CERN Accelerating science

ALICE Papers

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2018-09-18
17:10
Event-shape engineering for the D-meson elliptic flow in mid-central Pb-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV / ALICE Collaboration, CERN /ALICE
The production yield of prompt D mesons and their elliptic flow coefficient $v_2$ were measured with the Event-Shape Engineering (ESE) technique applied to mid-central (10–30% and 30–50% centrality classes) Pb-Pb collisions at the centre-of-mass energy per nucleon pair $\sqrt{s_{\rm NN}}=5.02$ TeV, with the ALICE detector at the LHC. The ESE technique allows the classification of events, belonging to the same centrality, according to the azimuthal anisotropy of soft particle production in the collision. [...]
CERN-EP-2018-260.- Geneva : CERN, 2018 - 24. Draft (restricted): PDF;

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2018-08-27
09:49
Energy dependence of exclusive $J/\psi$ photoproduction off protons in ultra-peripheral p-Pb collisions at $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV / Acharya, Shreyasi (Calcutta, VECC) ; Torales - Acosta, Fernando (UC, Berkeley) ; Adamova, Dagmar (Rez, Nucl. Phys. Inst.) ; Adler, Alexander (Goethe U., Frankfurt, Inst. Inform.) ; Adolfsson, Jonatan (Lund U.) ; Aggarwal, Madan Mohan (Panjab U.) ; Aglieri Rinella, Gianluca (CERN) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Indian Inst. Tech., Mumbai) ; Ahammed, Zubayer (Calcutta, VECC) et al. /ALICE
The ALICE Collaboration has measured the energy dependence of exclusive photoproduction of $J/\psi$ vector mesons off proton targets in ultra–peripheral p-Pb collisions at a centre-of-mass energy per nucleon pair $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV. The $e^{+}e^{-}$ and $\mu^{+}\mu^{-}$ decay channels are used to measure the cross section as a function of the rapidity of the $J/\psi$ in the range −2.5 < $y$ < 2.7, corresponding to an energy in the $\gamma p$ centre-of-mass in the interval 40 < $W_{\gamma p}$ < 550 GeV. [...]
arXiv:1809.03235; CERN-EP-2018-236.- Geneva : CERN, 2018 - 24 p. Draft (restricted): PDF; Fulltext: PDF;

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2018-08-27
09:41
Charged jet cross section and fragmentation in proton-proton collisions at $\sqrt{s}$ = 7 TeV / Acharya, Shreyasi (Calcutta, VECC) ; Torales - Acosta, Fernando (UC, Berkeley) ; Adamova, Dagmar (Rez, Nucl. Phys. Inst.) ; Adler, Alexander (Goethe U., Frankfurt, Inst. Inform.) ; Adolfsson, Jonatan (Lund U.) ; Aggarwal, Madan Mohan (Panjab U.) ; Aglieri Rinella, Gianluca (CERN) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Indian Inst. Tech., Mumbai) ; Ahammed, Zubayer (Calcutta, VECC) et al.
We report the differential charged jet cross section and jet fragmentation distributions measured with the ALICE detector in proton-proton collisions at a centre-of-mass energy $\sqrt{s}$ = 7 TeV. Jets with pseudo-rapidity $|\eta|<0.5$ are reconstructed from charged particles using the anti-$k_{T}$ jet finding algorithm with a resolution parameter $R$ = 0.4. [...]
arXiv:1809.03232; CERN-EP-2018-235.- Geneva : CERN, 2018 - 23 p. Draft (restricted): PDF; Fulltext: PDF;

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2018-08-27
09:28
Measuring $\rm{K}^{0}\rm{K}^{\pm}$ interactions using pp collisions at $\sqrt{s}$ = 7 TeV / Acharya, Shreyasi (Calcutta, VECC) ; Torales - Acosta, Fernando (UC, Berkeley) ; Adamova, Dagmar (Rez, Nucl. Phys. Inst.) ; Adler, Alexander (Goethe U., Frankfurt, Inst. Inform.) ; Adolfsson, Jonatan (Lund U.) ; Aggarwal, Madan Mohan (Panjab U.) ; Aglieri Rinella, Gianluca (CERN) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Indian Inst. Tech., Mumbai) ; Ahammed, Zubayer (Calcutta, VECC) et al. /ALICE
We present the first measurements of femtoscopic correlations between the $\rm{K}^{0}$ and $\rm{K}^{\pm}$ particles in pp collisions at $\sqrt{s}$ = 7 TeV measured by the ALICE experiment. The observed femtoscopic correlations are consistent with final-state interactions proceeding solely via the $a_{0}(980)$ resonance. [...]
arXiv:1809.07899; CERN-EP-2018-234.- Geneva : CERN, 2018 - 21 p. Draft (restricted): PDF; Fulltext: PDF;

