π0 and η meson production in proton-proton collisions at √s=8 TeV

ALICE Collaboration

doi:10.1140/epjc/s10052-018-5612-8

π⁰ and η meson production in proton-proton collisions at √s=8 TeV

ALICE Collaboration

Department of Physics

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26 Scopus citations

Abstract

An invariant differential cross section measurement of inclusive π⁰ and η meson production at mid-rapidity in pp collisions at s=8 TeV was carried out by the ALICE experiment at the LHC. The spectra of π⁰ and η mesons were measured in transverse momentum ranges of 0.3<pT<35 GeV/c and 0.5<pT<35 GeV/c, respectively. Next-to-leading order perturbative QCD calculations using fragmentation functions DSS14 for the π⁰ and AESSS for the η overestimate the cross sections of both neutral mesons, although such calculations agree with the measured η/ π⁰ ratio within uncertainties. The results were also compared with PYTHIA 8.2 predictions for which the Monash 2013 tune yields the best agreement with the measured neutral meson spectra. The measurements confirm a universal behavior of the η/ π⁰ ratio seen for NA27, PHENIX and ALICE data for pp collisions from s=27.5 GeV to s=8 TeV within experimental uncertainties. A relation between the π⁰ and η production cross sections for pp collisions at s=8 TeV is given by mT scaling for pT>3.5 GeV/c. However, a deviation from this empirical scaling rule is observed for transverse momenta below pT<3.5 GeV/c in the η/ π⁰ ratio with a significance of 6.2 σ.

Original language	English (US)
Article number	263
Journal	European Physical Journal C
Volume	78
Issue number	3
DOIs	https://doi.org/10.1140/epjc/s10052-018-5612-8
State	Published - Mar 1 2018

All Science Journal Classification (ASJC) codes

Engineering (miscellaneous)
Physics and Astronomy (miscellaneous)

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10.1140/epjc/s10052-018-5612-8

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@article{e421404d11e144d2b5e45314d23fd341,

title = " π0 and η meson production in proton-proton collisions at √s=8 TeV",

abstract = "An invariant differential cross section measurement of inclusive π0 and η meson production at mid-rapidity in pp collisions at s=8 TeV was carried out by the ALICE experiment at the LHC. The spectra of π0 and η mesons were measured in transverse momentum ranges of 0.30 and AESSS for the η overestimate the cross sections of both neutral mesons, although such calculations agree with the measured η/ π0 ratio within uncertainties. The results were also compared with PYTHIA 8.2 predictions for which the Monash 2013 tune yields the best agreement with the measured neutral meson spectra. The measurements confirm a universal behavior of the η/ π0 ratio seen for NA27, PHENIX and ALICE data for pp collisions from s=27.5 GeV to s=8 TeV within experimental uncertainties. A relation between the π0 and η production cross sections for pp collisions at s=8 TeV is given by mT scaling for pT>3.5 GeV/c. However, a deviation from this empirical scaling rule is observed for transverse momenta below pT<3.5 GeV/c in the η/ π0 ratio with a significance of 6.2 σ.",

author = "{ALICE Collaboration} and S. Acharya and J. Adam and D. Adamov{\'a} and J. Adolfsson and Aggarwal, {M. M.} and {Aglieri Rinella}, G. and M. Agnello and N. Agrawal and Z. Ahammed and N. Ahmad and Ahn, {S. U.} and S. Aiola and A. Akindinov and M. Al-Turany and Alam, {S. N.} and Alba, {J. L.B.} and Albuquerque, {D. S.D.} and D. Aleksandrov and B. Alessandro and {Alfaro Molina}, R. and A. Alici and A. Alkin and J. Alme and T. Alt and L. Altenkamper and I. Altsybeev and Prado, {C. Alves Garcia} and C. Andrei and D. Andreou and Andrews, {H. A.} and A. Andronic and V. Anguelov and C. Anson and T. Anti{\v c}i{\'c} and F. Antinori and P. Antonioli and R. Anwar and L. Aphecetche and H. Appelsh{\"a}user and S. Arcelli and R. Arnaldi and Arnold, {O. W.} and Arsene, {I. C.} and M. Arslandok and B. Audurier and A. Augustinus and R. Averbeck and Azmi, {M. D.} and A. Badal{\`a} and Seger, {J. E.}",

note = "Funding Information: This study was financially supported by the “Kiturami” Faculty Research Assistance Program of Yonsei University College of Medicine ( 6-2012-0148 ), and by the National Research Foundation through a grant funded by the Korean Government (MEST, Basic Research Promotion Fund; NRF-2010-013-E0008 and NRF-2012-000891 ). Publisher Copyright: {\textcopyright} 2018, CERN for the benefit of the ALICE collaboration.",

year = "2018",

month = mar,

day = "1",

doi = "10.1140/epjc/s10052-018-5612-8",

language = "English (US)",

volume = "78",

journal = "Zeitschrift fur Physik C-Particles and Fields",

issn = "1434-6044",

publisher = "Springer New York",

number = "3",

}

TY - JOUR

T1 - π0 and η meson production in proton-proton collisions at √s=8 TeV

AU - ALICE Collaboration

AU - Acharya, S.

