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

ALICE Collaboration

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

ALICE Collaboration

Research output: Contribution to journal › Article › peer-review

Abstract

An invariant differential cross section measurement of inclusive π ⁰ and η meson production at midrapidity in pp collisions at √s = 8 TeV was carried out by the ALICE experiment at the LHC. The spectra of π ⁰ and η mesons were measured in transverse momentum ranges of 0.3 < p_T < 35 GeV/c and 0.5 < p_T < 35 GeV/c, respectively. Next-to-leading order perturbative QCD calculations using fragmentation functions DSS14 for the π ⁰ and AESSS for the η overestimate the cross sections of both neutral mesons, although such calculations agree with the measured η /π ⁰ 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 /π ⁰ 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 π ⁰ and η production cross sections for pp collisions at √s = 8 TeV is given by m_T scaling for p_T > 3.5 GeV/c. However, a deviation from this empirical scaling rule is observed for transverse momenta below p_T < 3.5 GeV/c in the η /π ⁰ ratio with a significance of 6.2σ .

Original language	English (US)
Journal	Unknown Journal
State	Published - Aug 29 2017
Externally published	Yes

All Science Journal Classification (ASJC) codes

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@article{e71b31010573456f83aff576feb0c463,

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

abstract = "An invariant differential cross section measurement of inclusive π 0 and η meson production at midrapidity in pp collisions at √s = 8 TeV was carried out by the ALICE experiment at the LHC. The spectra of π 0 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 π 0 and AESSS for the η overestimate the cross sections of both neutral mesons, although such calculations agree with the measured η /π 0 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 /π 0 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 π 0 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 /π 0 ratio with a significance of 6.2σ .",

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 {Alves Garcia Prado}, C. 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.}",

year = "2017",

month = aug,

day = "29",

language = "English (US)",

journal = "Nuclear Physics A",

issn = "0375-9474",

publisher = "Elsevier",

}

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 - Alves Garcia Prado, C.

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.

PY - 2017/8/29

Y1 - 2017/8/29

N2 - An invariant differential cross section measurement of inclusive π 0 and η meson production at midrapidity in pp collisions at √s = 8 TeV was carried out by the ALICE experiment at the LHC. The spectra of π 0 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 π 0 and AESSS for the η overestimate the cross sections of both neutral mesons, although such calculations agree with the measured η /π 0 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 /π 0 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 π 0 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 /π 0 ratio with a significance of 6.2σ .

AB - An invariant differential cross section measurement of inclusive π 0 and η meson production at midrapidity in pp collisions at √s = 8 TeV was carried out by the ALICE experiment at the LHC. The spectra of π 0 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 π 0 and AESSS for the η overestimate the cross sections of both neutral mesons, although such calculations agree with the measured η /π 0 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 /π 0 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 π 0 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 /π 0 ratio with a significance of 6.2σ .

UR - http://www.scopus.com/inward/record.url?scp=85095093141&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85095093141&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:85095093141

JO - Nuclear Physics A

JF - Nuclear Physics A

SN - 0375-9474

ER -