The invariant differential cross sections for inclusive π0π0 and ηη mesons at midrapidity were measured in pp collisions at s√=2.76s=2.76 TeV for transverse momenta 0.4<pT<400.4<pT<40 GeV/c and 0.6<pT<200.6<pT<20 GeV/c, respectively, using the ALICE detector. This large range in pTpT 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- pTpT neutral pions, which exploits that the showers originating from their decay photons overlap in the EMCal. Above 4 GeV/ cc , 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 , and between 30–50% for the ηη meson, while generator-level simulations with PYTHIA 8.2 describe the data to better than 10–30%, except at pT<1pT<1 GeV/ cc . The new data can therefore be used to further improve the theoretical description of π0π0 and ηη meson production.
Production of Pi_0 and eta mesons up to high transverse momentum in pp collisions at 2.76 TeV
BEOLE', Stefania;Bianchi, L.;BOTTA, Elena;CORRALES MORALES, YASSER;FERRETTI, Alessandro;Gagliardi, M.;GALLIO, Mauro;MASERA, Massimo;Puccio, M.;Trogolo, S.;VERCELLIN, Ermanno;
2017-01-01
Abstract
The invariant differential cross sections for inclusive π0π0 and ηη mesons at midrapidity were measured in pp collisions at s√=2.76s=2.76 TeV for transverse momenta 0.4File | Dimensione | Formato | |
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