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169 results on '"Altenkaemper, Lucas"'

151. System-size dependence of the charged-particle pseudorapidity density at sNN=5.02 TeV with ALICE

Author

Acharya, Shreyasi, Adam, Jaroslav, Adamová, Dagmar, Adolfsson, Jonatan, Aggarwal, Madan M., Aglieri Rinella, G, Agnello, Michelangelo, Agrawal, Nikita, Ahammed, Zubayer, Ahmad, N, Ahn, SU, Alme, Johan, Altenkaemper, Lucas, Arsene, Ionut Christian, Bätzing, Paul Christoph, Djuvsland, Øystein, Dordic, Olja, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Langøy, Rune, Lardeux, Antoine Xavier, Lien, Jørgen André, Lindal, Svein, Lønne, Per-Ivar, Mahmood, Sohail Musa, Milosevic, Jovan, Nesbø, Simon Voigt, Nystrand, Joakim, Rehman, Attiq Ur, Richter, Matthias Rudolph, Røed, Ketil, Røhrich, Dieter, Skaali, Toralf Bernhard, Tambave, Ganesh Jagannath, Tveter, Trine Spedstad, Ullaland, Kjetil, Velure, Arild, Wagner, Boris, Wikne, Jon Christopher, Zhang, Hui, Zhao, Chengxin, Zhou, Zhuo, Zhu, Hongsheng, Aiola, Salvatore, Akindinov, Alexander, Alam, Sk Noor, Alba, José Luis Bazo, Aleksandrov, Dimitry, Allesandro, B., and ALICE, Collaboration

Published
2017

152. Investigating the role of coherence effects on jet quenching in Pb-Pb collisions at √sNN = 2.76 TeV using jet substructure

Author

Acharya, Shreyasi, Adam, Jaroslav, Adamová, Dagmar, Adolfsson, Jonatan, Aggarwal, Madan M., Aglieri Rinella, Gianluca, Agnello, Michelangelo, Agrawal, Nikita, Ahammed, Zubayer, Ahmad, N., Ahn, S.U., Aiola, Salvatore, Akindinov, Alexander, Alam, SN, Alba, José Luis Bazo, Albuquerque, D.S.D., Aleksandrov, Dimitry, Alessandro, Bruno, Alfaro Molina, José Rubén, Alici, Andrea, Alkin, A., Alme, Johan, Altenkaemper, Lucas, Arsene, Ionut Christian, Bätzing, Paul Christoph, Djuvsland, Øystein, Dordic, Olja, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Langøy, Rune, Lardeux, Antoine Xavier, Lien, Jørgen André, Lindal, Svein, Lønne, Per-Ivar, Mahmood, Sohail Musa, Milosevic, Jovan, Nesbø, Simon Voigt, Nystrand, Joakim, Rehman, Attiq Ur, Richter, Matthias Rudolph, Røed, Ketil, Røhrich, Dieter, Skaali, Toralf Bernhard, Tambave, Ganesh Jagannath, Tveter, Trine Spedstad, Ullaland, Kjetil, Velure, Arild, Wagner, Boris, Wikne, Jon Christopher, Zhang, Hui, Zhao, Chengxin, Zhou, Zhuo, Zhu, Hongsheng, and ALICE, Collaboration

Subjects
Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Experiment, Matematikk og Naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431 [VDP], Nuclear Experiment
Abstract

We report measurements of two jet shapes, the ratio of 2-Subjettiness to 1-Subjettiness (τ2/τ1) and the opening angle between the two axes of the 2-Subjettiness jet shape, which is obtained by reclustering the jet with the exclusive-kT algorithm [1] and undoing the final clustering step. The aim of this measurement is to explore a possible change in the rate of 2-pronged objects in Pb-Pb compared to pp due to colour coherence. Coherence effects [2] relate to the ability of the medium to resolve a jet’s substructure, which has an impact on the energy loss magnitude and mechanism of the traversing jet. In both collision systems charged jets are found with the anti-kT algorithm [3], a resolution parameter of R =0.4 and a constituent cut off of 0.15 GeV. This analysis uses hadron-jet coincidence techniques in Pb-Pb collisions to reject the combinatorial background and corrects further for background effects by employing various jet shape subtraction techniques and two dimensional unfolding. Measurements of the Nsubjettiness for jet momenta of 40 − 60 GeV/c in Pb-Pb collisions at √sNN = 2.76 TeV and pp collisions at √s = 7 TeV will be presented and compared to PYTHIA simulations.

Published
2017

153. Measurement of J/ψ production as a function of event multiplicity in pp collisions at s=13 TeV with ALICE

Author

Acharya, Shreyasi, Adam, Jaroslav, Adamová, Dagmar, Adolfsson, Jonatan, Aggarwal, Madan M., Aglieri Rinella, G, Agnello, Michelangelo, Agrawal, Nikita, Ahammed, Zubayer, Ahmad, N, Ahn, SU, Alme, Johan, Altenkaemper, Lucas, Arsene, Ionut Christian, Bätzing, Paul Christoph, Djuvsland, Øystein, Dordic, Olja, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Langøy, Rune, Lardeux, Antoine Xavier, Lien, Jørgen André, Lindal, Svein, Lønne, Per-Ivar, Mahmood, Sohail Musa, Milosevic, Jovan, Nesbø, Simon Voigt, Nystrand, Joakim, Rehman, Attiq Ur, Richter, Matthias Rudolph, Røed, Ketil, Røhrich, Dieter, Skaali, Toralf Bernhard, Tambave, Ganesh Jagannath, Tveter, Trine Spedstad, Ullaland, Kjetil, Velure, Arild, Wagner, Boris, Wikne, Jon Christopher, Zhang, Hui, Zhao, Chengxin, Zhou, Zhuo, Zhu, Hongsheng, Aiola, Salvatore, Akindinov, Alexander, Alam, Sk Noor, Alba, José Luis Bazo, Aleksandrov, Dimitry, Allesandro, B., and De Albuquerque, Danilo Silva

