Measurement of the CP-violating phase φs in B0 s → J/ψφ decays in ATLAS at 13 TeV

ATLAS Publications; M. Faucci Giannelli; A. Hasib; M.P. Heath; X. Hoad; S. Palazzo; A. Søgaard; A. Strubig; E.P. Takeva; A.J. Taylor; A. Washbrook

doi:10.1140/epjc/s10052-021-09011-0

Measurement of the CP-violating phase φs in B0 s → J/ψφ decays in ATLAS at 13 TeV

ATLAS Publications, M. Faucci Giannelli, A. Hasib, M.P. Heath, X. Hoad, S. Palazzo, A. Søgaard, A. Strubig, E.P. Takeva, A.J. Taylor, A. Washbrook

School of Physics and Astronomy

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Abstract

A measurement of the B0s → J/ψφ decayparameters using 80.5 fb−1 of integrated luminosity collected with the ATLAS detector from 13 TeV proton–proton collisions at the LHC is presented. The measured parameters include the CP-violating phase φs , the width difference s between the B0
s meson mass eigenstates and the average decay width s . The values measured for the physical parameters are combined with those from 19.2 fb−1 of 7 and 8 TeV data, leading to the following: φs = −0.087 ± 0.036 (stat.) ± 0.021 (syst.) rad s = 0.0657 ± 0.0043 (stat.) ± 0.0037 (syst.) ps−1
s = 0.6703 ± 0.0014 (stat.) ± 0.0018 (syst.) ps−1
Results for φs and s are also presented as 68% confi-
dence level contours in the φs –s plane. Furthermore the
transversity amplitudes and corresponding strong phases are
measured. φs and s measurements are in agreement with
the Standard Model predictions.

Original language	English
Article number	342
Pages (from-to)	1-36
Number of pages	36
Journal	The European Physical Journal C
Volume	81
Issue number	4
DOIs	https://doi.org/10.1140/epjc/s10052-021-09011-0
Publication status	Published - 21 Apr 2021

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10.1140/epjc/s10052-021-09011-0Licence: Creative Commons: Attribution (CC-BY)

http://arxiv.org/abs/2001.07115

1 Active
5 Finished

Upgrade of the ATLAS detector at the LHC (2023-26)
Clark, P. (Principal Investigator)
1/04/23 → 31/03/26
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
1/04/23 → 30/09/25
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
1/10/22 → 30/09/25
Project: Research

Cite this

@article{7ef4fa9365a54f6cbe6eeebfac6708c5,

title = "Measurement of the CP-violating phase φs in B0 s → J/ψφ decays in ATLAS at 13 TeV",

abstract = "A measurement of the B0s → J/ψφ decayparameters using 80.5 fb−1 of integrated luminosity collected with the ATLAS detector from 13 TeV proton–proton collisions at the LHC is presented. The measured parameters include the CP-violating phase φs , the width difference s between the B0 s meson mass eigenstates and the average decay width s . The values measured for the physical parameters are combined with those from 19.2 fb−1 of 7 and 8 TeV data, leading to the following: φs = −0.087 ± 0.036 (stat.) ± 0.021 (syst.) rad s = 0.0657 ± 0.0043 (stat.) ± 0.0037 (syst.) ps−1 s = 0.6703 ± 0.0014 (stat.) ± 0.0018 (syst.) ps−1 Results for φs and s are also presented as 68\% confi- dence level contours in the φs –s plane. Furthermore the transversity amplitudes and corresponding strong phases are measured. φs and s measurements are in agreement with the Standard Model predictions.",

author = "\{ATLAS Publications\} and Clark, \{Philip James\} and Sinead Farrington and Yanyan Gao and Christos Leonidopoulos and Martin, \{Victoria Jane\} and Liza Mijovic and Benjamin Wynne and \{Faucci Giannelli\}, M. and A. Hasib and M.P. Heath and X. Hoad and S. Palazzo and A. S{\o}gaard and A. Strubig and E.P. Takeva and A.J. Taylor and A. Washbrook",

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doi = "10.1140/epjc/s10052-021-09011-0",

language = "English",

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pages = "1--36",

journal = "The European Physical Journal C",

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TY - JOUR

T1 - Measurement of the CP-violating phase φs in B0 s → J/ψφ decays in ATLAS at 13 TeV

AU - ATLAS Publications

AU - Clark, Philip James

AU - Farrington, Sinead

AU - Gao, Yanyan

AU - Leonidopoulos, Christos

AU - Martin, Victoria Jane

AU - Mijovic, Liza

AU - Wynne, Benjamin

AU - Faucci Giannelli, M.

AU - Hasib, A.

AU - Heath, M.P.

AU - Hoad, X.

AU - Palazzo, S.

AU - Søgaard, A.

AU - Strubig, A.

AU - Takeva, E.P.

AU - Taylor, A.J.

AU - Washbrook, A.

PY - 2021/4/21

Y1 - 2021/4/21

N2 - A measurement of the B0s → J/ψφ decayparameters using 80.5 fb−1 of integrated luminosity collected with the ATLAS detector from 13 TeV proton–proton collisions at the LHC is presented. The measured parameters include the CP-violating phase φs , the width difference s between the B0 s meson mass eigenstates and the average decay width s . The values measured for the physical parameters are combined with those from 19.2 fb−1 of 7 and 8 TeV data, leading to the following: φs = −0.087 ± 0.036 (stat.) ± 0.021 (syst.) rad s = 0.0657 ± 0.0043 (stat.) ± 0.0037 (syst.) ps−1 s = 0.6703 ± 0.0014 (stat.) ± 0.0018 (syst.) ps−1 Results for φs and s are also presented as 68% confi- dence level contours in the φs –s plane. Furthermore the transversity amplitudes and corresponding strong phases are measured. φs and s measurements are in agreement with the Standard Model predictions.

AB - A measurement of the B0s → J/ψφ decayparameters using 80.5 fb−1 of integrated luminosity collected with the ATLAS detector from 13 TeV proton–proton collisions at the LHC is presented. The measured parameters include the CP-violating phase φs , the width difference s between the B0 s meson mass eigenstates and the average decay width s . The values measured for the physical parameters are combined with those from 19.2 fb−1 of 7 and 8 TeV data, leading to the following: φs = −0.087 ± 0.036 (stat.) ± 0.021 (syst.) rad s = 0.0657 ± 0.0043 (stat.) ± 0.0037 (syst.) ps−1 s = 0.6703 ± 0.0014 (stat.) ± 0.0018 (syst.) ps−1 Results for φs and s are also presented as 68% confi- dence level contours in the φs –s plane. Furthermore the transversity amplitudes and corresponding strong phases are measured. φs and s measurements are in agreement with the Standard Model predictions.

U2 - 10.1140/epjc/s10052-021-09011-0

DO - 10.1140/epjc/s10052-021-09011-0

M3 - Article

SN - 1434-6052

VL - 81

SP - 1

EP - 36

JO - The European Physical Journal C

JF - The European Physical Journal C

IS - 4

M1 - 342

ER -

Measurement of the CP-violating phase φs in B0 s → J/ψφ decays in ATLAS at 13 TeV

Abstract

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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

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