HAL Mines Nantes
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    7271 research outputs found

    XENONnT Analysis: Signal Reconstruction, Calibration and Event Selection

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    HAL CCSD
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    International audienceThe XENONnT experiment, located at the INFN Laboratori Nazionali del Gran Sasso, Italy, features a 5.9 tonne liquid xenon time projection chamber surrounded by an instrumented neutron veto, all of which is housed within a muon veto water tank. Due to extensive shielding and advanced purification to mitigate natural radioactivity, an exceptionally low background level of (15.8 ±\pm 1.3) events/(tonne⋅\cdotyear⋅\cdotkeV) in the (1, 30) keV region is reached in the inner part of the TPC. XENONnT is thus sensitive to a wide range of rare phenomena related to Dark Matter and Neutrino interactions, both within and beyond the Standard Model of particle physics, with a focus on the direct detection of Dark Matter in the form of weakly interacting massive particles (WIMPs). From May 2021 to December 2021, XENONnT accumulated data in rare-event search mode with a total exposure of one tonne ⋅\cdot year. This paper provides a detailed description of the signal reconstruction methods, event selection procedure, and detector response calibration, as well as an overview of the detector performance in this time frame. This work establishes the foundational framework for the `blind analysis' methodology we are using when reporting XENONnT physics results

    Measurement of the inclusive isolated-photon production cross section in pp and Pb−-Pb collisions at sNN=5.02\sqrt{s_{\rm NN}}=5.02 TeV

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    HAL CCSD
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    International audienceThe ALICE Collaboration at the CERN LHC has measured the inclusive production cross section of isolated photons at midrapidity as a function of the photon transverse momentum (pTγp_{\rm T}^{\gamma}), in Pb-Pb collisions in different centrality intervals, and in pp collisions, at centre-of-momentum energy per nucleon pair of sNN=5.02\sqrt{s_{\mathrm{NN}}}=5.02 TeV. The photon transverse momentum range is between 10-14 and 40-140 GeV/cc, depending on the collision system and on the Pb-Pb centrality class. The result extends to lower pTγp_{\rm T}^{\gamma} than previously published results by the ATLAS and CMS experiments at the same collision energy. The covered pseudorapidity range is ∣ηγ∣<0.67|\eta^{\gamma}| <0.67. The isolation selection is based on a charged particle isolation momentum threshold pTiso, ch=1.5p_{\rm T}^{\rm iso,~ch} = 1.5 GeV/cc within a cone of radii R=0.2R=0.2 and 0.40.4. The nuclear modification factor is calculated and found to be consistent with unity in all centrality classes, and also consistent with the HG-PYTHIA model, which describes the event selection and geometry biases that affect the centrality determination in peripheral Pb-Pb collisions. The measurement is compared to next-to-leading order perturbative QCD calculations and to the measurements of isolated photons and Z0^0 bosons from the CMS experiment, which are all found to be in agreement

    Addendum: Dielectron production in proton-proton and proton-lead collisions at sNN\sqrt{s_{\rm NN}} = 5.02 TeV

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    HAL CCSD
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    International audienceThis is an addendum to the article [arXiv:2005.11995] "Dielectron production in proton-proton and proton-lead collisions at sNN\sqrt{s_{\mathrm{NN}}} = 5.02 TeV" published in Phys. Rev. C 102 no. 5, (2020) 055204. We update the extracted charm cross section at midrapidity given in Table 3 and Figure 4 (left) of the original publication with the fragmentation fractions of charm quarks in pp collisions published in Phys. Rev. D 105 (2022) L011103

    First production of pure 155^{155}Gd targets and 155^{155}Gd(p,x)155^{155}Tb,156^{156}Tb cross-section measurements

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    Elsevier
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    International audience•Production of isotopically pure 155Gd targets.•Proton activation of isotopically pure 155Gd targets.•First measurement of 155Gd(p,x)155Tb and 156Tb cross-sections around 25 MeV.•Comparison of data obtained with pure 155Gd proton-activated targets, with TENDL-2023 library.•Highlight relevance of 155Gd targets use to limit production of the main contaminant 156Tb

