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ALICE Preprints

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2018-07-20
04:10
Exploring the Phase Space of Jet Splittings at ALICE using Grooming and Recursive Techniques / Andrews, Harry Arthur
Hard splittings in the evolution of a jet may be modified by the presence of a dense strongly interacting medium. [...]
arXiv:1807.06439.
- 4 p.
00008 Lund kinematical diagram representation of splittings with limits imposed by a jet resolution $R$ (left)~\cite{THInst}, and populated for splittings in vacuum PYTHIA 6 Perugia 11 (right). - 00010 figure - 00009 figure - Fulltext - 00007 Lund kinematical diagram representation of splittings with limits imposed by a jet resolution $R$ (left)~\cite{THInst}, and populated for splittings in vacuum PYTHIA 6 Perugia 11 (right). - 00013 Raw Pb--Pb distributions of $z_{\rm{g}}$ for $R=0.4$ jets with varying minimum angular separation of subjets ($R_{\rm{g}}$) for jets with $ 80 \leq \pTjetchrec < 120$ GeV/$c$. The distributions are normalised to the total number of jets in the sample in this \pTjetchrec ~bin without cuts on $R_{\rm{g}}$. - 00011 Raw Pb--Pb distributions of $z_{\rm{g}}$ for $R=0.4$ jets with varying minimum angular separation of subjets ($R_{\rm{g}}$) for jets with $ 80 \leq \pTjetchrec < 120$ GeV/$c$. The distributions are normalised to the total number of jets in the sample in this \pTjetchrec ~bin without cuts on $R_{\rm{g}}$. - 00012 figure - Fulltext

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2018-07-20
04:10
Heavy-flavour hadron decay leptons in Pb--Pb and Xe--Xe collisions at the LHC with ALICE / Dubla, Andrea
Heavy quarks, i.e. [...]
arXiv:1807.05382.
-
Full text - 00009 Left: Comparison of the $R_{\rm AA}$ of electrons from beauty-hadron decays (red markers) with the one from charm- plus beauty-hadron decays (black markers) in Pb--Pb collisions at $\sqrt{s}$ = 5.02 TeV. Right: $R_{\rm AA}$ of electrons from beauty hadron decay in comparison with models implementing mass-dependent energy loss \cite{EPOS, Djordjevic, PHSD} in Pb--Pb collisions at $\sqrt{s}$ = 5.02 TeV. - 00010 Left: $R_{\rm AA}$ of electrons from heavy-flavour hadron decays as a function of $p_{\rm T}$ in central (0-10\%) Pb--Pb (black and grey markers) and in p--Pb (blue markers) collisions \cite{rpPbelectron} at $\sqrt{s}$ = 5.02 TeV. Right: $R_{\rm AA}$ of electrons from heavy-flavour hadron decays at $\sqrt{s}$ = 2.76 TeV in comparison with model calculations with and without the inclusion of the EPS09 shadowing parameterisations \cite{POWLANG, EPOS, TAMU}. - 00007 Nuclear modification factors of electrons (black markers) and muons (red markers) from heavy-flavour hadron decay in central (left panel) and semi-central (right panel) Xe--Xe collisions at $\sqrt{s_{\rm NN}}$ = 5.44 TeV. - 00006 Left: Comparison of the $R_{\rm AA}$ of electrons from beauty-hadron decays (red markers) with the one from charm- plus beauty-hadron decays (black markers) in Pb--Pb collisions at $\sqrt{s}$ = 5.02 TeV. Right: $R_{\rm AA}$ of electrons from beauty hadron decay in comparison with models implementing mass-dependent energy loss \cite{EPOS, Djordjevic, PHSD} in Pb--Pb collisions at $\sqrt{s}$ = 5.02 TeV. - 00008 $p_\mathrm{T}$-differential production cross section for electrons from heavy-flavour hadron decay in pp collisions at several collision energies (from left to right panel: $\sqrt{s}$ = 2.76, 5.02, 7 and 13 TeV) in comparison with FONLL calculations \cite{FONLL}. - 00011 Left: $R_{\rm AA}$ of electrons from heavy-flavour hadron decays as a function of $p_{\rm T}$ in central (0-10\%) Pb--Pb (black and grey markers) and in p--Pb (blue markers) collisions \cite{rpPbelectron} at $\sqrt{s}$ = 5.02 TeV. Right: $R_{\rm AA}$ of electrons from heavy-flavour hadron decays at $\sqrt{s}$ = 2.76 TeV in comparison with model calculations with and without the inclusion of the EPS09 shadowing parameterisations \cite{POWLANG, EPOS, TAMU}. - Fulltext