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2018-07-23
10:29
Multiplicity dependence of light-flavor hadron production in pp collisions at $\sqrt{s}$ = 7 TeV / Acharya, Shreyasi (Calcutta, VECC) ; Torales - Acosta, Fernando (UC, Berkeley) ; Adamova, Dagmar (Rez, Nucl. Phys. Inst.) ; Adler, Alexander (Goethe U., Frankfurt, Inst. Inform.) ; Adolfsson, Jonatan (Lund U.) ; Aggarwal, Madan Mohan (Panjab U.) ; Aglieri Rinella, Gianluca (CERN) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Indian Inst. Tech., Mumbai) ; Ahammed, Zubayer (Calcutta, VECC) et al. /ALICE
Comprehensive results on the production of unidentified charged particles, $\pi^{+}$, $\rm{K}^{\pm}$, $\rm{K}^{0}_{S}$, K*(892)$^{0}$, $\rm{p}$, $\overline{\rm{p}}$, $\phi$(1020), $\Lambda$, $\overline{\Lambda}$, $\Xi^{-}$, $\overline{\Xi}^{+}$, $\Omega^{-}$ and $\overline{\Omega}^{+}$ hadrons in proton-proton (pp) collisions at $\sqrt{s}$ = 7 TeV at midrapidity ($|y| < 0.5$) as a function of charged-particle multiplicity density are presented. In order to avoid auto-correlation biases, the actual transverse momentum ($p_{\rm{T}}$) spectra of the particles under study and the event activity are measured in different rapidity windows [...]
arXiv:1807.11321; CERN-EP-2018-209.- Geneva : CERN, 2018 - 45 p. Draft (restricted): PDF; Fulltext: PDF;

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2018-07-12
04:24
Medium modification of the shape of small-radius jets in central Pb-Pb collisions at $\sqrt{s_{\rm{NN}}}$ = 2.76 TeV / Acharya, Shreyasi (Calcutta, VECC) ; Torales - Acosta, Fernando (UC, Berkeley) ; Adamova, Dagmar (Rez, Nucl. Phys. Inst.) ; Adler, Alexander (Goethe U., Frankfurt, Inst. Inform.) ; Adolfsson, Jonatan (Lund U.) ; Aggarwal, Madan Mohan (Panjab U.) ; Aglieri Rinella, Gianluca (CERN) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Indian Inst. Tech., Mumbai) ; Ahammed, Zubayer (Calcutta, VECC) et al.
We present the measurement of a new set of jet shape observables for track-based jets in central Pb-Pb collisions at $\sqrt{s_{\rm{NN}}}$ = 2.76 TeV. The set of jet shapes includes the first radial moment or angularity, $g$; the momentum dispersion, $p_{\rm{T}}D$; and the difference between the leading and sub-leading constituent track transverse momentum, $LeSub$. [...]
arXiv:1807.06854; CERN-EP-2018-201.- Geneva : CERN, 2018 - 26 p. Draft (restricted): PDF; Fulltext: PDF; Preprint: PDF;

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2018-06-21
03:38
Measurement of dielectron production in central Pb-Pb collisions at $\sqrt{{\textit{s}}_{\mathrm{NN}}}$ = 2.76 TeV / Acharya, Shreyasi (Calcutta, VECC) ; Torales - Acosta, Fernando (UC, Berkeley) ; Adamova, Dagmar (Rez, Nucl. Phys. Inst.) ; Adolfsson, Jonatan (Lund U.) ; Aggarwal, Madan Mohan (Panjab U.) ; Aglieri Rinella, Gianluca (CERN) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Indian Inst. Tech., Mumbai) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahn, Sang Un (KISTI, Daejeon) et al.
The first measurement of dielectron ($\mathrm{e}^{+}\mathrm{e}^{-}$) production in central (0$-$10$\%$) Pb--Pb collisions at a center-of-mass energy per nucleon pair $\mathbf{\sqrt{{\textit{s}}_{\mathrm{NN}}}}$ = 2.76 TeV at the LHC is presented. The dielectron invariant-mass spectrum is measured in the ALICE central barrel detectors for electrons with pseudorapidity $|\eta_{\mathrm{e}}|<0.8$ and transverse momentum $0.4 < p_{\mathrm{T}, \mathrm{e}} < 5$ GeV/$\textit{c}$ [...]
CERN-EP-2018-181; arXiv:1807.00923.- Geneva : CERN, 2018 - 34 p. Draft (restricted): PDF; Fulltext: PDF;

