Underlying-event properties in pp and p–Pb collisions at $$ \sqrt{s_{\textrm{NN}}} $$ = 5.02 TeV
Underlying-event properties in pp and p–Pb collisions at $$ \sqrt{s_{\textrm{NN}}} $$ = 5.02 TeV
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pp 和 p–Pb 碰撞中的基础事件属性 $$ sqrt{s_{ extrm{NN}}} $$ = 5.02 TeV
DOI：
10.1007/jhep06(2023)023
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发表时间：
2023
影响因子：
5.4
通讯作者：
Ahuja, I.
中科院分区：
文献类型：
--
作者：
Acharya, S.;Adamová, D.;Adler, A.;Aglieri Rinella, G.;Agnello, M.;Agrawal, N.;Ahammed, Z.;Ahmad, S.;Ahn, S. U.;Ahuja, I.
我们报告的基本事件测量ALICE在LHC在pp和p-Pb碰撞在sNN = 5.02 TeV的属性。的事件活动，量化的带电粒子数和总和-PT密度，测量作为一个功能的领先粒子的横向动量（PTHRR）。这些量的研究在三个方位角区域相对于领先的粒子的事件：朝向，远离，和横向。结果给出了三种不同的p-T阈值（0.15，0.5和1 GeV/c）在中赝快度（|η| < 0.8）。横向区域的事件活动，这是最敏感的基础事件，表现出类似的行为，在pp和p-Pb碰撞，即，陡峭的增加与pTdR为低pTdR，其次是饱和在pTdR = 5 GeV/c。PP碰撞的结果进行了比较，与现有的测量在其他中心的质量能量。在减去横向区域中测量的贡献之后，还分析了朝向区域和远离区域中的量。剩余的喷流状粒子密度是一致的pp和p-Pb碰撞的pTdR>10 GeV/c，而较低的pTdR值的事件活动是略高于在pp碰撞的p-Pb。测量结果与PYTHIA 8和EPOS LHC Monte Carlo事件发生器的预测进行了比较。[图不可用：见全文。]
We report about the properties of the underlying event measured with ALICE at the LHC in pp and p–Pb collisions at sNN = 5.02 TeV. The event activity, quantified by charged-particle number and summed-p T densities, is measured as a function of the leading-particle transverse momentum (pTtrig) . These quantities are studied in three azimuthal-angle regions relative to the leading particle in the event: toward, away, and transverse. Results are presented for three different p T thresholds (0.15, 0.5 and 1 GeV/c) at mid-pseudorapidity (|η| < 0.8). The event activity in the transverse region, which is the most sensitive to the underlying event, exhibits similar behaviour in both pp and p–Pb collisions, namely, a steep increase with pTtrig for low pTtrig , followed by a saturation at pTtrig≈5 GeV/c. The results from pp collisions are compared with existing measurements at other centre-of-mass energies. The quantities in the toward and away regions are also analyzed after the subtraction of the contribution measured in the transverse region. The remaining jet-like particle densities are consistent in pp and p–Pb collisions for pTtrig>10 GeV/c, whereas for lower pTtrig values the event activity is slightly higher in p–Pb than in pp collisions. The measurements are compared with predictions from the PYTHIA 8 and EPOS LHC Monte Carlo event generators. [Figure not available: see fulltext.].