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ALICE Preprints

Derniers ajouts:
2021-07-31
04:08
Latest ALICE results on J/$\psi$ photoproduction in ultra-peripheral collisions at the LHC / Herman, T. (Lund U. ; Prague, Tech. U. ; SUNY, Stony Brook)
Ultra-peripheral collisions (UPCs), studied using the ALICE detector, allow us to investigate the low-$x$ behavior of the gluon distribution of the colliding particles. [...]
arXiv:2107.13284.
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2021-07-23
11:02
Measurement of the groomed jet radius and momentum splitting fraction in pp and Pb$-$Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV / Acharya, Shreyasi (Calcutta, VECC) ; Adamova, Dagmar (Rez, Nucl. Phys. Inst.) ; Adler, Alexander (Goethe U., Frankfurt, Inst. Inform.) ; Aglieri Rinella, Gianluca (CERN) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (INFN, Bologna) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahmad, Shakeel (Aligarh Muslim U.) ; Ahn, Sang Un (KISTI, Daejeon) ; Ahuja, Ishaan (Kosice U.) et al. /ALICE
This article presents groomed jet substructure measurements in pp and Pb$-$Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV with the ALICE detector. The Soft Drop grooming algorithm provides access to the hard parton splittings inside a jet by removing soft wide-angle radiation. [...]
arXiv:2107.12984; CERN-EP-2021-151.- Geneva : CERN, 2021 - 17 p. Draft (restricted): PDF;

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2021-07-21
13:04
Anisotropic flow of identified hadrons in Xe$-$Xe collisions at $\sqrt{s_{\rm NN}} = 5.44$ TeV / Acharya, Shreyasi (Calcutta, VECC) ; Adamova, Dagmar (Rez, Nucl. Phys. Inst.) ; Adler, Alexander (Goethe U., Frankfurt, Inst. Inform.) ; Aglieri Rinella, Gianluca (CERN) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (INFN, Bologna) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahmad, Shakeel (Aligarh Muslim U.) ; Ahn, Sang Un (KISTI, Daejeon) ; Ahuja, Ishaan (Kosice U.) et al. /ALICE
Measurements of elliptic ($v_{2}$) and triangular ($v_{3}$) flow coefficients of $\pi^{\pm}$, K$^{\pm}$, p+$\overline{\rm p}$, K$^{0}_{S}$, and $\Lambda$+$\overline{\Lambda}$ obtained with the scalar product method in Xe$-$Xe collisions at $\sqrt{s_{\rm NN}} = 5.44$ TeV are presented. The results are obtained in the rapidity range |y| < 0.5 and reported as a function of transverse momentum, $p_{\rm T}$, for several collision centrality classes. [...]
arXiv:2107.10592; CERN-EP-2021-149.- Geneva : CERN, 2021 - 32 p. Draft (restricted): PDF;

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2021-07-21
11:45
Polarization of $\Lambda$ and $\overline{\Lambda}$ hyperons along the beam direction in Pb–Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV / Acharya, Shreyasi (Calcutta, VECC) ; Adamova, Dagmar (Rez, Nucl. Phys. Inst.) ; Adler, Alexander (Goethe U., Frankfurt, Inst. Inform.) ; Aglieri Rinella, Gianluca (CERN) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (INFN, Bologna) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahmad, Shakeel (Aligarh Muslim U.) ; Ahn, Sang Un (KISTI, Daejeon) ; Ahuja, Ishaan (Kosice U.) et al.
The polarization of the $\Lambda$ and $\overline{\Lambda}$ hyperons along the beam ($z$) direction, $P_{z}$, has been measured in Pb–Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV recorded with ALICE at the Large Hadron Collider (LHC). The largest contribution to $P_z$ comes from elliptic flow induced vorticity and can be characterized by the second Fourier sine coefficient $P_{z,s2}$ = $⟨P_z sin(2 \varphi − 2 \Psi_2 )⟩$, where $\varphi$ is the hyperon azimuthal emission angle, and $\Psi_2$ is the elliptic flow plane angle. [...]
arXiv:2107.11183; CERN-EP-2021-148.- Geneva : CERN, 2021 - 19 p. Draft (restricted): PDF;

