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

ATLAS Collaboration; S. Alderweireldt; J.F. Allen; T.M. Carter; P. J.  Clark; D. Duda; S. M. Farrington; Y. Gao; C. Jiang; C. Leonidopoulos; M. Firdaus M. Soberi; V. J.  Martin; L. Mijović; V.A. Parrish; E.A. Pender; T. Qiu; J.M. Silva; N. Themistokleous; F. Ustuner; E.M. Villhauer; Z. Xu; E. Zaid

doi:10.1140/epjc/s10052-025-14232-8

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

ATLAS Collaboration, S. Alderweireldt, J.F. Allen, T.M. Carter, P. J. Clark, D. Duda, S. M. Farrington, Y. Gao, C. Jiang, C. Leonidopoulos, M. Firdaus M. Soberi, V. J. Martin, L. Mijović, V.A. Parrish, E.A. Pender, T. Qiu, J.M. Silva, N. Themistokleous, F. Ustuner, E.M. VillhauerZ. Xu, E. Zaid

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

A measurement of the B0 meson lifetime using B0 → 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 τd = 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 τs in
the B0s → J/ψφ decay was used to derive a value for the ratio of the average decay widths τd and τs for B0 and B0s mesons respectively, of τd-τs = 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 B0 meson to date.

Original language	English
Article number	736
Pages (from-to)	1-27
Number of pages	27
Journal	The European Physical Journal C
Volume	85
Issue number	7
DOIs	https://doi.org/10.1140/epjc/s10052-025-14232-8
Publication status	Published - 3 Jul 2025

Access to Document

10.1140/epjc/s10052-025-14232-8Licence: Creative Commons: Attribution (CC-BY)

3 Finished
3 Active

Upgrade of the ATLAS detector at the LHC (2023-26)
Clark, P. (Principal Investigator)
Science and Technology Facilities Council
1/04/23 → 31/03/27
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
Science and Technology Facilities Council
1/04/23 → 30/09/26
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
Science and Technology Facilities Council
1/10/22 → 30/09/26
Project: Research

Cite this

ATLAS Collaboration, Alderweireldt, S., Allen, J. F., Carter, T. M., Clark, P. J., Duda, D., Farrington, S. M., Gao, Y., Jiang, C., Leonidopoulos, C., Soberi, M. F. M., Martin, V. J., Mijović, L., Parrish, V. A., Pender, E. A., Qiu, T., Silva, J. M., Themistokleous, N., Ustuner, F., ... Zaid, E. (2025). Precision measurement of the B0 meson lifetime using B0 → J/ψ K ∗0 decays with the ATLAS detector. The European Physical Journal C, 85(7), 1-27. Article 736. https://doi.org/10.1140/epjc/s10052-025-14232-8

@article{5fcd8f2ecf294f6bbc544b7d31a78923,

title = "Precision measurement of the B0 meson lifetime using B0 → J/ψ K ∗0 decays with the ATLAS detector",

abstract = "A measurement of the B0 meson lifetime using B0 → 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 τd = 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 τs in the B0s → J/ψφ decay was used to derive a value for the ratio of the average decay widths τd and τs for B0 and B0s mesons respectively, of τd-τs = 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 B0 meson to date.",

author = "\{ATLAS Collaboration\} and S. Alderweireldt and J.F. Allen and T.M. Carter and Clark, \{P. J.\} and D. Duda and Farrington, \{S. M.\} and Y. Gao and C. Jiang and C. Leonidopoulos and Soberi, \{M. Firdaus M.\} and Martin, \{V. J.\} and L. Mijovi{\'c} and V.A. Parrish and E.A. Pender and T. Qiu and J.M. Silva and N. Themistokleous and F. Ustuner and E.M. Villhauer and Z. Xu and E. Zaid",

year = "2025",

month = jul,

day = "3",

doi = "10.1140/epjc/s10052-025-14232-8",

language = "English",

volume = "85",

pages = "1--27",

journal = "The European Physical Journal C",

issn = "1434-6044",

publisher = "Springer Nature",

number = "7",

}

ATLAS Collaboration, Alderweireldt, S, Allen, JF, Carter, TM, Clark, PJ , Duda, D , Farrington, SM , Gao, Y, Jiang, C, Leonidopoulos, C, Soberi, MFM, Martin, VJ , Mijović, L, Parrish, VA, Pender, EA, Qiu, T , Silva, JM, Themistokleous, N, Ustuner, F, Villhauer, EM, Xu, Z & Zaid, E 2025, 'Precision measurement of the B0 meson lifetime using B0 → J/ψ K ∗0 decays with the ATLAS detector', The European Physical Journal C, vol. 85, no. 7, 736, pp. 1-27. https://doi.org/10.1140/epjc/s10052-025-14232-8

TY - JOUR

T1 - Precision measurement of the B0 meson lifetime using B0 → J/ψ K ∗0 decays with the ATLAS detector

AU - ATLAS Collaboration

AU - Alderweireldt, S.

AU - Allen, J.F.

AU - Carter, T.M.

AU - Clark, P. J.

AU - Duda, D.

AU - Farrington, S. M.

AU - Gao, Y.

AU - Jiang, C.

AU - Leonidopoulos, C.

AU - Soberi, M. Firdaus M.

AU - Martin, V. J.

AU - Mijović, L.

AU - Parrish, V.A.

AU - Pender, E.A.

AU - Qiu, T.

AU - Silva, J.M.

AU - Themistokleous, N.

AU - Ustuner, F.

AU - Villhauer, E.M.

AU - Xu, Z.

AU - Zaid, E.

PY - 2025/7/3

Y1 - 2025/7/3

N2 - A measurement of the B0 meson lifetime using B0 → 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 τd = 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 τs in the B0s → J/ψφ decay was used to derive a value for the ratio of the average decay widths τd and τs for B0 and B0s mesons respectively, of τd-τs = 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 B0 meson to date.

AB - A measurement of the B0 meson lifetime using B0 → 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 τd = 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 τs in the B0s → J/ψφ decay was used to derive a value for the ratio of the average decay widths τd and τs for B0 and B0s mesons respectively, of τd-τs = 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 B0 meson to date.

U2 - 10.1140/epjc/s10052-025-14232-8

DO - 10.1140/epjc/s10052-025-14232-8

M3 - Article

SN - 1434-6044

VL - 85

SP - 1

EP - 27

JO - The European Physical Journal C

JF - The European Physical Journal C

IS - 7

M1 - 736

ER -

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

Abstract

Access to Document

Fingerprint

Projects

Upgrade of the ATLAS detector at the LHC (2023-26)

Experimental Particle Physics at the University of Edinburgh

Experimental Particle Physics at the University of Edinburgh

Cite this