Production of π0 and η mesons up to high transverse momentum in pp collisions at 2.76 TeV
ALICE Collaboration. (2017). Production of π0 and η mesons up to high transverse momentum in pp collisions at 2.76 TeV. European Physical Journal C, 77 (5), 339. doi:10.1140/epjc/s10052-017-4890-x
Published inEuropean Physical Journal C
Rak, Jan |
© CERN for the benefit of the CMS collaboration 2017. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License. Funded by SCOAP3.
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 highpT 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. ...
PublisherSpringer Berlin Heidelberg
NB.An erratum to this article is available at https://doi.org/10.1140/epjc/s10052-017-5144-7