학술논문
Observation of CP Violation in Charm Decays.
Document Type
article
Author
Aaij, R; Abellán Beteta, C; Adeva, B; Adinolfi, M; Aidala, CA; Ajaltouni, Z; Akar, S; Albicocco, P; Albrecht, J; Alessio, F; Alexander, M; Alfonso Albero, A; Alkhazov, G; Alvarez Cartelle, P; Alves, AA; Amato, S; Amhis, Y; An, L; Anderlini, L; Andreassi, G; Andreotti, M; Andrews, JE; Archilli, F; d'Argent, P; Arnau Romeu, J; Artamonov, A; Artuso, M; Arzymatov, K; Aslanides, E; Atzeni, M; Audurier, B; Bachmann, S; Back, JJ; Baker, S; Balagura, V; Baldini, W; Baranov, A; Barlow, RJ; Barsuk, S; Barter, W; Bartolini, M; Baryshnikov, F; Batozskaya, V; Batsukh, B; Battig, A; Battista, V; Bay, A; Bedeschi, F; Bediaga, I; Beiter, A; Bel, LJ; Belin, S; Beliy, N; Bellee, V; Belloli, N; Belous, K; Belyaev, I; Ben-Haim, E; Bencivenni, G; Benson, S; Beranek, S; Berezhnoy, A; Bernet, R; Berninghoff, D; Bertholet, E; Bertolin, A; Betancourt, C; Betti, F; Bettler, MO; van Beuzekom, M; Bezshyiko, Ia; Bhasin, S; Bhom, J; Bieker, MS; Bifani, S; Billoir, P; Birnkraut, A; Bizzeti, A; Bjørn, M; Blago, MP; Blake, T; Blanc, F; Blusk, S; Bobulska, D; Bocci, V; Boente Garcia, O; Boettcher, T; Bondar, A; Bondar, N; Borghi, S; Borisyak, M; Borsato, M; Boubdir, M; Bowcock, TJV; Bozzi, C; Braun, S; Brodski, M; Brodzicka, J; Brossa Gonzalo, A; Brundu, D
Source
Physical review letters. 122(21)
Subject
Language
Abstract
A search for charge-parity (CP) violation in D^{0}→K^{-}K^{+} and D^{0}→π^{-}π^{+} decays is reported, using pp collision data corresponding to an integrated luminosity of 5.9 fb^{-1} collected at a center-of-mass energy of 13 TeV with the LHCb detector. The flavor of the charm meson is inferred from the charge of the pion in D^{*}(2010)^{+}→D^{0}π^{+} decays or from the charge of the muon in B[over ¯]→D^{0}μ^{-}ν[over ¯]_{μ}X decays. The difference between the CP asymmetries in D^{0}→K^{-}K^{+} and D^{0}→π^{-}π^{+} decays is measured to be ΔA_{CP}=[-18.2±3.2(stat)±0.9(syst)]×10^{-4} for π-tagged and ΔA_{CP}=[-9±8(stat)±5(syst)]×10^{-4} for μ-tagged D^{0} mesons. Combining these with previous LHCb results leads to ΔA_{CP}=(-15.4±2.9)×10^{-4}, where the uncertainty includes both statistical and systematic contributions. The measured value differs from zero by more than 5 standard deviations. This is the first observation of CP violation in the decay of charm hadrons.