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

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

ALICE

Collaboration

Jul 4, 2020

16 pages

Published in:

Eur.Phys.J.C 80 (2020) 12, 1130

e-Print:

2007.02208 [nucl-ex]

DOI:

10.1140/epjc/s10052-020-08651-y

Report number:

CERN-EP-2020-122

Experiments:

CERN-LHC-ALICE

View in:

reference search15 citations

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Abstract: (Springer)

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

.

Note:

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

p p: scattering
meson: production
vector meson: nonet
mass: scaling
PYTHIA
transverse momentum
differential cross section
fragmentation
CERN LHC Coll
ALICE

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