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@MISC{Collaboration:355056,
      author       = {{ALICE Collaboration}},
      title        = {{C}harged-particle production as a function of the relative
                      transverse activity classifier in pp, p$-${P}b, and
                      {P}b$-${P}b collisions at the {LHC}},
      reportid     = {GSI-2025-00142},
      year         = {2024},
      note         = {Journal Article GSI record: GSI-2025-00141},
      abstract     = {Measurements of charged-particle production in pp, p-Pb,
                      and Pb-Pb collisions in the toward, away, and transverse
                      regions with the ALICE detector are discussed. These regions
                      are defined event-by-event relative to the azimuthal
                      direction of the charged trigger particle, which is the
                      reconstructed particle with the largest transverse momentum
                      ($p_\mathrm{T}^\mathrm{trig}$) in the range $8 <
                      p_\mathrm{T}^\mathrm{trig} < 15~\mathrm{GeV}/c$. The toward
                      and away regions contain the primary and recoil jets,
                      respectively; both regions are accompanied by the underlying
                      event (UE). In contrast, the transverse region perpendicular
                      to the direction of the trigger particle is dominated by the
                      so-called UE dynamics, and includes also contributions from
                      initial- and final-state radiation. The relative transverse
                      activity classifier,
                      $R_\mathrm{T}=N_\mathrm{ch}^\mathrm{T}/\langle
                      N_\mathrm{ch}^\mathrm{T}\rangle$, is used to group events
                      according to their UE activity, where
                      $N_\mathrm{ch}^\mathrm{T}$ is the charged-particle
                      multiplicity per event in the transverse region and $\langle
                      N_\mathrm{ch}^\mathrm{T}\rangle$ is the mean value over the
                      whole analysed sample. The energy dependence of the
                      $R_\mathrm{T}$ distributions in pp collisions at
                      $\sqrt{s}=2.76, 5.02, 7$, and $13~\mathrm{TeV}$ is reported,
                      exploring the Koba-Nielsen-Olesen (KNO) scaling properties
                      of the multiplicity distributions. The first measurements of
                      charged-particle $p_\mathrm{T}$ spectra as a function of
                      $R_\mathrm{T}$ in the three azimuthal regions in pp, p-Pb,
                      and Pb-Pb collisions at
                      $\sqrt{s_\mathrm{NN}}=5.02~\mathrm{TeV}$ are also reported.
                      Data are compared with predictions obtained from the event
                      generators $\mathrm{PYTHIA}~8$ and
                      $\mathrm{EPOS}~\mathrm{LHC}$. This set of measurements is
                      expected to contribute to the understanding of the origin of
                      collective-like effects in small collision systems (pp and
                      p-Pb).},
      cin          = {ALI / DTL / CIT / EXM / ALICE@CERN},
      cid          = {I:(DE-Ds200)ALI-20080822OR105 /
                      I:(DE-Ds200)DTL-20051214OR031 /
                      I:(DE-Ds200)CIT-20110310OR121 /
                      I:(DE-Ds200)EXM-20080818OR100 / I:(DE-Ds200)Coll-CERN-ALICE},
      pnm          = {612 - Cosmic Matter in the Laboratory (POF4-612) / HGS-HIRe
                      - HGS-HIRe for FAIR (HGS-HIRe) / SUC-GSI-Heidelberg -
                      Strategic university cooperation GSI-U Heidelberg
                      (SUC-GSI-HE) / SUC-GSI-Frankfurt - Strategic university
                      cooperation GSI-U Frankfurt/M (SUC-GSI-FR) /
                      SUC-GSI-Darmstadt - Strategic university cooperation GSI-TU
                      Darmstadt (SUC-GSI-DA) / STRONG-2020 - The strong
                      interaction at the frontier of knowledge: fundamental
                      research and applications (824093)},
      pid          = {G:(DE-HGF)POF4-612 / G:(DE-Ds200)HGS-HIRe /
                      G:(DE-Ds200)SUC-GSI-HE / G:(DE-Ds200)SUC-GSI-FR /
                      G:(DE-Ds200)SUC-GSI-DA / G:(EU-Grant)824093},
      experiment   = {EXP:(DE-H253)LHC-Exp-ALICE-20150101},
      typ          = {PUB:(DE-HGF)32},
      doi          = {10.17182/HEPDATA.146104},
      url          = {https://repository.gsi.de/record/355056},
}