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0000-0001-6209-7627
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Prima Assicurazioni SpA
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Publisher: American Physical Society (APS)
Date: 04-06-2020
Publisher: Springer Science and Business Media LLC
Date: 17-07-2023
DOI: 10.1140/EPJC/S10052-023-11608-6
Abstract: The measurement of charmonium states produced in proton-neon ( $$p\\text {Ne}$$ p Ne ) collisions by the LHCb experiment in its fixed-target configuration is presented. The production of $${{J} \\hspace{-1.66656pt}/\\hspace{-1.111pt}\\psi }$$ J / ψ and $$\\psi {(2S)}$$ ψ ( 2 S ) mesons is studied with a beam of 2.5 $$\\mathrm{\\,Te\\hspace{-1.00006pt}V}$$ Te V protons colliding on gaseous neon targets at rest, corresponding to a nucleon-nucleon centre-of-mass energy $$\\sqrt{s_{\\scriptscriptstyle \\text {NN}}} =68.5\\mathrm{\\,Ge\\hspace{-1.00006pt}V} $$ s NN = 68.5 Ge V . The data s le corresponds to an integrated luminosity of $$21.7\\pm 1.4 $$ 21.7 ± 1.4 nb $$^{-1}$$ - 1 . The $${{J} \\hspace{-1.66656pt}/\\hspace{-1.111pt}\\psi }$$ J / ψ and $$\\psi {(2S)}$$ ψ ( 2 S ) hadrons are reconstructed in $$\\mu ^+$$ μ + $$\\mu ^-$$ μ - final states. The $${{J} \\hspace{-1.66656pt}/\\hspace{-1.111pt}\\psi }$$ J / ψ production cross-section per target nucleon in the centre-of-mass rapidity range $$y^\\star \\in [-2.29, 0]$$ y ⋆ ∈ [ - 2.29 , 0 ] is found to be $$506 \\pm 8 \\pm 46 \\text { nb/nucleon}$$ 506 ± 8 ± 46 nb/nucleon . The ratio of $${{J} \\hspace{-1.66656pt}/\\hspace{-1.111pt}\\psi }$$ J / ψ and $$D^0$$ D 0 cross-sections is evaluated to $$(1.06 \\pm 0.02 \\pm 0.09)\\%$$ ( 1.06 ± 0.02 ± 0.09 ) % . The $$\\psi {(2S)}$$ ψ ( 2 S ) to $${{J} \\hspace{-1.66656pt}/\\hspace{-1.111pt}\\psi }$$ J / ψ relative production rate is found to be $$(1.67 \\pm 0.27\\pm 0.10)\\%$$ ( 1.67 ± 0.27 ± 0.10 ) % in good agreement with other measurements involving beam and target nuclei of similar sizes.
Publisher: American Physical Society (APS)
Date: 04-08-2023
Publisher: American Physical Society (APS)
Date: 29-08-2023
Publisher: American Physical Society (APS)
Date: 06-09-2023
Publisher: Springer Science and Business Media LLC
Date: 08-2020
Abstract: The decays B + → J / ψπ + π − K + are studied using a data set corresponding to an integrated luminosity of 9 fb − 1 collected with the LHCb detector in proton-proton collisions between 2011 and 2018. Precise measurements of the ratios of branching fractions with the intermediate ψ 2 (3823), χ c1 (3872) and ψ(2S) states are reported. The values are $$ {\\displaystyle \\begin{array}{c}\\frac{{\\mathcal{B}}_{{\\mathrm{B}}^{+}\\to {\\uppsi}_2(3823){\\mathrm{K}}^{+}}\\times {\\mathcal{B}}_{\\uppsi_2(3823)\\to \\mathrm{J}/{\\uppsi \\uppi}^{+}{\\uppi}^{-}}}{{\\mathcal{B}}_{{\\mathrm{B}}^{+}\\to {\\upchi}_{\\mathrm{c}1}(3872){\\mathrm{K}}^{+}}\\times {\\mathcal{B}}_{\\upchi_{\\mathrm{c}1}(3872)\\to \\mathrm{J}/{\\uppsi \\uppi}^{+}{\\uppi}^{-}}}=\\left(3.56\\pm 0.67\\pm 0.11\\right)\\times {10}^{-2},\\\\ {}\\frac{{\\mathcal{B}}_{{\\mathrm{B}}^{+}\\to {\\uppsi}_2(3823){\\mathrm{K}}^{+}}\\times {\\mathcal{B}}_{\\uppsi_2(3823)\\to \\mathrm{J}/{\\uppsi \\uppi}^{+}{\\uppi}^{-}}}{{\\mathcal{B}}_{{\\mathrm{B}}^{+}\\to \\uppsi \\left(2\\mathrm{S}\\right){\\mathrm{K}}^{+}}\\times {\\mathcal{B}}_{\\uppsi \\left(2\\mathrm{S}\\right)\\to \\mathrm{J}/{\\uppsi \\uppi}^{+}{\\uppi}^{-}}}=\\left(1.31\\pm 0.25\\pm 0.04\\right)\\times {10}^{-3},\\\\ {}\\frac{{\\mathcal{B}}_{\\mathrm{B}+\\to {\\upchi}_{\\mathrm{c}1}(3872){\\mathrm{K}}^{+}}\\times {\\mathcal{B}}_{\\upchi_{\\mathrm{c}1}(3872)\\to \\mathrm{J}/{\\uppsi \\uppi}^{+}{\\uppi}^{-}}}{{\\mathcal{B}}_{{\\mathrm{B}}^{+}\\to \\uppsi \\left(2\\mathrm{S}\\right){\\mathrm{K}}^{+}}\\times {\\mathcal{B}}_{\\uppsi \\left(2\\mathrm{S}\\right)\\to \\mathrm{J}/{\\uppsi \\uppi}^{+}{\\uppi}^{-}}}=\\left(3.69\\pm 0.07\\pm 0.06\\right)\\times {10}^{-2},\\end{array}} $$ B B + → ψ 2 3823 K + × B ψ 2 3823 → J / ψπ + π − B B + → χ c 1 3872 K + × B χ c 1 3872 → J / ψπ + π − = 3.56 ± 0.67 ± 0.11 × 10 − 2 , B B + → ψ 2 3823 K + × B ψ 2 3823 → J / ψπ + π − B B + → ψ 2 S K + × B ψ 2 S → J / ψπ + π − = 1.31 ± 0.25 ± 0.04 × 10 − 3 , B B + → χ c 1 3872 K + × B χ c 1 3872 → J / ψπ + π − B B + → ψ 2 S K + × B ψ 2 S → J / ψπ + π − = 3.69 ± 0.07 ± 0.06 × 10 − 2 , where the first uncertainty is statistical and the second is systematic. The decay of B + → ψ 2 (3823)K + with ψ 2 (3823) → J / ψπ + π − is observed for the first time with a significance of 5.1 standard deviations. The mass differences between the ψ 2 (3823), χ c1 (3872) and ψ(2S) states are measured to be $$ {\\displaystyle \\begin{array}{c}{m}_{\\upchi_{\\mathrm{c}1}(3872)}-{m}_{\\uppsi_2(3823)}=47.50\\pm 0.53\\pm 0.13\\ \\mathrm{MeV}/{c}^2,\\\\ {}{m}_{\\uppsi_2(3823)}-{m}_{\\uppsi_2\\left(2\\mathrm{S}\\right)}=137.98\\pm 0.53\\pm 0.14\\ \\mathrm{MeV}/{c}^2,\\\\ {}{m}_{\\upchi_{\\mathrm{c}1}(3872)}-{m}_{\\uppsi_2\\left(2\\mathrm{S}\\right)}=185.49\\pm 0.06\\pm 0.03\\ \\mathrm{MeV}/{c}^2,\\end{array}} $$ m χ c 1 3872 − m ψ 2 3823 = 47.50 ± 0.53 ± 0.13 MeV / c 2 , m ψ 2 3823 − m ψ 2 2 S = 137.98 ± 0.53 ± 0.14 MeV / c 2 , m χ c 1 3872 − m ψ 2 2 S = 185.49 ± 0.06 ± 0.03 MeV / c 2 , resulting in the most precise determination of the χ c1 (3872) mass. The width of the ψ 2 (3823) state is found to be below 5.2 MeV at 90% confidence level. The Breit-Wigner width of the χ c1 (3872) state is measured to be $$ {\\Gamma}_{\\upchi_{\\mathrm{c}1}(3872)}^{\\mathrm{BW}}={0.96}_{-0.18}^{+0.19}\\pm 0.21\\ \\mathrm{MeV} $$ Γ χ c 1 3872 BW = 0.96 − 0.18 + 0.19 ± 0.21 MeV which is inconsistent with zero by 5.5 standard deviations.
