Production of <i>π</i><SUP>0</SUP> and <i>η</i> mesons up to high transverse momentum in pp collisions at 2.76 TeV



Acharya, S, Adamova, D, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, N, Ahn, SU, Aiola, S
et al (show 1019 more authors) (2017) Production of <i>π</i><SUP>0</SUP> and <i>η</i> mesons up to high transverse momentum in pp collisions at 2.76 TeV. EUROPEAN PHYSICAL JOURNAL C, 77 (5). 339-.

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Abstract

The invariant differential cross sections for inclusive [Formula: see text] and [Formula: see text] mesons at midrapidity were measured in pp collisions at [Formula: see text] TeV for transverse momenta [Formula: see text] GeV/<i>c</i> and [Formula: see text] GeV/<i>c</i>, respectively, using the ALICE detector. This large range in [Formula: see text] 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-[Formula: see text] neutral pions, which exploits that the showers originating from their decay photons overlap in the EMCal. Above 4 GeV/[Formula: see text], 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 [Formula: see text], and between 30-50% for the [Formula: see text] meson, while generator-level simulations with PYTHIA 8.2 describe the data to better than 10-30%, except at [Formula: see text] GeV/[Formula: see text]. The new data can therefore be used to further improve the theoretical description of [Formula: see text] and [Formula: see text] meson production.

Item Type: Article
Uncontrolled Keywords: ALICE Collaboration
Depositing User: Symplectic Admin
Date Deposited: 21 Jun 2017 13:02
Last Modified: 15 Oct 2023 06:50
DOI: 10.1140/epjc/s10052-017-4890-x
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3008085