CERN Accelerating science

ALICE Preprints

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2022-04-16
04:07
Using Machine Learning for Particle Identification in ALICE / Graczykowski, Łukasz Kamil (Warsaw U. of Tech.) ; Jakubowska, Monika (Warsaw U. of Tech.) ; Deja, Kamil Rafał (Warsaw U. of Tech.) ; Kabus, Maja (Warsaw U. of Tech.)
Particle identification (PID) is one of the main strengths of the ALICE experiment at the LHC. [...]
arXiv:2204.06900.
- 12 p.
Fulltext

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2022-04-07
12:44
Heavy flavour collectivity in small systems / Krintiras, Georgios (Kansas U.) /ALICE, ATLAS and CMS Collaborations
The presence of correlations between particles significantly separated in pseudorapidity in proton-proton and proton-nucleus collisions revealed surprises in the early LHC data. Are the physical processes responsible for the observed long-range pseudorapidity correlations and their azimuthal structure the same in small collision systems as in heavy ion collisions? Whereas in the case of heavy ion collisions ``flow'' is interpreted as generated by initial geometric inhomogeneities, calculations indicate that initial-state momentum correlations are present and could contribute to the observed azimuthal anisotropy in small systems [...]
CMS-CR-2021-128.- Geneva : CERN, 2021 - 8 p. Fulltext: PDF;
In : 9th Annual Large Hadron Collider Physics (LHCP 2021), Online, GB, 7 - 12 Jun 2021

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2022-03-30
10:00
${\rm W^\pm}$-boson production in p–Pb collisions at $\sqrt{s_{\rm NN}} = 8.16$ TeV and Pb–Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV / ALICE Collaboration, CERN /ALICE
The production of the ${\rm W^\pm}$ bosons measured in p–Pb collisions at a centre-of-mass energy per nucleon–nucleon collision $\sqrt{s_{\rm NN}} = 8.16$ TeV and Pb–Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV with ALICE at the LHC is presented. The ${\rm W^\pm}$ bosons are measured via their muonic decay channel, with the muon reconstructed in the pseudorapidity region $-4 < \eta_{\rm lab} < -2.5$ with transverse momentum $p_{\rm T}> 10$ GeV/$c$. [...]
arXiv:2204.10640; CERN-EP-2022-076.- Geneva : CERN, 2022 - 30 p. Draft (restricted): PDF; Fulltext: PDF;

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2022-03-28
16:46
ALICE luminosity determination for Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}} = 5.02$ TeV / ALICE Collaboration, CERN /ALICE Collaboration
Luminosity determination within the ALICE experiment is based on the measurement, in van der Meer scans, of the cross sections for visible processes involving one or more detectors (visible cross sections). In 2015 and 2018, the Large Hadron Collider provided Pb$-$Pb collisions at a centre-of-mass energy per nucleon pair of $\sqrt{s_{\rm NN}} = 5.02$ TeV. [...]
arXiv:2204.10148; CERN-EP-2022-072.- 2022 - 17 p. Draft (restricted): PDF; Fulltext: PDF;

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2022-03-28
11:52
Photoproduction of low-$p_{\rm T}$ J/$\psi$ from peripheral to central Pb$-$Pb collisions at 5.02 TeV / ALICE Collaboration, CERN /ALICE Collaboration
An excess of J/$\psi$ yield at very low transverse momentum ($p_{\rm T} < 0.3$ GeV/$c$), originating from coherent photoproduction, is observed in peripheral and semicentral hadronic Pb$-$Pb collisions at a center-of-mass energy per nucleon pair of $\sqrt{s_{\rm NN}} = 5.02$ TeV. The measurement is performed with the ALICE detector via the dimuon decay channel at forward rapidity ($2.5<y<4$). [...]
arXiv:2204.10684; CERN-EP-2022-071.- 2022 - 15 p. Draft (restricted): PDF; Fulltext: PDF;

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2022-03-28
11:02
Measurement of the production of charm jets tagged with ${\rm D^0}$ mesons in pp collisions at $\sqrt{s}$ = 5.02 and 13 TeV / ALICE Collaboration, CERN /ALICE Collaboration
The measurement of the production of charm jets, identified by the presence of a ${\rm D^0}$ meson in the jet constituents, is presented in proton–proton collisions at centre-of-mass energies of $\sqrt{s}$ = 5.02 and 13 TeV with the ALICE detector at the CERN LHC. The D0 mesons were reconstructed from their hadronic decay ${\rm D^0} \rightarrow {\rm K^-}\pi^+$ and the respective charge conjugate. [...]
arXiv:2204.10167; CERN-EP-2022-070.- 2022 - 26 p. Draft (restricted): PDF; Fulltext: PDF;

