-
[show abstract]
[hide abstract]
ABSTRACT: The emissions of heavy metals during incineration of Municipal Solid Waste (MSW) are a major issue to health and the environment. It is then necessary to well quantify these emissions in order to accomplish an adequate control and prevent the heavy metals from leaving the stacks. In this study the kinetic behavior of Cadmium during Fluidized Bed Incineration (FBI) of artificial MSW pellets, for bed temperatures ranging from 923 to 1073K, was modeled. FLUENT 12.1.4 was used as the modeling framework for the simulations and implemented together with a complete set of user-defined functions (UDFs). The CFD model combines the combustion of a single solid waste particle with heavy metal (HM) vaporization from the burning particle, and it takes also into account both pyrolysis and volatiles' combustion. A kinetic rate law for the Cd release, derived from the CFD thermal analysis of the combusting particle, is proposed. The simulation results are compared with experimental data obtained in a lab-scale fluidized bed incinerator reported in literature, and with the predicted values from a particulate non-isothermal model, formerly developed by the authors. The comparison shows that the proposed CFD model represents very well the evolution of the HM release for the considered range of bed temperature.
Journal of hazardous materials 03/2013; 248-249C:276-84. · 4.14 Impact Factor
-
PANDA Collaboration,
W. Erni,
I. Keshelashvili,
B. Krusche,
M. Steinacher,
Y. Heng,
Z. Liu,
H. Liu,
X. Shen,
Q. Wang, [......],
S. Wronka,
A. Wysocka,
B. Zwieglinski,
P. Bühler,
O. Hartman,
P. Kienle,
J. Marton,
K. Suzuki,
E. Widmann,
J. Zmeskal
[show abstract]
[hide abstract]
ABSTRACT: This document describes the technical layout and the expected performance of
the Straw Tube Tracker (STT), the main tracking detector of the PANDA target
spectrometer. The STT encloses a Micro-Vertex-Detector (MVD) for the inner
tracking and is followed in beam direction by a set of GEM-stations. The tasks
of the STT are the measurement of the particle momentum from the reconstructed
trajectory and the measurement of the specific energy-loss for a particle
identification. Dedicated simulations with full analysis studies of certain
proton-antiproton reactions, identified as being benchmark tests for the whole
PANDA scientific program, have been performed to test the STT layout and
performance. The results are presented, and the time lines to construct the STT
are described.
European Physical Journal A 02/2013; 49(25):1-104. · 2.19 Impact Factor
-
PANDA Collaboration,
W. Erni,
I. Keshelashvili,
B. Krusche,
M. Steinacher,
Y. Heng,
Z. Liu,
H. Liu,
X. Shen,
Q. Wang, [......],
M. Plominski,
J. Szewinski,
K. Traczyk,
B. Zwieglinski,
P. Bühler,
A. Gruber,
P. Kienle,
J. Marton,
E. Widmann,
J. Zmeskal
[show abstract]
[hide abstract]
ABSTRACT: This document illustrates the technical layout and the expected performance
of the Micro Vertex Detector (MVD) of the PANDA experiment. The MVD will detect
charged particles as close as possible to the interaction zone. Design criteria
and the optimisation process as well as the technical solutions chosen are
discussed and the results of this process are subjected to extensive Monte
Carlo physics studies. The route towards realisation of the detector is
outlined.
07/2012;
-
The ALICE Collaboration,
K. Aamodt,
N. Abel,
U. Abeysekara,
A. Abrahantes Quintana,
A. Acero,
D. Adamová,
M. M. Aggarwal,
G. Aglieri Rinella,
A. G. Agocs, [......],
X. Zhang,
D. Zhou,
S. Zhou,
J. Zhu,
A. Zichichi,
A. Zinchenko,
G. Zinovjev,
M. Zinovjev,
Y. Zoccarato,
V. Zycháček
[show abstract]
[hide abstract]
ABSTRACT: 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 450GeV 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 dN
ch/dη=3.10±0.13(stat.)±0.22(syst.) for all inelastic interactions, and dN
ch/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
[`(p)]\overline{\mathrm{p}}
S collider. They also illustrate the excellent functioning and rapid progress of the LHC accelerator, and of both the hardware
and software of the ALICE experiment, in this early start-up phase.