AU - Adam, J.

AU - Adamová, D.

AU - Adolfsson, J.

AU - Aggarwal, M. M.

AU - Aglieri Rinella, G.

AU - Agnello, M.

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahmad, N.

AU - Ahn, S. U.

AU - Aiola, S.

AU - Akindinov, A.

AU - Al-Turany, M.

AU - Alam, S. N.

AU - Alba, J. L.B.

AU - Albuquerque, D. S.D.

AU - Aleksandrov, D.

AU - Alessandro, B.

AU - Alfaro Molina, R.

AU - Alici, A.

AU - Alkin, A.

AU - Alme, J.

AU - Alt, T.

AU - Altenkamper, L.

AU - Altsybeev, I.

AU - Prado, C. Alves Garcia

AU - Andrei, C.

AU - Andreou, D.

AU - Andrews, H. A.

AU - Andronic, A.

AU - Anguelov, V.

AU - Anson, C.

AU - Antičić, T.

AU - Antinori, F.

AU - Antonioli, P.

AU - Anwar, R.

AU - Aphecetche, L.

AU - Appelshäuser, H.

AU - Arcelli, S.

AU - Arnaldi, R.

AU - Arnold, O. W.

AU - Arsene, I. C.

AU - Arslandok, M.

AU - Audurier, B.

AU - Augustinus, A.

AU - Averbeck, R.

AU - Azmi, M. D.

AU - Badalà, A.

AU - Seger, J. E.

N1 - Funding Information: This study was financially supported by the “Kiturami” Faculty Research Assistance Program of Yonsei University College of Medicine ( 6-2012-0148 ), and by the National Research Foundation through a grant funded by the Korean Government (MEST, Basic Research Promotion Fund; NRF-2010-013-E0008 and NRF-2012-000891 ). Publisher Copyright: © 2018, CERN for the benefit of the ALICE collaboration.

PY - 2018/3/1

Y1 - 2018/3/1

N2 - An invariant differential cross section measurement of inclusive π0 and η meson production at mid-rapidity in pp collisions at s=8 TeV was carried out by the ALICE experiment at the LHC. The spectra of π0 and η mesons were measured in transverse momentum ranges of 0.30 and AESSS for the η overestimate the cross sections of both neutral mesons, although such calculations agree with the measured η/ π0 ratio within uncertainties. The results were also compared with PYTHIA 8.2 predictions for which the Monash 2013 tune yields the best agreement with the measured neutral meson spectra. The measurements confirm a universal behavior of the η/ π0 ratio seen for NA27, PHENIX and ALICE data for pp collisions from s=27.5 GeV to s=8 TeV within experimental uncertainties. A relation between the π0 and η production cross sections for pp collisions at s=8 TeV is given by mT scaling for pT>3.5 GeV/c. However, a deviation from this empirical scaling rule is observed for transverse momenta below pT<3.5 GeV/c in the η/ π0 ratio with a significance of 6.2 σ.

AB - An invariant differential cross section measurement of inclusive π0 and η meson production at mid-rapidity in pp collisions at s=8 TeV was carried out by the ALICE experiment at the LHC. The spectra of π0 and η mesons were measured in transverse momentum ranges of 0.30 and AESSS for the η overestimate the cross sections of both neutral mesons, although such calculations agree with the measured η/ π0 ratio within uncertainties. The results were also compared with PYTHIA 8.2 predictions for which the Monash 2013 tune yields the best agreement with the measured neutral meson spectra. The measurements confirm a universal behavior of the η/ π0 ratio seen for NA27, PHENIX and ALICE data for pp collisions from s=27.5 GeV to s=8 TeV within experimental uncertainties. A relation between the π0 and η production cross sections for pp collisions at s=8 TeV is given by mT scaling for pT>3.5 GeV/c. However, a deviation from this empirical scaling rule is observed for transverse momenta below pT<3.5 GeV/c in the η/ π0 ratio with a significance of 6.2 σ.

UR - http://www.scopus.com/inward/record.url?scp=85044517372&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85044517372&partnerID=8YFLogxK

U2 - 10.1140/epjc/s10052-018-5612-8

DO - 10.1140/epjc/s10052-018-5612-8

M3 - Article

AN - SCOPUS:85044517372

VL - 78

JO - Zeitschrift fur Physik C-Particles and Fields

JF - Zeitschrift fur Physik C-Particles and Fields

SN - 1434-6044

IS - 3

M1 - 263

ER -

π⁰ and η meson production in proton-proton collisions at √s=8 TeV

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