Evidence for Similar Collectivity of High Transverse-Momentum Particles in <math display="inline"><mi>p</mi></math>-Pb and Pb-Pb Collisions
(2025) Physical Review Letters — Vol. 135 (2025)
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- Charged hadron elliptic anisotropies (<math display="inline"><mrow><msub><mrow><mi>v</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math>) are presented over a wide transverse momentum (<math display="inline"><mrow><msub><mrow><mi>p</mi></mrow><mrow><mi mathvariant="normal">T</mi></mrow></msub></mrow></math>) range for proton-lead (<math display="inline"><mrow><mi>p</mi><mi>Pb</mi></mrow></math>) and lead-lead (PbPb) collisions at nucleon-nucleon center-of-mass energies of 8.16 and 5.02 TeV, respectively. The data were marc:recorded by the CMS experiment and correspond to integrated luminosities of 186 and <math display="inline"><mrow><mn>0.607</mn><mtext> </mtext><mtext> </mtext><msup><mrow><mi>nb</mi></mrow><mrow><mo>-</mo><mn>1</mn></mrow></msup></mrow></math> for the <math display="inline"><mi>p</mi><mi>Pb</mi></math> and PbPb systems, respectively. A four-particle cumulant analysis is performed using subevents separated in pseudorapidity to effectively suppress noncollective effects. At high <math display="inline"><msub><mi>p</mi><mi mathvariant="normal">T</mi></msub></math> (<math display="inline"><mrow><msub><mrow><mi>p</mi></mrow><mrow><mi mathvariant="normal">T</mi></mrow></msub><mo>></mo><mn>8</mn><mtext> </mtext><mtext> </mtext><mi>GeV</mi></mrow></math>), significant positive <math display="inline"><msub><mi>v</mi><mn>2</mn></msub></math> values that are similar between <math display="inline"><mi>p</mi><mi>Pb</mi></math> and PbPb collisions at comparable charged particle multiplicities are observed. This observation suggests a common origin for the multiparticle collectivity for high-<math display="inline"><msub><mi>p</mi><mi mathvariant="normal">T</mi></msub></math> particles in the two systems.
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Jain, S., Bein, S., Benecke, A., Bethani, A., Bruno, G., Caputo, C., de Favereau de Jeneret, J., Delaere, C., Donertas, I. S., Giammanco, A., Guzel, A., Jain, S., Lemaitre, V., Lidrych, J., Mastrapasqua, P., Tran, T. T., Turkcapar, S., CMS, & et al. (2025). Evidence for Similar Collectivity of High Transverse-Momentum Particles in <math display=“inline”><mi>p</mi></math>-Pb and Pb-Pb Collisions. Physical Review Letters, 135. https://doi.org/10.1103/t5kp-vsv7 (Original work published 2025)