Multiplicity analysis and Multiplicity analysis and dN/d dN/d reconstruction reconstruction with the with the silicon pixel detector silicon pixel detector Terzo Convegno Nazionale sulla Fisica di ALICE Terzo Convegno Nazionale sulla Fisica di ALICE Frascati (Italy) – November 12-14, 2007 Frascati (Italy) – November 12-14, 2007 Maria Nicassio Maria Nicassio (Univ. and INFN Bari) (Univ. and INFN Bari) in collaboration with in collaboration with D. Elia, B. Ghidini (Univ. and INFN Bari) D. Elia, B. Ghidini (Univ. and INFN Bari) T. Virgili (Univ. Salerno) T. Virgili (Univ. Salerno)
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Multiplicity analysis and dN/d h reconstruction with the silicon pixel detector
Terzo Convegno Nazionale sulla Fisica di ALICE Frascati (Italy) – November 12-14, 2007. Multiplicity analysis and dN/d h reconstruction with the silicon pixel detector. Maria Nicassio (Univ. and INFN Bari) in collaboration with D. Elia, B. Ghidini (Univ. and INFN Bari) - PowerPoint PPT Presentation
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Multiplicity analysis Multiplicity analysis and and
dN/ddN/dreconstructionreconstructionwith the with the
silicon pixel detectorsilicon pixel detector
Terzo Convegno Nazionale sulla Fisica di ALICETerzo Convegno Nazionale sulla Fisica di ALICEFrascati (Italy) – November 12-14, 2007Frascati (Italy) – November 12-14, 2007
Maria Nicassio Maria Nicassio (Univ. and INFN Bari)(Univ. and INFN Bari)
in collaboration within collaboration with
D. Elia, B. Ghidini (Univ. and INFN Bari)D. Elia, B. Ghidini (Univ. and INFN Bari)T. Virgili (Univ. Salerno)T. Virgili (Univ. Salerno)
Maria Nicassio Convegno Nazionale sulla Fisica di ALICE Frascati - November 12, 2007
Maria Nicassio Convegno Nazionale sulla Fisica di ALICE Frascati - November 12, 2007
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IntroductionIntroduction
Why multiplicity: first measurement in p-p collisions for ALICE global observable characterizing the event comparison with results obtained at lower energies
Why multiplicity with pixels: available in a short time advantages over reconstructed tracks (ITS+TPC)
larger acceptance coverage only alignment of the two pixel layers required
Maria Nicassio Convegno Nazionale sulla Fisica di ALICE Frascati - November 12, 2007
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IntroductionIntroduction
Acceptance coverage:
SPD layers:-2.0 < < 2.0 (inner)
-1.5 < < 1.5 (outer)
Maria Nicassio Convegno Nazionale sulla Fisica di ALICE Frascati - November 12, 2007
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Multiplicity reconstruction: (a) counting clusters on the inner layer (|| < 2.0)