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First proton-proton collisions at the LHC as observed with the ALICE detector: measurement of the charged-particle pseudorapidity density at √s=900 GeV

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On 23rd November 2009, during the early commissioning of the CERN Large Hadron Collider (LHC), two counter-rotating proton bunches were circulated for the first time concurrently in the machine, at the LHC injection energy of 450 GeV per beam. Although the proton intensity was very low, with only on...

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Hauptverfasser: Aamodt, Kenneth (VerfasserIn) , Angelov, Venelin (VerfasserIn) , Busch, Oliver (VerfasserIn) , Glässel, Peter (VerfasserIn) , Grajcarek, Robert (VerfasserIn) , Herrmann, Norbert (VerfasserIn) , Klein, Jochen (VerfasserIn) , Mercado Pérez, Jorge (VerfasserIn) , Oyama, Ken (VerfasserIn) , Pachmayer, Yvonne C. (VerfasserIn) , Schicker, Rainer (VerfasserIn) , Schweda, Kai (VerfasserIn) , Soltveit, Hans Kristian (VerfasserIn) , Stachel, Johanna (VerfasserIn) , Vallero, Sara (VerfasserIn) , Windelband, Bernd (VerfasserIn)
Körperschaft: ALICE (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 2010
In: The European physical journal. C, Particles and fields
Year: 2009, Jahrgang: 65, Pages: 1-15
ISSN:1434-6052
DOI:10.1140/epjc/s10052-009-1227-4
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1140/epjc/s10052-009-1227-4
Volltext
Verfasserangaben:The ALICE Collaboration*
Beschreibung
Zusammenfassung:On 23rd November 2009, during the early commissioning of the CERN Large Hadron Collider (LHC), two counter-rotating proton bunches were circulated for the first time concurrently in the machine, at the LHC injection energy of 450 GeV per beam. Although the proton intensity was very low, with only one pilot bunch per beam, and no systematic attempt was made to optimize the collision optics, all LHC experiments reported a number of collision candidates. In the ALICE experiment, the collision region was centred very well in both the longitudinal and transverse directions and 284 events were recorded in coincidence with the two passing proton bunches. The events were immediately reconstructed and analyzed both online and offline. We have used these events to measure the pseudorapidity density of charged primary particles in the central region. In the range |η|<0.5, we obtain dNch/dη=3.10±0.13(stat.)±0.22(syst.) for all inelastic interactions, and dNch/dη=3.51±0.15(stat.)±0.25(syst.) for non-single diffractive interactions. These results are consistent with previous measurements in proton-antiproton interactions at the same centre-of-mass energy at the CERN Sp$\overline{\mathrm{p}
Beschreibung:Online veröffentlicht: 11 December 2009
*The ALICE Collaboration: K. Aamodt, V. Angelov, O. Busch, P. Glässel, R. Grajcarek, N. Herrmann, J. Klein, J. Mercado Pérez, K. Oyama, Y. Pachmayer, R. Schicker, K. Schweda, H.K. Soltveit, J. Stachel, S. Vallero, B. Windelband [und sehr viele weitere Personen]
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Beschreibung:Online Resource
ISSN:1434-6052
DOI:10.1140/epjc/s10052-009-1227-4

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