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59 papers found.
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Searches for transverse momentum dependent flow vector fluctuations in Pb-Pb and p-Pb collisions at the LHC

The measurement of azimuthal correlations of charged particles is presented for Pb-Pb collisions at \( \sqrt{s_{\mathrm{NN}}}=2.76 \) TeV and p-Pb collisions at \( \sqrt{s_{\mathrm{NN}}}=5.02 \) TeV with the ALICE detector at the CERN Large Hadron Collider. These correlations are measured for the second, third and fourth order flow vector in the pseudorapidity region |η| < 0.8 as a ...

Measurement of D-meson production at mid-rapidity in pp collisions at \({\sqrt{s}=7}\) TeV

The production cross sections for prompt charmed mesons \(\mathrm{D^0}\), \(\mathrm{D^+}\), \(\mathrm{D^{*+}}\) and \(\mathrm{D_s^+}\) were measured at mid-rapidity in proton–proton collisions at a centre-of-mass energy \(\sqrt{s}=7~{\mathrm {TeV}}\) with the ALICE detector at the Large Hadron Collider (LHC). D mesons were reconstructed from their decays \(\mathrm{D}^0 \rightarrow ...

Insight into particle production mechanisms via angular correlations of identified particles in pp collisions at \(\sqrt{\mathrm{s}}=7\) TeV

Two-particle angular correlations were measured in pp collisions at \(\sqrt{s} = 7\) TeV for pions, kaons, protons, and lambdas, for all particle/anti-particle combinations in the pair. Data for mesons exhibit an expected peak dominated by effects associated with mini-jets and are well reproduced by general purpose Monte Carlo generators. However, for baryon–baryon and ...

Measurement of electrons from beauty-hadron decays in p-Pb collisions at \( \sqrt{s_{\mathrm{NN}}}=5.02 \) TeV and Pb-Pb collisions at \( \sqrt{s_{\mathrm{NN}}}=2.76 \) TeV

The production of beauty hadrons was measured via semi-leptonic decays at mid-rapidity with the ALICE detector at the LHC in the transverse momentum interval 1<p T < 8 GeV/c in minimum-bias p-Pb collisions at \( \sqrt{s_{\mathrm{NN}}}=5.02 \) TeV and in 1.3 < p T < 8 GeV/c in the 20% most central Pb-Pb collisions at \( \sqrt{s_{\mathrm{NN}}}=2.76 \) TeV. The pp reference spectra at ...

Energy dependence of forward-rapidity \(\mathrm {J}/\psi \) and \(\psi \mathrm {(2S)}\) production in pp collisions at the LHC

We present results on transverse momentum (\(p_{\mathrm {\textsc {t}}}\)) and rapidity (\(y\)) differential production cross sections, mean transverse momentum and mean transverse momentum square of inclusive \(\mathrm {J}/\psi \) and \(\psi \mathrm {(2S)}\) at forward rapidity (\(2.515\) GeV/c the non-prompt contribution reaches up to 50% of the total charmonium yield.

Production of \({\Sigma (1385)^{\pm }}\) and \({\Xi (1530)^{0}}\) in p–Pb collisions at \({\sqrt{s_{\mathrm{NN}}}= 5.02}\) TeV

The transverse momentum distributions of the strange and double-strange hyperon resonances (\(\Sigma (1385)^{\pm }\), \(\Xi (1530)^{0}\)) produced in p–Pb collisions at \(\sqrt{s_{\mathrm{NN}}}= 5.02\) TeV were measured in the rapidity range \(-0.5< y_\mathrm {CMS}<0\) for event classes corresponding to different charged-particle multiplicity densities, \(\langle ...

Addendum to: Centrality dependence of high-pT D-meson suppression in Pb-Pb collisions at \( \sqrt{{\mathrm{s}}_{\mathrm{NN}}}=2.76 \) TeV

This is an addendum to the article JHEP 11 (2015) 205 [1]. The figures 3 (right), 4 (right) and 5 are updated with published results on non-prompt J/ψ-meson production from the CMS collaboration [2].

Production of \({\pi ^0}\) and \(\eta \) mesons up to high transverse momentum in pp collisions at 2.76 TeV

The invariant differential cross sections for inclusive \(\pi ^{0}\) and \(\eta \) mesons at midrapidity were measured in pp collisions at \(\sqrt{s}=2.76\) TeV for transverse momenta \(0.4<p_{\mathrm {T}}<40\) GeV/c and \(0.6<p_{\mathrm {T}}<20\) GeV/c, respectively, using the ALICE detector. This large range in \(p_{\mathrm {T}}\) was achieved by combining various analysis ...

J/ψ production and nuclear effects in p-Pb collisions at \( \sqrt{{{{\mathrm{s}}_{\mathrm{NN}}}}} \) = 5.02 TeV

Inclusive J/ψ production has been studied with the ALICE detector in p-Pb collisions at the nucleon-nucleon center of mass energy \( \sqrt{{{s_{\mathrm{NN}}}}} \) = 5.02 TeV at the CERN LHC. The measurement is performed in the center of mass rapidity domains 2.03 cms 3.53 and −4.46 cms −2.96, down to zero transverse momentum, studying the μ + μ − decay mode. In this paper, the J/ψ ...

