Nuclear modification factor of light neutral-meson spectra up to high transverse momentum in p–Pb collisions at sNN=8.16 TeV

The ALICE collaboration
Phys.Lett.B 827 (2022) 136943, 2022.

Abstract (data abstract)
CERN-LHC. Neutral pion and ETA meson production cross sections were measured up to unprecedentedly high transverse momenta ($p_\mbox{T}$) in p-Pb collisions at $\sqrt{s_\mbox{NN}}=8.16$ TeV. The mesons were reconstructed via their two-photon decay channel in the rapidity interval $-1.3<y_\mbox{cms}<0.3$ in the ranges of $0.4<p_\mbox{T}<200$ GeV/$c$ and $1.0<p_\mbox{T}<50$ GeV/$c$, respectively. The respective nuclear modification factor ($R_\mbox{pPb}$) is presented for $p_\mbox{T}$ up to of 200 and 30 GeV/$c$, where the former was achieved extending the PI0 measurement in pp collisions at $\sqrt{s}=8$ TeV. The values of $R_\mbox{pPb}$ are below unity for $p_\mbox{T}<10$ GeV/$c$, while they are consistent with unity for $p_\mbox{T}>10$ GeV/$c$, leaving essentially no room for final state energy loss. The new data provide constraints for nuclear parton distribution and fragmentation functions over a broad kinematic range and are compared to model predictions as well as previous results at $\sqrt{s_\mbox{NN}}=5.02$ TeV.

  • Table 1

    Data from Fig. 3 a)

    10.17182/hepdata.128138.v1/t1

    Invariant differential cross section of PI0 produced in inelastic p-Pb collisions at a centre-of-mass energy per nucleon of 8.16 TeV,...

  • Table 2

    Data from Fig. 3 a)

    10.17182/hepdata.128138.v1/t2

    Invariant differential cross section of PI0 produced in inelastic pp collisions at a centre-of-mass energy of 8 TeV, the uncertainty...

  • Table 3

    Data from Fig. 3 b)

    10.17182/hepdata.128138.v1/t3

    Invariant differential cross section of ETA produced in inelastic p-Pb collisions at a centre-of-mass energy per nucleon of 8.16 TeV,...

  • Table 4

    Data from Fig. 3 b)

    10.17182/hepdata.128138.v1/t4

    Invariant differential cross section of ETA produced in inelastic pp collisions at a centre-of-mass energy of 8 TeV, the uncertainty...

  • Table 5

    Data from Fig.3 f)

    10.17182/hepdata.128138.v1/t5

    The measured ratio of cross sections for inclusive ETA to PI0 production in inelastic p-Pb collisions at a centre-of-mass energy...

  • Table 6

    Data from Fig.3 f)

    10.17182/hepdata.128138.v1/t6

    The measured ratio of cross sections for inclusive ETA to PI0 production in inelastic pp collisions at a centre-of-mass energy...

  • Table 7

    Data from Fig.4 a)

    10.17182/hepdata.128138.v1/t7

    The nuclear modification factor RPPB of PI0 as a function of pT in inelastic p-Pb collisions at a centre-of-mass energy...

  • Table 8

    Data from Fig.4 a)

    10.17182/hepdata.128138.v1/t8

    The nuclear modification factor RPPB of ETA as a function of pT in inelastic p-Pb collisions at a centre-of-mass energy...

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