European Physical Journal C 04/2012; 65(1):111-125. · 3.63 Impact Factor
-
The ALICE Collaboration,
K. Aamodt,
N. Abel,
U. Abeysekara,
A. Abrahantes Quintana,
A. Abramyan,
D. Adamová,
M. M. Aggarwal,
G. Aglieri Rinella,
A. G. Agocs, [......],
X. Zhang,
D. Zhou,
S. Zhou,
J. Zhu,
A. Zichichi,
A. Zinchenko,
G. Zinovjev,
Y. Zoccarato,
V. Zycháček,
M. Zynovyev
[show abstract]
[hide abstract]
ABSTRACT: The production of π
+, π
−, K+, K−, p, and [`(p)]\overline{\mathrm{p}} at mid-rapidity has been measured in proton-proton collisions at Ös = 900GeV\sqrt{s} = 900~\mathrm{GeV} with the ALICE detector. Particle identification is performed using the specific energy loss in the inner tracking silicon
detector and the time projection chamber. In addition, time-of-flight information is used to identify hadrons at higher momenta.
Finally, the distinctive kink topology of the weak decay of charged kaons is used for an alternative measurement of the kaon
transverse momentum (p
t) spectra. Since these various particle identification tools give the best separation capabilities over different momentum
ranges, the results are combined to extract spectra from p
t=100MeV/c to 2.5 GeV/c. The measured spectra are further compared with QCD-inspired models which yield a poor description. The total yields and
the mean p
t are compared with previous measurements, and the trends as a function of collision energy are discussed.
European Physical Journal C 04/2012; 71(6):1-22. · 3.63 Impact Factor
-
K. Aamodt,
A. Abrahantes Quintana,
D. Adamová,
A. M. Adare,
M. M. Aggarwal,
G. Aglieri Rinella,
A. G. Agocs,
S. Aguilar Salazar,
Z. Ahammed,
N. Ahmad, [......],
P. Zelnicek,
A. Zenin,
I. Zgura,
M. Zhalov,
X. Zhang,
D. Zhou,
A. Zichichi,
G. Zinovjev,
Y. Zoccarato,
M. Zynovyev
[show abstract]
[hide abstract]
ABSTRACT: The production of mesons containing strange quarks ($\mbox {$\mbox {, φ) and both singly and doubly strange baryons ($\mbox {$\mbox {, $\mbox {$\mbox {, and $\mbox {$\mbox {) are measured at mid-rapidity in pp collisions at
_boxclose_boxclose_boxclose\sqrt{s}=0.9TeV{\rm TeV} with the ALICE experiment at the LHC. The results are obtained from the analysis of about 250k minimum bias events recorded
in 2009. Measurements of yields (dN/dy) and transverse momentum spectra at mid-rapidity for inelastic pp collisions are presented. For mesons, we report yields
(〈dN/dy〉) of 0.184±0.002(stat.)±0.006(syst.) for $\mbox {$\mbox { and 0.021±0.004(stat.)±0.003(syst.) forφ. For baryons, we find 〈dN/dy〉=0.048±0.001(stat.)±0.004(syst.) for $\mbox {$\mbox {, 0.047±0.002(stat.)±0.005(syst.) for $\mbox {$\mbox { and 0.0101±0.0020(stat.)±0.0009(syst.) for $\mbox {$\mbox {. The results are also compared with predictions for identified particle spectra from QCD-inspired models and provide a baseline
for comparisons with both future pp measurements at higher energies and heavy-ion collisions.
