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Observation of CP Violation in Charm Decays.

  • Author(s): 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;
  • Buchanan, E;
  • Buonaura, A;
  • Burr, C;
  • Bursche, A;
  • Buytaert, J;
  • Byczynski, W;
  • Cadeddu, S;
  • Cai, H;
  • Calabrese, R;
  • Cali, S;
  • Calladine, R;
  • Calvi, M;
  • Calvo Gomez, M;
  • Camboni, A;
  • Campana, P;
  • Campora Perez, DH;
  • Capriotti, L;
  • Carbone, A;
  • Carboni, G;
  • Cardinale, R;
  • Cardini, A;
  • Carniti, P;
  • Carvalho Akiba, K;
  • Casse, G;
  • Cattaneo, M;
  • Cavallero, G;
  • Cenci, R;
  • Chapman, MG;
  • Charles, M;
  • Charpentier, Ph;
  • Chatzikonstantinidis, G;
  • Chefdeville, M;
  • Chekalina, V;
  • Chen, C;
  • Chen, S;
  • Chitic, S-G;
  • Chobanova, V;
  • Chrzaszcz, M;
  • Chubykin, A;
  • Ciambrone, P;
  • Cid Vidal, X;
  • Ciezarek, G;
  • Cindolo, F;
  • Clarke, PEL;
  • Clemencic, M;
  • Cliff, HV;
  • Closier, J;
  • Coco, V;
  • Coelho, JAB;
  • Cogan, J;
  • Cogneras, E;
  • Cojocariu, L;
  • Collins, P;
  • Colombo, T;
  • Comerma-Montells, A;
  • Contu, A;
  • Coombs, G;
  • Coquereau, S;
  • Corti, G;
  • Costa Sobral, CM;
  • Couturier, B;
  • Cowan, GA;
  • Craik, DC;
  • Crocombe, A;
  • Cruz Torres, M;
  • Currie, R;
  • D'Ambrosio, C;
  • Da Silva, CL;
  • Dall'Occo, E;
  • Dalseno, J;
  • Danilina, A;
  • Davis, A;
  • De Aguiar Francisco, O;
  • De Bruyn, K;
  • De Capua, S;
  • De Cian, M;
  • De Miranda, JM;
  • De Paula, L;
  • De Serio, M;
  • De Simone, P;
  • Dean, CT;
  • Dean, W;
  • Decamp, D;
  • Del Buono, L;
  • Delaney, B;
  • Dembinski, H-P;
  • Demmer, M;
  • Dendek, A;
  • Derkach, D;
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  • Desse, F;
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  • Dey, B;
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  • Di Nezza, P;
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  • Dordei, F;
  • Dorigo, M;
  • Dosil Suárez, A;
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  • Dovbnya, A;
  • Dreimanis, K;
  • Dufour, L;
  • Dujany, G;
  • Durante, P;
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  • Dutta, D;
  • Dzhelyadin, R;
  • Dziewiecki, M;
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  • Galli, D;
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  • Garcia Martin, LM;
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  • Gligorov, VV;
  • Golubkov, D;
  • Golutvin, A;
  • Gomes, A;
  • Gorelov, IV;
  • Gotti, C;
  • Govorkova, E;
  • Grabowski, JP;
  • Graciani Diaz, R;
  • Granado Cardoso, LA;
  • Graugés, E;
  • Graverini, E;
  • Graziani, G;
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  • Gruberg Cazon, BR;
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  • Humair, T;
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  • Yeomans, LE;
  • Yin, H;
  • Yu, J;
  • Yuan, X;
  • Yushchenko, O;
  • Zarebski, KA;
  • Zavertyaev, M;
  • Zeng, M;
  • Zhang, D;
  • Zhang, L;
  • Zhang, WC;
  • Zhang, Y;
  • Zhelezov, A;
  • Zheng, Y;
  • Zhu, X;
  • Zhukov, V;
  • Zonneveld, JB;
  • Zucchelli, S;
  • LHCb Collaboration
  • et al.
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.

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