Multiplicity dependence of $\Upsilon$ production at forward rapidity in pp collisions at $\sqrt{s}$ = 13 TeV

The ALICE collaboration
Nucl.Phys.B 1011 (2025) 116786, 2025.

Abstract (data abstract)
The measurement of $\Upsilon$(1S), $\Upsilon$(2S), and $\Upsilon$(3S) yields as a function of the charged-particle multiplicity density $\textrm{d}N_{\textrm{ch}}/\textrm{d}\eta$, using the ALICE experiment at the LHC, is reported in pp collisions at $\sqrt{s} =$ 13 TeV. The $\Upsilon$ 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 ($|\eta| < 1$). Both quantities are divided by their average value in minimum bias events to compute the self-normalized quantities.

  • Figure 2 UPS(1S) vs mult

    Data from Figure 2 UPS(1S)

    10.17182/hepdata.156765.v1/t1

    Self-normalized Upsilon(1S) yield as a function of the self-normalized charged-particle multiplicity.

  • Figure 2 UPS(2S) vs mult

    Data from Figure 2 UPS(2S)

    10.17182/hepdata.156765.v1/t2

    Self-normalized Upsilon(2S) yield as a function of the self-normalized charged-particle multiplicity.

  • Figure 2 UPS(3S) vs mult

    Data from Figure 2 UPS(3S)

    10.17182/hepdata.156765.v1/t3

    Self-normalized Upsilon(3S) yield as a function of the self-normalized charged-particle multiplicity.

  • Figure 4 Double ratio of UPS(2S) to UPS(1S) vs mult

    Data from Figure 4 Top

    10.17182/hepdata.156765.v1/t4

    Self-normalized Upsilon(2S) to Upsilon(1S) yield ratio as a function of the self-normalized charged-particle multiplicity.

  • Figure 4 Double ratio of UPS(3S) to UPS(1S) vs mult

    Data from Figure 4 Bottom

    10.17182/hepdata.156765.v1/t5

    Self-normalized Upsilon(3S) to Upsilon(1S) yield ratio as a function of the self-normalized charged-particle multiplicity.

  • Figure 5 Double ratio of UPS(1S) to JPSI vs mult

    Data from Figure 5 Bottom

    10.17182/hepdata.156765.v1/t6

    Self-normalized Upsilon(1S) to J/PSI yield ratio as a function of the self-normalized charged-particle multiplicity.

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