The pseudorapidity density and multiplicity distribution of charged particles produced in proton-proton collisions at the LHC, at a centre-of-mass energy root s = 7 TeV, were measured in the central pseudorapidity region vertical bar eta vertical bar < 1. Comparisons are made with previous measurements at root s = 0.9 TeV and 2.36 TeV. At root s = 7 TeV, for events with at least one charged particle in |eta vertical bar| < 1, we obtain dN(ch)/d eta = 6.01 +/- 0.01(stat.)(-0.12)(+0.20) (syst.). This corresponds to an increase of 57.6%+/-0.4%(stat.)(-1.8%)(+3.6) (syst.) relative to collisions at 0.9 TeV, significantly higher than calculations from commonly used models. The multiplicity distribution at 7 TeV is described fairly well by the negative binomial distribution.

Charged-particle multiplicity measurement in proton-proton collisions at sqrt(s) = 7 TeV with ALICE at LHC / Aamodt, K., Abel, N., Abeysekara, U., Abrahantes Quintana, A., Abramyan, A., Adamová, D., Aggarwal, M.M., Aglieri Rinella, G., Agocs, A.G., Aguilar Salazar, S., Ahammed, Z., Ahmad, A., Ahmad, N., Ahn, S.U., Akimoto, R., Akindinov, A., Aleksandrov, D., Alessandro, B., Alfaro Molina, R., Alici, A., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - STAMPA. - 68:3-4(2010), pp. 345-354. [10.1140/epjc/s10052-010-1350-2]

Charged-particle multiplicity measurement in proton-proton collisions at sqrt(s) = 7 TeV with ALICE at LHC

Bruno, G. E.;
2010

Abstract

The pseudorapidity density and multiplicity distribution of charged particles produced in proton-proton collisions at the LHC, at a centre-of-mass energy root s = 7 TeV, were measured in the central pseudorapidity region vertical bar eta vertical bar < 1. Comparisons are made with previous measurements at root s = 0.9 TeV and 2.36 TeV. At root s = 7 TeV, for events with at least one charged particle in |eta vertical bar| < 1, we obtain dN(ch)/d eta = 6.01 +/- 0.01(stat.)(-0.12)(+0.20) (syst.). This corresponds to an increase of 57.6%+/-0.4%(stat.)(-1.8%)(+3.6) (syst.) relative to collisions at 0.9 TeV, significantly higher than calculations from commonly used models. The multiplicity distribution at 7 TeV is described fairly well by the negative binomial distribution.
2010
Charged-particle multiplicity measurement in proton-proton collisions at sqrt(s) = 7 TeV with ALICE at LHC / Aamodt, K., Abel, N., Abeysekara, U., Abrahantes Quintana, A., Abramyan, A., Adamová, D., Aggarwal, M.M., Aglieri Rinella, G., Agocs, A.G., Aguilar Salazar, S., Ahammed, Z., Ahmad, A., Ahmad, N., Ahn, S.U., Akimoto, R., Akindinov, A., Aleksandrov, D., Alessandro, B., Alfaro Molina, R., Alici, A., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - STAMPA. - 68:3-4(2010), pp. 345-354. [10.1140/epjc/s10052-010-1350-2]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/9099
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