    J/ψ\psi-hadron correlations at midrapidity in pp collisions at s\sqrt{s} = 13 TeV

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    HAL CCSD
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    International audienceWe report on the measurement of inclusive, non-prompt, and prompt J/ψ\psi-hadron correlations by the ALICE Collaboration at the CERN Large Hadron Collider in pp collisions at a center-of-mass energy of 13 TeV. The correlations are studied at midrapidity (∣y∣<0.9|y| < 0.9) in the transverse momentum ranges pT<40 GeV/cp_{\rm T} < 40~\text{GeV}/c for the J/ψ\psi and 0.15<pT<100.15 < p_{\rm T} < 10 GeV/cc and ∣η∣<0.9|\eta|<0.9 for the associated hadrons. The measurement is based on minimum bias and high multiplicity data samples corresponding to integrated luminosities of Lint=34 nb−1L_{\text{int}} = 34~\text{nb}^{-1} and Lint=6.9 pb−1L_{\text{int}} = 6.9~\text{pb}^{-1}, respectively. In addition, two more data samples are employed, requiring, on top of the minimum bias condition, a threshold on the tower energy of E=4E = 4 and 9 GeV9~\text{GeV} in the ALICE electromagnetic calorimeters, which correspond to integrated luminosities of Lint=0.9 pb−1L_{\text{int}} = 0.9~\text{pb}^{-1} and Lint=8.4 pb−1L_{\text{int}} = 8.4~\text{pb}^{-1}, respectively. The results are presented as associated hadron yields per J/ψ\psi trigger as a function of the azimuthal angle difference between the associated hadrons and J/ψ\psi mesons. The integrated near-side and away-side correlated yields are also extracted as a function of the J/ψ\psi transverse momentum. The measurements are discussed in comparison to PYTHIA calculations

    Higher-order symmetry plane correlations in Pb−-Pb collisions at sNN\sqrt{s_{\mathrm{NN}}} = 5.02 TeV

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    HAL CCSD
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    International audienceThe correlations between event-by-event fluctuations of symmetry planes are measured in Pb−-Pb collisions at a centre-of-mass energy per nucleon pair sNN\sqrt{s_{\mathrm{NN}}} = 5.02 TeV recorded by the ALICE detector at the Large Hadron Collider. This analysis is conducted using the Gaussian Estimator technique, which is insensitive to biases from correlations between different flow amplitudes. The study presents, for the first time, the centrality dependence of correlations involving up to five different symmetry planes. The correlation strength varies depending on the harmonic order of the symmetry plane and the collision centrality. Comparisons with measurements from lower energies indicate no significant differences within uncertainties. Additionally, the results are compared with hydrodynamic model calculations. Although the model predictions provide a qualitative explanation of the experimental results, they overestimate the data for some observables. This is particularly true for correlators that are sensitive to the non-linear response of the medium to initial-state anisotropies in the collision system. As these new correlators provide unique information - independent of flow amplitudes - their usage in future model developments can further constrain the properties of the strongly-interacting matter created in ultrarelativistic heavy-ion collisions

    Measurement of beauty production via non-prompt charm hadrons in p-Pb collisions at sNN=5.02\sqrt{s_{\mathrm{NN}}} = 5.02 TeV

