ORCID Profile
0000-0001-6280-3851
Current Organisation
Uppsala University
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Publisher: Springer Science and Business Media LLC
Date: 02-01-2202
DOI: 10.1140/EPJC/S10052-023-11759-6
Abstract: The very rare $${{D} ^*} (2007)^0\\!\\rightarrow {\\mu ^+\\mu ^-} $$ D ∗ ( 2007 ) 0 → μ + μ - decay is searched for by analysing $${{{B} ^-}} \\!\\rightarrow {{\\pi } ^-} {\\mu ^+\\mu ^-} $$ B - → π - μ + μ - decays. The analysis uses a s le of beauty mesons produced in proton–proton collisions collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9 $$\\text {\\,fb} ^{-1}$$ \\,fb - 1 . The signal signature corresponds to simultaneous peaks in the $${\\mu ^+\\mu ^-} $$ μ + μ - and $${{\\pi } ^-} {\\mu ^+\\mu ^-} $$ π - μ + μ - invariant masses. No evidence for an excess of events over background is observed and an upper limit is set on the branching fraction of the decay at $$\\mathcal{B}({{D} ^*} (2007)^0\\!\\rightarrow {\\mu ^+\\mu ^-} ) 2.6\\times 10^{-8}$$ B ( D ∗ ( 2007 ) 0 → μ + μ - ) 2.6 × 10 - 8 at $$90\\%$$ 90 % confidence level. This is the first limit on the branching fraction of $${{D} ^*} (2007)^0\\!\\rightarrow {\\mu ^+\\mu ^-} $$ D ∗ ( 2007 ) 0 → μ + μ - decays and the most stringent limit on $${{D} ^*} (2007)^0$$ D ∗ ( 2007 ) 0 decays to leptonic final states. The analysis is the first search for a rare charm-meson decay exploiting production via beauty decays.
Publisher: American Physical Society (APS)
Date: 03-08-2023
Publisher: American Physical Society (APS)
Date: 17-07-2023
Publisher: American Physical Society (APS)
Date: 29-08-2023
Publisher: American Physical Society (APS)
Date: 29-08-2023
Publisher: Springer Science and Business Media LLC
Date: 29-06-2023
DOI: 10.1140/EPJC/S10052-023-11560-5
Abstract: The first study of $$C\\!P$$ C P violation in the decay mode $${{B} ^\\pm } \\rightarrow [{{K} ^+} {{K} ^-} {{\\uppi } ^+} {{\\uppi } ^-} ]_{D} h^\\pm $$ B ± → [ K + K - π + π - ] D h ± , with $$h=K,\\pi $$ h = K , π , is presented, exploiting a data s le of proton–proton collisions collected by the LHCb experiment that corresponds to an integrated luminosity of $$9\\text {\\,fb} ^{-1} $$ 9 \\,fb - 1 . The analysis is performed in bins of phase space, which are optimised for sensitivity to local $$C\\!P$$ C P asymmetries. $$C\\!P$$ C P -violating observables that are sensitive to the angle $$\\gamma $$ γ of the Unitarity Triangle are determined. The analysis requires external information on charm-decay parameters, which are currently taken from an litude analysis of LHCb data, but can be updated in the future when direct measurements become available. Measurements are also performed of phase-space integrated observables for $${{B} ^\\pm } \\rightarrow [{{K} ^+} {{K} ^-} {{\\uppi } ^+} {{\\uppi } ^-} ]_{D} h^\\pm $$ B ± → [ K + K - π + π - ] D h ± and $${{B} ^\\pm } \\rightarrow [{{\\uppi } ^+} {{\\uppi } ^-} {{\\uppi } ^+} {{\\uppi } ^-} ]_{D} h^\\pm $$ B ± → [ π + π - π + π - ] D h ± decays.
Publisher: American Physical Society (APS)
Date: 26-09-2023
Publisher: American Physical Society (APS)
Date: 26-09-2023
Publisher: American Physical Society (APS)
Date: 18-09-2023
Publisher: American Physical Society (APS)
Date: 27-07-2023
Publisher: American Physical Society (APS)
Date: 26-07-2023
Publisher: American Physical Society (APS)
Date: 23-10-2023
Publisher: American Physical Society (APS)
Date: 23-10-2023
Publisher: American Physical Society (APS)
Date: 27-07-2023
Publisher: American Physical Society (APS)
Date: 17-08-2023
Publisher: American Physical Society (APS)
Date: 02-08-2023
Publisher: American Physical Society (APS)
Date: 13-09-2023
Publisher: Springer Science and Business Media LLC
Date: 28-07-2023
Publisher: American Physical Society (APS)
Date: 27-07-2023
Publisher: American Physical Society (APS)
Date: 27-07-2023
Publisher: American Physical Society (APS)
Date: 10-10-2023
Publisher: American Physical Society (APS)
Date: 02-08-2023
Publisher: Elsevier BV
Date: 06-2018
Publisher: Springer Science and Business Media LLC
Date: 08-08-2023
Publisher: Springer Science and Business Media LLC
Date: 27-06-2023
DOI: 10.1140/EPJC/S10052-023-11641-5
Abstract: A measurement of $${{D}} ^0$$ D 0 meson production by the LHCb experiment in its fixed-target configuration is presented. The production of $${{D}} ^0$$ D 0 mesons is studied with a beam of 2.5 $$\\,\\text {Te\\hspace{-1.00006pt}V}$$ Te V protons colliding on a gaseous neon target at rest, corresponding to a nucleon–nucleon centre-of-mass energy of $$\\sqrt{s_{\\scriptscriptstyle \\text {NN}}} = 68.5\\,\\,\\text {Ge\\hspace{-1.00006pt}V} $$ s NN = 68.5 Ge V . The sum of the $${{D}} ^0$$ D 0 and $${\\hspace{0.0pt}\\overline{\\hspace{0.0pt}{D}}} {}^0$$ D ¯ 0 production cross-section in $$p\\text {Ne}$$ p Ne collisions in the centre-of-mass rapidity range $$y^{\\star }\\in [-2.29, 0]$$ y ⋆ ∈ [ - 2.29 , 0 ] is found to be $$\\sigma _{D^{0}}^{y^\\star \\in [-2.29, 0]} = 48.2 \\pm 0.3 \\pm 4.5 \\,\\upmu \\text {b}/\\text {nucleon}$$ σ D 0 y ⋆ ∈ [ - 2.29 , 0 ] = 48.2 ± 0.3 ± 4.5 μ b / nucleon where the first uncertainty is statistical and the second is systematic. The $${{{D}} ^0}-{{\\hspace{0.0pt}\\overline{\\hspace{0.0pt}{D}}} {}^0} $$ D 0 - D ¯ 0 production asymmetry is also evaluated and suggests a trend towards negative values at large negative $$y^{\\star }$$ y ⋆ . The considered models do not account precisely for all the features observed in the LHCb data, but theoretical predictions including 1 $$\\%$$ % intrinsic charm and 10 $$\\%$$ % recombination contributions better describe the data than the other models considered.
No related grants have been discovered for Patrik Adlarson.