Measurement of D${}_s^{+}$ production and nuclear modification factor in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV

Abstract

The production of prompt D${}_s^{+}$ mesons was measured for the first time in collisions of heavy nuclei with the ALICE detector at the LHC. The analysis was performed on a data sample of Pb-Pb collisions at a centre-of-mass energy per nucleon pair, $\sqrt{s_{\mathrm{NN}}}$, of 2.76 TeV in two different centrality classes, namely 0-10% and 20-50%. D${}_s^{+}$ mesons and their antiparticles were reconstructed at mid-rapidity from their hadronic decay channel D${}_s^{+}\to \varphi {\pi }^{+}$, with $\varphi \to$K${}^{-}$K${}^{+}$, in the transverse momentum intervals $4<p_{\mathrm{T}}<12$ GeV/$c$ and $6<p_{\mathrm{T}}<12$ GeV/$c$ for the 0-10% and 20-50% centrality classes, respectively. The nuclear modification factor $R_{\mathrm{AA}}$ was computed by comparing the $p_{\mathrm{T}}$-differential production yields in Pb-Pb collisions to those in proton-proton (pp) collisions at the same energy. This pp reference was obtained using the cross section measured at $\sqrt{s}=7$ TeV and scaled to $\sqrt{s}=2.76$ TeV. The $R_{\mathrm{AA}}$ of D${}_s^{+}$ mesons was compared to that of non-strange D mesons in the 10% most central Pb-Pb collisions. At high $p_{\mathrm{T}}$ ($8<p_{\mathrm{T}}<12$ GeV/$c$) a suppression of the D${}_s^{+}$-meson yield by a factor of about three, compatible within uncertainties with that of non-strange D mesons, is observed. At lower $p_{\mathrm{T}}$ ($4<p_{\mathrm{T}}<8$ GeV/$c$) the values of the D${}_s^{+}$-meson $R_{\mathrm{AA}}$ are larger than those of non-strange D mesons, although compatible within uncertainties. The production ratios D${}_s^{+}$/D${}^0$ and D${}_s^{+}$\D${}^{+}$ were also measured in Pb-Pb collisions and compared to their values in proton-proton collisions.

27 pages, 6 captioned figures, 4 tables, authors from page 22, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/1883

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