Publisher: American Physical Society (APS)
Date: 06-09-2023
Publisher: American Physical Society (APS)
Date: 13-07-2023
Publisher: American Physical Society (APS)
Date: 14-07-2023
Publisher: American Physical Society (APS)
Date: 28-07-2023
Publisher: American Physical Society (APS)
Date: 27-07-2023
Publisher: American Physical Society (APS)
Date: 26-07-2023
Publisher: American Physical Society (APS)
Date: 14-08-2023
Publisher: American Physical Society (APS)
Date: 28-07-0154
Publisher: Springer Science and Business Media LLC
Date: 17-07-2023
DOI: 10.1140/EPJC/S10052-023-11634-4
Abstract: Using a proton–proton collision data s le collected by the LHCb detector and corresponding to an integrated luminosity of $$5.7~\\text {fb}^{-1}$$ 5.7 fb - 1 , the lifetime of the light $${{B} ^0_{s}} $$ B s 0 mass eigenstate, $$\\tau _{L}$$ τ L , is measured using the $$B^0_s \\rightarrow J/\\psi \\eta $$ B s 0 → J / ψ η decay mode to be $$\\begin{aligned} \\tau _{\\text {L}} = 1.445 \\pm 0.016 \\text {(stat)} \\pm 0.008 \\text {(syst)} \\,\\text {ps}. \\end{aligned}$$ τ L = 1.445 ± 0.016 (stat) ± 0.008 (syst) ps . A combination of this result with a previous LHCb analysis using an independent dataset corresponding to 3 fb $$^{-1}$$ - 1 of integrated luminosity gives $$\\begin{aligned} \\tau _{\\text {L}} = 1.452 \\pm 0.014 \\pm 0.007 \\pm 0.002 \\,\\text {ps}, \\end{aligned}$$ τ L = 1.452 ± 0.014 ± 0.007 ± 0.002 ps , where the first uncertainty is statistical, the second due to the uncorrelated part of the systematic uncertainty and the third due to the correlated part of the systematic uncertainty.
Publisher: American Physical Society (APS)
Date: 27-07-2023
Publisher: American Physical Society (APS)
Date: 10-08-2023
Publisher: American Physical Society (APS)
Date: 27-07-2023
Publisher: American Physical Society (APS)
Date: 14-08-2023
Publisher: American Physical Society (APS)
Date: 24-07-2023
Publisher: American Physical Society (APS)
Date: 08-08-2023
Publisher: American Physical Society (APS)
Date: 27-07-2023
Publisher: American Physical Society (APS)
Date: 20-07-2023
Publisher: Springer Science and Business Media LLC
Date: 27-06-2023
DOI: 10.1140/EPJC/S10052-023-11673-X
Abstract: The interpretation of cosmic antiproton flux measurements from space-borne experiments is currently limited by the knowledge of the antiproton production cross-section in collisions between primary cosmic rays and the interstellar medium. Using collisions of protons with an energy of 6.5 $$\\,\\text {Te\\hspace{-1.00006pt}V}$$ Te V incident on helium nuclei at rest in the proximity of the interaction region of the LHCb experiment, the ratio of antiprotons originating from antihyperon decays to prompt production is measured for antiproton momenta between 12 and $$110\\,\\text {Ge\\hspace{-1.00006pt}V\\!/}c $$ 110 Ge V\\!/ c . The dominant antihyperon contribution, namely $${\\overline{\\varLambda }} \\rightarrow {\\overline{{p}}} {{\\pi } ^+} $$ Λ ¯ → p ¯ π + decays from promptly produced $$\\overline{\\varLambda }$$ Λ ¯ particles, is also exclusively measured. The results complement the measurement of prompt antiproton production obtained from the same data s le. At the energy scale of this measurement, the antihyperon contributions to antiproton production are observed to be significantly larger than predictions of commonly used hadronic production models.
Publisher: Springer Science and Business Media LLC
Date: 25-07-2023
DOI: 10.1140/EPJC/S10052-023-11674-W
Abstract: The first measurement of $${{J}/\\psi }$$ J / ψ and $${{D}} ^0$$ D 0 production in PbNe collisions by the LHCb experiment in its fixed-target configuration is reported. The production of $${{J}/\\psi }$$ J / ψ and $${{D}} ^0$$ D 0 mesons is studied with a beam of lead ions with an energy of 2.5 $$\\,\\text {TeV}$$ TeV per nucleon colliding on gaseous neon targets at rest, corresponding to a nucleon-nucleon centre-of-mass energy of $$\\sqrt{s_{\\scriptscriptstyle \\text {NN}}} =68.5\\,\\text {GeV} $$ s NN = 68.5 GeV . The $${{J}/\\psi }$$ J / ψ / $${{D}} ^0$$ D 0 production cross-section ratio is studied as a function of rapidity, transverse momentum and collision centrality. These data are compared with measurements from $$p\\text {Ne}$$ p Ne collisions at the same energy and show no difference in the observed $${{J}/\\psi }$$ J / ψ suppression trend when comparing $$p\\text {Ne}$$ p Ne and PbNe peripheral collisions with PbNe central collisions.
Location: United States of America
No related grants have been discovered for Salvatore Aiola.