Neutral pion and eta meson production in p-Pb collisions at root S-NN=5.02 TeV

S. Acharya; D. Adamova; J Adolfsson; MM. Aggarwal; G.A. Rinella; Maria Agnello; N. Agrawal; Z. Ahammed; S.U. Ahn; S. Aiola; A. Akindinov; M. Al-Turany; SN Alam; DSD Albuquerque; D. Aleksandrov; B Alessandro; R. Alfaro-Molina; Yusuf Ali; A. Alici; A. Alkin; J. Alme; T. Alt; Ian Bearden; Marek Chojnacki; rtc312 rtc312; Freja Thoresen; Christian Alexander Bourjau; Ante Bilandzic; Jens Jørgen Gaardhøje; Katarina Gajdosova; Ozelin De Lima Pimentel Lais; Børge Svane Nielsen; bsm989 bsm989; You Zhou; Vojtech Pacik

doi:10.1140/epjc/s10052-018-6013-8

Neutral pion and eta meson production in p-Pb collisions at root S-NN=5.02 TeV

S. Acharya, D. Adamova, J Adolfsson, MM. Aggarwal, G.A. Rinella, Maria Agnello, N. Agrawal, Z. Ahammed, S.U. Ahn, S. Aiola, A. Akindinov, M. Al-Turany, SN Alam, DSD Albuquerque, D. Aleksandrov, B Alessandro, R. Alfaro-Molina, Yusuf Ali, A. Alici, A. AlkinJ. Alme, T. Alt, Ian Bearden, Marek Chojnacki, rtc312 rtc312, Freja Thoresen, Christian Alexander Bourjau, Ante Bilandzic, Jens Jørgen Gaardhøje, Katarina Gajdosova, Ozelin De Lima Pimentel Lais, Børge Svane Nielsen, bsm989 bsm989, You Zhou, Vojtech Pacik

Experimental Particle Physics

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Abstract

Neutral pion and η meson invariant differential yields were measured in non-single diffractive p–Pb collisions at sNN = 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 π⁰ and η meson inclusive production are measured near mid-rapidity in a broad transverse momentum range of 0.3<pT<20GeV/c and 0.7<pT<20GeV/c, respectively. The measured η/ π⁰ ratio increases with p_T and saturates for p_T > 4 GeV / c at 0.483 ± 0. 015 _stat± 0. 015 _sys. A deviation from m_T scaling is observed for p_T< 2 GeV / c. The measured η/ π⁰ ratio is consistent with previous measurements from proton-nucleus and pp collisions over the full p_T range. The measured η/ π⁰ ratio at high p_T also agrees within uncertainties with measurements from nucleus–nucleus collisions. The π⁰ and η yields in p–Pb relative to the scaled pp interpolated reference, R_pPb, are presented for 0.3 < p_T< 20 GeV / c and 0.7 < p_T< 20 GeV / c, respectively. The results are compared with theoretical model calculations. The values of R_pPb are consistent with unity for transverse momenta above 2 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.

Original language	English
Article number	624
Journal	European Physical Journal C
Volume	78
Issue number	8
Number of pages	25
ISSN	1434-6044
DOIs	https://doi.org/10.1140/epjc/s10052-018-6013-8
Publication status	Published - 1 Aug 2018

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Acharya, S., Adamova, D., Adolfsson, J., Aggarwal, MM., Rinella, G. A., Agnello, M., Agrawal, N., Ahammed, Z., Ahn, S. U., Aiola, S., Akindinov, A., Al-Turany, M., Alam, SN., Albuquerque, DSD., Aleksandrov, D., Alessandro, B., Alfaro-Molina, R., Ali, Y., Alici, A., ... Pacik, V. (2018). Neutral pion and eta meson production in p-Pb collisions at root S-NN=5.02 TeV. European Physical Journal C, 78(8), Article 624. https://doi.org/10.1140/epjc/s10052-018-6013-8

Acharya, S, Adamova, D, Adolfsson, J, Aggarwal, MM, Rinella, GA, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, SU, Aiola, S, Akindinov, A, Al-Turany, M, Alam, SN, Albuquerque, DSD, Aleksandrov, D, Alessandro, B, Alfaro-Molina, R, Ali, Y, Alici, A, Alkin, A, Alme, J, Alt, T, Bearden, I, Chojnacki, M, rtc312, R, Thoresen, F, Bourjau, CA, Bilandzic, A, Gaardhøje, JJ, Gajdosova, K, Lais, ODLP, Nielsen, BS , bsm989, B , Zhou, Y & Pacik, V 2018, 'Neutral pion and eta meson production in p-Pb collisions at root S-NN=5.02 TeV', European Physical Journal C, vol. 78, no. 8, 624. https://doi.org/10.1140/epjc/s10052-018-6013-8

