Measurement of CP asymmetry in Bs0 → Ds ∓K± decays

LHCb Collaboration

doi:10.1007/JHEP03(2018)059

Measurement of CP asymmetry in B_s⁰ → D_s ^∓K^± decays

LHCb Collaboration

Research output: Contribution to journal › Article (Academic Journal)

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Abstract

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, AΔΓf¯¯¯=0.31±0.28±0.15, S_f = −0.52 ± 0.20 ± 0.07, Sf¯¯¯=−0.49±0.20±0.07, 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, −2β_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.

Original language	English
Article number	59
Number of pages	28
Journal	Journal of High Energy Physics
Volume	2018
Issue number	3
Early online date	12 Mar 2018
DOIs	https://doi.org/10.1007/JHEP03(2018)059
Publication status	Published - Mar 2018

Keywords

CKM angle gamma
CP violation
B physics
Flavor physics
Hadron-Hadron scattering (experiments)

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LHCb Collaboration (2018). Measurement of CP asymmetry in B_s⁰ → D_s ^∓K^± decays. Journal of High Energy Physics, 2018(3), [59]. https://doi.org/10.1007/JHEP03(2018)059

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title = "Measurement of CP asymmetry in Bs0 → Ds ∓K± decays",

abstract = "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, AΔΓf¯¯¯=0.31±0.28±0.15, S f = −0.52 ± 0.20 ± 0.07, Sf¯¯¯=−0.49±0.20±0.07, 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, −2β 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. ",

keywords = "CKM angle gamma, CP violation, B physics, Flavor physics, Hadron-Hadron scattering (experiments)",

author = "Marco Adinolfi and Emma Buchanan and Matthew Chapman and Jeremy Dalseno and Sam Harnew and James Kariuki and Samuel Maddrell-Mander and Paras Naik and Konstantinos Petridis and Gabriela Pomery and Eugenia Price and Claire Prouve and Jonas Rademacker and Sophie Richards and Daniel Saunders and Nicola Skidmore and Jaap Velthuis and {LHCb Collaboration}",

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AU - Adinolfi, Marco

AU - Buchanan, Emma

AU - Chapman, Matthew

AU - Dalseno, Jeremy

AU - Harnew, Sam

AU - Kariuki, James

AU - Maddrell-Mander, Samuel

AU - Naik, Paras

AU - Petridis, Konstantinos

AU - Pomery, Gabriela

AU - Price, Eugenia

AU - Prouve, Claire

AU - Rademacker, Jonas

AU - Richards, Sophie

AU - Saunders, Daniel

AU - Skidmore, Nicola

AU - Velthuis, Jaap

AU - LHCb Collaboration

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N2 - 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, AΔΓf¯¯¯=0.31±0.28±0.15, S f = −0.52 ± 0.20 ± 0.07, Sf¯¯¯=−0.49±0.20±0.07, 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, −2β 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.

AB - 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, AΔΓf¯¯¯=0.31±0.28±0.15, S f = −0.52 ± 0.20 ± 0.07, Sf¯¯¯=−0.49±0.20±0.07, 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, −2β 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.

KW - CKM angle gamma

KW - CP violation

KW - B physics

KW - Flavor physics

KW - Hadron-Hadron scattering (experiments)

U2 - 10.1007/JHEP03(2018)059

DO - 10.1007/JHEP03(2018)059

M3 - Article (Academic Journal)

VL - 2018

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1029-8479

IS - 3

M1 - 59

ER -