User

Roles
Anonymous

Underlying-event properties in pp and p$-$Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV

Description
Figures from paper submitted to Journal of High Energy Physics
Abstract:

We report about the properties of the underlying event measured with ALICE at the LHC in pp and p$-$Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV. The event activity, quantified by charged-particle number and summed-$p_{\rm T}$ densities, is measured as a function of the leading-particle transverse momentum ($p_{\rm T}^{\rm trig}$). 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 $p_{\rm T}$ thresholds (0.15, 0.5, and 1 GeV/$c$) at mid-pseudorapidity ($|\eta|<~0.8$). 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 $p_{\rm T}^{\rm trig}$ for low $p_{\rm T}^{\rm trig}$, followed by a saturation at $p_{\rm T}^{\rm trig} \approx 5$ 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 $p_{\rm T}^{\rm trig}>10$ GeV/$c$, whereas for lower $p_{\rm T}^{\rm trig}$ 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.

JHEP 06 (2023) 023
e-Print: arXiv:2204.10389 | PDF | inSPIRE

Paper:

Figure 1
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
regions_12.png
Figure 2a
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
All_TS_pp_NumDen_3.eps
Figure 2b
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
All_TS_pPb_NumDen_3.eps
Figure 3a
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
figure3left_3.eps
Figure 3b
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
figure3right_3.eps
Figure 4a
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_pp5NumDen5_TS_3.eps
Figure 4b
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_pp5SumPt5_TS_3.eps
Figure 4c
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_pp5NumDen5_AS_3.eps
Figure 4d
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_pp5SumPt5_AS_3.eps
Figure 4e
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_pp5NumDen5_NS_2.eps
Figure 4f
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_pp5SumPt5_NS_2.eps
Figure 5a
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_ppbNumDen5_TS_2.eps
Figure 5b
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_ppbSumPt5_TS_2.eps
Figure 5c
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_ppbNumDen5_AS_2.eps
Figure 5d
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_ppbSumPt5_AS_2.eps
Figure 5e
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_ppbNumDen5_NS_2.eps
Figure 5f
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_ppbSumPt5_NS_2.eps
Figure 6a
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
hModelASTS_NumDen_Ratio_5_2.eps
Figure 6b
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
hModelASTS_SumPt_Ratio_5_2.eps
Figure 6c
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
hModelNSTS_NumDen_Ratio_5_0.eps
Figure 6d
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
hModelNSTS_SumPt_Ratio_5_0.eps
Figure 7a
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
Modelaverge_pt_near_nsts_5.eps
Figure 7b
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
Modelaverge_pt_away_asts_5.eps
Figure 8a
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
all_energy_ppcollisn.eps
Figure 8b
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
all_energy_ppcollisn2.eps
Figure 9
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
figure7.eps
Figure A.1a
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_pp5NumDen15_TS.eps
Figure A.1b
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_pp5SumPt15_TS.eps
Figure A.1c
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_pp5NumDen15_AS_1.eps
Figure A.1d
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_pp5SumPt15_AS.eps
Figure A.1e
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_pp5NumDen15_NS.eps
Figure A.1f
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_pp5SumPt15_NS.eps
Figure A.2a
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_pp5NumDen1_TS.eps
Figure A.2b
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_pp5SumPt1_TS.eps
Figure A.2c
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_pp5NumDen1_AS.eps
Figure A.2d
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_pp5SumPt1_AS.eps
Figure A.2e
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_pp5NumDen1_NS.eps
Figure A.2f
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_pp5SumPt1_NS.eps
Figure A.3a
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_ppbNumDen15_TS.eps
Figure A.3b
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_ppbSumPt15_TS_0.eps
Figure A.3c
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_ppbNumDen15_AS.eps
Figure A.3d
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_ppbSumPt15_AS.eps
Figure A.3e
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_ppbNumDen15_NS.eps
Figure A.3f
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_ppbSumPt15_NS.eps
Figure A.4a
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_ppbNumDen1_TS.eps
Figure A.4b
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_ppbSumPt1_TS.eps
Figure A.4c
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_ppbNumDen1_AS.eps
Figure A.4d
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_ppbSumPt1_AS.eps
Figure A.4e
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_ppbNumDen1_NS.eps
Figure A.4f
Energy
5.02 TeV
System
p-p
p-Pb
Scope: PWG
PWG-MM (Monte Carlo generators and Minimum Bias)
Figure image (.eps)
ModelCompare_ppbSumPt1_NS.eps