Production of π0 and η mesons up to high transverse momentum in pp collisions at 2.76 TeV

ALICE Collaboration

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The invariant differential cross sections for inclusive π0 and η mesons at midrapidity were measured in pp collisions at s=2.76 TeV for transverse momenta 0.4 < pT< 40 GeV/c and 0.6 < pT< 20 GeV/c, respectively, using the ALICE detector. This large range in pT was achieved by combining various analysis techniques and different triggers involving the electromagnetic calorimeter (EMCal). In particular, a new single-cluster, shower-shape based method was developed for the identification of high-pT neutral pions, which exploits that the showers originating from their decay photons overlap in the EMCal. Above 4 GeV/c, the measured cross sections are found to exhibit a similar power-law behavior with an exponent of about 6.3. Next-to-leading-order perturbative QCD calculations differ from the measured cross sections by about 30% for the π0, and between 30–50% for the η meson, while generator-level simulations with PYTHIA 8.2 describe the data to better than 10–30%, except at pT< 1 GeV/c. The new data can therefore be used to further improve the theoretical description of π0 and η meson production.

Original languageEnglish
Article number339
JournalEuropean Physical Journal C
Volume77
Issue number5
DOIs
Publication statusPublished - 2017 May 1

Fingerprint

Calorimeters
transverse momentum
Momentum
mesons
showers
collisions
calorimeters
cross sections
electromagnetism
Photons
Detectors
pions
generators
quantum chromodynamics
actuators
exponents
detectors
photons
decay
simulation

All Science Journal Classification (ASJC) codes

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)

Cite this

@article{13327919a2434b04b9edba8f7ac77dbe,
title = "Production of π0 and η mesons up to high transverse momentum in pp collisions at 2.76 TeV",
abstract = "The invariant differential cross sections for inclusive π0 and η mesons at midrapidity were measured in pp collisions at s=2.76 TeV for transverse momenta 0.4 < pT< 40 GeV/c and 0.6 < pT< 20 GeV/c, respectively, using the ALICE detector. This large range in pT was achieved by combining various analysis techniques and different triggers involving the electromagnetic calorimeter (EMCal). In particular, a new single-cluster, shower-shape based method was developed for the identification of high-pT neutral pions, which exploits that the showers originating from their decay photons overlap in the EMCal. Above 4 GeV/c, the measured cross sections are found to exhibit a similar power-law behavior with an exponent of about 6.3. Next-to-leading-order perturbative QCD calculations differ from the measured cross sections by about 30{\%} for the π0, and between 30–50{\%} for the η meson, while generator-level simulations with PYTHIA 8.2 describe the data to better than 10–30{\%}, except at pT< 1 GeV/c. The new data can therefore be used to further improve the theoretical description of π0 and η meson production.",
author = "{ALICE Collaboration} and S. Acharya and D. Adamov{\'a} and Aggarwal, {M. M.} and Rinella, {G. Aglieri} and M. Agnello and N. Agrawal and Z. Ahammed and N. Ahmad and Ahn, {S. U.} and S. Aiola and A. Akindinov and Alam, {S. N.} and Albuquerque, {D. S.D.} and D. Aleksandrov and B. Alessandro and D. Alexandre and Molina, {R. Alfaro} and A. Alici and A. Alkin and J. Alme and T. Alt and I. Altsybeev and Prado, {C. Alves Garcia} and M. An and C. Andrei and Andrews, {H. A.} and A. Andronic and V. Anguelov and C. Anson and T. Antičić 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 T. Awes and Azmi, {M. D.} and A. Badal{\`a} and Baek, {Y. W.} and S. Bagnasco and R. Bailhache and R. Bala",
year = "2017",
month = "5",
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language = "English",
volume = "77",
journal = "European Physical Journal C",
issn = "1434-6044",
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}

Production of π0 and η mesons up to high transverse momentum in pp collisions at 2.76 TeV. / ALICE Collaboration.

In: European Physical Journal C, Vol. 77, No. 5, 339, 01.05.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Production of π0 and η mesons up to high transverse momentum in pp collisions at 2.76 TeV

AU - ALICE Collaboration

AU - Acharya, S.

AU - Adamová, D.

AU - Aggarwal, M. M.

AU - Rinella, G. Aglieri

AU - Agnello, M.

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahmad, N.

AU - Ahn, S. U.

AU - Aiola, S.

AU - Akindinov, A.

AU - Alam, S. N.

AU - Albuquerque, D. S.D.

AU - Aleksandrov, D.

AU - Alessandro, B.

AU - Alexandre, D.

AU - Molina, R. Alfaro

AU - Alici, A.

AU - Alkin, A.

AU - Alme, J.

AU - Alt, T.

AU - Altsybeev, I.

AU - Prado, C. Alves Garcia

AU - An, M.

AU - Andrei, C.

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 - Awes, T.

AU - Azmi, M. D.

AU - Badalà, A.

AU - Baek, Y. W.

AU - Bagnasco, S.

AU - Bailhache, R.

AU - Bala, R.

PY - 2017/5/1

Y1 - 2017/5/1

N2 - The invariant differential cross sections for inclusive π0 and η mesons at midrapidity were measured in pp collisions at s=2.76 TeV for transverse momenta 0.4 < pT< 40 GeV/c and 0.6 < pT< 20 GeV/c, respectively, using the ALICE detector. This large range in pT was achieved by combining various analysis techniques and different triggers involving the electromagnetic calorimeter (EMCal). In particular, a new single-cluster, shower-shape based method was developed for the identification of high-pT neutral pions, which exploits that the showers originating from their decay photons overlap in the EMCal. Above 4 GeV/c, the measured cross sections are found to exhibit a similar power-law behavior with an exponent of about 6.3. Next-to-leading-order perturbative QCD calculations differ from the measured cross sections by about 30% for the π0, and between 30–50% for the η meson, while generator-level simulations with PYTHIA 8.2 describe the data to better than 10–30%, except at pT< 1 GeV/c. The new data can therefore be used to further improve the theoretical description of π0 and η meson production.

AB - The invariant differential cross sections for inclusive π0 and η mesons at midrapidity were measured in pp collisions at s=2.76 TeV for transverse momenta 0.4 < pT< 40 GeV/c and 0.6 < pT< 20 GeV/c, respectively, using the ALICE detector. This large range in pT was achieved by combining various analysis techniques and different triggers involving the electromagnetic calorimeter (EMCal). In particular, a new single-cluster, shower-shape based method was developed for the identification of high-pT neutral pions, which exploits that the showers originating from their decay photons overlap in the EMCal. Above 4 GeV/c, the measured cross sections are found to exhibit a similar power-law behavior with an exponent of about 6.3. Next-to-leading-order perturbative QCD calculations differ from the measured cross sections by about 30% for the π0, and between 30–50% for the η meson, while generator-level simulations with PYTHIA 8.2 describe the data to better than 10–30%, except at pT< 1 GeV/c. The new data can therefore be used to further improve the theoretical description of π0 and η meson production.

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U2 - 10.1140/epjc/s10052-017-4890-x

DO - 10.1140/epjc/s10052-017-4890-x

M3 - Article

AN - SCOPUS:85019990935

VL - 77

JO - European Physical Journal C

JF - European Physical Journal C

SN - 1434-6044

IS - 5

M1 - 339

ER -