@article{db67078e29c048ff8a1e760faf021afa,

title = "Neutral pion and eta meson production in p-Pb collisions at root S-NN=5.02 TeV",

abstract = "Neutral pion and η meson invariant differential yields were measured in non-single diffractive p–Pb collisions at sNN = 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 π0 and η meson inclusive production are measured near mid-rapidity in a broad transverse momentum range of 0.30 ratio increases with pT and saturates for pT > 4 GeV / c at 0.483 ± 0. 015 stat± 0. 015 sys. A deviation from mT scaling is observed for pT< 2 GeV / c. The measured η/ π0 ratio is consistent with previous measurements from proton-nucleus and pp collisions over the full pT range. The measured η/ π0 ratio at high pT also agrees within uncertainties with measurements from nucleus–nucleus collisions. The π0 and η yields in p–Pb relative to the scaled pp interpolated reference, RpPb, are presented for 0.3 < pT< 20 GeV / c and 0.7 < pT< 20 GeV / c, respectively. The results are compared with theoretical model calculations. The values of RpPb are consistent with unity for transverse momenta above 2 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.",

author = "S. Acharya and D. Adamova and J Adolfsson and MM. Aggarwal and G.A. Rinella and Maria Agnello and N. Agrawal and Z. Ahammed and S.U. Ahn and S. Aiola and A. Akindinov and M. Al-Turany and SN Alam and DSD Albuquerque and D. Aleksandrov and B Alessandro and R. Alfaro-Molina and Yusuf Ali and A. Alici and A. Alkin and J. Alme and T. Alt and Ian Bearden and Marek Chojnacki and rtc312 rtc312 and Freja Thoresen and Bourjau, {Christian Alexander} and Ante Bilandzic and Gaardh{\o}je, {Jens J{\o}rgen} and Katarina Gajdosova and Lais, {Ozelin De Lima Pimentel} and Nielsen, {B{\o}rge Svane} and bsm989 bsm989 and You Zhou and Vojtech Pacik",

year = "2018",

month = aug,

day = "1",

doi = "10.1140/epjc/s10052-018-6013-8",

language = "English",

volume = "78",

journal = "European Physical Journal C",

issn = "1434-6044",

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number = "8",

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TY - JOUR

T1 - Neutral pion and eta meson production in p-Pb collisions at root S-NN=5.02 TeV

AU - Acharya, S.

AU - Adamova, D.

AU - Adolfsson, J

AU - Aggarwal, MM.

AU - Rinella, G.A.

AU - Agnello, Maria

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahn, S.U.

AU - Aiola, S.

AU - Akindinov, A.

AU - Al-Turany, M.

AU - Alam, SN

AU - Albuquerque, DSD

AU - Aleksandrov, D.

AU - Alessandro, B

AU - Alfaro-Molina, R.

AU - Ali, Yusuf

AU - Alici, A.

AU - Alkin, A.

AU - Alme, J.

AU - Alt, T.

AU - Bearden, Ian

AU - Chojnacki, Marek

AU - rtc312, rtc312

AU - Thoresen, Freja

AU - Bourjau, Christian Alexander

AU - Bilandzic, Ante

AU - Gaardhøje, Jens Jørgen

AU - Gajdosova, Katarina

AU - Lais, Ozelin De Lima Pimentel

AU - Nielsen, Børge Svane

AU - bsm989, bsm989

AU - Zhou, You

AU - Pacik, Vojtech

PY - 2018/8/1

Y1 - 2018/8/1

N2 - Neutral pion and η meson invariant differential yields were measured in non-single diffractive p–Pb collisions at sNN = 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 π0 and η meson inclusive production are measured near mid-rapidity in a broad transverse momentum range of 0.30 ratio increases with pT and saturates for pT > 4 GeV / c at 0.483 ± 0. 015 stat± 0. 015 sys. A deviation from mT scaling is observed for pT< 2 GeV / c. The measured η/ π0 ratio is consistent with previous measurements from proton-nucleus and pp collisions over the full pT range. The measured η/ π0 ratio at high pT also agrees within uncertainties with measurements from nucleus–nucleus collisions. The π0 and η yields in p–Pb relative to the scaled pp interpolated reference, RpPb, are presented for 0.3 < pT< 20 GeV / c and 0.7 < pT< 20 GeV / c, respectively. The results are compared with theoretical model calculations. The values of RpPb are consistent with unity for transverse momenta above 2 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.

AB - Neutral pion and η meson invariant differential yields were measured in non-single diffractive p–Pb collisions at sNN = 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 π0 and η meson inclusive production are measured near mid-rapidity in a broad transverse momentum range of 0.30 ratio increases with pT and saturates for pT > 4 GeV / c at 0.483 ± 0. 015 stat± 0. 015 sys. A deviation from mT scaling is observed for pT< 2 GeV / c. The measured η/ π0 ratio is consistent with previous measurements from proton-nucleus and pp collisions over the full pT range. The measured η/ π0 ratio at high pT also agrees within uncertainties with measurements from nucleus–nucleus collisions. The π0 and η yields in p–Pb relative to the scaled pp interpolated reference, RpPb, are presented for 0.3 < pT< 20 GeV / c and 0.7 < pT< 20 GeV / c, respectively. The results are compared with theoretical model calculations. The values of RpPb are consistent with unity for transverse momenta above 2 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.

U2 - 10.1140/epjc/s10052-018-6013-8

DO - 10.1140/epjc/s10052-018-6013-8

M3 - Journal article

SN - 1434-6044

VL - 78

JO - European Physical Journal C

JF - European Physical Journal C

IS - 8

M1 - 624

ER -

Neutral pion and eta meson production in p-Pb collisions at root S-NN=5.02 TeV

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