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  • Springer Science and Business Media LLC  (60)
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  • Springer Science and Business Media LLC  (60)
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  • 1
    Online Resource
    Online Resource
    Jet-like correlations with respect to $$\textrm{K}^{0}_\mathrm{{S}}$$ and $$\Lambda $$ ($$\overline{\Lambda }$$) in pp and central Pb–Pb collisions at $$\mathbf {\sqrt{s_\textrm{NN}}} = 5.02$$ TeV
    Springer Science and Business Media LLC ; 2023
    In:  The European Physical Journal C Vol. 83, No. 6 ( 2023-06-12)
    Details
    In: The European Physical Journal C, Springer Science and Business Media LLC, Vol. 83, No. 6 ( 2023-06-12)
    Abstract: Two-particle correlations with $$\textrm{K}^{0}_\mathrm{{S}}$$ K S 0 , $$\Lambda $$ Λ / $$\overline{\Lambda }$$ Λ ¯ , and charged hadrons as trigger particles in the transverse momentum range $$8{ 〈 }p_{{\textrm{T}},{\textrm{trig}}}{ 〈 }16$$ 8 〈 p T , trig 〈 16  GeV/ $$c$$ c , and associated charged particles within $$1{ 〈 }p_{{\textrm{T}},{\textrm{assoc}}}{ 〈 }8$$ 1 〈 p T , assoc 〈 8  GeV/ $$c$$ c , are studied at midrapidity in pp and central Pb–Pb collisions at a centre-of-mass energy per nucleon–nucleon collision $$\sqrt{s_{\textrm{NN}}}~=~5.02$$ s NN = 5.02  TeV with the ALICE detector at the LHC. After subtracting the contributions of the flow background, the per-trigger yields are extracted on both the near and away sides, and the ratio in Pb–Pb collisions with respect to pp collisions ( $$I_{\textrm{AA}}$$ I AA ) is computed. The per-trigger yield in Pb–Pb collisions on the away side is strongly suppressed to the level of $$I_{\textrm{AA}}$$ I AA $$\approx 0.6$$ ≈ 0.6 for $$p_{{\textrm{T}},{\textrm{assoc}}} 〉 3$$ p T , assoc 〉 3  GeV/ $$c$$ c as expected from strong in-medium energy loss, while an enhancement develops at low $$p_{{\textrm{T}},{\textrm{assoc}}}$$ p T , assoc on both the near and away sides, reaching $$I_{\textrm{AA}}$$ I AA $$\approx 1.8$$ ≈ 1.8 and 2.7 respectively. These findings are in good agreement with previous ALICE measurements from two-particle correlations triggered by neutral pions ( $$\pi ^{0}$$ π 0 –h) and charged hadrons (h–h) in Pb–Pb collisions at $$\sqrt{s_{\textrm{NN}}}~=~2.76$$ s NN = 2.76  TeV. Moreover, the correlations with $$\textrm{K}^{0}_\mathrm{{S}}$$ K S 0 mesons and $$\Lambda $$ Λ / $$\overline{\Lambda }$$ Λ ¯ baryons as trigger particles are compared to those of inclusive charged hadrons. The results are compared with the predictions of Monte Carlo models.
