Production of $\omega$ mesons in pp collisions at $\sqrt{s}$ = 7 TeV

Abstract

The invariant differential cross section of inclusive $\omega (782)$ meson production at midrapidity ($|y|<0.5$) in pp collisions at $\sqrt{s}$ = 7 TeV was measured with the ALICE detector at the LHC over a transverse momentum range of 2 < $p_{\mathrm{T}}$ < 17 GeV/$c$. The $\omega$ meson was reconstructed via its $\omega \to {\pi }^{+}{\pi }^{-}{\pi }^0$ decay channel. The measured $\omega$ production cross section is compared to various calculations: PYTHIA 8.2 Monash 2013 describes the data, while PYTHIA 8.2 Tune 4C overestimates the data by about 50%. A recent NLO calculation, which includes a model describing the fragmentation of the whole vector-meson nonet, describes the data within uncertainties below 6 GeV/$c$, while it overestimates the data by up to 50% for higher $p_{\mathrm{T}}$. The $\omega /{\pi }^0$ ratio is in agreement with previous measurements at lower collision energies and the PYTHIA calculations. In addition, the measurement is compatible with transverse mass scaling within the measured $p_{\mathrm{T}}$ range and the ratio is constant with $C^{\omega /{\pi }^0}$ = 0.67 $\pm$ 0.03 (stat) $\pm$ 0.04 (sys) above a transverse momentum of 2.5 GeV/$c$.

arXiv comment21 pages, 5 captioned figures, 2 tables, authors from page 16, version published, figures at http://alice-publications.web.cern.ch/node/6646

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