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Precision measurement of the B0 meson lifetime using B0→J/ψK∗0 decays with the ATLAS detector.

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Title: Precision measurement of the B0 meson lifetime using B0→J/ψK∗0 decays with the ATLAS detector.
Authors: ATLAS Collaboration (AUTHOR), Aad, G.1 (AUTHOR), Aakvaag, E.2 (AUTHOR), Abbott, B.3 (AUTHOR), Abdelhameed, S.4 (AUTHOR), Abeling, K.5 (AUTHOR), Abicht, N. J.6 (AUTHOR), Abidi, S. H.7 (AUTHOR), Aboelela, M.8 (AUTHOR), Aboulhorma, A.9 (AUTHOR), Abramowicz, H.10 (AUTHOR), Abreu, H.11 (AUTHOR), Abulaiti, Y.12 (AUTHOR), Acharya, B. S.13,14,15 (AUTHOR), Ackermann, A.16 (AUTHOR), Bourdarios, C. Adam17 (AUTHOR), Adamczyk, L.18 (AUTHOR), Addepalli, S. V.19 (AUTHOR), Addison, M. J.20 (AUTHOR), Adelman, J.21 (AUTHOR)
Source: European Physical Journal C -- Particles & Fields. Jul2025, Vol. 85 Issue 7, p1-27. 27p.
Subjects: Mesons, Meson decay, Particle detectors, Units of time, Empirical research, Proton-proton interactions, Decay constants, Large Hadron Collider
Abstract: A measurement of the B 0 meson lifetime using B 0 → J / ψ K ∗ 0 decays in data from 13 TeV proton–proton collisions with an integrated luminosity of 140 fb - 1 recorded by the ATLAS detector at the LHC is presented. The measured effective lifetime is τ = 1.5053 ± 0.0012 (stat.) ± 0.0035 (syst.) ps. The average decay width extracted from the effective lifetime, using parameters from external sources, is Γ d = 0.6639 ± 0.0005 (stat.) ± 0.0016 (syst.) ± 0.0038 (ext.) ps - 1 , where the uncertainties are statistical, systematic and from external sources. The earlier ATLAS measurement of Γ s in the B s 0 → J / ψ ϕ decay was used to derive a value for the ratio of the average decay widths Γ d and Γ s for B 0 and B s 0 mesons respectively, of Γ d Γ s = 0.9905 ± 0.0022 (stat.) ± 0.0036 (syst.) ± 0.0057 (ext.). The measured lifetime, average decay width and decay width ratio are in agreement with theoretical predictions and with measurements by other experiments. This measurement provides the most precise result of the effective lifetime of the B 0 meson to date. [ABSTRACT FROM AUTHOR]
Copyright of European Physical Journal C -- Particles & Fields is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Precision measurement of the B0 meson lifetime using B0→J/ψK∗0 decays with the ATLAS detector.
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  Data: <searchLink fieldCode="AR" term="%22ATLAS Collaboration%22">ATLAS Collaboration</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Aad%2C+G%2E%22">Aad, G.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Aakvaag%2C+E%2E%22">Aakvaag, E.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abbott%2C+B%2E%22">Abbott, B.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abdelhameed%2C+S%2E%22">Abdelhameed, S.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abeling%2C+K%2E%22">Abeling, K.</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abicht%2C+N%2E+J%2E%22">Abicht, N. J.</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abidi%2C+S%2E+H%2E%22">Abidi, S. H.</searchLink><relatesTo>7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Aboelela%2C+M%2E%22">Aboelela, M.</searchLink><relatesTo>8</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Aboulhorma%2C+A%2E%22">Aboulhorma, A.</searchLink><relatesTo>9</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abramowicz%2C+H%2E%22">Abramowicz, H.</searchLink><relatesTo>10</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abreu%2C+H%2E%22">Abreu, H.</searchLink><relatesTo>11</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abulaiti%2C+Y%2E%22">Abulaiti, Y.</searchLink><relatesTo>12</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Acharya%2C+B%2E+S%2E%22">Acharya, B. S.</searchLink><relatesTo>13,14,15</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ackermann%2C+A%2E%22">Ackermann, A.</searchLink><relatesTo>16</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bourdarios%2C+C%2E+Adam%22">Bourdarios, C. Adam</searchLink><relatesTo>17</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Adamczyk%2C+L%2E%22">Adamczyk, L.</searchLink><relatesTo>18</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Addepalli%2C+S%2E+V%2E%22">Addepalli, S. V.</searchLink><relatesTo>19</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Addison%2C+M%2E+J%2E%22">Addison, M. J.</searchLink><relatesTo>20</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Adelman%2C+J%2E%22">Adelman, J.</searchLink><relatesTo>21</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22European+Physical+Journal+C+--+Particles+%26+Fields%22">European Physical Journal C -- Particles & Fields</searchLink>. Jul2025, Vol. 85 Issue 7, p1-27. 27p.
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  Data: A measurement of the B 0 meson lifetime using B 0 → J / ψ K ∗ 0 decays in data from 13 TeV proton–proton collisions with an integrated luminosity of 140 fb - 1 recorded by the ATLAS detector at the LHC is presented. The measured effective lifetime is τ = 1.5053 ± 0.0012 (stat.) ± 0.0035 (syst.) ps. The average decay width extracted from the effective lifetime, using parameters from external sources, is Γ d = 0.6639 ± 0.0005 (stat.) ± 0.0016 (syst.) ± 0.0038 (ext.) ps - 1 , where the uncertainties are statistical, systematic and from external sources. The earlier ATLAS measurement of Γ s in the B s 0 → J / ψ ϕ decay was used to derive a value for the ratio of the average decay widths Γ d and Γ s for B 0 and B s 0 mesons respectively, of Γ d Γ s = 0.9905 ± 0.0022 (stat.) ± 0.0036 (syst.) ± 0.0057 (ext.). The measured lifetime, average decay width and decay width ratio are in agreement with theoretical predictions and with measurements by other experiments. This measurement provides the most precise result of the effective lifetime of the B 0 meson to date. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of European Physical Journal C -- Particles & Fields is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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