Charmonium and e + e − pair photoproduction at mid-rapidity in ultra-peripheral Pb–Pb collisions at \(\sqrt{s_{\mathrm{NN}}} = 2.76\ \mbox{TeV}\)

The ALICE Collaboration at the LHC has measured the J/ψ and ψ′ photoproduction at mid-rapidity in ultra-peripheral Pb–Pb collisions at \(\sqrt{s_{\mathrm{NN}}}=2.76~\mathrm{TeV}\) . The charmonium is identified via its leptonic decay for events where the hadronic activity is required to be minimal. The analysis is based on an event sample corresponding to an integrated luminosity ...

Measurement of azimuthal correlations of D mesons with charged particles in pp collisions at \(\sqrt{s}=7\) TeV and p–Pb collisions at \({\sqrt{{{s}}_{\scriptscriptstyle {\mathrm{NN}}}}}=5.02\) TeV

The azimuthal correlations of D mesons with charged particles were measured with the ALICE apparatus in pp collisions at \({\sqrt{s}}=7~\mathrm {TeV}\) and p–Pb collisions at \({\sqrt{{{s}}_{\scriptscriptstyle {\mathrm{NN}}}}}=5.02~\mathrm {TeV}\) at the Large Hadron Collider. \(\mathrm{D}^{0}\), \({\mathrm{D}^{+}}\), and \({\mathrm{D}^{*+}}\) mesons and their charge conjugates ...

Determination of the event collision time with the ALICE detector at the LHC

Particle identification is an important feature of the ALICE detector at the LHC. In particular, for particle identification via the time-of-flight technique, the precise determination of the event collision time represents an important ingredient of the quality of the measurement. In this paper, the different methods used for such a measurement in ALICE by means of the T0 and the ...

W and Z boson production in p-Pb collisions at \( \sqrt{s_{\mathrm{NN}}}=5.02 \) TeV

The W and Z boson production was measured via the muonic decay channel in proton-lead collisions at \( \sqrt{s_{\mathrm{NN}}}=5.02 \) TeV at the Large Hadron Collider with the ALICE detector. The measurement covers backward (−4.46 10 GeV/c are determined. The results are compared to theoretical calculations both with and without including the nuclear modification of the parton ...

Charged-particle multiplicities in proton–proton collisions at \(\sqrt{s} = 0.9\) to 8 TeV

A detailed study of pseudorapidity densities and multiplicity distributions of primary charged particles produced in proton–proton collisions, at \(\sqrt{s} =\) 0.9, 2.36, 2.76, 7 and 8 TeV, in the pseudorapidity range \(|\eta |<2\), was carried out using the ALICE detector. Measurements were obtained for three event classes: inelastic, non-single diffractive and events with at ...

Higher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at \( \sqrt{s_{\mathrm{NN}}}=2.76 \) TeV

The elliptic, triangular, quadrangular and pentagonal anisotropic flow coefficients for π±, K± and \( \mathrm{p}+\overline{\mathrm{p}} \) in Pb-Pb collisions at \( \sqrt{s_{\mathrm{NN}}}=2.76 \) TeV were measured with the ALICE detector at the Large Hadron Collider. The results were obtained with the Scalar Product method, correlating the identified hadrons with reference particles ...

Elliptic flow of electrons from heavy-flavour hadron decays at mid-rapidity in Pb-Pb collisions at \( \sqrt{{\mathrm{s}}_{\mathrm{NN}}}=2.76 \) TeV

The elliptic flow of electrons from heavy-flavour hadron decays at mid-rapidity (|y| < 0.7) is measured in Pb-Pb collisions at \( \sqrt{s_{\mathrm{NN}}}=2.76 \) TeV with ALICE at the LHC. The particle azimuthal distribution with respect to the reaction plane can be parametrized with a Fourier expansion, where the second coefficient (v 2) represents the elliptic flow. The v 2 ...

Measurement of D-meson production versus multiplicity in p-Pb collisions at \( \sqrt{{\mathrm{s}}_{\mathrm{NN}}}=5.02 \) TeV

The measurement of prompt D-meson production as a function of multiplicity in p-Pb collisions at \( \sqrt{s_{\mathrm{NN}}}=5.02 \) TeV with the ALICE detector at the LHC is reported. D0, D+ and D∗+ mesons are reconstructed via their hadronic decay channels in the centre-of-mass rapidity range −0.96 < y cms < 0.04 and transverse momentum interval 1<p T <24 GeV/c. The multiplicity ...

Centrality dependence of ψ(2S) suppression in p-Pb collisions at \( {\sqrt{s}}_{\mathrm{NN}}=5.02 \) TeV

The inclusive production of the ψ(2S) charmonium state was studied as a function of centrality in p-Pb collisions at the nucleon-nucleon center of mass energy \( {\sqrt{s}}_{\mathrm{NN}}=5.02 \) TeV at the CERN LHC. The measurement was performed with the ALICE detector in the center of mass rapidity ranges −4.46 < y cms < −2.96 and 2.03 < y cms < 3.53, down to zero transverse ...

Production of K \(^{*}\) (892) \(^{0}\) and \(\phi \) (1020) in p–Pb collisions at \(\sqrt{s_{{\text {NN}}}}\) = 5.02 TeV

The production of K\(^{*}\)(892)\(^{0}\) and \(\phi \)(1020) mesons has been measured in p–Pb collisions at \(\sqrt{s_{{\text {NN}}}}\) \(=\) 5.02 TeV. K\(^{*0}\) and \(\phi \) are reconstructed via their decay into charged hadrons with the ALICE detector in the rapidity range \(-0.5 <y <0\). The transverse momentum spectra, measured as a function of the multiplicity, have a ...