38 research outputs found
Centrality Dependence Of The Pseudorapidity Density Distribution For Charged Particles In Pb-pb Collisions At √snn=2.76tev
- Author
- Abbas E.
- Abelev B.
- Adam J.
- Adamova D.
- Adare A.M.
- Aggarwal M.M.
- Aglieri Rinella G.
- Agnello M.
- Agocs A.G.
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- Ahammed Z.
- Ahmad Masoodi A.
- Ahmad N.
- Ahn S.A.
- Ahn S.U.
- Aimo I.
- Ajaz M.
- Akindinov A.
- Aleksandrov D.
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- Alici A.
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- Publication venue
- 'Elsevier BV'
- Publication date
- 26/11/2015
- Field of study
7264/Mai61062
Charged kaon femtoscopic correlations in pp collisions at root s=7 TeV
- Publication venue
- Publication date
- 01/01/2013
- Field of study
Correlations of two charged identical kaons (KchKch) are measured in pp
collisions at root s = 7 TeV by the ALICE experiment at the Large Hadron
Collider (LHC). One-dimensional (KKch)-K-ch correlation functions are
constructed in three multiplicity and four transverse momentum ranges.
The (KKch)-K-ch femtoscopic source parameters R and lambda are
extracted. The (KKch)-K-ch correlations show a slight increase of
femtoscopic radii with increasing multiplicity and a slight decrease of
radii with increasing transverse momentum. These trends are similar to
the ones observed for pi pi and K-s(0) K-s(0) correlations in pp and
heavy-ion collisions. However at high multiplicities, there is an
indication that the one-dimensional correlation radii for charged kaons
are larger than those for pions in contrast to what was observed in
heavy-ion collisions at the Relativistic Heavy-Ion Collider.
DOI:10.1103/PhysRevD.87.05201
Centrality determination of Pb-Pb collisions at root s(NN)=2.76 TeV with ALICE
- Publication venue
- Publication date
- 01/01/2013
- Field of study
This publication describes the methods used to measure the centrality of
inelastic Pb-Pb collisions at a center-of-mass energy of 2.76 TeV per
colliding nucleon pair with ALICE. The centrality is a key parameter in
the study of the properties of QCD matter at extreme temperature and
energy density, because it is directly related to the initial overlap
region of the colliding nuclei. Geometrical properties of the collision,
such as the number of participating nucleons and the number of binary
nucleon-nucleon collisions, are deduced from a Glauber model with a
sharp impact parameter selection and shown to be consistent with those
extracted from the data. The centrality determination provides a tool to
compare ALICE measurements with those of other experiments and with
theoretical calculations
Mid-rapidity anti-baryon to baryon ratios in pp collisions at root s=0.9, 2.76 and 7 TeV measured by ALICE
- Publication venue
- Publication date
- 01/01/2013
- Field of study
The ratios of yields of anti-baryons to baryons probes the mechanisms of
baryon-number transport. Results for (p) over bar /p, (Lambda) over
bar/Lambda, (Xi) over bar (+)/(Xi) over bar (-) and (Omega) over bar
(+)/(Omega) over bar (-) in pp collisions at root s = 0.9, 2.76 and 7
TeV, measured with the ALICE detector at the LHC, are reported. Within
the experimental uncertainties and ranges covered by our measurement,
these ratios are independent of rapidity, transverse momentum and
multiplicity for all measured energies. The results are compared to
expectations from event generators, such as PYTHIA and HIJING/B, that
are used to model the particle production in pp collisions. The energy
dependence of (p) over bar /p, (Lambda) over bar/(Lambda) over bar, (Xi)
over bar (+)/(Xi) over bar (-) and (Omega) over bar (+)/(Omega) over bar
(-), reaching values compatible with unity for root s = 7 TeV,
complement the earlier (p) over bar /p measurement of ALICE. These
dependencies can be described by exchanges with the Regge-trajectory
intercept of alpha(J) approximate to 0.5, which are suppressed with
increasing rapidity interval Delta y. Any significant contribution of an
exchange not suppressed at large Delta y (reached at LHC energies) is
disfavoured
Upgrade of the ALICE Experiment Letter Of Intent
- Publication venue
- Publication date
- 01/01/2014
- Field of study
Pseudorapidity Density of Charged Particles in p plus Pb Collisions at root s(NN)=5.02 TeV
- Publication venue
- Publication date
- 01/01/2013
- Field of study
The charged-particle pseudorapidity density measured over four units of
pseudorapidity in nonsingle-diffractive p + Pb collisions at a
center-of-mass energy per nucleon pair root s(NN) = 5.02 TeV is
presented. The average value at midrapidity is measured to be 16.81 +/-
0.71 (syst), which corresponds to 2.14 +/- 0.17 (syst) per participating
nucleon, calculated with the Glauber model. This is 16% lower than in
nonsingle-diffractive pp collisions interpolated to the same collision
energy and 84% higher than in d + Au collisions at root s(NN) = 0.2
TeV. The measured pseudorapidity density in p + Pb collisions is
compared to model predictions and provides new constraints on the
description of particle production in high-energy nuclear collisions.