European Physical Journal C 04/2012; 71(3):1-24. · 3.63 Impact Factor
-
The ALICE Collaboration,
K. Aamodt,
N. Abel,
U. Abeysekara,
A. Abrahantes Quintana,
A. Abramyan,
D. Adamová,
M. M. Aggarwal,
G. Aglieri Rinella,
A. G. Agocs, [......],
X. Zhang,
D. Zhou,
S. Zhou,
J. Zhu,
A. Zichichi,
A. Zinchenko,
G. Zinovjev,
Y. Zoccarato,
V. Zycháček,
M. Zynovyev
[show abstract]
[hide abstract]
ABSTRACT: Charged-particle production was studied in proton–proton collisions collected at the LHC with the ALICE detector at centre-of-mass
energies 0.9TeV and 2.36TeV in the pseudorapidity range |η|<1.4. In the central region (|η|<0.5), at 0.9TeV, we measure charged-particle pseudorapidity density dNch/dh = 3.02±0.01(stat.)+0.08-0.05(syst.)\mathrm{d}N_{\mathrm{ch}}/\mathrm{d}\eta=3.02\pm 0.01(\mathit{stat.})^{+0.08}_{-0.05}(\mathit{syst.}) for inelastic interactions, and dNch/dh = 3.58±0.01(stat.)+0.12-0.12(syst.)\mathrm{d}N_{\mathrm{ch}}/\mathrm{d}\eta=3.58\pm0.01(\mathit{stat.})^{+0.12}_{-0.12}(\mathit{syst.}) for non-single-diffractive interactions. At 2.36TeV, we find dNch/dh = 3.77±0.01(stat.)+0.25-0.12(syst.)\mathrm{d}N_{\mathrm{ch}}/\mathrm{d}\eta=3.77\pm0.01(\mathit{stat.})^{+0.25}_{-0.12}(\mathit{syst.}) for inelastic, and dNch/dh = 4.43±0.01(stat.)+0.17-0.12(syst.)\mathrm{d}N_{\mathrm{ch}}/\mathrm{d}\eta=4.43\pm0.01(\mathit{stat.})^{+0.17}_{-0.12}(\mathit{syst.}) for non-single-diffractive collisions. The relative increase in charged-particle multiplicity from the lower to higher energy
is 24.7%±0.5%(stat.)+5.7-2.8%(syst.)24.7\%\pm0.5\%(\mathit{stat.})^{+5.7}_{-2.8}\%(\mathit{syst.}) for inelastic and 23.7%±0.5%(stat.)+4.6-1.1%(syst.)23.7\%\pm0.5\%(\mathit{stat.})^{+4.6}_{-1.1}\%(\mathit{syst.}) for non-single-diffractive interactions. This increase is consistent with that reported by the CMS collaboration for non-single-diffractive
events and larger than that found by a number of commonly used models. The multiplicity distribution was measured in different
pseudorapidity intervals and studied in terms of KNO variables at both energies. The results are compared to proton–antiproton
data and to model predictions.
European Physical Journal C 04/2012; 68(1):89-108. · 3.63 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: The GigaBit Transceiver (GBT) project aims at the design of a radiation tolerant chip set for high speed optical data transmission. The chipset includes the GigaBit Laser Driver (GBLD), a radiation tolerant ASIC designed in a standard CMOS 130 nm technology. The GBLD is a laser driver designed to work to up to 5 Gb/s and capable to drive both Vertical Cavity Surface Emitting Lasers (VCSELs) and Edge Emitting Lasers (EELs). The GBLD can provide a modulation current up to 24 mA and a bias current up to 43 mA with the pre-emphasis function to compensate for external capacitive load.
Journal of Instrumentation 01/2012; 7(01):C01052. · 1.87 Impact Factor
-
K Aamodt,
A Abrahantes Quintana,
D Adamova,
A M Adare,
M M Aggarwal,
Aglieri G Rinella,
A G Agocs,
S Aguilar Salazar,
Z Ahammed,
N Ahmad, [......],
I Zgura,
M Zhalov,
X Zhang,
D Zhou,
X Zhu,
A Zichichi,
G Zinovjev,
Y Zoccarato,
M Zynovyev,
ALICE Collaboration
Physics Letters B 01/2011; 696(4):328-337. · 3.95 Impact Factor
-
K Aamodt,
A Abrahantes Quintana,
D Adamová,
A M Adare,
M M Aggarwal,
G Aglieri Rinella,
A G Agocs,
S Aguilar Salazar,
Z Ahammed,
N Ahmad, [......],
A Zenin,
I Zgura,
M Zhalov,
X Zhang,
D Zhou,
X Zhu,
A Zichichi,
G Zinovjev,
Y Zoccarato,
M Zynovyev
[show abstract]
[hide abstract]
ABSTRACT: The centrality dependence of the charged-particle multiplicity density at midrapidity in Pb-Pb collisions at sqrt[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.