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2018-07-12
09:12
Collider studies on jet and heavy flavour properties / Candelise, Vieri (INFN, Trieste ; Trieste U.) /ALICE,ATLAS,CMS and LHCB Collaborations
The Large Hadron Collider at CERN is the world's most efficient jet factory. In this report the properties of jets will be discussed, with focus on reconstructed jets in the ATLAS, CMS and LHCb experiments. [...]
CMS-CR-2018-075.- Geneva : CERN, 2018 - 12 p. Fulltext: PDF;
In : XXVI International Workshop on Deep Inelastic Scattering and Related Subjects, Kobe, Hyogo, Japan, 16 - 20 Apr 2018

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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; External links: 00043 $g$, $p_{\rm T}D$, and $LeSub$ for quark and gluon jets as obtained from PYTHIA Perugia 2011 simulations of pp collisions at $\sqrt{s}=2.76$\,TeV in the transverse momentum interval $40 \leq p_{\mathrm{T,jet}}^{\rm{part,ch}} \leq 60$\,GeV/$c$.; 00033 $g$, $p_{\rm T}D$, and $LeSub$ as obtained from PYTHIA Perugia 2011 simulations of pp collisions at $\sqrt{s}=2.76$\,TeV for three different transverse momentum intervals.; 00049 $g$, $p_{\rm T}D$, and $LeSub$ for quark and gluon jets as obtained from PYTHIA Perugia 2011 simulations of pp collisions at $\sqrt{s}=2.76$\,TeV in the transverse momentum interval $40 \leq p_{\mathrm{T,jet}}^{\rm{part,ch}} \leq 60$\,GeV/$c$.; 00035 $g$, $p_{\rm T}D$, and $LeSub$ as obtained from PYTHIA Perugia 2011 simulations of pp collisions at $\sqrt{s}=2.76$\,TeV for three different transverse momentum intervals.; 00053 Left plots show the distributions of residuals for the set of three jet shapes in a given interval of $p_{\rm{T,jet}}^{\rm{part,ch}}$ $40$--$60$ GeV/$c$ using the PYTHIA and PYTHIA embedded simulations. Right plots show the width (quantified as the standard deviation) of the distributions on the left as a function of the values of the shapes at particle level. The black and red curves correspond to pp and Pb--Pb simulations, respectively. The line connecting the points on the right is drawn to guide the eye.; 00047 Left plots show the distributions of residuals for the set of three jet shapes in a given interval of $p_{\rm{T,jet}}^{\rm{part,ch}}$ $40$--$60$ GeV/$c$ using the PYTHIA and PYTHIA embedded simulations. Right plots show the width (quantified as the standard deviation) of the distributions on the left as a function of the values of the shapes at particle level. The black and red curves correspond to pp and Pb--Pb simulations, respectively. The line connecting the points on the right is drawn to guide the eye.; 00032 Left plots show the distributions of residuals for the set of three jet shapes in a given interval of $p_{\rm{T,jet}}^{\rm{part,ch}}$ $40$--$60$ GeV/$c$ using the PYTHIA and PYTHIA embedded simulations. Right plots show the width (quantified as the standard deviation) of the distributions on the left as a function of the values of the shapes at particle level. The black and red curves correspond to pp and Pb--Pb simulations, respectively. The line connecting the points on the right is drawn to guide the eye.; 00034 Left plots show the distributions of residuals for the set of three jet shapes in a given interval of $p_{\rm{T,jet}}^{\rm{part,ch}}$ $40$--$60$ GeV/$c$ using the PYTHIA and PYTHIA embedded simulations. Right plots show the width (quantified as the standard deviation) of the distributions on the left as a function of the values of the shapes at particle level. The black and red curves correspond to pp and Pb--Pb simulations, respectively. The line connecting the points on the right is drawn to guide the eye.; 00037 $g$, $p_{\rm T}D$, and $LeSub$ for quark and gluon jets as obtained from PYTHIA Perugia 2011 simulations of pp collisions at $\sqrt{s}=2.76$\,TeV in the transverse momentum interval $40 \leq p_{\mathrm{T,jet}}^{\rm{part,ch}} \leq 60$\,GeV/$c$.; 00036 Left plots show the distributions of residuals for the set of three jet shapes in a given interval of $p_{\rm{T,jet}}^{\rm{part,ch}}$ $40$--$60$ GeV/$c$ using the PYTHIA and PYTHIA embedded simulations. Right plots show the width (quantified as the standard deviation) of the distributions on the left as a function of the values of the shapes at particle level. The black and red curves correspond to pp and Pb--Pb simulations, respectively. The line connecting the points on the right is drawn to guide the eye.; 00048 $g$, $p_{\rm T}D$, and $LeSub$ as obtained from PYTHIA Perugia 2011 simulations of pp collisions at $\sqrt{s}=2.76$\,TeV for three different transverse momentum intervals.; 00027 Left plots show the distributions of residuals for the set of three jet shapes in a given interval of $p_{\rm{T,jet}}^{\rm{part,ch}}$ $40$--$60$ GeV/$c$ using the PYTHIA and PYTHIA embedded simulations. Right plots show the width (quantified as the standard deviation) of the distributions on the left as a function of the values of the shapes at particle level. The black and red curves correspond to pp and Pb--Pb simulations, respectively. The line connecting the points on the right is drawn to guide the eye.; 00044 Jet shape distributions in $0$--$10\%$ central Pb--Pb collisions at $\sqrt{s_{\rm NN}}=2.76$\,TeV for $R = 0.2$ in range of jet $p_{\mathrm{T,jet}}^{\rm ch}$ of $40$--$60$\,GeV$/c$ compared to JEWEL with and without recoils with different subtraction methods. The coloured boxes represent the experimental uncertainty on the jet shapes.; 00045 Jet shape distributions in $0$--$10\%$ central Pb--Pb collisions at $\sqrt{s_{\rm NN}}=2.76$\,TeV for $R = 0.2$ in range of jet $p_{\mathrm{T,jet}}^{\rm ch}$ of $40$--$60$\,GeV$/c$ compared to quark and gluon vacuum generated jet shape distributions. The coloured boxes represent the experimental uncertainty on the jet shapes.; 00038 Background subtraction performance for jet shapes studied with jets from PYTHIA events embedded into real Pb--Pb events, in the background subtracted transverse momentum interval $40 \leq p_{\mathrm{T,jet}}^{\rm{rec,ch}} \leq 60$\,GeV/$c$ for the area derivatives and constituent subtraction methods.; 00050 Background subtraction performance for jet shapes studied with jets from PYTHIA events embedded into real Pb--Pb events, in the background subtracted transverse momentum interval $40 \leq p_{\mathrm{T,jet}}^{\rm{rec,ch}} \leq 60$\,GeV/$c$ for the area derivatives and constituent subtraction methods.; 00031 Jet shape distributions in $0$--$10\%$ central Pb--Pb collisions at $\sqrt{s_{\rm NN}}=2.76$\,TeV for $R = 0.2$ in range of jet $p_{\mathrm{T,jet}}^{\rm ch}$ of $40$--$60$\,GeV$/c$ compared to JEWEL with and without recoils with different subtraction methods. The coloured boxes represent the experimental uncertainty on the jet shapes.; 00029 Jet shape distributions in $0$--$10\%$ central Pb--Pb collisions at $\sqrt{s_{\rm NN}}=2.76$\,TeV for $R = 0.2$ in range of jet $p_{\mathrm{T,jet}}^{\rm ch}$ of $40$--$60$\,GeV$/c$ compared to quark and gluon vacuum generated jet shape distributions. The coloured boxes represent the experimental uncertainty on the jet shapes.; 00028 Jet shape distributions in $0$--$10\%$ central Pb--Pb collisions at $\sqrt{s_{\rm NN}}=2.76$\,TeV for $R = 0.2$ in range of jet $p_{\mathrm{T,jet}}^{\rm ch}$ of $40$--$60$\,GeV$/c$ compared to JEWEL with and without recoils with different subtraction methods. The coloured boxes represent the experimental uncertainty on the jet shapes.; 00030 Jet shape distributions in $0$--$10\%$ central Pb--Pb collisions at $\sqrt{s_{\rm NN}}=2.76$\,TeV for $R = 0.2$ in range of jet $p_{\mathrm{T,jet}}^{\rm ch}$ of $40$--$60$\,GeV$/c$ compared to quark and gluon vacuum generated jet shape distributions. The coloured boxes represent the experimental uncertainty on the jet shapes.; 00040 Fully corrected jet shape distributions measured in pp collisions at $\sqrt{s}=7$\,TeV for $R = 0.2$ in the range of jet $p_{\mathrm{T,jet}}^{\rm ch}$ of $40$--$60$\,GeV$/c$. The results are compared to PYTHIA. The results are compared to PYTHIA. The coloured boxes represent the uncertainty on the jet shape (upper panels) and its propagation to the ratio (lower panels); 00042 Fully corrected jet shape distributions in $0$--$10\%$ central Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$\,TeV for $R = 0.2$ in the range of jet $p_{\mathrm{T,jet}}^{\rm ch}$ of $40$--$60$\,GeV$/c$. The results are compared to PYTHIA. The coloured boxes represent the uncertainty on the jet shape (upper panels) and its propagation to the ratio (lower panels).; 00052 Fully corrected jet shape distributions in $0$--$10\%$ central Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$\,TeV for $R = 0.2$ in the range of jet $p_{\mathrm{T,jet}}^{\rm ch}$ of $40$--$60$\,GeV$/c$. The results are compared to PYTHIA. The coloured boxes represent the uncertainty on the jet shape (upper panels) and its propagation to the ratio (lower panels).; 00039 Fully corrected jet shape distributions in $0$--$10\%$ central Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$\,TeV for $R = 0.2$ in the range of jet $p_{\mathrm{T,jet}}^{\rm ch}$ of $40$--$60$\,GeV$/c$. The results are compared to PYTHIA. The coloured boxes represent the uncertainty on the jet shape (upper panels) and its propagation to the ratio (lower panels).; 00046 Fully corrected jet shape distributions measured in pp collisions at $\sqrt{s}=7$\,TeV for $R = 0.2$ in the range of jet $p_{\mathrm{T,jet}}^{\rm ch}$ of $40$--$60$\,GeV$/c$. The results are compared to PYTHIA. The results are compared to PYTHIA. The coloured boxes represent the uncertainty on the jet shape (upper panels) and its propagation to the ratio (lower panels); 00041 Fully corrected jet shape distributions measured in pp collisions at $\sqrt{s}=7$\,TeV for $R = 0.2$ in the range of jet $p_{\mathrm{T,jet}}^{\rm ch}$ of $40$--$60$\,GeV$/c$. The results are compared to PYTHIA. The results are compared to PYTHIA. The coloured boxes represent the uncertainty on the jet shape (upper panels) and its propagation to the ratio (lower panels); 00051 Background subtraction performance for jet shapes studied with jets from PYTHIA events embedded into real Pb--Pb events, in the background subtracted transverse momentum interval $40 \leq p_{\mathrm{T,jet}}^{\rm{rec,ch}} \leq 60$\,GeV/$c$ for the area derivatives and constituent subtraction methods.; Fulltext

