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Preprint
Report number arXiv:2209.04241 ; CERN-EP-2022-174
Title Multiplicity dependence of Υ production at forward rapidity in pp collisions at s = 13 TeV
Author(s) ALICE Collaboration  Show all 1046 authors
Corporate author(s) The ALICE collaboration
Publication 2022
Imprint 12 Aug 2022
Number of pages 27
Note 27 pages, 5 captioned figures, updated models, 4 tables, submitted to NPB, figures at http://alice-publications.web.cern.ch/node/8399
Subject category Nuclear Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ALICE
Keywords QCD ; quarkonium ; heavy quark production ; experimental results
Abstract The measurement of Υ(1S), Υ(2S), and Υ(3S) yields as a function of the charged-particle multiplicity density dNch/dη, using the ALICE experiment at the LHC, is reported in pp collisions at s = 13 TeV. The Υ meson yields are measured at forward rapidity (2.5<y<4) in the dimuon decay channel, whereas the charged-particle multiplicity is defined at central rapidity (|η|<1). Both quantities are normalized to their average value in minimum bias events. The increase of the self-normalized Υ(1S), Υ(2S), and Υ(3S) yields is found to be compatible with a linear scaling with the self-normalized dNch/dη, within the uncertainties. The measured Υ excited-to-ground state self-normalized yield ratios are compatible with unity within uncertainties. Similarly, the measured double ratio of the self-normalized Υ(1S) to the self-normalized J/ψ yields, both measured at forward rapidity, is compatible with unity for self-normalized charged-particle multiplicity beyond one. The measurements are compared with theoretical predictions incorporating initial or final state effects.
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Copyright/License Preprint: © 2022-2025 CERN (License: CC-BY-4.0)
Submitted by francesco.prino@cern.ch



 


 Record created 2022-08-12, last modified 2025-01-08


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