Physical Review Letters 01/2011; 106(3):032301. · 7.37 Impact Factor
-
ALICE Collaboration,
K. Aamodt,
A. Abrahantes Quintana,
D Adamová,
A. M. Adare,
M. M. Aggarwal,
G. Aglieri Rinella,
A. G. Agocs,
S. Aguilar Salazar,
Z. Ahammed, [......],
A. Zenin,
I. Zgura,
M. Zhalov,
X Zhang,
D Zhou,
X Zhu,
A. Zichichi,
G. Zinovjev,
Y. Zoccarato,
M. Zynovyev
[show abstract]
[hide abstract]
ABSTRACT: The first measurement of two-pion Bose--Einstein correlations in central PbPb
collisions at sqrt(s_NN) = 2.76 TeV at the Large Hadron Collider is presented.
We observe a growing trend with energy now not only for the longitudinal and
the outward but also for the sideward pion source radius. The pion homogeneity
volume and the decoupling time are significantly larger than those measured at
RHIC.
12/2010;
-
K Aamodt,
B Abelev,
A Abrahantes Quintana,
D Adamová,
A M Adare,
M M Aggarwal,
G Aglieri Rinella,
A G Agocs,
S Aguilar Salazar,
Z Ahammed, [......],
P Zelnicek,
A Zenin,
I Zgura,
M Zhalov,
X Zhang,
D Zhou,
A Zichichi,
G Zinovjev,
Y Zoccarato,
M Zynovyev
[show abstract]
[hide abstract]
ABSTRACT: We report the first measurement of charged particle elliptic flow in Pb-Pb collisions at sqrt[S(NN)] =2.76 TeV with the ALICE detector at the CERN Large Hadron Collider. The measurement is performed in the central pseudorapidity region (|η|<0.8) and transverse momentum range 0.2<p t<5.0 GeV/c. The elliptic flow signal v₂, measured using the 4-particle correlation method, averaged over transverse momentum and pseudorapidity is 0.087 ± 0.002(stat) ± 0.003(syst) in the 40%-50% centrality class. The differential elliptic flow v₂ p t reaches a maximum of 0.2 near p t =3 GeV/c. Compared to RHIC Au-Au collisions at sqrt[S(NN)] 200 GeV, the elliptic flow increases by about 30%. Some hydrodynamic model predictions which include viscous corrections are in agreement with the observed increase.
Physical Review Letters 12/2010; 105(25):252302. · 7.37 Impact Factor
-
K Aamodt,
B Abelev,
A Abrahantes Quintana,
D Adamová,
A M Adare,
M M Aggarwal,
G Aglieri Rinella,
A G Agocs,
S Aguilar Salazar,
Z Ahammed, [......],
P Zelnicek,
A Zenin,
I Zgura,
M Zhalov,
X Zhang,
D Zhou,
A Zichichi,
G Zinovjev,
Y Zoccarato,
M Zynovyev
[show abstract]
[hide abstract]
ABSTRACT: The first measurement of the charged-particle multiplicity density at midrapidity in Pb-Pb collisions at a center-of-mass energy per nucleon pair √ S NN = 2.76 TeV is presented. For an event sample corresponding to the most central 5% of the hadronic cross section, the pseudorapidity density of primary charged particles at midrapidity is 1584 ± 4(stat) ± 76(syst), which corresponds to 8.3 ± 0.4(syst) per participating nucleon pair. This represents an increase of about a factor 1.9 relative to pp collisions at similar collision energies, and about a factor 2.2 to central Au-Au collisions at √ S NN = 2.76 TeV. This measurement provides the first experimental constraint for models of nucleus-nucleus collisions at LHC energies.
