Measurement Of Cp Violation In The Decay B Plus -> K+ Pi(0)
R Aaij,C Abellán Beteta, T Ackernley,B Adeva,M Adinolfi, H Afsharnia, C A Aidala, S Aiola, Z Ajaltouni,S Akar,J Albrecht, F Alessio, M Alexander,A Alfonso Albero, Z Aliouche, G Alkhazov,P Alvarez Cartelle,S Amato, Y Amhis, L An,L Anderlini, A Andreianov, M Andreotti, J E Andrews, F Archilli,A Artamonov,M Artuso, K Arzymatov, E Aslanides,M Atzeni, B Audurier,S Bachmann, M Bachmayer, J J Back,S Baker,P Baladron Rodriguez,V Balagura,W Baldini,J Baptista Leite,R J Barlow, S Barsuk,W Barter,M Bartolini,F Baryshnikov, J M Basels, G Bassi, B Batsukh, A Battig, A Bay,M Becker, F Bedeschi, I Bediaga, A Beiter, V Belavin,S Belin, V Bellee,K Belous, I Belov, I Belyaev, G Bencivenni, E Ben-Haim,A Berezhnoy, R Bernet, D Berninghoff, H C Bernstein, C Bertella, E Bertholet,A Bertolin,C Betancourt,F Betti,Ia Bezshyiko,S Bhasin, J Bhom,L Bian, M S Bieker, S Bifani, P Billoir, M Birch, F C R Bishop,A Bizzeti,M Bjørn,M P Blago,T Blake,F Blanc,S Blusk, D Bobulska, J A Boelhauve,O Boente Garcia, T 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Ferrari,L Ferreira Lopes,F Ferreira Rodrigues,S Ferreres Sole, M Ferrillo, M Ferro-Luzzi,S Filippov, R A Fini,M Fiorini,M Firlej, K M Fischer, C Fitzpatrick,T Fiutowski,F Fleuret,M Fontana,F Fontanelli, R Forty,V Franco Lima,M Franco Sevilla,M Frank, E Franzoso, G Frau,C Frei, D A Friday,J Fu, Q Fuehring, W Funk,E Gabriel,T Gaintseva,A Gallas Torreira,D Galli,S Gambetta,Y Gan, M Gandelman, P Gandini,Y Gao,M Garau,L M Garcia Martin,P Garcia Moreno,J García Pardiñas,B Garcia Plana,F A Garcia Rosales, L Garrido,C Gaspar, R E Geertsema, D Gerick, L L Gerken,E Gersabeck,M Gersabeck, T Gershon,D Gerstel,Ph Ghez, V Gibson,M Giovannetti, A Gioventù,P Gironella Gironell, L Giubega, C Giugliano,K Gizdov, E L Gkougkousis, V V Gligorov,C Göbel, E Golobardes, D Golubkov, A Golutvin,A Gomes,S Gomez Fernandez,F Goncalves Abrantes,M Goncerz,G Gong, P Gorbounov, I V Gorelov, C Gotti,E Govorkova,J P Grabowski,R Graciani Diaz, T Grammatico,L A Granado Cardoso, E Graugés, E Graverini, G Graziani, A Grecu, 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PHYSICAL REVIEW LETTERS（2021）
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摘要
A measurement of CP violation in the decay B+ -> K+pi(0) is reported using data corresponding to an integrated luminosity of 5.4 fb- 1 collected with the LHCb experiment at a center-of-mass energy of root s = 13 TeV. The CP asymmetry is measured to be 0.025 +/- 0.015 +/- 0.006 +/- 0.003, where the uncertainties are statistical, systematic, and due to an external input. This is the most precise measurement of this quantity. It confirms and significantly enhances the observed anomalous difference between the direct CP asymmetries of the B-0 -> K+pi(-) and B+ -> K+pi 0 decays, known as the K pi puzzle.
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