Published
2017

154. Measurements of the nuclear modification factor and elliptic flow of leptons from heavy-flavour hadron decays in Pb–Pb collisions at √sNN = 2.76 and 5.02 TeV with ALICE

Author

Acharya, Shreyasi, Adam, Jaroslav, Adamová, Dagmar, Adolfsson, Jonatan, Aggarwal, Madan M., Aglieri Rinella, Gianluca, Agnello, Michelangelo, Agrawal, Nikita, Ahammed, Zubayer, Ahmad, Nazeer, Ahn, Sang Un, Alme, Johan, Altenkaemper, Lucas, Arsene, Ionut Christian, Bätzing, Paul Christoph, Djuvsland, Øystein, Dordic, Olja, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Langøy, Rune, Lardeux, Antoine Xavier, Lien, Jørgen, Lindal, Svein, Lønne, Per-Ivar, Mahmood, Sohail Musa, Milosevic, Jovan, Nesbø, Simon Voigt, Nystrand, Joakim, Rehman, Attiq ur, Richter, Matthias, Røed, Ketil, Røhrich, Dieter, Skaali, Toralf Bernhard, Tambave, Ganesh Jagannath, Tveter, Trine Spedstad, Ullaland, Kjetil, Velure, Arild, Wagner, Boris, Wikne, Jon Christopher, Zhang, Hui, Zhao, Chengxin, Zhou, Zhuo, Zhu, Hongsheng, Aiola, Salvatore, Akindinov, Alexander, Alam, Sk Noor, Alba, José Luis Bazo, Aleksandrov, Dimitry, Allesandro, B., and ALICE, Collaboration

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment, Matematikk og Naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431 [VDP], Nuclear Experiment
Abstract

We present the ALICE results on the nuclear modification factor and elliptic flow of electrons and muons from open heavy-flavour hadron decays at mid-rapidity and forward rapidity in Pb–Pb collisions at √sNN = 2.76 and 5.02 TeV for different centrality intervals. The results are compared to model calculations that include interactions of heavy quarks with the medium.

Published
2017

155. Measurement of deuteron spectra and elliptic flow in Pb-Pb collisions at √sNN = 2.76 TeV at the LHC

Author

Acharya, Shreyasi, Adamová, Dagmar, Adolfsson, Jonatan, Aggarwal, Madan M., Aglieri Rinella, Gianluca, Agnello, Michelangelo, Agrawal, Nikita, Ahammed, Zubayer, Ahmad, Shafiq F., Ahn, Sang Un, Alme, Johan, Altenkaemper, Lucas, Djuvsland, Øystein, Fionda, Fiorella Maria Celeste, Lønne, Per-Ivar, Nystrand, Joakim, Rehman, Attiq ur, Røhrich, Dieter, Tambave, Ganesh Jagannath, Ullaland, Kjetil, Velure, Arild, Wagner, Boris, Zhang, Hui, Zhou, Zhuo, Zhu, Hongsheng, Arsene, Ionut Christian, Bätzing, Paul Christoph, Dordic, Olja, Lardeux, Antoine Xavier, Lindal, Svein, Mahmood, Sohail Musa, Milosevic, Jovan, Richter, Matthias, Røed, Ketil, Skaali, Toralf Bernhard, Tveter, Trine Spedstad, Wikne, Jon Christopher, Zhao, Chengxin, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Nesbø, Simon Voigt, Storetvedt, Maksim Melnik, Langøy, Rune, Lien, Jørgen André, Aiola, Salvatore, Akindinov, Alexander, Alam, Sk Noor, Alba, José Luis Bazo, De Albuquerque, Danilo Silva, and ALICE, Collaboration

Subjects
Kjerne- og elementærpartikkelfysikk: 431 [VDP], Nuclear and elementary particle physics: 431 [VDP], VDP::Nuclear and elementary particle physics: 431, VDP::Kjerne- og elementærpartikkelfysikk: 431, Nuclear Experiment
Abstract

The transverse momentum ( pT ) spectra and elliptic flow coefficient ( v2 ) of deuterons and anti-deuterons at mid-rapidity ( |y| 1.8 GeV /c within the experimental uncertainties. The measurement of the coalescence parameter B2 is performed, showing a pT dependence in contrast with the simplest coalescence model, which fails to reproduce also the measured v2 coefficient. In addition, the coalescence parameter B2 and the elliptic flow coefficient in the 20–40% centrality interval are compared with the AMPT model which is able, in its version without string melting, to reproduce the measured v2 ( pT ) and the B2 ( pT ) trend.

Published
2017

156. Event activity-dependence of jet production in p–Pb collisions at sNN=5.02 TeV measured with semi-inclusive hadron+jet correlations by ALICE

Author

Acharya, Shreyasi, Adam, Jaroslav, Adamová, Dagmar, Adolfsson, Jonatan, Aggarwal, Madan M., Aglieri Rinella, G, Agnello, Michelangelo, Agrawal, Nikita, Ahammed, Zubayer, Ahmad, N, Ahn, SU, Alme, Johan, Altenkaemper, Lucas, Arsene, Ionut Christian, Bätzing, Paul Christoph, Djuvsland, Øystein, Dordic, Olja, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Langøy, Rune, Lardeux, Antoine Xavier, Lien, Jørgen André, Lindal, Svein, Lønne, Per-Ivar, Mahmood, Sohail Musa, Milosevic, Jovan, Nesbø, Simon Voigt, Nystrand, Joakim, Rehman, Attiq Ur, Richter, Matthias Rudolph, Røed, Ketil, Røhrich, Dieter, Skaali, Toralf Bernhard, Tambave, Ganesh Jagannath, Tveter, Trine Spedstad, Ullaland, Kjetil, Velure, Arild, Wagner, Boris, Wikne, Jon Christopher, Zhang, Hui, Zhao, Chengxin, Zhou, Zhuo, Zhu, Hongsheng, Aiola, Salvatore, Akindinov, Alexander, Alam, Sk Noor, Alba, José Luis Bazo, Aleksandrov, Dimitry, Allesandro, B., and ALICE, Collaboration

