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Observation of flow vector fluctuations in p–Pb collisions at √sNN = 5.02TeV

Journal articles  - Journal Article
Abdallah, DAH; Abualrob, IJ; Acharya, S; Aglieri Rinella, G; Aglietta, L; Agrawal, N; Ahammed, Z; Ahmad, S; Ahuja, I; Akbar, Z; Akishina, V ...
Published in: Journal of High Energy Physics
June 1, 2026

Measurements of transverse momentum (pT) and pseudorapidity (η) dependent flow vector fluctuations in p–Pb collisions at TeV at the CERN Large Hadron Collider are presented. By studying long-range two-particle correlations with a template fit method, potential biases from non-flow effects such as jets and resonance decays are effectively suppressed. Significant pT- and η-dependent fluctuations of the second-harmonic flow vector are observed with more than 5σ confidence in p–Pb collisions, similar to the observations in Pb–Pb collisions. The influence of residual non-flow effects has been evaluated and cannot account for the observed fluctuations, thereby confirming the observation of flow vector fluctuations in small collision systems at the LHC. Comparisons to model calculations from 3DGlauber+MUSIC+UrQMD and the parton transport model from AMPT are also presented. The measurements provide constraints on the theoretical modelling of the three-dimensional initial geometry and its event-by-event fluctuations, offering critical insights into the origin of collective flow in small collision systems at the LHC.

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Published In

Journal of High Energy Physics

DOI

EISSN

1029-8479

Publication Date

June 1, 2026

Volume

2026

Issue

6

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5106 Nuclear and plasma physics
  • 4902 Mathematical physics
 

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Abdallah, D. A. H., Abualrob, I. J., Acharya, S., Aglieri Rinella, G., Aglietta, L., Agrawal, N., … Blidaru, M. B. (2026). Observation of flow vector fluctuations in p–Pb collisions at √sNN = 5.02TeV. Journal of High Energy Physics, 2026(6). https://doi.org/10.1007/JHEP06(2026)152
Abdallah, D. A. H., I. J. Abualrob, S. Acharya, G. Aglieri Rinella, L. Aglietta, N. Agrawal, Z. Ahammed, et al. “Observation of flow vector fluctuations in p–Pb collisions at √sNN = 5.02TeV.” Journal of High Energy Physics 2026, no. 6 (June 1, 2026). https://doi.org/10.1007/JHEP06(2026)152.
Abdallah DAH, Abualrob IJ, Acharya S, Aglieri Rinella G, Aglietta L, Agrawal N, et al. Observation of flow vector fluctuations in p–Pb collisions at √sNN = 5.02TeV. Journal of High Energy Physics. 2026 Jun 1;2026(6).
Abdallah, D. A. H., et al. “Observation of flow vector fluctuations in p–Pb collisions at √sNN = 5.02TeV.” Journal of High Energy Physics, vol. 2026, no. 6, June 2026. Scopus, doi:10.1007/JHEP06(2026)152.
Abdallah DAH, Abualrob IJ, Acharya S, Aglieri Rinella G, Aglietta L, Agrawal N, Ahammed Z, Ahmad S, Ahuja I, Akbar Z, Akishina V, Al-Turany M, Alessandro B, Alfaro Molina R, Ali B, Alici A, Alme J, Alocco G, Alt T, Altsybeev I, Andrei C, Andreou N, Andronic A, Angeletti M, Anguelov V, Antinori F, Antonioli P, Apadula N, Appelshäuser H, Arcelli S, Arnaldi R, Arsene IC, Arslandok M, Augustinus A, Averbeck R, Azmi MD, Baba H, Babu ARJ, Badalà A, Bae J, Bae Y, Baek YW, Bai X, Bailhache R, Bailung Y, Bala R, Baldisseri A, Balis B, Bangalia S, Banoo Z, Barbasova V, Barile F, Barioglio L, Barlou M, Barman B, Barnaföldi GG, Barnby LS, Barreau E, Barret V, Barreto L, Barth K, Bartsch E, Bastid N, Batigne G, Battistini D, Batyunya B, Baudino L, Bauri D, Bazo Alba JL, Bearden IG, Becht P, Behera D, Behera S, Behling MAC, Belikov I, Bella VD, Bellini F, Bellwied R, Beltran LGE, Beltran YAV, Bencedi G, Benchikhi O, Bensaoula A, Beole S, Berdnikova A, Bergmann L, Bernardinis L, Betev L, Bhaduri PP, Bhalla T, Bhasin A, Bhattacharjee B, Bianchi L, Bielčík J, Bielčíková J, Bilandzic A, Binoy A, Biro G, Biswas S, Blidaru MB. Observation of flow vector fluctuations in p–Pb collisions at √sNN = 5.02TeV. Journal of High Energy Physics. 2026 Jun 1;2026(6).
Journal cover image

Published In

Journal of High Energy Physics

DOI

EISSN

1029-8479

Publication Date

June 1, 2026

Volume

2026

Issue

6

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5106 Nuclear and plasma physics
  • 4902 Mathematical physics