Measurement of the average transverse momentum of forward prompt charged particles in pp and pPb collisions at √s_NN = 5.02 TeV

2026/07/29 by LHCb collaboration, R. Aaij, M. Abdelfatah +1106
Physics and Astronomy · #nucl-ex

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All figures and tables, along with any supplementary material and additional information, are available at https://lhcb-glance.cern.ch/alcm/public/analysis/full-details/5570/ (LHCb public pages)

arxiv created 2026/07/29 · arxiv updated 2026/07/30

Abstract

This letter presents the first measurements of the average transverse momentum of prompt charged particles in pp and pPb collisions as a function of collision multiplicity and pseudorapidity. The data were recorded at nucleon-nucleon centre-of-mass energy √s_NN = 5.02 TeV with the LHCb experiment. The pseudorapidity dependence of the multiplicity distribution is also measured. The average transverse momentum results show a decreasing trend with pseudorapidity, more pronounced in high-multiplicity events, consistent with the collective behaviour of the produced matter. The measurements are reproduced by state-of-the-art (3+1D) hydrodynamic calculations, while saturation models are not compatible with the data.

Citations

• Longitudinal Dynamics of Large and Small Systems from a 3D Bayesian Calibration of RHIC Top-energy Collision Data
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