Updated measurement of decay-time-dependent CP asymmetries in D-0 -> K+ K- and D-0 -> pi(+)pi(-) decays
R. Aaij,C. Abellan Beteta, B. Adeva,M. Adinolfi, C. A. Aidala, Z. Ajaltouni,S. Akar,P. Albicocco,J. Albrecht, F. Alessio, M. Alexander,A. Alfonso Albero, G. Alkhazov,P. Alvarez Cartelle,Jr. Alves A. A.,S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini, G. Andreassi, M. Andreotti,J. E. Andrews,F. Archilli, P. d'Argent,J. Arnau Romeu, A. Artamonov,M. Artuso, K. Arzymatov, E. Aslanides,M. Atzeni, B. Audurier,S. Bachmann, J. J. Back, S. Baker,V. Balagura,W. Baldini,A. Baranov,R. J. Barlow,G. C. Barrand, S. Barsuk,W. Barter,M. Bartolini,F. baryshnikov, V. Batozskaya, B. Batsukh, A. Battig, V. Battista, A. Bay, J. Beddow,F. Bedeschi, I. Bediaga, A. Beiter, L. J. Bel,S. Belin,N. Beliy, V. Bellee, N. Belloli, K. Belous, I. Belyaev, E. Ben-Haim, G. Bencivenni, S. Benson,S. Beranek,A. Berezhnoy, R. Bernet, D. Berninghoff, E. Bertholet, A. Bertolin,C. Betancourt, F. Betti,M. O. Bettler,M. van Beuzekom,Ia. Bezshyiko,S. Bhasin, J. Bhom,S. Bifani, P. Billoir, A. Birnkraut, A. Bizzeti,M. Bjorn,M. P. Blago,T. Blake,F. Blanc,S. Blusk, D. Bobulska,V. Bocci,O. Boente Garcia, T. Boettcher,A. Bondar, N. Bondar, S. Borghi,M. Borisyak,M. Borsato, F. Bossu, M. Boubdir,T. J. V. Bowcock,C. Bozzi,S. Braun, M. Brodski, J. Brodzicka,A. Brossa Gonzalo,D. Brundu, E. Buchanan, A. Buonaura,C. Burr, A. Bursche, J. Buytaert,W. Byczynski,S. Cadeddu,H. Cai,R. Calabrese, R. Calladine, M. Calvi,M. Calvo Gomez,A. Camboni,P. Campana,D. H. Campora Perez,L. Capriotti,A. Carbone, G. Carboni,R. Cardinale, A. Cardini, P. Carniti,K. Carvalho Akiba,G. Casse, L. Cassina,M. Cattaneo, G. Cavallero, R. Cenci,D. Chamont,M. G. Chapman,M. Charles,Ph. Charpentier,G. Chatzikonstantinidis, M. Chefdeville,V. Chekalina,C. Chen,S. Chen,S. -G. Chitic,V. Chobanova, M. Chrzaszcz, A. Chubykin, P. Ciambrone,X. Cid Vidal, G. Ciezarek,F. Cindolo, P. E. L. Clarke, M. Clemencic, H. V. Cliff, J. Closier,V. Coco, J. A. B. Coelho,J. Cogan, E. Cogneras,L. Cojocariu,P. Collins, T. Colombo, A. Comerma-Montells,A. Contu,G. Coombs, S. Coquereau,G. Corti, M. Corvo,C. M. Costa Sobral, B. Couturier,G. A. Cowan,D. C. Craik, A. Crocombe,M. Cruz Torres,R. Currie, C. D'Ambrosio,F. Da Cunha Marinho,C. L. Da Silva,E. Dall'Occo, J. Dalseno, A. Danilina,A. Davis,O. De Aguiar Francisco,K. De Bruyn,S. De Capua,M. De Cian,J. M. De Miranda,L. De Paula,M. De Serio,P. De Simone,C. T. Dean, D. Decamp,L. Del Buono,B. Delaney,H. -P. Dembinski,M. Demmer, A. Dendek,D. Derkach, O. Deschamps, F. Desse,F. Dettori,B. Dey,A. Di Canto,P. Di Nezza,S. Didenko,H. Dijkstra,F. Dordei,M. Dorigo,A. Dosil Suarez, L. Douglas, A. Dovbnya,K. Dreimanis,L. Dufour, G. Dujany, P. Durante,J. M. Durham,D. Dutta, R. Dzhelyadin,M. Dziewiecki,A. Dziurda, A. Dzyuba, S. Easo,U. Egede,V. Egorychev,S. Eidelman,S. Eisenhardt, U. Eitschberger, R. Ekelhof, L. Eklund,S. Ely, A. Ene,S. Escher,S. Esen,T. Evans, A. Falabella, N. Farley, S. Farry,D. Fazzini,P. Fernandez Declara,A. Fernandez Prieto,F. Ferrari,L. Ferreira Lopes,F. Ferreira Rodrigues, M. Ferro-Luzzi,S. 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PHYSICAL REVIEW D（2020）
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摘要
A search for decay-time-dependent charge-parity (CP) asymmetry in D-0 -> K+ K- and D-0 -> pi(+)pi(-) eff decays is performed at the LHCb experiment using proton-proton collision data recorded at a center-of-mass energy of 13 TeV, and corresponding to an integrated luminosity of 5.4 fb(-1). The D-0 mesons are required to originate from semileptonic decays of b hadrons, such that the charge of the muon identifies the flavor of the neutral D meson at production. The asymmetries in the effective decay widths of D-0 and (D) over bar (0) mesons are determined to be A(Gamma)(K+ K-) = (-4.3 +/- 3.6 +/- 0.5) x 10(-4) and A(Gamma) (K+ K- ) = (2.2 +/- 7.0 +/- 0.8) x 10(-4), where the uncertainties are statistical and systematic, respectively. The results are consistent with CP symmetry and, when combined with previous LHCb results, yield A(Gamma) (K+ K-) = (-4.4 +/- 2.3 +/- 0.6) x 10(-4) and A(Gamma) (pi(+)pi(-))= (2.5 +/- 4.3 +/- 0.7) x 10(-4).
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