Physical Review Letters 12/2010; 105(25):252301. · 7.37 Impact Factor
-
K Aamodt,
N Abel,
U Abeysekara,
A Abrahantes Quintana,
A Abramyan,
D Adamová,
M M Aggarwal,
G Aglieri Rinella,
A G Agocs,
S Aguilar Salazar, [......],
X Zhang,
D Zhou,
S Zhou,
J Zhu,
A Zichichi,
A Zinchenko,
G Zinovjev,
Y Zoccarato,
V Zychácek,
M Zynovyev
[show abstract]
[hide abstract]
ABSTRACT: The ratio of the yields of antiprotons to protons in pp collisions has been measured by the ALICE experiment at sqrt[s]=0.9 and 7 TeV during the initial running periods of the Large Hadron Collider. The measurement covers the transverse momentum interval 0.45<p_{t}<1.05 GeV/c and rapidity |y|<0.5. The ratio is measured to be R_{|y|<0.5}=0.957±0.006(stat)±0.014(syst) at 0.9 TeV and R_{|y|<0.5}=0.991±0.005(stat)±0.014(syst) at 7 TeV and it is independent of both rapidity and transverse momentum. The results are consistent with the conventional model of baryon-number transport and set stringent limits on any additional contributions to baryon-number transfer over very large rapidity intervals in pp collisions.
Physical Review Letters 08/2010; 105(7):072002. · 7.37 Impact Factor
-
ALICE Collaboration,
K. Aamodt,
N. Abel,
U. Abeysekara,
A. Abrahantes Quintana,
A. Abramyan,
D. Adamova,
M. M. Aggarwal,
G. Aglieri Rinella,
A. G. Agocs, [......],
X Zhang,
D Zhou,
S Zhou,
J Zhu,
A. Zichichi,
A Zinchenko,
G. Zinovjev,
Y. Zoccarato,
V. Zychacek,
M. Zynovyev
[show abstract]
[hide abstract]
ABSTRACT: The inclusive charged particle transverse momentum distribution is measured in proton-proton collisions at $\sqrt{s} = 900$~GeV at the LHC using the ALICE detector. The measurement is performed in the central pseudorapidity region $(|\eta|<0.8)$ over the transverse momentum range $0.15_{\rm INEL}=0.483\pm0.001$~(stat.)~$\pm0.007$~(syst.)~GeV/$c$ and $\left_{\rm NSD}=0.489\pm0.001$~(stat.)~$\pm0.007$~(syst.)~GeV/$c$, respectively. The data exhibit a slightly larger $\left$ than measurements in wider pseudorapidity intervals. The results are compared to simulations with the Monte Carlo event generators PYTHIA and PHOJET. Comment: 20 pages, 8 figures, accepted for publication in Phys. Lett. B
07/2010;
-
K. Aamodt,
N. Abel,
U. Abeysekara,
A. Abrahantes Quintana,
A. Abramyan,
D. Adamova,
M. M. Aggarwal,
G. Aglieri Rinella,
A. G. Agocs,
S. Aguilar Salazar, [......],
X Zhang,
D Zhou,
S Zhou,
J Zhu,
A. Zichichi,
A Zinchenko,
G. Zinovjev,
Y. Zoccarato,
V. Zychacek,
M. Zynovyev
[show abstract]
[hide abstract]
ABSTRACT: We report on the measurement of two-pion correlation functions from pp
collisions at sqrt(s)=900 GeV performed by the ALICE experiment at the Large
Hadron Collider. Our analysis shows an increase of the HBT radius with
increasing event multiplicity, in line with other measurements done in
particle- and nuclear collisions. Conversely, the strong decrease of the radius
with increasing transverse momentum, as observed at RHIC and at Tevatron, is
not manifest in our data.
