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

The invariant differential cross sections for inclusive π0π0\pi ^{0} and ηη\eta mesons at midrapidity were measured in pp collisions at s√=2.76s=2.76\sqrt{s}=2.76 TeV for transverse momenta 0.4<pT<400.4<pT<400.4<p_{\mathrm {T}}<40 GeV/c and 0.6<pT<200.6<pT<200.6<p_{\...

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Main Authors: Acharya, Shreyasi (Author) , Angelov, Venelin (Author) , Arslandok, Mesut (Author) , Danisch, Meike (Author) , Deisting, Alexander (Author) , Glässel, Peter (Author) , Kim, Jiyoung (Author) , Klewin, Sebastian (Author) , Leardini, Lucia (Author) , Mercado Pérez, Jorge (Author) , Oeschler, Helmut (Author) , Ohlson, Alice (Author) , Pachmayer, Yvonne C. (Author) , Reygers, Klaus (Author) , Schicker, Rainer (Author) , Schmidt, Marten Ole (Author) , Schuchmann, Simone (Author) , Stachel, Johanna (Author) , Weiser, Dennis (Author) , Wilkinson, Jeremy (Author) , Windelband, Bernd (Author) , Zimmermann, Alice (Author)
Corporate Author: ALICE (Author)
Format: Article (Journal)
Language:English
Published: 22 May 2017
In: The European physical journal. C, Particles and fields
Year: 2017, Volume: 77, Issue: 5
ISSN:1434-6052
DOI:10.1140/epjc/s10052-017-4890-x
Online Access:Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1140/epjc/s10052-017-4890-x
Verlag, kostenfrei, Volltext: https://doi.org/10.1140/epjc/s10052-017-4890-x
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Author Notes:ALICE Collaboration*
Description
Summary:The invariant differential cross sections for inclusive π0π0\pi ^{0} and ηη\eta mesons at midrapidity were measured in pp collisions at s√=2.76s=2.76\sqrt{s}=2.76 TeV for transverse momenta 0.4<pT<400.4<pT<400.4<p_{\mathrm {T}}<40 GeV/c and 0.6<pT<200.6<pT<200.6<p_{\mathrm {T}}<20 GeV/c, respectively, using the ALICE detector. This large range in pTpTp_{\mathrm {T}} 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-pTpTp_{\mathrm {T}} neutral pions, which exploits that the showers originating from their decay photons overlap in the EMCal. Above 4 GeV/ccc, 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 π0π0\pi ^{0}, and between 30-50% for the ηη\eta meson, while generator-level simulations with PYTHIA 8.2 describe the data to better than 10-30%, except at pT<1pT<1p_{\mathrm {T}}<1 GeV/ccc. The new data can therefore be used to further improve the theoretical description of π0π0\pi ^{0} and ηη\eta meson production.
Item Description:Im Titel wird das Zeichen "0" hochgestellt
Im Titel werden "pi" und "eta" als griechische Buchstaben dargestellt
The ALICE Collaboration: S. Acharya, V. Anguelov, M. Arslandok, M.C. Danisch, A. Deisting, P. Glässel, J. Kim, S. Klewin, L. Leardini, J. Mercado Pérez, H. Oeschler, A. Ohlson, Y. Pachmayer, K. Reygers, R. Schicker, M.O. Schmidt, S. Schuchmann, J. Stachel, D.F. Weiser, J. Wilkinson, B. Windelband, A. Zimmermann [und weitere]
Gesehen am 02.10.2018
Physical Description:Online Resource
ISSN:1434-6052
DOI:10.1140/epjc/s10052-017-4890-x

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