Measurement of CP Violation in the Decay B+ →k+π0

The LHCb Collaboration

doi:10.1103/PhysRevLett.126.091802

Measurement of CP Violation in the Decay B+ →k+π0

The LHCb Collaboration

School of Physics and Astronomy

Research output: Contribution to journal › Article › Research › peer-review

26 Citations (Scopus)

Abstract

A measurement of CP violation in the decay B+→K+π0 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 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 B0→K+π- and B+→K+π0 decays, known as the Kπ puzzle.

Original language	English
Article number	091802
Number of pages	11
Journal	Physical Review Letters
Volume	126
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevLett.126.091802
Publication status	Published - 5 Mar 2021

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10.1103/PhysRevLett.126.091802Licence: CC BY

Cite this

@article{f31f44b25dab40d6ae3a671a8ec8eb08,

title = "Measurement of CP Violation in the Decay B+ →k+π0",

abstract = "A measurement of CP violation in the decay B+→K+π0 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 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 B0→K+π- and B+→K+π0 decays, known as the Kπ puzzle.",

author = "R. Aaij and \{Abell{\'a}n Beteta\}, C. and T. Ackernley and B. Adeva and M. Adinolfi and H. Afsharnia and Aidala, \{C. A.\} and S. Aiola and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and \{Alfonso Albero\}, A. and Z. Aliouche and G. Alkhazov and \{Alvarez Cartelle\}, P. and S. Amato and Y. Amhis and L. An and L. Anderlini and A. Andreianov and M. Andreotti and Andrews, \{J. E.\} and F. Archilli and A. Artamonov and M. Artuso and K. Arzymatov and E. Aslanides and M. Atzeni and B. Audurier and S. Bachmann and M. Bachmayer and Back, \{J. J.\} and S. Baker and \{Baladron Rodriguez\}, P. and V. Balagura and W. Baldini and \{Baptista Leite\}, J. and Barlow, \{R. J.\} and S. Barsuk and W. Barter and M. Bartolini and F. Baryshnikov and Basels, \{J. M.\} and G. Bassi and B. Batsukh and A. Battig and A. Bay and M. Becker and F. Bedeschi and I. Bediaga and A. Beiter and V. Belavin and S. Belin and V. Bellee and K. Belous and I. Belov and I. Belyaev and G. Bencivenni and E. Ben-Haim and A. Berezhnoy and R. Bernet and D. Berninghoff and Bernstein, \{H. C.\} and C. Bertella and E. Bertholet and A. Bertolin and C. Betancourt and F. Betti and Ia Bezshyiko and S. Bhasin and J. Bhom and L. Bian and Bieker, \{M. S.\} and S. Bifani and P. Billoir and M. Birch and Bishop, \{F. C.R.\} and A. Bizzeti and M. Bj{\o}rn and Blago, \{M. P.\} and T. Blake and F. Blanc and S. Blusk and D. Bobulska and Boelhauve, \{J. A.\} and \{Boente Garcia\}, O. and T. Boettcher and A. Boldyrev and A. Bondar and N. Bondar and S. Borghi and M. Borisyak and M. Borsato and Borsuk, \{J. T.\} and Bouchiba, \{S. A.\} and Bowcock, \{T. J.V.\} and A. Boyer and C. Bozzi and Bradley, \{M. J.\} and S. Braun and \{Brea Rodriguez\}, A. and M. Brodski and J. Brodzicka and \{Brossa Gonzalo\}, A. and D. Brundu and A. Buonaura and C. Burr and A. Bursche and A. Butkevich and Butter, \{J. S.