Emergence of Long-Range Angular Correlations in Low-Multiplicity Proton-Proton Collisions

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doi:10.1103/PhysRevLett.132.172302

Emergence of Long-Range Angular Correlations in Low-Multiplicity Proton-Proton Collisions

Journal Article · Fri Apr 26 00:00:00 EDT 2024 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.132.172302· OSTI ID:2341363

; ; ; Aglietta, L.; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »

This Letter presents the measurement of near-side associated per-trigger yields, denoted ridge yields, from the analysis of angular correlations of charged hadrons in proton-proton collisions at $\sqrt{s} = 13 TeV$ . Long-range ridge yields are extracted for pairs of charged particles with a pseudorapidity difference of $1.4 < | Δ η | < 1.8$ and a transverse momentum of $1 < p_{T} < 2 GeV / c$ , as a function of the charged-particle multiplicity measured at midrapidity. This Letter extends the measurements of the ridge yield to the low multiplicity region, where in hadronic collisions it is typically conjectured that a strongly interacting medium is unlikely to be formed. The precision of the new low multiplicity results allows for the first direct quantitative comparison with the results obtained in $e^{+} e^{-}$ collisions at $\sqrt{s} = 91 GeV$ and $\sqrt{s} = 183 - 209 GeV$ , where initial-state effects such as preequilibrium dynamics and collision geometry are not expected to play a role. In the multiplicity range $8 ≲ ⟨ N_{ch} ⟩ ≲ 24$ where the $e^{+} e^{-}$ results have good precision, the measured ridge yields in $p p$ collisions are substantially larger than the limits set in $e^{+} e^{-}$ annihilations. Consequently, the findings presented in this Letter suggest that the processes involved in $e^{+} e^{-}$ annihilations do not contribute significantly to the emergence of long-range correlations in $p p$ collisions.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: ALICE Collaboration

Grant/Contract Number:: AC05-00OR22725; FG02-96ER40982

OSTI ID:: 2341363

Alternate ID(s):: OSTI ID: 2404616
OSTI ID: 2568952

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 17 Vol. 132; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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