Published
2017

157. System-size dependence of the charged-particle pseudorapidity density at √sNN=5.02 TeV with ALICE

Author

Acharya, Shreyasi, Adam, Jaroslav, Adamová, Dagmar, Adolfsson, Jonatan, Aggarwal, Madan M., Aglieri Rinella, Gianluca, Agnello, Michelangelo, Agrawal, Nikita, Ahammed, Zubayer, Ahmad, Nazeer, Ahn, Sang Un, Alme, Johan, Altenkaemper, Lucas, Arsene, Ionut Christian, Bätzing, Paul Christoph, Djuvsland, Øystein, Dordic, Olja, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Langøy, Rune, Lardeux, Antoine Xavier, Lien, Jørgen, Lindal, Svein, Lønne, Per-Ivar, Mahmood, Sohail Musa, Milosevic, Jovan, Nesbø, Simon Voigt, Nystrand, Joakim, Rehman, Attiq ur, Richter, Matthias, Røed, Ketil, Røhrich, Dieter, Skaali, Toralf Bernhard, Tambave, Ganesh Jagannath, Tveter, Trine Spedstad, Ullaland, Kjetil, Velure, Arild, Wagner, Boris, Wikne, Jon Christopher, Zhang, Hui, Zhao, Chengxin, Zhou, Zhuo, Zhu, Hongsheng, Aiola, Salvatore, Akindinov, Alexander, Alam, Sk Noor, Alba, José Luis Bazo, Aleksandrov, Dimitry, Allesandro, B., and ALICE, Collaboration

Subjects
Matematikk og Naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431 [VDP], Nuclear Experiment
Abstract

We present the charged-particle pseudorapidity density in pp, p–Pb, and Pb–Pb collisions at √sNN = 5.02 TeV over a broad pseudorapidity range. The distributions are determined using the same experimental apparatus and methodologies, thereby minimizing systematic uncertainties, and providing clear and model-independent observations on the system-size dependence of the particle production at relativistic energies. An increase of particle production in Pb–Pb collisions near mid-rapidity, relative to pp collisions, is observed. The relative linearity in p–Pb collisions of the ratio to the smaller system indicate a coherent particle production throughout the longitudinal extend of the collision zone.

Published
2017

158. Multiplicity dependence of identified particle production in proton-proton collisions with ALICE

Author

Acharya, Shreyasi, Adam, Jaroslav, Adamová, Dagmar, Adolfsson, Jonatan, Aggarwal, Madan M., Aglieri Rinella, G, Agnello, Michelangelo, Agrawal, Nikita, Ahammed, Zubayer, Ahmad, N, Ahn, SU, Alme, Johan, Altenkaemper, Lucas, Arsene, Ionut Christian, Bätzing, Paul Christoph, Djuvsland, Øystein, Dordic, Olja, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Langøy, Rune, Lardeux, Antoine Xavier, Lien, Jørgen André, Lindal, Svein, Lønne, Per-Ivar, Mahmood, Sohail Musa, Milosevic, Jovan, Nesbø, Simon Voigt, Nystrand, Joakim, Rehman, Attiq Ur, Richter, Matthias Rudolph, Røed, Ketil, Røhrich, Dieter, Skaali, Toralf Bernhard, Tambave, Ganesh Jagannath, Tveter, Trine Spedstad, Ullaland, Kjetil, Velure, Arild, Wagner, Boris, Wikne, Jon Christopher, Zhang, Hui, Zhao, Chengxin, Zhou, Zhuo, Zhu, Hongsheng, Aiola, Salvatore, Akindinov, Alexander, Alam, Sk Noor, Alba, José Luis Bazo, Aleksandrov, Dimitry, Allesandro, B., De Albuquerque, Danilo Silva, and ALICE, Collaboration

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, hep-ex, Multiplicity dependence, Monte Carlo method, Hadron, Small systems, Enhancement pattern, 01 natural sciences, Nuclear physics, small systems, 0103 physical sciences, Transverse momentum, Yield ratio, collectivity, Multiplicity (chemistry), Matematikk og Naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431 [VDP], 010306 general physics, Nuclear Experiment, Particle Physics - Experiment
Abstract

