Emergence of long-range angular correlations in low-multiplicity proton-proton Collisions
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 √=13 TeV. Long-range ridge yields are extracted for pairs of charged particles with a pseudorapidity dif...
| Authors: | , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2024 |
| Country: | Brasil |
| Institution: | Universidade Federal do Rio Grande do Sul (UFRGS) |
| Repository: | Repositório Institucional da UFRGS |
| Language: | English |
| OAI Identifier: | oai:www.lume.ufrgs.br:10183/281520 |
| Online Access: | http://hdl.handle.net/10183/281520 |
| Access Level: | Open access |
| Keyword: | Colisões proton-proton Colisões hadrônicas Aceleradores de partículas |
| Summary: | 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 √=13 TeV. Long-range ridge yields are extracted for pairs of charged particles with a pseudorapidity difference of 1.4<|Δ|<1.8 and a transverse momentum of 1<T<2 GeV/, 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 √=91 GeV and √=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≲⟨ch⟩≲24 where the e+e− results have good precision, the measured ridge yields in 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 collisions. |
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