    Type of Medium: Online Resource
    ISSN: 1434-6052
    URL: Article
    DOI: 10.1140/epjc/s10052-023-11614-8
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 1397769-6
    detail.hit.zdb_id: 1459069-4
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  • 2
    Online Resource
    Online Resource
    Production of light (anti)nuclei in pp collisions at $$\sqrt{s} = 5.02$$ TeV
    Springer Science and Business Media LLC ; 2022
    In:  The European Physical Journal C Vol. 82, No. 4 ( 2022-04)
    Details
    In: The European Physical Journal C, Springer Science and Business Media LLC, Vol. 82, No. 4 ( 2022-04)
    Abstract: The study of the production of nuclei and antinuclei in pp collisions has proven to be a powerful tool to investigate the formation mechanism of loosely bound states in high-energy hadronic collisions. In this paper, the production of protons, deuterons and $$^{3}\mathrm {He}$$ 3 He and their charge conjugates at midrapidity is studied as a function of the charged-particle multiplicity in inelastic pp collisions at $$\sqrt{s}=5.02$$ s = 5.02 TeV using the ALICE detector. Within the uncertainties, the yields of nuclei in pp collisions at $$\sqrt{s}=5.02$$ s = 5.02 TeV are compatible with those in pp collisions at different energies and to those in p–Pb collisions when compared at similar multiplicities. The measurements are compared with the expectations of coalescence and Statistical Hadronisation Models. The results suggest a common formation mechanism behind the production of light nuclei in hadronic interactions and confirm that they do not depend on the collision energy but on the number of produced particles.
    Type of Medium: Online Resource
    ISSN: 1434-6052
    URL: Article
    DOI: 10.1140/epjc/s10052-022-10241-z
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 1397769-6
    detail.hit.zdb_id: 1459069-4
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  • 3
    Online Resource
    Online Resource
    Report of panel 3: Concept improvement
    Springer Science and Business Media LLC ; 1992
    In:  Journal of Fusion Energy Vol. 11, No. 3-4 ( 1992-12), p. 163-169
    Details
    In: Journal of Fusion Energy, Springer Science and Business Media LLC, Vol. 11, No. 3-4 ( 1992-12), p. 163-169
    Type of Medium: Online Resource
    ISSN: 0164-0313 , 1572-9591
    URL: Article
    DOI: 10.1007/BF01059520
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 1992
    detail.hit.zdb_id: 2016894-9
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  • 4
    Online Resource
    Online Resource
    Measurement of beauty production via non-prompt D0 mesons in Pb-Pb collisions at $$ \sqrt{{\textrm{s}}_{\textrm{NN}}} $$ = 5.02 TeV
    Springer Science and Business Media LLC ; 2022
    In:  Journal of High Energy Physics Vol. 2022, No. 12 ( 2022-12-21)
    Details
    In: Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2022, No. 12 ( 2022-12-21)
    Abstract: The production of non-prompt D 0 mesons from beauty-hadron decays was measured at midrapidity (| y | 〈 0 . 5) in Pb-Pb collisions at a nucleon-nucleon center-of-mass energy of $$ \sqrt{{\textrm{s}}_{\textrm{NN}}} $$ s NN = 5 . 02 TeV with the ALICE experiment at the LHC. Their nuclear modification factor ( R AA ), measured for the first time down to p T = 1 GeV /c in the 0–10% and 30–50% centrality classes, indicates a significant suppression, up to a factor of about three, for p T 〉 5 GeV /c in the 0–10% central Pb-Pb collisions. The data are described by models that include both collisional and radiative processes in the calculation of beauty-quark energy loss in the quark-gluon plasma, and quark recombination in addition to fragmentation as a hadronisation mechanism. The ratio of the non-prompt to prompt D 0 -meson R AA is larger than unity for p T 〉 4 GeV /c in the 0–10% central Pb-Pb collisions, as predicted by models in which beauty quarks lose less energy than charm quarks in the quark-gluon plasma because of their larger mass.
