Precision measurement of the B0 meson lifetime using B0 → J/ψ K∗0 decays with the ATLAS detector
A measurement of the B0 meson lifetime using B0 → J[Lambda][psi]K*0 decays in data from 13 TeV proton-proton collisions with an integrated luminosity of 140fb -1 recorded by the ATLAS detector at the LHC is presented. The measured effective lifetime is $$ \tau = 1.5053\pm 0.0012~\mathrm {(stat.)} \p...
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| Autori principali: | , , , , , , , , , , , , , , , , , , , |
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| Ente Autore: | |
| Natura: | Article (Journal) |
| Lingua: | inglese |
| Pubblicazione: |
03 July 2025
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| In: |
The European physical journal. C, Particles and fields
Year: 2025, Volume: 85, Fascicolo: 7, Pages: 1-27 |
| ISSN: | 1434-6052 |
| DOI: | 10.1140/epjc/s10052-025-14232-8 |
| Accesso online: | Verlag, kostenfrei, Volltext: https://doi.org/10.1140/epjc/s10052-025-14232-8
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| Note sull'autore: | ATLAS Collaboration* |
| Riassunto: | A measurement of the B0 meson lifetime using B0 → J[Lambda][psi]K*0 decays in data from 13 TeV proton-proton collisions with an integrated luminosity of 140fb -1 recorded by the ATLAS detector at the LHC is presented. The measured effective lifetime is $$ \tau = 1.5053\pm 0.0012~\mathrm {(stat.)} \pm 0.0035~\mathrm {(syst.)~ps}. $$τ=1.5053±0.0012(stat.)±0.0035(syst.)ps.The average decay width extracted from the effective lifetime, using parameters from external sources, is $$\begin{aligned} \Gamma _d = 0.6639\pm 0.0005~\mathrm {(stat.)} \pm 0.0016~\mathrm {(syst.)}\\ \pm 0.0038~\text {(ext.)} \text {~ps}^{-1}, \end{aligned}$$Γd=0.6639±0.0005(stat.)±0.0016(syst.)±0.0038(ext.)ps-1,where the uncertainties are statistical, systematic and from external sources. The earlier ATLAS measurement of $$\Gamma _s$$in the $$B^{0}_{s} \rightarrow J/\psi \phi $$decay was used to derive a value for the ratio of the average decay widths $$\Gamma _d$$and $$\Gamma _s$$for $$B^{0} $$and $$B^{0}_{s} $$mesons respectively, of $$ \frac{\Gamma _d }{\Gamma _s } = 0.9905\pm 0.0022~\text {(stat.)} \pm 0.0036~\text {(syst.)} \pm 0.0057~\text {(ext.)}. $$ΓdΓs=0.9905±0.0022(stat.)±0.0036(syst.)±0.0057(ext.).The measured lifetime, average decay width and decay width ratio are in agreement with theoretical predictions and with measurements by other experiments. This measurement provides the most precise result of the effective lifetime of the $$B^{0}$$meson to date. |
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| Descrizione del documento: | Im Titel ist der Stern und die Zahl 0 jeweils hochgestellt Online veröffentlicht: 03. Juli 2025 *ATLAS Collaboration: G. Aad, A. Ackermann, L.M. Baltes, F. Bartels, S.J. Dittmeier, M. Dunford, S. Franchino, T. Junkermann, T. Mkrtchyan, D.F. Rassloff, L. Sanfilippo, C. Sauer, A. Schoening, H.-C. Schultz-Coulon, V. Sothilingam, R. Stamen, P. Starovoitov, L. Vigani, M. Wessels, J. Zinsser [und sehr viele weitere Personen] Gesehen am 22.04.2026 Im Titel ist [ast] als Tropfensternchen dargestellt Im Titel sind die Zahlen 0 und das Tropfensternchen hochgestellt |
| Descrizione fisica: | Online Resource |
| ISSN: | 1434-6052 |
| DOI: | 10.1140/epjc/s10052-025-14232-8 |