Light neutral-meson production in pp collisions at $\sqrt{s}$ = 13 TeV - INSPIRE

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Light neutral-meson production in pp collisions at $\sqrt{s}$ = 13 TeV

ALICE

Collaboration

Nov 14, 2024

39 pages

e-Print:

2411.09560 [hep-ex]

Report number:

CERN-EP-2024-304

Experiments:

CERN-LHC-ALICE

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Abstract: (arXiv)

The momentum-differential invariant cross sections of

{\pi^{0}}

and

\eta

mesons are reported for pp collisions at

\sqrt{s}

= 13 TeV at midrapidity (

|y|<0.8

). The measurement is performed in a broad transverse-momentum range of

0.2<p_{\rm T}<200

GeV/

c

and

0.4<p_{\rm T}<60

GeV/

c

for the

{\pi^{0}}

and

\eta

, respectively, extending the

p_{\rm T}

coverage of previous measurements. Transverse-mass-scaling violation of up to 60% at low transverse momentum has been observed, agreeing with measurements at lower collision energies. Transverse Bjorken

x

(

x_{\rm T}

) scaling of the

{\pi^{0}}

cross sections at LHC energies is fulfilled with a power-law exponent of

n

= 5.01

\pm

0.05, consistent with values obtained for charged pions at similar collision energies. The data is compared to predictions from next-to-leading order perturbative QCD calculations, where the

{\pi^{0}}

spectrum is best described using the CT18 parton distribution function and the NNFF1.0 or BDSS fragmentation function. Expectations from PYTHIA8 and EPOS LHC overestimate the spectrum for the

{\pi^{0}}

and are not able to describe the shape and magnitude of the

\eta

spectrum. The charged-particle multiplicity dependent

{\pi^{0}}

and

\eta

p_{\rm T}

spectra show the expected hardening with increasing multiplicity. This is demonstrated across a broad transverse-momentum range and up to events with a charged-particle multiplicity exceeding five times the mean value in minimum bias collisions. The absolute magnitude of the

\eta/\pi^{0}

ratio shows a dependence on the charged-particle multiplicity for

p_{\rm T}<4

GeV/

c

, qualitatively described by PYTHIA8 and EPOS LHC due to a rising contribution from feed-down of heavier particles to the

{\pi^{0}}

spectrum.

Note:

39 pages, 13 captioned figures, 9 tables, authors from page 33, submitted to JHEP, figures at http://alice-publications.web.cern.ch/node/11738

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