DOI: 10.1103/PhysRevLett.110.03230
Measurement of inelastic, single- and double-diffraction cross sections in proton-proton collisions at the LHC with ALICE
- Publication venue
- Publication date
- 01/01/2013
- Field of study
Measurements of cross sections of inelastic and diffractive processes in
proton-proton collisions at LHC energies were carried out with the ALICE
detector. The fractions of diffractive processes in inelastic collisions
were determined from a study of gaps in charged particle pseudorapidity
distributions: for single diffraction (diffractive mass M-X < 200
GeV/c(2)) sigma(SD)/sigma(INEL) = 0.21 +/- 0.03, 0.20(-0.08)(+0.07,) and
0.20(-0.07)(+0.04), respectively at centre-of-mass energies root s =
0.9, 2.76, and 7 TeV; for double diffraction (for a pseudorapidity gap
Delta eta > 3) sigma(DD)/sigma(INEL) = 0.11 +/- 0.03, 0.12 +/- 0.05, and
0.12(-0.04)(+0.05), respectively at root s = 0.9, 2.76, and 7 TeV. To
measure the inelastic cross section, beam properties were determined
with van der Meer scans, and, using a simulation of diffraction adjusted
to data, the following values were obtained: sigma(INEL) =
62.8(-4.0)(+2.4)(model) +/- 1.2(lumi) mb at root s = 2.76 TeV and
73.2(-4.6)(+2.0)(model) +/- 2.6(lumi) mb at root s = 7 TeV. The single-
and double-diffractive cross sections were calculated combining relative
rates of diffraction with inelastic cross sections. The results are
compared to previous measurements at proton-antiproton and proton-proton
colliders at lower energies, to measurements by other experiments at the
LHC, and to theoretical models
Centrality dependence of pi, K, and p production in Pb-Pb collisions at root s(NN)=2.76 TeV
- Publication venue
- Publication date
- 01/01/2013
- Field of study
In this paper measurements are presented of pi(+/-), K-+/-, p, and (p)
over bar production at midrapidity (vertical bar y vertical bar < 0.5),
in Pb-Pb collisions at root s(NN) = 2.76 TeV as a function of
centrality. The measurement covers the transverse-momentum (p(T)) range
from 100, 200, and 300 MeV/c up to 3, 3, and 4.6 GeV/c for pi, K, and p,
respectively. The measured p(T) distributions and yields are compared to
expectations based on hydrodynamic, thermal and recombination models.
The spectral shapes of central collisions show a stronger radial flow
than measured at lower energies, which can be described in hydrodynamic
models. In peripheral collisions, the p(T) distributions are not well
reproduced by hydrodynamic models. Ratios of integrated particle yields
are found to be nearly independent of centrality. The yield of protons
normalized to pions is a factor similar to 1.5 lower than the
expectation from thermal models
Transverse Momentum Distribution and Nuclear Modification Factor of Charged Particles in p plus Pb Collisions at root(NN)-N-s=5.02 TeV
- Publication venue
- Publication date
- 01/01/2013
- Field of study
The transverse momentum (pT) distribution of primary charged particles
is measured in minimum bias (non-single-diffractive) p + Pb collisions
at root(NN)-N-s = 5.02 TeV with the ALICE detector at the LHC. The pT
spectra measured near central rapidity in the range 0.5< p(T) < 20 GeV/c
exhibit a weak pseudorapidity dependence. The nuclear modification
factor R-pPb is consistent with unity for p(T) above 2 GeV/c. This
measurement indicates that the strong suppression of hadron production
at high p(T) observed in Pb + Pb collisions at the LHC is not due to an
initial-state effect. The measurement is compared to theoretical
calculations. DOI: 10.1103/PhysRevLett.110.08230
Pseudorapidity Density of Charged Particles in p plus Pb Collisions at root s(NN)=5.02 TeV
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- Adam J.
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- Publication venue
- 'American Physical Society (APS)'
- Publication date
- 01/01/2013
- Field of study
The charged-particle pseudorapidity density measured over four units of pseudorapidity in nonsingle-diffractive p + Pb collisions at a center-of-mass energy per nucleon pair root s(NN) = 5.02 TeV is presented. The average value at midrapidity is measured to be 16.81 +/- 0.71 (syst), which corresponds to 2.14 +/- 0.17 (syst) per participating nucleon, calculated with the Glauber model. This is 16% lower than in nonsingle-diffractive pp collisions interpolated to the same collision energy and 84% higher than in d + Au collisions at root s(NN) = 0.2 TeV. The measured pseudorapidity density in p + Pb collisions is compared to model predictions and provides new constraints on the description of particle production in high-energy nuclear collisions. DOI: 10.1103/PhysRevLett.110.03230