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2021-07-19
10:58
K$^{0}_{\rm S}$- and (anti-)$\Lambda$-hadron correlations in pp collisions at $\sqrt{s} = 13$ TeV / Acharya, Shreyasi (Calcutta, VECC) ; Adamova, Dagmar (Rez, Nucl. Phys. Inst.) ; Adler, Alexander (Goethe U., Frankfurt, Inst. Inform.) ; Aglieri Rinella, Gianluca (CERN) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (INFN, Bologna) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahmad, Shakeel (Aligarh Muslim U.) ; Ahn, Sang Un (KISTI, Daejeon) ; Ahuja, Ishaan (Kosice U.) et al. /ALICE
Two-particle azimuthal correlations are measured with the ALICE apparatus in pp collisions at $\sqrt{s} = 13$ TeV to explore strangeness- and multiplicity-related effects in the fragmentation of jets and the transition regime between bulk and hard production, probed with the condition that a strange meson (K$^{0}_{\rm S}$) or a baryon ($\Lambda$) with transverse momentum $p_{\rm T} > 3$ GeV/c is produced. Azimuthal correlations between kaons or $\Lambda$ hyperons with other hadrons are presented at midrapidity for a broad range of the trigger ($3 < p_{\rm T}^{\rm trigg} < 20$ GeV/$c$) and associated particle $p_{\rm T}$ (1 GeV/$c$ $< p_{\rm T}^{\rm assoc} < p_{\rm T}^{\rm trigg}$), for minimum-bias events and as a function of the event multiplicity. [...]
arXiv:2107.11209; CERN-EP-2021-146.- Geneva : CERN, 2021 - 26 p. Draft (restricted): PDF;

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2021-07-16
18:18
Measurements of the groomed and ungroomed jet angularities in pp collisions at $\sqrt{s} = 5.02$ TeV / ALICE Collaboration
The jet angularities are a class of jet substructure observables which characterize the angular and momentum distribution of particles within jets. These observables are sensitive to momentum scales ranging from perturbative hard scatterings to nonperturbative fragmentation into final-state hadrons. [...]
arXiv:2107.11303; CERN-EP-2021-145.- Geneva : CERN, 2021 - 38 p. Draft (restricted): PDF;

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2021-07-16
18:04
Measurement of very forward energy and particle production at midrapidity in pp and p–Pb collisions at the LHC / Acharya, Shreyasi (Calcutta, VECC) ; Adamova, Dagmar (Rez, Nucl. Phys. Inst.) ; Adler, Alexander (Goethe U., Frankfurt, Inst. Inform.) ; Aglieri Rinella, Gianluca (CERN) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (INFN, Bologna) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahmad, Shakeel (Aligarh Muslim U.) ; Ahn, Sang Un (KISTI, Daejeon) ; Ahuja, Ishaan (Kosice U.) et al. /ALICE
The very forward energy is a powerful tool for characterising the proton fragmentation in pp and p-Pb collisions and, studied in correlation with particle production at midrapidity, provides direct insights into the initial stages and the subsequent evolution of the collision. Furthermore, the correlation between the forward energy and the production of particles with large transverse momenta at midrapidity provides information complementary to the measurements of the underlying event, which are usually interpreted in the framework of models implementing centrality-dependent multiple parton interaction. [...]
arXiv:2107.10757; CERN-EP-2021-144.- Geneva : CERN, 2021 - 23 p. Draft (restricted): PDF;

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2021-07-16
00:22
ALICE ITS upgrade for LHC Run 3: commissioning in the laboratory / Colella, Domenico (Bari Polytechnic ; INFN, Bari)
ALICE is the CERN LHC experiment optimised for the study of the strongly interacting matter produced in heavy-ion collisions and devoted to the characterisation of the quark-gluon plasma. [...]
arXiv:2106.16168.
- 4 p.

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2021-07-14
16:35
Hypertriton production in p–Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV / Acharya, Shreyasi (Calcutta, VECC) ; Adamova, Dagmar (Rez, Nucl. Phys. Inst.) ; Adler, Alexander (Goethe U., Frankfurt, Inst. Inform.) ; Aglieri Rinella, Gianluca (CERN) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (INFN, Bologna) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahmad, Shakeel (Aligarh Muslim U.) ; Ahn, Sang Un (KISTI, Daejeon) ; Ahuja, Ishaan (Kosice U.) et al.
The study of nuclei and antinuclei production has proven to be a powerful tool to investigate the formation mechanism of loosely bound states in high-energy hadronic collisions. The first measurement of the production of $^{3}_{\Lambda}H$ in p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV is presented in this Letter. [...]
arXiv:2107.10627; CERN-EP-2021-139.- Geneva : CERN, 2021 - 18 p. Draft (restricted): PDF;

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2021-06-09
06:17
Anomaly Detection for CERN Beam Transfer Installations Using Machine Learning / Dewitte, Thiebout (Leuven U.) ; Meert, Wannes (Leuven U.) ; Van Trappen, Pieter (CERN) ; Van Wolputte, Elia (Leuven U.)
Reliability, availability and maintainability determine whether or not a large-scale accelerator system can be operated in a sustainable, cost-effective manner. [...]
2019. - 5 p.

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