The study of identified particle production as a function of transverse momentum ( p T ) and event multiplicity in proton-proton (pp) collisions at different center-of-mass energies ( s ) is a key tool for understanding similarities and differences between small and large collisions systems. We report on the production of π± , K± , KS0 , p(p‾) , Λ(Λ‾) , Ξ± and Ω± measured in pp collisions in a wide range of center-of-mass energies with ALICE [1]. The multiplicity dependence of identified particle yields is presented for s=7 and 13 TeV and discussed in the context of the results obtained in protonlead (p-Pb) and lead-lead (Pb-Pb) collisions, unveiling remarkable and intriguing similarities. The production rates of strange hadrons are observed to increase more than those of non-strange particles, showing an enhancement pattern with multiplicity which does not depend on the collision energy. Even if the multiplicity dependence of spectral shapes can be qualitatively described by commonly-used Monte Carlo (MC) event generators, the evolution of integrated yield ratios is poorly described by these models. The study of identified particle production as a function of transverse momentum ($p_{\text{T}}$) and event multiplicity in proton-proton (pp) collisions at different center-of-mass energies ($\sqrt{s}$) is a key tool for understanding similarities and differences between small and large collisions systems. We report on the production of $\pi^{\pm}$, $K^{\pm}$, $K^{0}_{S}$, $p (\bar{p})$, $\Lambda (\bar{\Lambda})$, $\Xi^{\pm}$ and $\Omega^{\pm}$ measured in pp collisions in a wide range of center-of-mass energies with ALICE. The multiplicity dependence of identified particle yields is presented for $\sqrt{s} = \textrm{7}$ and $13$ TeV and discussed in the context of the results obtained in proton-lead (p-Pb) and lead-lead (Pb-Pb) collisions, unveiling remarkable and intriguing similarities. The production rates of strange hadrons are observed to increase more than those of non-strange particles, showing an enhancement pattern with multiplicity which does not depend on the collision energy. Even if the multiplicity dependence of spectral shapes can be qualitatively described by commonly-used Monte Carlo (MC) event generators, the evolution of integrated yield ratios is poorly described by these models.

Published
2017

159. Measuring K0SK± interactions using Pb–Pb collisions at √sNN=2.76 TeV

Author

Acharya, Shreyasi, Adamová, Dagmar, Adolfsson, Jonatan, Aggarwal, Madan M., Aglieri Rinella, Gianluca, Agnello, Michelangelo, Agrawal, Nikita, Ahammed, Zubayer, Ahmad, Shafiq F., Ahn, Sang Un, Alme, Johan, Altenkaemper, Lucas, Djuvsland, Øystein, Lønne, Per-Ivar, Nystrand, Joakim, Rehman, Attiq ur, Røhrich, Dieter, Tambave, Ganesh Jagannath, Ullaland, Kjetil, Velure, Arild, Wagner, Boris, Zhang, Hui, Zhou, Zhuo, Zhu, Hongsheng, Arsene, Ionut Christian, Bätzing, Paul Christoph, Dordic, Olja, Lardeux, Antoine Xavier, Lindal, Svein, Mahmood, Sohail Musa, Milosevic, Jovan, Richter, Matthias Rudolph, Røed, Ketil, Skaali, Toralf Bernhard, Tveter, Trine Spedstad, Wikne, Jon Christopher, Zhao, Chengxin, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Nesbø, Simon Voigt, Langøy, Rune, Lien, Jørgen André, Aiola, Salvatore, Akindinov, Alexander, Alam, Sk Noor, Alba, José Luis Bazo, De Albuquerque, Danilo Silva, Aleksandrov, Dimitry, Alessandro, Bruno, and ALICE, Collaboration

Subjects
Kjerne- og elementærpartikkelfysikk: 431 [VDP], Nuclear and elementary particle physics: 431 [VDP], VDP::Nuclear and elementary particle physics: 431, VDP::Kjerne- og elementærpartikkelfysikk: 431
Abstract

We present the first ever measurements of femtoscopic correlations between the K0 S and K± particles. The analysis was performed on the data from Pb–Pb collisions at √sNN = 2.76 TeV measured by the ALICE experiment. The observed femtoscopic correlations are consistent with final-state interactions proceeding via the a0(980) resonance. The extracted kaon source radius and correlation strength parameters for K0 SK− are found to be equal within the experimental uncertainties to those for K0 SK+. Comparing the results of the present study with those from published identical-kaon femtoscopic studies by ALICE, mass and coupling parameters for the a0 resonance are tested. Our results are also compatible with the interpretation of the a0 having a tetraquark structure instead of that of a diquark.

Published
2017

160. Linear and non-linear flow mode in Pb–Pb collisions at √sNN=2.76TeV

Author

Acharya, Shreyasi, Adamová, Dagmar, Adolfsson, Jonatan, Aggarwal, Madan M., Aglieri Rinella, Gianluca, Agnello, Michelangelo, Agrawal, Nikita, Ahammed, Zubayer, Ahmad, Shafiq F., Ahn, Sang Un, Alme, Johan, Altenkaemper, Lucas, Djuvsland, Øystein, Lønne, Per-Ivar, Nystrand, Joakim, Rehman, Attiq ur, Røhrich, Dieter, Tambave, Ganesh Jagannath, Ullaland, Kjetil, Velure, Arild, Wagner, Boris, Zhang, Hui, Zhou, Zhuo, Zhu, Hongsheng, Arsene, Ionut Christian, Bätzing, Paul Christoph, Dordic, Olja, Lardeux, Antoine Xavier, Lindal, Svein, Mahmood, Sohail Musa, Milosevic, Jovan, Richter, Matthias, Røed, Ketil, Skaali, Toralf Bernhard, Tveter, Trine Spedstad, Wikne, Jon Christopher, Zhao, Chengxin, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Nesbø, Simon Voigt, Langøy, Rune, Lien, Jørgen André, Aiola, Salvatore, Akindinov, Alexander, Alam, Sk Noor, Alba, José Luis Bazo, De Albuquerque, Danilo Silva, Aleksandrov, Dimitry, Alessandro, Bruno, and ALICE, Collaboration

Subjects
Kjerne- og elementærpartikkelfysikk: 431 [VDP], Nuclear and elementary particle physics: 431 [VDP], VDP::Nuclear and elementary particle physics: 431, VDP::Kjerne- og elementærpartikkelfysikk: 431
Abstract

The second and the third order anisotropic flow, V2and V3, are mostly determined by the corresponding initial spatial anisotropy coefficients, ε2and ε3, in the initial density distribution. In addition to their dependence on the same order initial anisotropy coefficient, higher order anisotropic flow, Vn(n > 3), can also have a significant contribution from lower order initial anisotropy coefficients, which leads to mode-coupling effects. In this Letter we investigate the linear and non-linear modes in higher order anisotropic flow Vnfor n = 4, 5, 6 with the ALICE detector at the Large Hadron Collider. The measurements are done for particles in the pseudorapidity range |η| < 0.8andthe transverse momentum range 0.2 < pT< 5.0GeV/c as a function of collision centrality. The results are compared with theoretical calculations and provide important constraints on the initial conditions, including initial spatial geometry and its fluctuations, as well as the ratio of the shear viscosity to entropy density of the produced system.

