Measurement of the weak mixing phase ϕs through time-dependent CP-violation in Bs0 → J/ψϕ decays in the ATLAS detector

2020 ◽  
Vol 35 (34n35) ◽  
pp. 2044006
Author(s):  
Vladimir Nikolaenko
Keyword(s):  
Cp Violation ◽  
Atlas Detector ◽  
Time Dependent ◽  
Physical Parameters ◽  
Weak Mixing ◽  
Width Difference ◽  
Difference Formula ◽  
8 Tev ◽  
Using Data ◽  
Decay Parameters

A measurement of [Formula: see text] decay parameters using data collected by the ATLAS detector in [Formula: see text] collisions at 13 TeV in 2015–2017 is performed. Integrated luminosity of this sample is 80.5 fb[Formula: see text]. The measurement of physical parameters are statistically combined with results obtained from Run 1 data at 7 and 8 TeV. The measured value of CP-violating phase [Formula: see text] is obtained, which has significantly better precision in comparison with Run 1 result. Precision of other physical parameters is also improved, including the decay width difference [Formula: see text]. Further improvement is expected from the use of full Run 2 statistics, as well as from modifications in the analysis.

scholarly journals CPLEAR data on semileptonic decay of K0, K̄0 and the mass difference of KL0 and KS0 mesons

2015 ◽  
Vol 39 ◽  
pp. 1560101
Author(s):  
Stanislav Dubnicka ◽  
Anna-Zuzana Dubnickova
Keyword(s):  
Cp Violation ◽  
Semileptonic Decay ◽  
Mass Difference ◽  
Time Dependent ◽  
Theoretical Formula ◽  
Difference Formula

It is demonstrated that for a determination of the mass difference of the [Formula: see text] and [Formula: see text] mesons an explicit theoretical formula to be derived by an assumption of the CP-conservation has been used by CPLEAR Collaboration in a fitting of the time-dependent CPLEAR data on ASYMMETRY. So, in such procedure the mass difference [Formula: see text] of the [Formula: see text] and [Formula: see text] mesons has been found and in no case [Formula: see text] one as in this case the CP-violation has to be considered.

scholarly journals Measurement of the CP-violating phase $$\phi _s$$ in $$ B_{s}^{0} \rightarrow J/\psi \phi $$ decays in ATLAS at 13 TeV

2021 ◽  
Vol 81 (4) ◽  
Author(s):  
G. Aad ◽  
◽  
B. Abbott ◽  
D. C. Abbott ◽  
O. Abdinov ◽  
...  
Keyword(s):  
Meson Mass ◽  
Physical Parameters ◽  
Proton Proton ◽  
Proton Collisions ◽  
Width Difference ◽  
The Standard Model ◽  
Model Predictions ◽  
Decay Parameters ◽  
Gamma S ◽  
Proton Proton Collisions

AbstractA measurement of the $$ B_{s}^{0} \rightarrow J/\psi \phi $$ B s 0 → J / ψ ϕ decay parameters using $$ 80.5\, \mathrm {fb^{-1}} $$ 80.5 fb - 1 of integrated luminosity collected with the ATLAS detector from 13 $$\text {Te}\text {V}$$ Te proton–proton collisions at the LHC is presented. The measured parameters include the CP-violating phase $$\phi _{s} $$ ϕ s , the width difference $$ \Delta \Gamma _{s}$$ Δ Γ s between the $$B_{s}^{0}$$ B s 0 meson mass eigenstates and the average decay width $$ \Gamma _{s}$$ Γ s . The values measured for the physical parameters are combined with those from $$ 19.2\, \mathrm {fb^{-1}} $$ 19.2 fb - 1 of 7 and 8 $$\text {Te}\text {V}$$ Te data, leading to the following: $$\begin{aligned} \phi _{s}= & {} -0.087 \pm 0.036 ~\mathrm {(stat.)} \pm 0.021 ~\mathrm {(syst.)~rad} \\ \Delta \Gamma _{s}= & {} 0.0657 \pm 0.0043 ~\mathrm {(stat.)}\pm 0.0037 ~\mathrm {(syst.)~ps}^{-1} \\ \Gamma _{s}= & {} 0.6703 \pm 0.0014 ~\mathrm {(stat.)}\pm 0.0018 ~\mathrm {(syst.)~ps}^{-1} \end{aligned}$$ ϕ s = - 0.087 ± 0.036 ( stat . ) ± 0.021 ( syst . ) rad Δ Γ s = 0.0657 ± 0.0043 ( stat . ) ± 0.0037 ( syst . ) ps - 1 Γ s = 0.6703 ± 0.0014 ( stat . ) ± 0.0018 ( syst . ) ps - 1 Results for $$\phi _{s} $$ ϕ s and $$ \Delta \Gamma _{s}$$ Δ Γ s are also presented as 68% confidence level contours in the $$\phi _{s} $$ ϕ s –$$ \Delta \Gamma _{s}$$ Δ Γ s plane. Furthermore the transversity amplitudes and corresponding strong phases are measured. $$\phi _{s} $$ ϕ s and $$ \Delta \Gamma _{s}$$ Δ Γ s measurements are in agreement with the Standard Model predictions.

scholarly journals Measurement of time-dependent CP violation parameters in B0→KS0KS0KS0 decays at Belle

2021 ◽  
Vol 103 (3) ◽  
Author(s):  
K. H. Kang ◽  
H. Park ◽  
T. Higuchi ◽  
K. Miyabayashi ◽  
K. Sumisawa ◽  
...  
Keyword(s):  
Cp Violation ◽  
Time Dependent

scholarly journals Luminosity determination in pp collisions at $$\sqrt{s}$$ s = 8 TeV using the ATLAS detector at the LHC

2016 ◽  
Vol 76 (12) ◽  
Author(s):  
M. Aaboud ◽  
◽  
G. Aad ◽  
B. Abbott ◽  
J. Abdallah ◽  
...  
Keyword(s):  
Atlas Detector ◽  
Pp Collisions ◽  
8 Tev
Sign in / Sign up

Export Citation Format

Share Document