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2018-07-11
04:20
Pion Fluctuation Study in Pb-Pb Collision at 3.5TeV from ALICE Experiment with Chaos and Complex Network-based Methods / Bhaduri, Susmita (Unlisted, IN) ; Bhaduri, Anirban (Unlisted, IN) ; Ghosh, Dipak (Unlisted, IN)
Chaos and complex-network based study is performed to look for signature of phase transition in Pb-Pb collision data sample at 3.5 TeV from ALICE Collaboration. [...]
arXiv:1806.04904.
- 11 p.
Full text

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2018-07-08
04:19
Trigger and Timing Distributions using the TTC-PON and GBT Bridge Connection in ALICE for the LHC Run 3 Upgrade / Mitra, Jubin (Calcutta, VECC) ; David, Erno (Wigner RCP, Budapest) ; Mendez, Eduardo (CERN) ; Khan, Shuaib Ahmad (Calcutta, VECC) ; Kiss, Tivadar (Wigner RCP, Budapest) ; Baron, Sophie (CERN) ; Kluge, Alex (CERN) ; Nayak, Tapan (Calcutta, VECC)
The ALICE experiment at CERN is preparing for a major upgrade for the third phase of data taking run (Run 3), when the high luminosity phase of the Large Hadron Collider (LHC) starts. [...]
arXiv:1806.01350.
- 18 p.
Full text

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2018-06-28
13:16
Measurement of jets and photons with the ALICE experiment at the LHC / Leardini, L. (Heidelberg U.)
Jets and direct photons are used to probe the formation and the properties of the Quark-Gluon Plasma (QGP) by the ALICE Collaboration. [...]
arXiv:1805.09089.
- 4 p.
Fulltext

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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; 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; 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; CERN-EP-2018-122.- Geneva : CERN, 2018 - 23 p. Draft (restricted): PDF; Fulltext: PDF;

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