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

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doi:10.1140/epjc/s10052-020-08651-y

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

Journal Article · Mon Dec 07 00:00:00 EST 2020 · European Physical Journal. C, Particles and Fields

DOI:https://doi.org/10.1140/epjc/s10052-020-08651-y· OSTI ID:1787258

Acharya, S.; Adamová, D.; Adler, A.; Adolfsson, J.; Aggarwal, M. M.; Agha, S.; Aglieri Rinella, G.; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahmad, S.; Ahn, S. U.; Akbar, Z.; Akindinov, A.; Al-Turany, M.; Alam, S. N.; Albuquerque, D. D.; Aleksandrov, D.; Alessandro, B.; Alfanda, H. M. more »

The invariant differential cross section of inclusive $\omega (782)$ meson production at midrapidity ($|y|<0.5$) in pp collisions at $\sqrt{s}=7\,\hbox {TeV}$ was measured with the ALICE detector at the LHC over a transverse momentum range of $2< p_{\mathrm {T}}< 17\,\hbox {GeV}/c$. The $\omega $ meson was reconstructed via its $\omega \rightarrow \pi ^+\pi ^-\pi ^0$ 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 $6\,\hbox {GeV}/c$, 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 $C^{\omega /\pi ^{0}}= 0.67 \pm 0.03 \text {~(stat)~} \pm 0.04 \text {~(sys)~}$ above a transverse momentum of $2.5\,\hbox {GeV}/c$.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: ALICE Collaboration

Grant/Contract Number:: AC02-05CH11231; AC05-00OR22725

OSTI ID:: 1787258

Alternate ID(s):: OSTI ID: 1822025
OSTI ID: 1798746
OSTI ID: 23006134

Journal Information:: European Physical Journal. C, Particles and Fields, Journal Name: European Physical Journal. C, Particles and Fields Journal Issue: 12 Vol. 80; ISSN 1434-6044

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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