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Charged-particle production as a function of multiplicity and transverse spherocity in pp collisions at √s=5.02 and 13 TeV

  • Author(s): Acharya, S;
  • Adamová, D;
  • Adhya, SP;
  • Adler, A;
  • Adolfsson, J;
  • Aggarwal, MM;
  • Rinella, GA;
  • Agnello, M;
  • Agrawal, N;
  • Ahammed, Z;
  • Ahmad, S;
  • Ahn, SU;
  • Aiola, S;
  • Akindinov, A;
  • Al-Turany, M;
  • Alam, SN;
  • Albuquerque, DSD;
  • Aleksandrov, D;
  • Alessandro, B;
  • Alfanda, HM;
  • Molina, RA;
  • Ali, B;
  • Ali, Y;
  • Alici, A;
  • Alkin, A;
  • Alme, J;
  • Alt, T;
  • Altenkamper, L;
  • Altsybeev, I;
  • Anaam, MN;
  • Andrei, C;
  • Andreou, D;
  • Andrews, HA;
  • Andronic, A;
  • Angeletti, M;
  • Anguelov, V;
  • Anson, C;
  • Antičić, T;
  • Antinori, F;
  • Antonioli, P;
  • Anwar, R;
  • Apadula, N;
  • Aphecetche, L;
  • Appelshäuser, H;
  • Arcelli, S;
  • Arnaldi, R;
  • Arratia, M;
  • Arsene, IC;
  • Arslandok, M;
  • Augustinus, A;
  • Averbeck, R;
  • Aziz, S;
  • Azmi, MD;
  • Badalà, A;
  • Baek, YW;
  • Bagnasco, S;
  • Bai, X;
  • Bailhache, R;
  • Bala, R;
  • Baldisseri, A;
  • Ball, M;
  • Baral, RC;
  • Barbera, R;
  • Barioglio, L;
  • Barnaföldi, GG;
  • Barnby, LS;
  • Barret, V;
  • Bartalini, P;
  • Barth, K;
  • Bartsch, E;
  • Baruffaldi, F;
  • Bastid, N;
  • Basu, S;
  • Batigne, G;
  • Batyunya, B;
  • Batzing, PC;
  • Bauri, D;
  • Alba, JLB;
  • Bearden, IG;
  • Bedda, C;
  • Behera, NK;
  • Belikov, I;
  • Bellini, F;
  • Bellwied, R;
  • Belyaev, V;
  • Bencedi, G;
  • Beole, S;
  • Bercuci, A;
  • Berdnikov, Y;
  • Berenyi, D;
  • Bertens, RA;
  • Berzano, D;
  • Besoiu, MG;
  • Betev, L;
  • Bhasin, A;
  • Bhat, IR;
  • Bhatt, H;
  • Bhattacharjee, B;
  • Bianchi, A;
  • Bianchi, L
  • et al.
Abstract

We present a study of the inclusive charged-particle transverse momentum (pT) spectra as a function of charged-particle multiplicity density at mid-pseudorapidity, d Nch/ d η, in pp collisions at s=5.02 and 13 TeV covering the kinematic range | η| < 0.8 and 0.15 < pT< 20 GeV/c. The results are presented for events with at least one charged particle in | η| < 1 (INEL>0). The pT spectra are reported for two multiplicity estimators covering different pseudorapidity regions. The pT spectra normalized to that for INEL>0 show little energy dependence. Moreover, the high-pT yields of charged particles increase faster than the charged-particle multiplicity density. The average pT as a function of multiplicity and transverse spherocity is reported for pp collisions at s=13 TeV. For low- (high-) spherocity events, corresponding to jet-like (isotropic) events, the average pT is higher (smaller) than that measured in INEL>0 pp collisions. Within uncertainties, the functional form of ⟨ pT⟩ (Nch) is not affected by the spherocity selection. While EPOS LHC gives a good description of many features of data, PYTHIA overestimates the average pT in jet-like events.

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