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

Abstract

The $p_{\mathrm{T}}$-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 $1.6<p_{\mathrm{T}}<50$ GeV/$c$. The meson is reconstructed via the $\omega \to {\pi }^{+}{\pi }^{-}{\pi }^0$ 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 $p_{\mathrm{T}}$ ranges of previously available measurements. A constant ratio of $C^{\omega /{\pi }^0}=0.578\pm 0.006\text{(stat.)}\pm 0.013\text{(syst.)}$ 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.

26 pages, 5 captioned figures, 1 table, authors from page 20, figures at http://alice-publications.web.cern.ch/node/11737

References in corpus (5)

• An Introduction to PYTHIA 8.2
• Tuning PYTHIA 8.1: the Monash 2013 Tune
• Interleaved Parton Showers and Tuning Prospects
• Parton-to-Pion Fragmentation Reloaded
• A determination of the fragmentation functions of pions, kaons, and protons with faithful uncertainties

Cited by in corpus (1)

• Measurement of $\omega$ meson production in pp and p$-$Pb collisions at $\sqrt{{\mathbf{s}}_{\mathrm{NN}}}=5.02$ TeV