Published
2017

161. Exploring jet substructures with jet shapes in ALICE

Author

Acharya, Shreyasi, Adam, Jaroslav, Adamová, Dagmar, Adolfsson, Jonatan, Aggarwal, Madan M., Aglieri Rinella, G, Agnello, Michelangelo, Agrawal, Nikita, Ahammed, Zubayer, Ahmad, N, Ahn, SU, Aiola, Salvatore, Akindinov, Alexander, Alam, Sk Noor, Alba, José Luis Bazo, Aleksandrov, Dimitry, Allesandro, B., Alme, Johan, Altenkaemper, Lucas, Arsene, Ionut Christian, Bätzing, Paul Christoph, Djuvsland, Øystein, Dordic, Olja, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Langøy, Rune, Lardeux, Antoine Xavier, Lien, Jørgen André, Lindal, Svein, Lønne, Per-Ivar, Mahmood, Sohail Musa, Milosevic, Jovan, Nesbø, Simon Voigt, Nystrand, Joakim, Rehman, Attiq Ur, Richter, Matthias Rudolph, Røed, Ketil, Røhrich, Dieter, Skaali, Toralf Bernhard, Tambave, Ganesh Jagannath, Tveter, Trine Spedstad, Ullaland, Kjetil, Velure, Arild, Wagner, Boris, Wikne, Jon Christopher, Zhang, Hui, Zhao, Chengxin, Zhou, Zhuo, Zhu, Hongsheng, and ALICE, Collaboration

Subjects
Nuclear and High Energy Physics, Energy loss, Particle physics, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Parton, nucl-ex, 01 natural sciences, Nuclear physics, 0103 physical sciences, Jets, Nuclear Physics - Experiment, jet substructure, Nuclear Experiment (nucl-ex), Matematikk og Naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431 [VDP], 010306 general physics, Jet quenching, Nuclear Experiment, Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Plasma, jet quenching, Quark–gluon plasma, Substructure, High Energy Physics::Experiment
Abstract

The characterization of the jet substructure can give insight into the microscopic nature of the modification induced on high-momentum partons by the Quark-Gluon Plasma that is formed in ultra-relativistic heavy-ion collisions. Jet shapes allow us to study the modification of parton to jet fragmentation and virtuality, probing jet energy redistribution, intra-jet broadening or collimation and possible flavour hierarchy. Results of a selected set of jet shapes will be presented for $\mbox{p--Pb}$ collisions at $\sqrt{s_{\scriptscriptstyle \rm NN}}= 5.02~\mathrm{TeV}$ and for $\mbox{Pb--Pb}$ collisions at $\sqrt{s_{\scriptscriptstyle \rm NN}} = 2.76~\mathrm{TeV}$. Results are also compared with PYTHIA calculations and models that include in-medium energy loss., Proceedings of the XXVIth International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2017) 5 pages, 5 figures

Published
2017

162. Anisotropic flow of inclusive and identified particles in Pb–Pb collisions at sNN=5.02 TeV with ALICE

Author

Acharya, Shreyasi, Adam, Jaroslav, Adamová, Dagmar, Adolfsson, Jonatan, Aggarwal, Madan M., Aglieri Rinella, G, Agnello, Michelangelo, Agrawal, Nikita, Ahammed, Zubayer, Ahmad, N, Ahn, SU, Alme, Johan, Altenkaemper, Lucas, Arsene, Ionut Christian, Bätzing, Paul Christoph, Djuvsland, Øystein, Dordic, Olja, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Langøy, Rune, Lardeux, Antoine Xavier, Lien, Jørgen André, Lindal, Svein, Lønne, Per-Ivar, Mahmood, Sohail Musa, Milosevic, Jovan, Nesbø, Simon Voigt, Nystrand, Joakim, Rehman, Attiq Ur, Richter, Matthias Rudolph, Røed, Ketil, Røhrich, Dieter, Skaali, Toralf Bernhard, Tambave, Ganesh Jagannath, Tveter, Trine Spedstad, Ullaland, Kjetil, Velure, Arild, Wagner, Boris, Wikne, Jon Christopher, Zhang, Hui, Zhao, Chengxin, Zhou, Zhuo, Zhu, Hongsheng, Aiola, Salvatore, Akindinov, Alexander, Alam, Sk Noor, Alba, José Luis Bazo, Aleksandrov, Dimitry, Allesandro, B., De Albuquerque, Danilo Silva, and ALICE, Collaboration

Published
2017

163. φ meson production in Pb-Pb collisions at √sNN = 5.02 TeV with ALICE at the LHC