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2018-05-29
00:48
p-p, p-$\Lambda$ and $\Lambda$-$\Lambda$ correlations studied via femtoscopy in pp reactions at $\sqrt{s}$ = 7 TeV / Acharya, Shreyasi (Calcutta, VECC) ; Torales - Acosta, Fernando (UC, Berkeley) ; Adamova, Dagmar (Rez, Nucl. Phys. Inst.) ; Adolfsson, Jonatan (Lund U.) ; Aggarwal, Madan Mohan (Panjab U.) ; Aglieri Rinella, Gianluca (CERN) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Indian Inst. Tech., Mumbai) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahn, Sang Un (KISTI, Daejeon) et al.
We report on the first femtoscopic measurement of baryon pairs, such as p-p, p-$\Lambda$ and $\Lambda$-$\Lambda$, measured by ALICE at the Large Hadron Collider (LHC) in proton-proton collisions at $\sqrt{s}$ = 7 TeV This study demonstrates the feasibility of such measurements in pp collisions at ultrarelativistic energies. The femtoscopy method is employed to constrain the hyperon-nucleon and hyperon-hyperon interactions, which are still rather poorly understood. [...]
CERN-EP-2018-150; arXiv:1805.12455.- Geneva : CERN, 2018 - 32 p. Draft (restricted): PDF; Fulltext: PDF;

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2018-05-08
14:59
Dielectron and heavy-quark production in inelastic and high-multiplicity proton-proton collisions at $\sqrt{s} = 13$ TeV / Acharya, Shreyasi (Calcutta, VECC) ; Torales - Acosta, Fernando (UC, Berkeley) ; Adamova, Dagmar (Rez, Nucl. Phys. Inst.) ; Adolfsson, Jonatan (Lund U.) ; Aggarwal, Madan Mohan (Panjab U.) ; Aglieri Rinella, Gianluca (CERN) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Indian Inst. Tech., Mumbai) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahn, Sang Un (KISTI, Daejeon) et al. /ALICE
The measurement of electron-positron pair production is presented as a function of their invariant mass and transverse momentum at midrapidity ($|y_{\rm e} | < 0.8$) in proton-proton (pp) collisions at a centre-of-mass energy of $\sqrt{s} = 13$ TeV. The contributions from light-hadron decays can be calculated from their measured cross sections in pp collisions at $\sqrt{s} = 7$ TeV or $13$ TeV. [...]
CERN-EP-2018-122; arXiv:1805.04407.- Geneva : CERN, 2018 - 23 p. Draft (restricted): PDF; Fulltext: PDF;

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2018-05-08
04:03
Centrality and pseudorapidity dependence of the charged-particle multiplicity density in Xe–Xe collisions at $\sqrt{s_{NN}}$ = 5.44 TeV / Acharya, Shreyasi (Calcutta, VECC) ; Torales - Acosta, Fernando (UC, Berkeley) ; Adamova, Dagmar (Rez, Nucl. Phys. Inst.) ; Adolfsson, Jonatan (Lund U.) ; Aggarwal, Madan Mohan (Panjab U.) ; Aglieri Rinella, Gianluca (CERN) ; Agnello, Michelangelo (Turin Polytechnic) ; Agrawal, Neelima (Indian Inst. Tech., Mumbai) ; Ahammed, Zubayer (Calcutta, VECC) ; Ahn, Sang Un (KISTI, Daejeon) et al. /ALICE
In this Letter, the ALICE Collaboration presents the first measurements of the charged-particle multiplicity density, $dN_{ch}/d\eta$, and total charged-particle multiplicity, $N_{ch}^{tot}$, in Xe–Xe collisions at a centre-of-mass energy per nucleon-nucleon pair of $\sqrt{s_{NN}}$ = 5.44 TeV. The measurements are performed as a function of collision centrality over a wide pseudorapidity range of −3.5 < $\eta$ < 5. [...]
CERN-EP-2018-120; arXiv:1805.04432.- Geneva : CERN, 2018 - 24 p. Draft (restricted): PDF; Fulltext: PDF;

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