Measurement of $\omega$ meson production in pp collisions at $\sqrt{s}$ = 13 TeV

The ALICE collaboration
JHEP 04 (2025) 067, 2025.

Abstract (data abstract)
CERN-LHC. The $p_{\rm T}$-differential cross section of $\omega$ meson production in pp collisions at $\sqrt{s}=13$ TeV at midrapidity ($|y|<0.5$) was measured with the ALICE detector at the LHC, covering an unprecedented transverse-momentum range of $1.6<p_{\rm T}<50$ GeV/c. The meson is reconstructed via the $\omega\rightarrow\pi^+\pi^-\pi^0$ decay channel. The results are compared with various theoretical calculations: PYTHIA8.2 with the Monash 2013 tune overestimates the data by up to 50\%, whereas good agreement is observed with Next-to-Leading Order (NLO) calculations incorporating $\omega$ fragmentation using a broken SU(3) model. The $\omega/\pi^0$ ratio is presented and compared with theoretical calculations and the available measurements at lower collision energies. The presented data triples the $p_{\rm T}$ ranges of previously available measurements. A constant ratio of $C^{\omega/\pi^0}=0.578\pm0.006~\text{(stat.)}\pm 0.013~\text{(syst.)}$ is found above a transverse momentum of $4$ GeV/c, which is in agreement with previous findings at lower collision energies within the systematic and statistical uncertainties.

  • Table 1

    Data from Fig. 4

    10.17182/hepdata.157865.v1/t1

    Invariant differential cross section of OMEGA mesons produced in inelastic pp collisions at center-of-mass energy 13 TeV, the uncertainty of...

  • Table 2

    Data from Fig. 5

    10.17182/hepdata.157865.v1/t2

    The measured ratio of cross sections for inclusive OMEGA to PI0 production at a centre-of-mass energy of 13 TeV.

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