Measurement of indirect CP-violating asymmetries in D0→K+K- and D0→π+π- decays at CDF

Aaltonen, Timo Antero

doi:10.1103/PhysRevD.90.111103

Title: Measurement of indirect CP-violating asymmetries in D⁰→K⁺K^- and D⁰→π⁺π^- decays at CDF

Journal Article · Tue Dec 30 00:00:00 EST 2014 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI:https://doi.org/10.1103/PhysRevD.90.111103· OSTI ID:1226298

Aaltonen, Timo Antero ^[1]

Univ. of Helsinki (Finland). et al.

We report a measurement of the indirect CP-violating asymmetries (A_Γ) between effective lifetimes of anticharm and charm mesons reconstructed in D⁰→K⁺K^- and D⁰→π⁺π^- decays. We use the full data set of proton-antiproton collisions collected by the Collider Detector at Fermilab experiment and corresponding to 9.7 fb^-1 of integrated luminosity. The strong-interaction decay D^*+→D⁰π⁺ is used to identify the meson at production as D⁰ or D^¯0. We statistically subtract D⁰ and D^¯0 mesons originating from b-hadron decays and measure the yield asymmetry between anticharm and charm decays as a function of decay time. We measure A_Γ(K⁺K^-)=(-0.19±0.15(stat)±0.04(syst))%and A_Γ(π⁺π^-)=(-0.01±0.18(stat)±0.03(syst))%. The results are consistent with the hypothesis of CP symmetry and their combination yields A_Γ=(-0.12±0.12)%.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: CDF Collaboration

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1226298

Alternate ID(s):: OSTI ID: 1180624

Report Number(s):: FERMILAB-PUB-14-429-PPD; arXiv eprint number arXiv:1410.5435; TRN: US1600942

Journal Information:: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 90, Issue 11; ISSN 1550-7998

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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Updated measurement of decay-time-dependent $C P$ asymmetries in $D^{0} \to K^{+} K^{-}$ and $D^{0} \to π^{+} π^{-}$ decays Aaij, R.; Abellán Beteta, C.; Ackernley, T. Physical Review D, Vol. 101, Issue 1 https://doi.org/10.1103/physrevd.101.012005	journal	January 2020
Averages of b-hadron, c-hadron, and $$\tau $$ τ -lepton properties as of summer 2016 Amhis, Y.; Banerjee, Sw.; Ben-Haim, E. The European Physical Journal C, Vol. 77, Issue 12 https://doi.org/10.1140/epjc/s10052-017-5058-4	journal	December 2017
Measurement of the CP violation parameter $A_{\Gamma}$ A Γ in $D^{0} \rightarrow K^{+}K^{-}$ D 0 → K + K - and $D^{0} \rightarrow \pi^{+} \pi^{-}$ D 0 → π + π - decays Marino, Pietro The European Physical Journal Plus, Vol. 134, Issue 3 https://doi.org/10.1140/epjp/i2019-12457-9	journal	March 2019

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