Journal Article

Production of Formula: see text and Formula: see text mesons up to high transverse momentum in pp collisions at 2.76 TeV

Mitra, J, Murray, S, Ahammed, Z, Corral, G Herrera, Moreno, L A P, Fabbietti, L, Gaardhøje, J J, Bhat, I R, Závada, P, Nair, R, Fuchs, U, Cheynis, B, Caliva, A, Zmeskal, J, Kundu, S, Margutti, J, Camejo, A Batista, Herrmann, F, Westerhoff, U, Buhler, P, Evans, D, Pluta, J, Agrawal, N, Hayashi, S, Scapparone, E, Bercuci, A, Rami, F, Cherney, M, Zaviyalov, N, Passfeld, A, Pestov, Y, Baral, R C, Zaman, A, Rathee, D, Gotovac, S, Wilk, G, Chujo, T, Manso, F, Batyunya, B, Hamagaki, H, Altsybeev, I, Kubera, A M, Zardoshti, N, Mühlheim, D, Poppenborg, H, Tello, A Villatoro, Germain, M, Vigolo, S, Mihaylov, D L, Röhrich, D, Naru, M U, Riggi, F, Berenyi, D, Kalweit, A, Shangaraev, A, Schweda, K, Yoo, I-K, Grelli, A, Hornung, S, Kluge, A, Morales, Y Corrales, Shabanov, A, Cifarelli, L, Trzeciak, B A, Giubellino, P, Jadhav, M B, Mishra, A N, Barnaföldi, G G, Kamin, J, Sandoval, A, Elia, D, Nooren, G, Lee, S, Sultanov, R, Glässel, P, Ng, F, Poljak, N, Gonzalez, V, Jusko, A, Karavichev, O, Melikyan, Y, Suire, C, Anson, C, Ricci, R A, Shahoyan, R, Yin, Z, Lattuca, A, Mohammadi, N, Gladysz-Dziadus, E, Kollegger, T, Kučera, V, Shigaki, K, Kileng, B, Degenhardt, H F, Chang, B, Bedda, C, Hipp

2017

Overview

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/c and [Formula: see text] GeV/c, 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.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/c and [Formula: see text] GeV/c, 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.