    Type of Medium: Online Resource
    ISSN: 1029-8479
    URL: Article
    DOI: 10.1007/JHEP12(2022)126
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 2027350-2
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  • 5
    Online Resource
    Online Resource
    Underlying-event properties in pp and p–Pb collisions at $$ \sqrt{s_{\textrm{NN}}} $$ = 5.02 TeV
    Springer Science and Business Media LLC ; 2023
    In:  Journal of High Energy Physics Vol. 2023, No. 6 ( 2023-06-05)
    Details
    In: Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2023, No. 6 ( 2023-06-05)
    Abstract: We report about the properties of the underlying event measured with ALICE at the LHC in pp and p–Pb collisions at $$ \sqrt{s_{\textrm{NN}}} $$ s NN = 5 . 02 TeV. The event activity, quantified by charged-particle number and summed- p T densities, is measured as a function of the leading-particle transverse momentum $$ \left({p}_{\textrm{T}}^{\textrm{trig}}\right) $$ p T trig . These quantities are studied in three azimuthal-angle regions relative to the leading particle in the event: toward, away, and transverse. Results are presented for three different p T thresholds (0.15, 0.5 and 1 GeV/ c ) at mid-pseudorapidity (| η | 〈 0 . 8). The event activity in the transverse region, which is the most sensitive to the underlying event, exhibits similar behaviour in both pp and p–Pb collisions, namely, a steep increase with $$ {p}_{\textrm{T}}^{\textrm{trig}} $$ p T trig for low $$ {p}_{\textrm{T}}^{\textrm{trig}} $$ p T trig , followed by a saturation at $$ {p}_{\textrm{T}}^{\textrm{trig}}\approx 5 $$ p T trig ≈ 5 GeV/ c . The results from pp collisions are compared with existing measurements at other centre-of-mass energies. The quantities in the toward and away regions are also analyzed after the subtraction of the contribution measured in the transverse region. The remaining jet-like particle densities are consistent in pp and p–Pb collisions for $$ {p}_{\textrm{T}}^{\textrm{trig}} 〉 10 $$ p T trig 〉 10 GeV/ c , whereas for lower $$ {p}_{\textrm{T}}^{\textrm{trig}} $$ p T trig values the event activity is slightly higher in p–Pb than in pp collisions. The measurements are compared with predictions from the PYTHIA 8 and EPOS LHC Monte Carlo event generators.
    Type of Medium: Online Resource
    ISSN: 1029-8479
    URL: Article
    DOI: 10.1007/JHEP06(2023)023
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 2027350-2
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  • 6
    Online Resource
    Online Resource
    Production of pions, kaons, and protons as a function of the relative transverse activity classifier in pp collisions at $$ \sqrt{s} $$ = 13 TeV
    Springer Science and Business Media LLC ; 2023
    In:  Journal of High Energy Physics Vol. 2023, No. 6 ( 2023-06-06)
    Details
    In: Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2023, No. 6 ( 2023-06-06)
    Abstract: The production of π ± , K ± , and $$ \left(\overline{\textrm{p}}\right)\textrm{p} $$ p ¯ p is measured in pp collisions at $$ \sqrt{s} $$ s = 13 TeV in different topological regions of the events. Particle transverse momentum ( p T ) spectra are measured in the “toward”, “transverse”, and “away” angular regions defined with respect to the direction of the leading particle in the event. While the toward and away regions contain the fragmentation products of the near-side and away-side jets, respectively, the transverse region is dominated by particles from the Underlying Event (UE). The relative transverse activity classifier, R T  =  N T /〈 N T 〉, is used to group events according to their UE activity, where N T is the measured charged-particle multiplicity per event in the transverse region and 〈 N T 〉 is the mean value over all the analysed events. The first measurements of identified particle p T spectra as a function of R T in the three topological regions are reported. It is found that the yield of high transverse momentum particles relative to the R T -integrated measurement decreases with increasing R T in both the toward and the away regions, indicating that the softer UE dominates particle production as R T increases and validating that R T can be used to control the magnitude of the UE. Conversely, the spectral shapes in the transverse region harden significantly with increasing R T . This hardening follows a mass ordering, being more significant for heavier particles. Finally, it is observed that the p T -differential particle ratios $$ \left(\textrm{p}+\overline{\textrm{p}}\right)/\left({\uppi}^{+}+{\uppi}^{-}\right) $$ p + p ¯ / π + + π − and (K + + K − ) / ( π + + π − ) in the low UE limit ( R T → 0) approach expectations from Monte Carlo generators such as PYTHIA 8 with Monash 2013 tune and EPOS LHC, where the jet-fragmentation models have been tuned to reproduce e + e − results.
