2017/12/31 by LHCb collaboration, R. Aaij, B. Adeva +792 · 11 citations
Physics and Astronomy · #Asymmetry #CP violation #Cabibbo–Kobayashi–Maskawa matrix #Large Hadron Collider #Luminosity #Measure (data warehouse) #Neutrino Physics Research #Particle decay #Particle physics theoretical and experimental studies #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #Standard Model (mathematical formulation) #Systematic error #hep-ex
paper · pdf · doi:10.1007/jhep03(2018)059
published in Journal of High Energy Physics 2018(3) (Springer Nature) · All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-047.html
openalex created_date 2016/06/24 · openalex publication_date 2018/03/01 · arxiv created 2018/03/20 · arxiv updated 2018/03/22 · openalex updated_date 2026/08/06
A bstract We report the measurements of the CP -violating parameters in B s 0 → D s ∓ K ± decays observed in pp collisions, using a data set corresponding to an integrated luminosity of 3.0 fb −1 recorded with the LHCb detector. We measure C f = 0 . 73 ± 0 . 14 ± 0 . 05, A f ΔΓ = 0.39 ± 0.28 ± 0.15, A_f\varDelta \varGamma =0.31± 0.28± 0.15 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mi>A</mml:mi><mml:mover><mml:mi>f</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mrow><mml:mi>Δ</mml:mi><mml:mi>Γ</mml:mi></mml:mrow></mml:msubsup><mml:mo>=</mml:mo><mml:mn>0.31</mml:mn><mml:mo>±</mml:mo><mml:mn>0.28</mml:mn><mml:mo>±</mml:mo><mml:mn>0.15</mml:mn></mml:math> , S f = −0 . 52 ± 0 . 20 ± 0 . 07, S_f=-0.49± 0.20± 0.07 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>S</mml:mi><mml:mover><mml:mi>f</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:msub><mml:mo>=</mml:mo><mml:mo>−</mml:mo><mml:mn>0.49</mml:mn><mml:mo>±</mml:mo><mml:mn>0.20</mml:mn><mml:mo>±</mml:mo><mml:mn>0.07</mml:mn></mml:math> , where the uncertainties are statistical and systematic, respectively. These parameters are used together with the world-average value of the B s 0 mixing phase, −2 β s , to obtain a measurement of the CKM angle γ from B s 0 → D s ∓ K ± decays, yielding γ = (128 − 22 + 17 ) ° modulo 180°, where the uncertainty contains both statistical and systematic contributions. This corresponds to 3 . 8 σ evidence for CP violation in the interference between decay and decay after mixing.