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Multiplicity dependence of the size of the common hadron emission source in pp collisions at the LHC

Description
Figures from paper submitted to European Physical Journal C - Particles and Fields
Abstract:

Femtoscopic analysis can shed light on hadron production in pp collisions. In this paper, proton-proton correlations measured in collisions at $\sqrt{s}=13.6$ TeV recorded with the ALICE detector at the LHC are presented. The analysis is based on the minimum bias dataset collected in 2022 following the upgrade of the ALICE detector and corresponds to an integrated luminosity of $19.3$ pb$^{-1}$. The increased integrated luminosity allows us, for the first time, to simultaneously measure the multiplicity and transverse-mass ($m_{\rm T}$) dependence of the size of the hadron-emitting source. Precise knowledge of the femtoscopic source size in pp collisions is a crucial ingredient for using femtoscopy to study the residual strong interaction among stable and unstable hadrons at the LHC. In this light, the source radius was determined from the measured correlation functions by assuming several state-of-the-art models of the nucleon$-$nucleon interactions. The consistency among the extracted radii demonstrates the robustness of the measurement with respect to interaction model assumptions. A comparison to femtoscopic radii measured in Pb$-$Pb collisions at $\sqrt{s}=5.02$ TeV reveals a markedly different multiplicity dependence in similar $m_{\rm T}$ intervals, providing new insight into the system-size dependence of particle emission dynamics.

e-Print: arXiv:2606.28098 | PDF | inSPIRE

Figure 1
Energy
13.6 TeV
System
p-p
Scope: PWG
PWG-CF (Flow and Correlations)
Figure image (.eps)
part_waves_comp_italic.eps
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part_waves_comp_italic.pdf
Figure 2
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NorfolkComparisons_italic.pdf
Figure 3a
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grid_pp_mt_0.pdf
Figure 3b
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grid_apap_mt_0.eps
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grid_apap_mt_0.pdf
Figure 4a
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grid_pp_mt_5.eps
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Figure 4b
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Figure 5a
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MtScaling_Run3_Eff.eps
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MtScaling_Run3_Eff.pdf
Figure 5b
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MtScaling_Run3_Core.pdf
Figure 6a
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Figure 6b
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Figure 7
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MultScaling_pp_Eff_pp_Pb.pdf
Figure A.1a
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Figure A.1b
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lambda_parameter_mt6_mult1_CR2.pdf
Figure A.2a
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Figure A.2b
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Figure A.3a
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Figure A.3b
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Figure A.4a
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Figure A.4b
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Figure A.5a
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Figure A.5b
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Figure A.6a
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Figure A.6b
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Figure A.7a
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Figure A.7b
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Figure A.8a
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Figure A.8b
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Figure A.9a
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Figure A.9b
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Figure A.10a
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Figure A.10b
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Figure A.11a
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Figure A.11b
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Figure A.12a
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Figure A.12b
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Figure A.13a
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Figure A.13b
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Figure A.14a
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Figure A.14b
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Figure A.15a
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Figure A.15b
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Figure A.16
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Figure A.17
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Figure A.18
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Figure A.19
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Figure A.20
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Figure A.21
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Figure A.22
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