    Type of Medium: Online Resource
    ISSN: 1029-8479
    URL: Article
    DOI: 10.1007/JHEP06(2023)027
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 2027350-2
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  • 7
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    Forward rapidity J/ψ production as a function of charged-particle multiplicity in pp collisions at $$ \sqrt{s} $$ = 5.02 and 13 TeV
    Springer Science and Business Media LLC ; 2022
    In:  Journal of High Energy Physics Vol. 2022, No. 6 ( 2022-06-06)
    Details
    In: Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2022, No. 6 ( 2022-06-06)
    Abstract: The production of J/ ψ is measured as a function of charged-particle multiplicity at forward rapidity in proton-proton (pp) collisions at center-of-mass energies $$ \sqrt{s} $$ s = 5.02 and 13 TeV. The J/ ψ mesons are reconstructed via their decay into dimuons in the rapidity interval (2.5 〈 y 〈 4.0), whereas the charged-particle multiplicity density (d N ch / d η ) is measured at midrapidity ( |η| 〈 1). The production rate as a function of multiplicity is reported as the ratio of the yield in a given multiplicity interval to the multiplicity-integrated one. This observable shows a linear increase with charged-particle multiplicity normalized to the corresponding average value for inelastic events (d N ch /d η /〈d N ch /d η 〉), at both the colliding energies. Measurements are compared with available ALICE results at midrapidity and theoretical model calculations. First measurement of the mean transverse momentum (〈 p T 〉) of J/ ψ in pp collisions exhibits an increasing trend as a function of d N ch /d η /〈d N ch /d η 〉 showing a saturation towards high charged-particle multiplicities.
    Type of Medium: Online Resource
    ISSN: 1029-8479
    URL: Article
    DOI: 10.1007/JHEP06(2022)015
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 2027350-2
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  • 8
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    Measurement of inclusive and leading subjet fragmentation in pp and Pb–Pb collisions at $$ \sqrt{s_{\textrm{NN}}} $$ = 5.02 TeV
    Springer Science and Business Media LLC ; 2023
    In:  Journal of High Energy Physics Vol. 2023, No. 5 ( 2023-05-31)
    Details
    In: Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2023, No. 5 ( 2023-05-31)
    Abstract: This article presents new measurements of the fragmentation properties of jets in both proton–proton (pp) and heavy-ion collisions with the ALICE experiment at the Large Hadron Collider (LHC). We report distributions of the fraction z r of transverse momentum carried by subjets of radius r within jets of radius R . Charged-particle jets are reconstructed at midrapidity using the anti- k T algorithm with jet radius R = 0 . 4, and subjets are reconstructed by reclustering the jet constituents using the anti- k T algorithm with radii r = 0 . 1 and r = 0 . 2. In proton–proton collisions, we measure both the inclusive and leading subjet distributions. We compare these measurements to perturbative calculations at next-to-leading logarithmic accuracy, which suggest a large impact of threshold resummation and hadronization effects on the z r distribution. In heavy-ion collisions, we measure the leading subjet distributions, which allow access to a region of harder jet frag- mentation than has been probed by previous measurements of jet quenching via hadron fragmentation distributions. The z r distributions enable extraction of the parton-to-subjet fragmentation function and allow for tests of the universality of jet fragmentation functions in the quark–gluon plasma (QGP). We find no significant modification of z r distributions in Pb–Pb compared to pp collisions. However, the distributions are also consistent with a hardening trend for z r 〈 0 . 95, as predicted by several jet quenching models. As z r → 1 our results indicate that any such hardening effects cease, exposing qualitatively new possibilities to disentangle competing jet quenching mechanisms. By comparing our results to theoretical calculations based on an independent extraction of the parton-to-jet fragmentation function, we find consistency with the universality of jet fragmentation and no indication of factorization breaking in the QGP.