Author

Acharya, Shreyasi, Adam, Jaroslav, Adamová, Dagmar, Adolfsson, Jonatan, Aggarwal, Madan M., Aglieri Rinella, Gianluca, Agnello, Michelangelo, Agrawal, Nikita, Ahammed, Zubayer, Ahmad, Nazeer, Ahn, Sang Un, Alme, Johan, Altenkaemper, Lucas, Arsene, Ionut Christian, Bätzing, Paul Christoph, Djuvsland, Øystein, Dordic, Olja, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Langøy, Rune, Lardeux, Antoine Xavier, Lien, Jørgen, Lindal, Svein, Lønne, Per-Ivar, Mahmood, Sohail Musa, Milosevic, Jovan, Nesbø, Simon Voigt, Nystrand, Joakim, Rehman, Attiq ur, Richter, Matthias, Røed, Ketil, Røhrich, Dieter, Skaali, Toralf Bernhard, Tambave, Ganesh Jagannath, Tveter, Trine Spedstad, Ullaland, Kjetil, Velure, Arild, Wagner, Boris, Wikne, Jon Christopher, Zhang, Hui, Zhao, Chengxin, Zhou, Zhuo, Zhu, Hongsheng, Aiola, Salvatore, Akindinov, Alexander, Alam, Sk Noor, Alba, José Luis Bazo, Aleksandrov, Dimitry, Allesandro, B., De Albuquerque, Danilo Silva, and ALICE, Collaboration

Subjects
High Energy Physics::Phenomenology, Nuclear Theory, High Energy Physics::Experiment, Matematikk og Naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431 [VDP], Nuclear Experiment
Abstract

Strangeness production is a key tool to understand the properties of the medium formed in heavy-ion collisions: an enhanced production of strange particles was early proposed as one of the signatures of the Quark-Gluon Plasma. The φ meson, due to its s ¯s valence quark content, provides insight into strangeness production. The ALICE experiment has measured φ meson production in the dimuon channel in the forward rapidity region 2.5 < y < 4 in Pb–Pb collisions at √sNN = 5.02 TeV. The preliminary φ meson pT spectra for different centrality classes and the yield as a function of the collision centrality in the transverse momentum range 2 < pT < 7 GeV/c are presented. These results are also compared with the ones previously obtained in Pb–Pb collisions at √sNN = 2.76 TeV.

Published
2017

164. Probing non-linearity of higher order anisotropic flow in Pb-Pb collisions

Author

Acharya, Shreyasi, Adam, Jaroslav, Adamová, Dagmar, Adolfsson, Jonatan, Aggarwal, Madan M., Aglieri Rinella, G, Agnello, Michelangelo, Agrawal, Nikita, Ahammed, Zubayer, Ahmad, N, Ahn, SU, Alme, Johan, Altenkaemper, Lucas, Arsene, Ionut Christian, Bätzing, Paul Christoph, Djuvsland, Øystein, Dordic, Olja, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Langøy, Rune, Lardeux, Antoine Xavier, Lien, Jørgen André, Lindal, Svein, Lønne, Per-Ivar, Mahmood, Sohail Musa, Milosevic, Jovan, Nesbø, Simon Voigt, Nystrand, Joakim, Rehman, Attiq Ur, Richter, Matthias Rudolph, Røed, Ketil, Røhrich, Dieter, Skaali, Toralf Bernhard, Tambave, Ganesh Jagannath, Tveter, Trine Spedstad, Ullaland, Kjetil, Velure, Arild, Wagner, Boris, Wikne, Jon Christopher, Zhang, Hui, Zhao, Chengxin, Zhou, Zhuo, Zhu, Hongsheng, Aiola, Salvatore, Akindinov, Alexander, Alam, Sk Noor, Alba, José Luis Bazo, Aleksandrov, Dimitry, Allesandro, B., De Albuquerque, Danilo Silva, and ALICE, Collaboration

Subjects
Nuclear and High Energy Physics, Particle physics, Nuclear Theory, nucl-th, FOS: Physical sciences, nucl-ex, 01 natural sciences, Nuclear Theory (nucl-th), 0103 physical sciences, Nuclear Physics - Experiment, Matematikk og Naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431 [VDP], Nuclear Experiment (nucl-ex), 010306 general physics, Anisotropy, Nuclear Experiment, Physics, Large Hadron Collider, 010308 nuclear & particles physics, Detector, Mode (statistics), Observable, Computational physics, Third order, Nonlinear system, Flow (mathematics), Nuclear Physics - Theory
Abstract

The second and the third order anisotropic flow, $V_{2}$ and $V_3$, are determined by the corresponding initial spatial anisotropy coefficients, $\varepsilon_{2}$ and $\varepsilon_{3}$, in the initial density distribution. On the contrary, the higher order anisotropic flow $V_n$ ($n > 3$), in addition to their dependence on the same order initial anisotropy coefficient $\varepsilon_{n}$, have a significant contribution from lower order initial anisotropy coefficients, which leads to mode-coupling effects. In this contribution, we present the investigations on linear and non-linear modes in higher order anisotropic flow ($V_{4}$, $V_{5}$ and $V_{6}$) in Pb--Pb collisions at $\sqrt{s_{\rm NN}} =$ 2.76 TeV using the ALICE detector at the Large Hadron Collider (LHC). A significant contribution from a non-linear mode is observed. A new observable, the non-linear response coefficient, is measured as well. The comparison to theoretical calculations provides crucial information on dynamic of the created system especially at the freeze-out conditions, which are poorly known from previous flow measurements., 4 pages, 3 figures, XXVIth International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2017), Chicago, US

Published
2017
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165. Measurement of J/ψ production as a function of event multiplicity in pp collisions at √s = 13 TeV with ALICE

