the $π^0$ and $η$ meson decay photons were detected with the electromagnetic calorimeter, EMCal, the photon spectrometer, PHOS, or via reconstruction of $e^+e^-$ pairs from conversions in the ALICE detector material using the central tracking system. The neutral pion measurement reaching a $p_\mathrm{T}$ of 200 GeV/$c$ poses as the highest measured identified particle spectrum to date while the $η$ meson is measured to an unprecedented $p_\mathrm{T}$ of 50 GeV/$c$. The spectra are found to be generally overestimated by NLO pQCD calculations. The nuclear modification factors of both mesons exhibit a suppression for $p_\mathrm{T}<10$ GeV/$c$ which is stronger compared to previous measurements at $\sqrt{s_\mathrm{NN}}=5.02$ TeV and consistent with CGC and cold nuclear matter energy loss calculations. For $p_\mathrm{T}>10$ GeV/$c$, $R_\mathrm{pPb}$ is consistent with unity and theory predictions.