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    HAL CCSD
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    International audienceThe production cross sections of D0\mathrm {D^0}, D+\mathrm {D^+}, and Λc+\mathrm {\Lambda_{c}^{+}} hadrons originating from beauty-hadron decays (i.e. non-prompt) were measured for the first time at midrapidity in proton−-lead (p−-Pb) collisions at the center-of-mass energy per nucleon pair of sNN=5.02\sqrt{s_{\mathrm{NN}}} = 5.02 TeV. Nuclear modification factors (RpPbR_{\mathrm {pPb}}) of non-prompt D0\mathrm {D^0}, D+\mathrm {D^+}, and Λc+\mathrm {\Lambda_{c}^{+}} are calculated as a function of the transverse momentum (pTp_{\mathrm T}) to investigate the modification of the momentum spectra measured in p−-Pb collisions with respect to those measured in proton−-proton (pp) collisions at the same energy. The RpPbR_{\mathrm {pPb}} measurements are compatible with unity and with the measurements in the prompt charm sector, and do not show a significant pTp_{\mathrm T} dependence. The pTp_{\mathrm T}-integrated cross sections and pTp_{\mathrm T}-integrated RpPbR_{\mathrm {pPb}} of non-prompt D0\mathrm {D^0} and D+\mathrm {D^+} mesons are also computed by extrapolating the visible cross sections down to pTp_{\mathrm T} = 0. The non-prompt D-meson RpPbR_{\mathrm {pPb}} integrated over pTp_{\mathrm T} is compatible with unity and with model calculations implementing modification of the parton distribution functions of nucleons bound in nuclei with respect to free nucleons. The non-prompt Λc+/D0\mathrm {\Lambda_{c}^{+}/D^{0}} and D+/D0\mathrm{D^+/D^0} production ratios are computed to investigate hadronisation mechanisms of beauty quarks into mesons and baryons. The measured ratios as a function of pTp_{\mathrm T} display a similar trend to that measured for charm hadrons in the same collision system

    nEXO, search for 0nbb beyond 10^{28} years

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    HAL CCSD
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    International audienc

    Multi-physics DONJON5 reactor models for improved fuel cycle simulation with CLASS

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    EDP Sciences
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    International audienceThis work investigates reactor model biases and their consequences in nuclear scenario simulations. Usually, the models for Pressurized Water Reactors are based on infinite 2D assembly depletion simulations, but recent work has shown the importance of 3D complete core simulation for uncertainty reduction. The consideration of a whole core leads to new reactor parameters in the simulations that may bring additional biases. The fuel temperature distribution is one of them, and previous work considered isothermal reactors, leading to probable uncertainties in spent fuel inventory at reactor discharge. To quantify those biases and their propagation in a full scenario simulation, new advanced reactor models have been developed, based on neutronics and thermal-hydraulics couplings at the core level performed with DONJON5. Results show that the plutonium isotopic quality of spent fuel is biased for an isothermal core, with values systematically higher than for multi-physics calculations. In order to propagate those discrepancies in fuel cycle simulations that involve plutonium recycling in PWR MOX fuels, the coupling between CLASS and DONJON was renewed in order to add new fuel parameters such as the fuel temperature in the core burn-up simulation. A new methodology for data interpolation from lattice calculation has been implemented that allows acceptable computational time for DONJON5 calculations that are done within the fuel cycle simulation performed by CLASS. Comparison between isothermal and multi-physics reactor models for advanced scenario simulations performed with CLASS shows that the isothermal hypothesis leads to biases up to 10% for plutonium inventory in the UOX spent fuel stockpile, comparable with biases associated with other reactor parameters such as the loading pattern

    Investigating Λ\Lambda baryon production in p-Pb collisions in jets and underlying event using angular correlations

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    HAL CCSD
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    International audienceFirst measurements of hadron(h)−Λ-\Lambda azimuthal angular correlations in p−-Pb collisions at sNN\sqrt{s_{\rm NN}} = 5.02 TeV using the ALICE detector at the LHC are presented. These correlations are used to separate the production of associated Λ\Lambda baryons into three different kinematic regions, namely those produced in the direction of the trigger particle (near-side), those produced in the opposite direction (away-side), and those whose production is uncorrelated with the jet-axis (underlying event). The per-trigger associated Λ\Lambda yields in these regions are extracted, along with the near- and away-side azimuthal peak widths, and the results are studied as a function of associated particle pTp_{\rm T} and event multiplicity. Comparisons with the DPMJET event generator and previous measurements of the ϕ(1020)\phi(1020) meson are also made. The final results indicate that strangeness production in the highest multiplicity p−-Pb collisions is enhanced relative to low multiplicity collisions in the jet-like regions, as well as the underlying event. The production of Λ\Lambda relative to charged hadrons is also enhanced in the underlying event when compared to the jet-like regions. Additionally, the results hint that strange quark production in the away-side of the jet is modified by soft interactions with the underlying event

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    HAL Mines Nantes
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