07/2010;
-
Authors: ALICE Collaboration: K. Aamodt,
N. Abel,
U. Abeysekara,
A. Abrahantes Quintana,
A. Abramyan,
D. Adamova,
M. M. Aggarwal,
G. Aglieri Rinella,
A. G. Agocs,
S. Aguilar Salazar, [......],
X Zhang,
D Zhou,
S Zhou,
J Zhu,
A. Zichichi,
A Zinchenko,
G. Zinovjev,
Y. Zoccarato,
V. Zychacek,
M. Zynovyev
[show abstract]
[hide abstract]
ABSTRACT: The ratio of the yields of antiprotons to protons in pp collisions has been measured by the ALICE experiment at $\sqrt{s} = 0.9$ and $7$~TeV during the initial running periods of the Large Hadron Collider(LHC). The measurement covers the transverse momentum interval $0.45 < p_{\rm{t}} < 1.05$~GeV/$c$ and rapidity $|y| < 0.5$. The ratio is measured to be $R_{|y| < 0.5} = 0.957 \pm 0.006 (stat.) \pm 0.014 (syst.)$ at $0.9$~TeV and $R_{|y| < 0.5} = 0.991 \pm 0.005 (stat.) \pm 0.014 (syst.)$ at $7$~TeV and it is independent of both rapidity and transverse momentum. The results are consistent with the conventional model of baryon-number transport and set stringent limits on any additional contributions to baryon-number transfer over very large rapidity intervals in pp collisions. Comment: Submitted in PRL: 12 pages, 4 figures
06/2010;
-
K Aamodt,
N Abel,
U Abeysekara,
A Abrahantes Quintana,
A Abramyan,
D Adamová,
M M Aggarwal,
G Aglieri Rinella,
A G Agocs,
S Aguilar Salazar, [......],
X Zhang,
D Zhou,
S Zhou,
J Zhu,
A Zichichi,
A Zinchenko,
G Zinovjev,
Y Zoccarato,
V Zychávcek,
M Zynovyev
European Physical Journal C 06/2010; 68(3-4):345-354. · 3.63 Impact Factor
-
K. Aamodt,
N. Abel,
U. Abeysekara,
A. Abrahantes Quintana,
A. Abramyan,
D. Adamova,
M. M. Aggarwal,
G. Aglieri Rinella,
A. G. Agocs,
S. Aguilar Salazar, [......],
X Zhang,
D Zhou,
S Zhou,
J Zhu,
A. Zichichi,
A Zinchenko,
G. Zinovjev,
Y. Zoccarato,
V. Zychacek,
M. Zynovyev
[show abstract]
[hide abstract]
ABSTRACT: The pseudorapidity density and multiplicity distribution of charged particles produced in proton-proton collisions at the LHC, at a centre-of-mass energy sqrt(s) = 7 TeV, were measured in the central pseudorapidity region |eta| < 1. Comparisons are made with previous measurements at sqrt(s) = 0.9 TeV and 2.36 TeV. At sqrt(s) = 7 TeV, for events with at least one charged particle in |eta| < 1, we obtain dNch/deta = 6.01 +- 0.01 (stat.) +0.20 -0.12 (syst.). This corresponds to an increase of 57.6% +- 0.4% (stat.) +3.6 -1.8% (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. Comment: accepted by EPJC - version2: small updates to the text and author list
04/2010;
-
K. Aamodt,
N. Abel,
U. Abeysekara,
A. Abrahantes Quintana,
A. Abramyan,
D. Adamova,
M. M. Aggarwal,
G. Aglieri Rinella,
A. G. Agocs,
S. Aguilar Salazar, [......],
X Zhang,
D Zhou,
S Zhou,
J Zhu,
A. Zichichi,
A Zinchenko,
G. Zinovjev,
Y. Zoccarato,
V. Zychacek,
M. Zynovyev
[show abstract]
[hide abstract]
ABSTRACT: Charged-particle production was studied in proton-proton collisions collected at the LHC with the ALICE detector at centre-of-mass energies 0.9 TeV and 2.36 TeV in the pseudorapidity range |eta| < 1.4. In the central region (|eta| < 0.5), at 0.9 TeV, we measure charged-particle pseudorapidity density dNch/deta = 3.02 +- 0.01 (stat.) +0.08 -0.05 (syst.) for inelastic interactions, and dNch/deta = 3.58 +- 0.01 (stat.) +0.12 -0.12 (syst.) for non-single-diffractive interactions. At 2.36 TeV, we find dNch/deta = 3.77 +- 0.01 (stat.) +0.25 -0.12 (syst.) for inelastic, and dNch/deta = 4.43 +- 0.01 (stat.) +0.17 -0.12 (syst.) for non-single-diffractive collisions. The relative increase in charged-particle multiplicity from the lower to higher energy is 24.7% +- 0.5% (stat.) +5.7% -2.8% (syst.) for inelastic and 23.7% +- 0.5% (stat.) +4.6% -1.1% (syst.) for non-single-diffractive interactions. This increase is consistent with that reported by the CMS collaboration for non-single-diffractive events and larger than that found by a number of commonly used models. The multiplicity distribution was measured in different pseudorapidity intervals and studied in terms of KNO variables at both energies. The results are compared to proton-antiproton data and to model predictions. Comment: accepted by EPJC; version2: minor updates to the text and author list
04/2010;