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2022-03-24
16:52
Dielectron production at midrapidity at low transverse momentum in peripheral and semi-peripheral Pb$-$Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV / ALICE Collaboration, CERN
The first measurement of the ${\rm e}^{+}{\rm e}^{-}$ pair production at low lepton pair transverse momentum ($p_{\rm T,ee}$) and low invariant mass ($m_{\rm ee}$) in non-central Pb$-$Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV at the LHC is presented. The dielectron production is studied with the ALICE detector at midrapidity ($|\eta_{\rm e}| < 0.8$) as a function of invariant mass ($0.4 \leq m_{\rm ee} < 2.7$ GeV/$c^2$) in the 50$-$70% and 70$-$90% centrality classes for $p_{\rm T,ee} < 0.1$ GeV/$c$, and as a function of $p_{\rm T,ee}$ in three $m_{\rm ee}$ intervals in the most peripheral Pb$-$Pb collisions. [...]
arXiv:2204.11732; CERN-EP-2022-068.- Geneva : CERN, 2022 - 19 p. Draft (restricted): PDF; Fulltext: PDF;

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2022-03-24
14:45
Multiplicity and rapidity dependence of ${\rm K}^*(892)^0$ and $\phi(1020)$ production in p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV / ALICE Collaboration, CERN /ALICE Collaboration
The transverse-momentum ($p_{\rm T}$) spectra of ${\rm K}^*(892)^0$ and $\phi(1020)$ measured with the ALICE detector up to $p_{\rm T}$ = 16 GeV/$c$ in the rapidity range $-1.2 < y < 0.3$, in p–Pb collisions at center-of-mass energy per nucleon–nucleon collision $\sqrt{s_{\rm NN}}$ = 5.02 TeV are presented as a function of charged particle multiplicity and rapidity. The measured $p_{\rm T}$ distributions show a dependence on both multiplicity and rapidity at low $p_{\rm T}$ whereas no significant dependence is observed at high $p_{\rm T}$. [...]
arXiv:2204.10263; CERN-EP-2022-067.- 2022 - 19 p. Draft (restricted): PDF; Fulltext: PDF;

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2022-03-24
11:51
Measurement of the J/$\psi$ polarization with respect to the event plane in Pb-Pb collisions at the LHC /ALICE Collaboration
The polarization of inclusive J/$\psi$ produced in Pb$-$Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV at the LHC was studied by ALICE in the dimuon channel, via the measurement of the angular distribution of its decay products. The study was performed in the rapidity region $2.5<y<4$, for three transverse momentum intervals ($2<p_{\rm T}<4$, $4<p_{\rm T}<6$, $6<p_{\rm T}<10$ GeV/$c$) and as a function of the centrality of the collision for $2<p_{\rm T}<6$ GeV/c. [...]
arXiv:2204.10171; CERN-EP-2022-066.- 2022 - 10 p. Draft (restricted): PDF; Fulltext: PDF;

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2022-03-24
11:22
Measurement of beauty-strange meson production in Pb$-$Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV via non-prompt ${\rm D}^{+}_{\rm s}$ mesons / ALICE Collaboration, CERN
The production yields of non-prompt $\mathrm{D_s}^{+}$ mesons, namely $\mathrm{D_s}^{+}$ mesons from beauty-hadron decays, were measured for the first time as a function of the transverse momentum ($p_{\rm T}$) at midrapidity ($|y|<0.5$) in central and semi-central Pb$-$Pb collisions at a centre-of-mass energy per nucleon pair $\sqrt{s_{\rm NN}}=5.02$ TeV with the ALICE experiment at the LHC. The $\mathrm{D_s}^{+}$ mesons and their charge conjugates were reconstructed from the hadronic decay channel $\mathrm{D_s}^{+} \to \phi\pi^{+}$, with $\phi \to {\rm K}^-{\rm K}^{+}$, in the $4 < p_{\rm T}<36$ GeV/$c$ and $2 < p_{\rm T} < 24$ GeV/$c$ intervals for the 0--10\% and 30--50\% centrality classes, respectively. [...]
arXiv:2204.10386; CERN-EP-2022-065.- Geneva : CERN, 2022 - 17 p. Draft (restricted): PDF; Fulltext: PDF;

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