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

Acharya, S; Adamova, D.; Aggarwal, M.M; Aglieri Rinella, G; Agnello, M.; Agrawal, N; Christiansen, Peter LU ; Ljunggren, Martin LU ; Oskarsson, Anders LU and Richert, Tuva LU , et al. (2017) In European Physical Journal C 77(5).
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.... (More)
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. © 2017, CERN for the benefit of the ALICE collaboration. (Less)
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European Physical Journal C
volume
77
issue
5
publisher
Springer
external identifiers
  • scopus:85019990935
ISSN
1434-6044
DOI
10.1140/epjc/s10052-017-4890-x
language
English
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yes
id
84db179e-3cb0-4d2a-8150-eea29f1c8bf2
date added to LUP
2017-07-03 13:23:33
date last changed
2017-07-09 05:03:00
@article{84db179e-3cb0-4d2a-8150-eea29f1c8bf2,
  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 &lt; pT&lt; 40 GeV/c and 0.6 &lt; pT&lt; 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&lt; 1 GeV/c. The new data can therefore be used to further improve the theoretical description of π0 and η meson production. © 2017, CERN for the benefit of the ALICE collaboration.},
  articleno    = {339},
  author       = {Acharya, S and Adamova, D. and Aggarwal, M.M and Aglieri Rinella, G and Agnello, M. and Agrawal, N and Christiansen, Peter and Ljunggren, Martin and Oskarsson, Anders and Richert, Tuva and Silvermyr, David and Stenlund, Evert and Vislavicius, Vytautas and , },
  issn         = {1434-6044},
  language     = {eng},
  number       = {5},
  publisher    = {Springer},
  series       = {European Physical Journal C},
  title        = {Production of π0 and η mesons up to high transverse momentum in pp collisions at 2.76 TeV},
  url          = {http://dx.doi.org/10.1140/epjc/s10052-017-4890-x},
  volume       = {77},
  year         = {2017},
}