Neutral pion and $\eta$ meson production in p-Pb collisions at $\sqrt{s_\mathrm{NN}} = 5.02$ TeV - INSPIRE

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Neutral pion and $\eta$ meson production in p-Pb collisions at $\sqrt{s_\mathrm{NN}} = 5.02$ TeV

ALICE

Collaboration

Jan 22, 2018

34 pages

Published in:

Eur.Phys.J.C 78 (2018) 8, 624

Published: Aug 6, 2018

e-Print:

1801.07051 [nucl-ex]

DOI:

10.1140/epjc/s10052-018-6013-8

Report number:

CERN-EP-2018-002

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (Springer)

Neutral pion and

\eta

meson invariant differential yields were measured in non-single diffractive p–Pb collisions at

\sqrt{s_{\mathrm{NN}}}

= 5.02 TeV with the ALICE experiment at the CERN LHC. The analysis combines results from three complementary photon measurements, utilizing the PHOS and EMCal calorimeters and the Photon Conversion Method. The invariant differential yields of

\pi ^{0}

and

\eta

meson inclusive production are measured near mid-rapidity in a broad transverse momentum range of

0.3< p_{\mathrm{T}} < 20 \hbox { GeV}/c

and

0.7< p_{\mathrm{T}} < 20\hbox { GeV}/c

, respectively. The measured

\eta /\pi ^{0}

ratio increases with

p_{\mathrm{T}}

and saturates for

p_{\mathrm{T}}

> 4

\hbox {GeV}/c

at

0.483 \pm 0.015_{\mathrm{stat}} \pm 0.015_{\mathrm{sys}}

. A deviation from

m_{\mathrm{T}}

scaling is observed for

p_{\mathrm{T}}<

2

\hbox {GeV}/c

. The measured

\eta /\pi ^{0}

ratio is consistent with previous measurements from proton-nucleus and pp collisions over the full

p_{\mathrm{T}}

range. The measured

\eta /\pi ^{0}

ratio at high

p_{\mathrm{T}}

also agrees within uncertainties with measurements from nucleus–nucleus collisions. The

\pi ^{0}

and

\eta

yields in p–Pb relative to the scaled pp interpolated reference,

R_{{\mathrm{pPb}}}

, are presented for

0.3 < p_{\mathrm{T}}<

20

\hbox {GeV}/c

and

0.7 < p_{\mathrm{T}}<

20

\hbox {GeV}/c

, respectively. The results are compared with theoretical model calculations. The values of

R_{{\mathrm{pPb}}}

are consistent with unity for transverse momenta above 2

\hbox {GeV}/c

. These results support the interpretation that the suppressed yield of neutral mesons measured in Pb–Pb collisions at LHC energies is due to parton energy loss in the hot QCD medium.

Note:

34 pages, 11 captioned figures, 5+1 tables, authors from page 29, submitted to EPJC, figures at http://aliceinfo.cern.ch/ArtSubmission/node/4156

pi0: production
eta: production
meson: inclusive production
parton: energy loss
photon: transition
p nucleus: scattering
heavy ion: scattering
p p: scattering
nucleus nucleus: scattering
transverse momentum

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