    Type of Medium: Online Resource
    ISSN: 1029-8479
    URL: Article
    DOI: 10.1007/JHEP05(2023)245
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 2027350-2
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  • 9
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    Inclusive, prompt and non-prompt J/ψ production at midrapidity in p-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ = 5.02 TeV
    Springer Science and Business Media LLC ; 2022
    In:  Journal of High Energy Physics Vol. 2022, No. 6 ( 2022-06-03)
    Details
    In: Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2022, No. 6 ( 2022-06-03)
    Abstract: A measurement of inclusive, prompt, and non-prompt J/ ψ production in p-Pb collisions at a nucleon-nucleon centre-of-mass energy $$ \sqrt{s_{\mathrm{NN}}} $$ s NN = 5 . 02 TeV is presented. The inclusive J/ ψ mesons are reconstructed in the dielectron decay channel at midrapidity down to a transverse momentum p T = 0. The inclusive J/ ψ nuclear modification factor R pPb is calculated by comparing the new results in p-Pb collisions to a recently measured proton-proton reference at the same centre-of-mass energy. Non-prompt J/ ψ mesons, which originate from the decay of beauty hadrons, are separated from promptly produced J/ ψ on a statistical basis for p T larger than 1.0 GeV/ c . These results are based on the data sample collected by the ALICE detector during the 2016 LHC p-Pb run, corresponding to an integrated luminosity $$ \mathcal{L} $$ L int = 292 ± 11 μ b − 1 , which is six times larger than the previous publications. The total uncertainty on the p T -integrated inclusive J/ ψ and non-prompt J/ ψ cross section are reduced by a factor 1.7 and 2.2, respectively. The measured cross sections and R pPb are compared with theoretical models that include various combinations of cold nuclear matter effects. From the non-prompt J/ ψ production cross section, the $$ \mathrm{b}\overline{\mathrm{b}} $$ b b ¯ production cross section at midrapidity, $$ {\mathrm{d}\sigma}_{\mathrm{b}\overline{\mathrm{b}}} $$ d σ b b ¯ / d y , and the total cross section extrapolated over full phase space, $$ {\sigma}_{\mathrm{b}\overline{\mathrm{b}}} $$ σ b b ¯ , are derived.
    Type of Medium: Online Resource
    ISSN: 1029-8479
    URL: Article
    DOI: 10.1007/JHEP06(2022)011
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
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  • 10
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    Study of very forward energy and its correlation with particle production at midrapidity in pp and p-Pb collisions at the LHC
    Springer Science and Business Media LLC ; 2022
    In:  Journal of High Energy Physics Vol. 2022, No. 8 ( 2022-08-05)
    Details
    In: Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2022, No. 8 ( 2022-08-05)
    Abstract: The energy deposited at very forward rapidities (very forward energy) is a powerful tool for characterising proton fragmentation in pp and p-Pb collisions. The correlation of very forward energy with particle production at midrapidity provides direct insights into the initial stages and the subsequent evolution of the collision. Furthermore, the correlation with 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 interactions. Results about very forward energy, measured by the ALICE zero degree calorimeters (ZDCs), and its dependence on the activity measured at midrapidity in pp collisions at $$ \sqrt{s} $$ s = 13 TeV and in p-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ s NN = 8 . 16 TeV are discussed. The measurements performed in pp collisions are compared with the expectations of three hadronic interaction event generators: PYTHIA 6 (Perugia 2011 tune), PYTHIA 8 (Monash tune), and EPOS LHC. These results provide new constraints on the validity of models in describing the beam remnants at very forward rapidities, where perturbative QCD cannot be used.
    Type of Medium: Online Resource
    ISSN: 1029-8479
    URL: Article
    DOI: 10.1007/JHEP08(2022)086
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 2027350-2
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