Nuclear modification factor of light neutral-meson spectra up to high transverse momentum in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV

Abstract

Neutral pion (${\pi }^0$) and $\eta$ meson production cross sections were measured up to unprecedentedly high transverse momenta ($p_{\mathrm{T}}$) in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV. The mesons were reconstructed via their two-photon decay channel in the rapidity interval $-1.3<y<0.3$ in the ranges of $0.4<p_{\mathrm{T}}<200$ GeV/$c$ and $1.0<p_{\mathrm{T}}<50$ GeV/$c$, respectively. The respective nuclear modification factor ($R_{\mathrm{pPb}}$) is presented for $p_{\mathrm{T}}$ up to of 200 and 30 GeV/$c$, where the former was achieved by extending the ${\pi }^0$ measurement in pp collisions at $\sqrt{s}$ = 8 TeV using the merged cluster technique. The values of $R_{\mathrm{pPb}}$ are below unity for $p_{\mathrm{T}}<10$ GeV/$c$, while they are consistent with unity for $p_{\mathrm{T}}>10$ GeV/$c$, leaving essentially no room for final state energy loss. The new data provide strong 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 $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV.

19 pages, 4 captioned figures, 2 tables, authors from page 14, published version, figures at this http://alice-publications.web.cern.ch/node/7044

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