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Measurement of the CP Violation Parameter A_{Γ} in D^{0}→K^{+}K^{-} and D^{0}→π^{+}π^{-} Decays.
- Author(s): Aaij, R;
- Adeva, B;
- Adinolfi, M;
- Ajaltouni, Z;
- Akar, S;
- Albrecht, J;
- Alessio, F;
- Alexander, M;
- Ali, S;
- Alkhazov, G;
- Alvarez Cartelle, P;
- Alves, AA;
- Amato, S;
- Amerio, S;
- Amhis, Y;
- An, L;
- Anderlini, L;
- Andreassi, G;
- Andreotti, M;
- Andrews, JE;
- Appleby, RB;
- Archilli, F;
- d'Argent, P;
- Arnau Romeu, J;
- Artamonov, A;
- Artuso, M;
- Aslanides, E;
- Auriemma, G;
- Baalouch, M;
- Babuschkin, I;
- Bachmann, S;
- Back, JJ;
- Badalov, A;
- Baesso, C;
- Baker, S;
- Balagura, V;
- Baldini, W;
- Barlow, RJ;
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- Barsuk, S;
- Barter, W;
- Baryshnikov, F;
- Baszczyk, M;
- Batozskaya, V;
- Batsukh, B;
- Battista, V;
- Bay, A;
- Beaucourt, L;
- Beddow, J;
- Bedeschi, F;
- Bediaga, I;
- Beiter, A;
- Bel, LJ;
- Bellee, V;
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- Bettler, M-O;
- van Beuzekom, M;
- Bezshyiko, Ia;
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- Billoir, P;
- Bird, T;
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- LHCb Collaboration
- et al.
Published Web Location
http://doi.org/10.1103/PhysRevLett.118.261803No data is associated with this publication.
Abstract
Asymmetries in the time-dependent rates of D^{0}→K^{+}K^{-} and D^{0}→π^{+}π^{-} decays are measured in a pp collision data sample collected with the LHCb detector during LHC Run 1, corresponding to an integrated luminosity of 3 fb^{-1}. The asymmetries in effective decay widths between D^{0} and D[over ¯]^{0} decays, sensitive to indirect CP violation, are measured to be A_{Γ}(K^{+}K^{-})=(-0.30±0.32±0.10)×10^{-3} and A_{Γ}(π^{+}π^{-})=(0.46±0.58±0.12)×10^{-3}, where the first uncertainty is statistical and the second systematic. These measurements show no evidence for CP violation and improve on the precision of the previous best measurements by nearly a factor of two.