The ALICE Collaboration

doi:10.1016/J.NUCLPHYSA.2009.10.142

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Journal Article•DOI•

Tuning Monte Carlo Generators: The Perugia Tunes

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Peter Skands¹•Institutions (1)

CERN¹

20 Oct 2010-Physical Review D

TL;DR: In this article, the p{sub perpendicular}-ordered shower and underlying event model in Pythia 6.4 is updated and supersede the older "S0" family, and a set of 8 related "Perugia variations" that attempt to systematically explore soft, hard, parton density, and color structure variations in the theoretical parameters.

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Abstract: We present 9 new tunes of the p{sub perpendicular}-ordered shower and underlying-event model in Pythia 6.4. These 'Perugia' tunes update and supersede the older 'S0' family. The data sets used to constrain the models include hadronic Z{sup 0} decays at LEP, Tevatron min-bias data at 630, 1800, and 1960 GeV, Tevatron Drell-Yan data at 1800 and 1960 GeV, and SPS min-bias data at 200, 546, and 900 GeV. In addition to the central parameter set, called 'Perugia 0', we introduce a set of 8 related 'Perugia variations' that attempt to systematically explore soft, hard, parton density, and color structure variations in the theoretical parameters. Based on these variations, a best-guess prediction of the charged track multiplicity in inelastic, nondiffractive minimum-bias events at the LHC is made. Note that these tunes can only be used with Pythia 6, not with Pythia 8.

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1,056 citations

Cites methods from "The ALICE Collaboration"

...Combined with early indications at 7 TeV from ALICE [100] and CMS [101] that, likewise, confirm an undershooting by the models of the high-multiplicity tail, we observe that it may be particularly difficult to describe both the Tevatron and LHC data sets simultaneously and that more work in this direction would be fruitful....
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...– Increased baryon transport from the beam remnant (though still less than the Perugia SOFT tune), motivated by p̄/p and Λ̄/Λ measurements performed by the ALICE [108] and LHCb experiments [109]....
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...• Take into account some of the early lessons of LHC minimum-bias and underlying-event data at 900 and 7000 GeV: – Faster scaling of multiplicities with energy, motivated, e.g., by the ALICE [100] and ATLAS [102] min-bias charged multiplicity measurements....
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...– Increased baryon production, especially of strange baryons (larger Λ/K ratio), motivated by identified-particle measurements by the ALICE [105,106] and CMS [107] experiments and by the p/π ratio measured by STAR [47]....
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Journal Article•DOI•

EPOS LHC: Test of collective hadronization with data measured at the CERN Large Hadron Collider

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Tanguy Pierog¹, Iu. Karpenko², Judith Katzy, E. Yatsenko, Klaus Werner³ - Show less +1 more•Institutions (3)

Karlsruhe Institute of Technology¹, Frankfurt Institute for Advanced Studies², University of Nantes³

14 Sep 2015-Physical Review C

TL;DR: In this article, the authors describe the changes required to the model to reproduce in detail the new data available from LHC and the consequences in the interpretation of these data, in particular the effect of the collective hadronization in p-p scattering.

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Abstract: EPOS is a Monte-Carlo event generator for minimum bias hadronic interac- tions, used for both heavy ion interactions and cosmic ray air shower simulations. Since the last public release in 2009, the LHC experiments have provided a number of very inter- esting data sets comprising minimum bias p-p, p-Pb and Pb-Pb interactions. We describe the changes required to the model to reproduce in detail the new data available from LHC and the consequences in the interpretation of these data. In particular we discuss the effect of the collective hadronization in p-p scattering. A different parametrization of flow has been introduced in the case of a small volume with high density of thermalized matter (core) reached in p-p compared to large volume produced in heavy ion collisions. Both parametrizations depend only on the geometry and the amount of secondary particles en- tering in the core and not on the beam mass or energy. The transition between the two flow regimes can be tested with p-Pb data. EPOS LHC is able to reproduce all minimum bias results for all particles with transverse momentum from pt = 0 to a few GeV/c.

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939 citations

Cites background from "The ALICE Collaboration"

...The same problem is observed with ALICE data on multistrange baryon production [59]....
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Proceedings Article•DOI•

About these proceedings

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Christian Boitet

23 Aug 1992

TL;DR: Mes premiers remtrciements trout aux auteurs des 206 communications th6matiquts et notes de projet, sans qui ces actes n'auraient 6videmment pas vu le jour.

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Abstract: Mes premiers remtrciements trout aux auteurs des 206 communications th6matiquts et notes de projet, sans qui ces actes n'auraient 6videmment pas vu le jour. / Is oat contribu6 h la qualit6 scientifique et ,5 I'hmuog6t~6it6 pr6sentationntlle de leurs articles en refondant les versions iuitiales soumises an comit6 de programme, ea acceptant de suivre les r~gles de pr6sentation indiqu6es, et en nous envoyant parrots plusieurs versions am61ior6es surun point ou sur l'autrc.

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824 citations

Journal Article•DOI•

Centrality Dependence of the Charged-Particle Multiplicity Density at Midrapidity in Pb-Pb Collisions at root s(NN)=2.76 TeV

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K. Aamodt¹, A. Abrahantes Quintana, Dagmar Adamová², Andrew Marshall Adare³ +938 more•Institutions (80)

20 Jan 2011-Physical Review Letters

TL;DR: In this paper, the centrality dependence of the chargedparticle multiplicity density at midrapidity in Pb-Pb collisions at root s(NN) = 2: 76 TeV is presented.

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Abstract: The centrality dependence of the charged-particle multiplicity density at midrapidity in Pb-Pb collisions at root s(NN) = 2: 76 TeV is presented. The charged-particle density normalized per participating nucleon pair increases by about a factor of 2 from peripheral (70%-80%) to central (0%-5%) collisions. The centrality dependence is found to be similar to that observed at lower collision energies. The data are compared with models based on different mechanisms for particle production in nuclear collisions.

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553 citations

Journal Article•DOI•

The alice experiment at the CERN LHC

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Paulus Gerardus Kuijer

01 Apr 2003

TL;DR: ALICE as discussed by the authors is a general-purpose heavy-ion detector designed to study the physics of strongly interacting matter and the quark-gluon plasma in nucleus-nucleus collisions at the LHC at a center of mass energy of 5.5 TeV/nucleon.

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Abstract: ALICE is a general-purpose heavy-ion detector designed to study the physics of strongly interacting matter and the quark-gluon plasma in nucleus-nucleus collisions at the LHC at a center of mass energy of 5.5 TeV/nucleon. It is currently under construction and will be ready for data taking at LHC turn-on in 2007. The collaboration currently includes more than 900 physicists, both from nuclear physics and high-energy physics, from over 70 institutions in 27 countries.

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546 citations