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, √sNN, 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 < pT < 12 GeV/c and 6 < pT < 12GeV/c for the 0–10% and 20–50% centrality classes, respectively. The nuclear modification factor RAA was computed by comparing the pT-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 √s = 2.76 TeV. The RAA of D+s mesons was compared to that of non-strange D mesons in the 10% most central Pb-Pb collisions. At high pT (8 < pT < 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 pT (4 < pT < 8 GeV/c ) the values of the D+s -meson RAA are larger than those of non-strange D mesons, although compatible within uncertainties. The production ratios D+s /D0 and D+s /D+ were also measured in Pb-Pb collisions and compared to their values in proton-proton collisions.

Measurement of D s + production and nuclear modification factor in Pb-Pb collisions at s N N = 2.76 $$ \sqrt\mathrms_\mathrmNN=2.76 $$ TeV

BEOLE', Stefania;Bianchi, L.;BOTTA, Elena;FERRETTI, Alessandro;GAGLIARDI, Martino;GALLIO, Mauro;MASERA, Massimo;PUCCIO, MAXIMILIANO;Trogolo, S.;VERCELLIN, Ermanno;
2016-01-01

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, √sNN, 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 < pT < 12 GeV/c and 6 < pT < 12GeV/c for the 0–10% and 20–50% centrality classes, respectively. The nuclear modification factor RAA was computed by comparing the pT-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 √s = 2.76 TeV. The RAA of D+s mesons was compared to that of non-strange D mesons in the 10% most central Pb-Pb collisions. At high pT (8 < pT < 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 pT (4 < pT < 8 GeV/c ) the values of the D+s -meson RAA are larger than those of non-strange D mesons, although compatible within uncertainties. The production ratios D+s /D0 and D+s /D+ were also measured in Pb-Pb collisions and compared to their values in proton-proton collisions.
2016
2016
3
082
082
Hadron-Hadron scattering, Heavy ion Experiments, Quark gluon plasma
Adam, J.; Adamová, D.; Aggarwal, M. M.; Aglieri Rinella, G.; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahn, S. U.; Aiola, S.; Akindinov, A.; Alam, S. N.;...espandi
File in questo prodotto:
File Dimensione Formato  
JHEP_03_2016_082.pdf

Accesso aperto

Descrizione: articolo principale
Tipo di file: PDF EDITORIALE
Dimensione 1.08 MB
Formato Adobe PDF
1.08 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1559399
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 14
  • ???jsp.display-item.citation.isi??? 20
social impact