Author

Acharya, Shreyasi, Adam, Jaroslav, Adamová, Dagmar, Adolfsson, Jonatan, Aggarwal, Madan M., Aglieri Rinella, Gianluca, Agnello, Michelangelo, Agrawal, Nikita, Ahammed, Zubayer, Ahmad, Nazeer, Ahn, Sang Un, Alme, Johan, Altenkaemper, Lucas, Arsene, Ionut Christian, Bätzing, Paul Christoph, Djuvsland, Øystein, Dordic, Olja, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Langøy, Rune, Lardeux, Antoine Xavier, Lien, Jørgen, Lindal, Svein, Lønne, Per-Ivar, Mahmood, Sohail Musa, Milosevic, Jovan, Nesbø, Simon Voigt, Nystrand, Joakim, Rehman, Attiq ur, Richter, Matthias, Røed, Ketil, Røhrich, Dieter, Skaali, Toralf Bernhard, Tambave, Ganesh Jagannath, Tveter, Trine Spedstad, Ullaland, Kjetil, Velure, Arild, Wagner, Boris, Wikne, Jon Christopher, Zhang, Hui, Zhao, Chengxin, Zhou, Zhuo, Zhu, Hongsheng, Aiola, Salvatore, Akindinov, Alexander, Alam, Sk Noor, Alba, José Luis Bazo, Aleksandrov, Dimitry, Allesandro, B., and De Albuquerque, Danilo Silva

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment, Matematikk og Naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431 [VDP], Nuclear Experiment
Abstract

The availability at the LHC of the largest collision energy in pp collisions allows a significant advance in the measurement of J/ψ production as function of event multiplicity. The interesting relative increase observed with data at the LHC at √s = 7 TeV and at RHIC at √s = 0.2 TeV is studied now at unprecedented multiplicities at √s = 13 TeV. The measurement at mid-rapidity in the dielectron channel with ALICE is presented and discussed in comparison to predictions from available theoretical models and to data at lower energies.

Published
2017

166. Measurements of the nuclear modification factor and elliptic flow of leptons from heavy-flavour hadron decays in Pb–Pb collisions at sNN=2.76 and 5.02 TeV with ALICE

Author

Acharya, Shreyasi, Adam, Jaroslav, Adamová, Dagmar, Adolfsson, Jonatan, Aggarwal, Madan M., Aglieri Rinella, G, Agnello, Michelangelo, Agrawal, Nikita, Ahammed, Zubayer, Ahmad, N, Ahn, SU, Alme, Johan, Altenkaemper, Lucas, Arsene, Ionut Christian, Bätzing, Paul Christoph, Djuvsland, Øystein, Dordic, Olja, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Langøy, Rune, Lardeux, Antoine Xavier, Lien, Jørgen André, Lindal, Svein, Lønne, Per-Ivar, Mahmood, Sohail Musa, Milosevic, Jovan, Nesbø, Simon Voigt, Nystrand, Joakim, Rehman, Attiq Ur, Richter, Matthias Rudolph, Røed, Ketil, Røhrich, Dieter, Skaali, Toralf Bernhard, Tambave, Ganesh Jagannath, Tveter, Trine Spedstad, Ullaland, Kjetil, Velure, Arild, Wagner, Boris, Wikne, Jon Christopher, Zhang, Hui, Zhao, Chengxin, Zhou, Zhuo, Zhu, Hongsheng, Aiola, Salvatore, Akindinov, Alexander, Alam, Sk Noor, Alba, José Luis Bazo, Aleksandrov, Dimitry, Allesandro, B., and ALICE, Collaboration

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract

We present the ALICE results on the nuclear modification factor and elliptic flow of electrons and muons from open heavy-flavour hadron decays at mid-rapidity and forward rapidity in Pb–Pb collisions at √sNN = 2.76 and 5.02 TeV for different centrality intervals. The results are compared to model calculations that include interactions of heavy quarks with the medium.

Published
2017

167. Multiplicity dependence of jet-like two-particle correlations in pp collisions at s=7 and 13 TeV with ALICE

Author

Acharya, Shreyasi, Adam, Jaroslav, Adamová, Dagmar, Adolfsson, Jonatan, Aggarwal, Madan M., Aglieri Rinella, G, Agnello, Michelangelo, Agrawal, Nikita, Ahammed, Zubayer, Ahmad, N, Ahn, SU, Alme, Johan, Altenkaemper, Lucas, Arsene, Ionut Christian, Bätzing, Paul Christoph, Djuvsland, Øystein, Dordic, Olja, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Langøy, Rune, Lardeux, Antoine Xavier, Lien, Jørgen André, Lindal, Svein, Lønne, Per-Ivar, Mahmood, Sohail Musa, Milosevic, Jovan, Nesbø, Simon Voigt, Nystrand, Joakim, Rehman, Attiq Ur, Richter, Matthias Rudolph, Røed, Ketil, Røhrich, Dieter, Skaali, Toralf Bernhard, Tambave, Ganesh Jagannath, Tveter, Trine Spedstad, Ullaland, Kjetil, Velure, Arild, Wagner, Boris, Wikne, Jon Christopher, Zhang, Hui, Zhao, Chengxin, Zhou, Zhuo, Zhu, Hongsheng, Aiola, Salvatore, Akindinov, Alexander, Alam, Sk Noor, Alba, José Luis Bazo, Aleksandrov, Dimitry, Allesandro, B., De Albuquerque, Danilo Silva, and ALICE, Collaboration

Subjects
High Energy Physics::Experiment, Nuclear Experiment
Abstract

Two-particle correlations in relative azimuthal angle (Δφ) and pseudorapidity (Δη) have been used to study heavy-ion collision dynamics, including medium-induced jet modification. Further investigations also showed the importance of Multiple Parton Interactions (MPI) in high-multiplicity pp collisions, which are often described by pQCD-inspired models. In these proceedings the latest ALICE measurements of two-particle correlations as a function of multiplicity in pp collisions are presented using the data from Run I and Run II at the LHC.

