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Production of π0and η mesons up to high transverse momentum in pp collisions at 2.76 TeV

  • Author(s): Acharya, S
  • Adamová, D
  • Aggarwal, MM
  • Rinella, GA
  • Agnello, M
  • Agrawal, N
  • Ahammed, Z
  • Ahmad, N
  • Ahn, SU
  • Aiola, S
  • Akindinov, A
  • Alam, SN
  • Albuquerque, DSD
  • Aleksandrov, D
  • Alessandro, B
  • Alexandre, D
  • Molina, RA
  • Alici, A
  • Alkin, A
  • Alme, J
  • Alt, T
  • Altsybeev, I
  • Prado, CAG
  • An, M
  • Andrei, C
  • Andrews, HA
  • Andronic, A
  • Anguelov, V
  • Anson, C
  • Antičić, T
  • Antinori, F
  • Antonioli, P
  • Anwar, R
  • Aphecetche, L
  • Appelshäuser, H
  • Arcelli, S
  • Arnaldi, R
  • Arnold, OW
  • Arsene, IC
  • Arslandok, M
  • Audurier, B
  • Augustinus, A
  • Averbeck, R
  • Awes, T
  • Azmi, MD
  • Badalà, A
  • Baek, YW
  • Bagnasco, S
  • Bailhache, R
  • Bala, R
  • Baldisseri, A
  • Ball, M
  • Baral, RC
  • Barbano, AM
  • Barbera, R
  • Barile, F
  • Barioglio, L
  • Barnaföldi, GG
  • Barnby, LS
  • Barret, V
  • Bartalini, P
  • Barth, K
  • Bartke, J
  • Bartsch, E
  • Basile, M
  • Bastid, N
  • Basu, S
  • Bathen, B
  • Batigne, G
  • Camejo, AB
  • Batyunya, B
  • Batzing, PC
  • Bearden, IG
  • Beck, H
  • Bedda, C
  • Behera, NK
  • Belikov, I
  • Bellini, F
  • Martinez, HB
  • Bellwied, R
  • Beltran, LGE
  • Belyaev, V
  • Bencedi, G
  • Beole, S
  • Bercuci, A
  • Berdnikov, Y
  • Berenyi, D
  • Bertens, RA
  • Berzano, D
  • Betev, L
  • Bhasin, A
  • Bhat, IR
  • Bhati, AK
  • Bhattacharjee, B
  • et al.
Abstract

© 2017, CERN for the benefit of the ALICE collaboration. The invariant differential cross sections for inclusive π0and 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 pTwas 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-pTneutral 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 π0and η meson production.

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