Multiplicity dependence of $Υ$ production at forward rapidity in pp collisions at $\sqrt{s}$ = 13 TeV
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arXiv
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| Format: | Preprint |
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2022
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| _version_ | 1866916565955379200 |
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| author | ALICE Collaboration |
| author_facet | ALICE Collaboration |
| contents | The measurement of $Υ$(1S), $Υ$(2S), and $Υ$(3S) yields as a function of the charged-particle multiplicity density, $\textrm{d}N_{\textrm{ch}}/\textrm{d}η$, using the ALICE experiment at the LHC, is reported in pp collisions at $\sqrt{s} =$ 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 divided by their average value in minimum bias events to compute the self-normalized quantities. 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 $\textrm{d}N_{\textrm{ch}}/\textrm{d}η$, within the uncertainties. The self-normalized yield ratios of excited-to-ground $Υ$ states 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 multiplicities beyond one. The measurements are compared with theoretical predictions incorporating initial or final state effects. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2209_04241 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Multiplicity dependence of $Υ$ production at forward rapidity in pp collisions at $\sqrt{s}$ = 13 TeV ALICE Collaboration Nuclear Experiment The measurement of $Υ$(1S), $Υ$(2S), and $Υ$(3S) yields as a function of the charged-particle multiplicity density, $\textrm{d}N_{\textrm{ch}}/\textrm{d}η$, using the ALICE experiment at the LHC, is reported in pp collisions at $\sqrt{s} =$ 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 divided by their average value in minimum bias events to compute the self-normalized quantities. 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 $\textrm{d}N_{\textrm{ch}}/\textrm{d}η$, within the uncertainties. The self-normalized yield ratios of excited-to-ground $Υ$ states 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 multiplicities beyond one. The measurements are compared with theoretical predictions incorporating initial or final state effects. |
| title | Multiplicity dependence of $Υ$ production at forward rapidity in pp collisions at $\sqrt{s}$ = 13 TeV |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2209.04241 |