Published
2017

168. Jet-hadron correlations relative to the event plane at the LHC with ALICE

Author

Acharya, Shreyasi, Adam, Jaroslav, Adamová, Dagmar, Adolfsson, Jonatan, Aggarwal, Madan M., Aglieri Rinella, G, Agnello, Michelangelo, Agrawal, Nikita, Ahammed, Zubayer, Ahmad, N, Ahn, SU, Aiola, Salvatore, Akindinov, Alexander, Alam, Sk Noor, Alba, José Luis Bazo, Aleksandrov, Dimitry, Allesandro, B., Alme, Johan, Altenkaemper, Lucas, Arsene, Ionut Christian, Bätzing, Paul Christoph, Djuvsland, Øystein, Dordic, Olja, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Langøy, Rune, Lardeux, Antoine Xavier, Lien, Jørgen André, Lindal, Svein, Lønne, Per-Ivar, Mahmood, Sohail Musa, Milosevic, Jovan, Nesbø, Simon Voigt, Nystrand, Joakim, Rehman, Attiq Ur, Richter, Matthias Rudolph, Røed, Ketil, Røhrich, Dieter, Skaali, Toralf Bernhard, Tambave, Ganesh Jagannath, Tveter, Trine Spedstad, Ullaland, Kjetil, Velure, Arild, Wagner, Boris, Wikne, Jon Christopher, Zhang, Hui, Zhao, Chengxin, Zhou, Zhuo, Zhu, Hongsheng, and ALICE, Collaboration

Subjects
Nuclear and High Energy Physics, History, energy loss, Astrophysics::High Energy Astrophysical Phenomena, Hadron, FOS: Physical sciences, Parton, Jet (particle physics), nucl-ex, 01 natural sciences, Education, Nuclear physics, ALICE, path-length dependence, Jets, 0103 physical sciences, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), Matematikk og Naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431 [VDP], 010306 general physics, Jet quenching, Nuclear Experiment, background subtraction, Quantum chromodynamics, Physics, Large Hadron Collider, jet-hadron correlations, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Perturbative QCD, Computer Science Applications, Quark–gluon plasma, High Energy Physics::Experiment, RPF, Event (particle physics), Particle Physics - Experiment
Abstract

The hot, dense and strongly interacting medium known as the Quark Gluon Plasma (QGP) is produced in relativistic heavy-ion collisions at the Large Hadron Collider (LHC). Early in the collisions, quarks and gluons from the incoming nuclei collide to produce high momentum partons which fragment into collimated sprays of hadrons called "jets". In pp collisions, jet production is well understood within the framework of perturbative QCD and acts as a rigorous baseline measurement for jet quenching measurements. Using pp as a reference, we can compare to heavy-ion collision systems, and study the modification of the $p_{T}$ or angular distributions of jet fragments. A recently developed background subtraction method to remove the complex, flow dominated, heavy-ion background will be used in this analysis. Azimuthal angular correlations of charged hadrons with respect to the axis of a full (charged + neutral) reconstructed 'trigger' jet in Pb--Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV in ALICE will be presented here. The analysis of angular correlations for different orientations of the trigger relative to the event plane allows for the study of the path length dependence of medium modifications to jets. The status of studies of the event plane dependence of angular correlations will be presented., 4 pages, 4 figures, Hot Quarks 2016 conference

Published
2017

169. D-meson nuclear modification factor and elliptic flow measurements in Pb–Pb collisions at √sNN=5.02TeV with ALICE at the LHC

Author

Acharya, Shreyasi, Adam, Jaroslav, Adamová, Dagmar, Adolfsson, Jonatan, Aggarwal, Madan M., Aglieri Rinella, Gianluca, Agnello, Michelangelo, Agrawal, Nikita, Ahammed, Zubayer, Ahmad, Nazeer, Ahn, Sang Un, Aiola, Salvatore, Akindinov, Alexander, Alam, Sk Noor, Alba, José Luis Bazo, Albuquerque, D. S. D., Aleksandrov, Dimitry, Alessandro, Bruno, Alfaro Molina, José Rubén, Alici, Andrea, Alkin, Anton, Alme, Johan, Altenkaemper, Lucas, Arsene, Ionut Christian, Bätzing, Paul Christoph, Djuvsland, Øystein, Dordic, Olja, Helstrup, Håvard, Hetland, Kristin Fanebust, Kileng, Bjarte, Langøy, Rune, Lardeux, Antoine Xavier, Lien, Jørgen, Lindal, Svein, Lønne, Per-Ivar, Mahmood, Sohail Musa, Milosevic, Jovan, Nesbø, Simon Voigt, Nystrand, Joakim, Rehman, Attiq ur, Richter, Matthias, Røed, Ketil, Røhrich, Dieter, Skaali, Toralf Bernhard, Tambave, Ganesh Jagannath, Tveter, Trine Spedstad, Ullaland, Kjetil, Velure, Arild, Wagner, Boris, Wikne, Jon Christopher, Zhang, Hui, Zhao, Chengxin, Zhou, Zhuo, Zhu, Hongsheng, and ALICE, Collaboration

Subjects
Nuclear Theory, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Matematikk og Naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431 [VDP], Nuclear Experiment
Abstract

ALICE measured the nuclear modification factor (RAA) and elliptic flow (v2) of D mesons (D0, D+, D∗+ and D+ s ) in semi-central Pb–Pb collisions at √sNN = 5.02 TeV. The increased amount of data in semi-central Pb–Pb events obtained with the LHC Run 2 provides access to more precise measurements for the RAA and the non-strange D-meson v2 with respect to Run 1 results, as well as to the first measurement of the Ds-meson v2 at LHC energies. The first application of the Event Shape Engineering technique in the analysis of the v2 coefficient of D0 and D+ mesons is also illustrated.

Published
2017

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