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

Adam, Jaroslav; Adamova, Dagmar; Aggarwal, Madan Mohan; Aglieri Rinella, Gianluca; Agnello, Michelangelo; Agrawal, Neelima; Ahammed, Zubayer; Ahn, Sang Un; Aiola, Salvatore; Akindinov, Alexander

doi:10.1007/JHEP03(2016)082

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

ALICE

Collaboration

Sep 24, 2015

27 pages

Published in:

JHEP 03 (2016) 082

Published: Mar 14, 2016

e-Print:

1509.07287 [nucl-ex]

DOI:

10.1007/JHEP03(2016)082

Report number:

CERN-PH-EP-2015-253

Experiments:

CERN-LHC-ALICE

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Abstract: (Springer)

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}^{+}

→ ϕπ

^{+}

, with ϕ → K

^{−}

K

^{+}

, in the transverse momentum intervals 4 < p

_{T}

< 12GeV/c and 6 < p

_{T}

< 12 GeV/c for the 0–10% and 20–50% centrality classes, respectively. The nuclear modification factor R

_{AA}

was computed by comparing the p

_{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

_{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

_{T}

(8 < p

_{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

_{T}

(4 < p

_{T}

< 8 GeV/c) the values of the D

_{s}^{+}

-meson R

_{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.

Note:

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

Hadron-Hadron scattering
Heavy ion Experiments
Quark gluon plasma
D/s+: production
D0
D+
D: suppression
antiparticle
cross section
nucleus: heavy

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