Measurement of D⁰-D̅⁰ Mixing and CP Violation in Two-Body D⁰ Decays

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Measurement of D⁰-D̅⁰ Mixing and CP Violation in Two-Body D⁰ Decays

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Title: Measurement of D⁰-D̅⁰ Mixing and CP Violation in Two-Body D⁰ Decays
Author(s):
Lees, J. P.;
Poireau, V.;
Tisserand, V.;
Garra Tico, J.;
Grauges, E.;
Palano, A.;
Eigen, G.;
Izen, Joseph M .;
Lou, Xinchou;
BaBar Collaboration
Date Created: 2013-01-03
Format: Text
Item Type: Article
Keywords: D⁰ decays
Mesons
CP violation (Nuclear physics)
Gigaelectronvolts (GeV)
Abstract: We present a measurement of D⁰-D̅⁰ mixing and CP violation using the ratio of lifetimes simultaneously extracted from a sample of D⁰ mesons produced through the flavor-tagged process D*⁺ → D⁰π⁺, where D⁰ decays to K^∓ π^±, K⁻ K⁺, or π⁻ π⁺, along with the untagged decays D⁰ → K^∓ π^± and D⁰ → K⁻K⁺. The lifetimes of the CP-even, Cabibbo-suppressed modes K⁻K⁺ and π⁻ π⁺ are compared to that of the CP-mixed mode K^∓ π^± in order to measure y_{CP} and ΔY. We obtain y_{CP}=[0.72 ± 0.18(stat) ± 0.12(syst)]% and ΔY=[0.09 ± 0.26(stat) ±0.06(syst)]%, where ΔY constrains possible CP violation. The y_{CP} result excludes the null mixing hypothesis at 3.3σ significance. This analysis is based on an integrated luminosity of 468  fb⁻¹ collected with the BABAR detector at the PEP-II asymmetric-energy e⁺e⁻ collider.
Publisher: American Physical Society
ISSN: 1550-7998
Source: Physical Review D
Link to Related Resource: http://dx.doi.org/10.1103/PhysRevD.87.012004
Persistent Link: http://hdl.handle.net/10735.1/3841
Bibliographic Citation: Lees, J. P., V. Poireau, V. Tisserand, J. Garra Tico, et al. 2013. "Measurement of D⁰ - D̅⁰ mixing and CP violation in two-body D⁰ decays." Physical Review D 87(1), doi:10.1103/PhysRevD.87.012004
Terms of Use: ©2013 American Physical Society

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