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Open Access Publications from the University of California

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

  • Author(s): Acharya, S;
  • Adamová, D;
  • Aggarwal, MM;
  • Rinella, G Aglieri;
  • 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, R Alfaro;
  • Alici, A;
  • Alkin, A;
  • Alme, J;
  • Alt, T;
  • Altsybeev, I;
  • Prado, C Alves Garcia;
  • 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, A Batista;
  • Batyunya, B;
  • Batzing, PC;
  • Bearden, IG;
  • Beck, H;
  • Bedda, C;
  • Behera, NK;
  • Belikov, I;
  • Bellini, F;
  • Martinez, H Bello;
  • 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;
  • Bhom, J;
  • Bianchi, L;
  • Bianchi, N;
  • Bianchin, C;
  • Bielčík, J;
  • Bielčíková, J;
  • Bilandzic, A;
  • Biro, G;
  • Biswas, R;
  • Biswas, S;
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  • Blau, D;
  • Blume, C;
  • Boca, G;
  • Bock, F;
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  • Bombara, M;
  • Bonomi, G;
  • Bonora, M;
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  • Borel, H;
  • Borissov, A;
  • Borri, M;
  • Botta, E;
  • Bourjau, C;
  • Braun-Munzinger, P;
  • Bregant, M;
  • Broker, TA;
  • Browning, TA;
  • Broz, M;
  • Brucken, EJ;
  • Bruna, E;
  • Bruno, GE;
  • Budnikov, D;
  • Buesching, H;
  • Bufalino, S;
  • Buhler, P;
  • Buitron, SAI;
  • Buncic, P;
  • Busch, O;
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  • Butt, JB;
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  • Carena, W;
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  • Sanchez, C Ceballos;
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  • Valle, Z Conesa Del;
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  • Maldonado, I Cortés;
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  • ALICE Collaboration
  • et al.
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/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.

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