\} and J. Buytaert and W. Byczynski and S. Cadeddu and H. Cai and R. Calabrese and L. Calefice and \{Calero Diaz\}, L. and S. Cali and R. Calladine and M. Calvi and \{Calvo Gomez\}, M. and \{Camargo Magalhaes\}, P. and A. Camboni and P. Campana and \{Campoverde Quezada\}, \{A. F.\} and S. Capelli and L. Capriotti and A. Carbone and G. Carboni and R. Cardinale and A. Cardini and I. Carli and P. Carniti and L. Carus and \{Carvalho Akiba\}, K. and \{Casais Vidal\}, A. and G. Casse and M. Cattaneo and G. Cavallero and S. Celani and J. Cerasoli and Chadwick, \{A. J.\} and Chapman, \{M. G.\} and M. Charles and Ph Charpentier and G. Chatzikonstantinidis and \{Chavez Barajas\}, \{C. A.\} and M. Chefdeville and C. Chen and S. Chen and A. Chernov and Chitic, \{S. G.\} and V. Chobanova and S. Cholak and M. Chrzaszcz and A. Chubykin and V. Chulikov and P. Ciambrone and Cicala, \{M. F.\} and \{Cid Vidal\}, X. and G. Ciezarek and Clarke, \{P. E.L.\} and M. Clemencic and Cliff, \{H. V.\} and J. Closier and Cobbledick, \{J. L.\} and V. Coco and Coelho, \{J. A.B.\} and J. Cogan and E. Cogneras and L. Cojocariu and P. Collins and T. Colombo and L. Congedo and A. Contu and N. Cooke and G. Coombs and G. Corti and \{Costa Sobral\}, \{C. M.\} and B. Couturier and Craik, \{D. C.\} and J. Crkovsk{\'a} and \{Cruz Torres\}, M. and R. Currie and \{Da Silva\}, \{C. L.\} and E. Dall'Occo and J. Dalseno and C. D'Ambrosio and A. Danilina and P. D'Argent and A. Davis and \{De Aguiar Francisco\}, O. and \{De Bruyn\}, K. and \{De Capua\}, S. and \{De Cian\}, M. and \{De Miranda\}, \{J. M.\} and \{De Paula\}, L. and \{De Serio\}, M. and \{De Simone\}, D. and \{De Simone\}, P. and \{De Vries\}, \{J. A.\} and Dean, \{C. T.\} and W. Dean and D. Decamp and \{Del Buono\}, L. and B. Delaney and Dembinski, \{H. P.\} and A. Dendek and V. Denysenko and D. Derkach and O. Deschamps and F. Desse and F. Dettori and B. Dey and \{Di Nezza\}, P. and S. Didenko and \{Dieste Maronas\}, L. and H. Dijkstra and V. Dobishuk and Donohoe, \{A. M.\} and F. Dordei and \{Dos Reis\}, \{A. C.\} and L. Douglas and A. Dovbnya and Downes, \{A. G.\} and K. Dreimanis and Dudek, \{M. W.\} and L. Dufour and V. Duk and P. Durante and Durham, \{J. M.\} and D. Dutta and M. Dziewiecki and A. Dziurda and A. Dzyuba and S. Easo and U. Egede and V. Egorychev and S. Eidelman and S. Eisenhardt and S. Ek-In and L. Eklund and S. Ely and A. Ene and E. Epple and S. Escher and J. Eschle and T. Hadavizadeh and Williams, \{Mike P.\} and Lane, \{Jake J.\} and \{The LHCb Collaboration\}",

year = "2021",

month = mar,

day = "5",

doi = "10.1103/PhysRevLett.126.091802",

language = "English",

volume = "126",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "9",

}

TY - JOUR

T1 - Measurement of CP Violation in the Decay B+ →k+π0

AU - Aaij, R.

AU - Abellán Beteta, C.

AU - Ackernley, T.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Afsharnia, H.

AU - Aidala, C. A.

AU - Aiola, S.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Alfonso Albero, A.

AU - Aliouche, Z.

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Amato, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreianov, A.

AU - Andreotti, M.

AU - Andrews, J. E.

AU - Archilli, F.

AU - Artamonov, A.

AU - Artuso, M.

AU - Arzymatov, K.

AU - Aslanides, E.

AU - Atzeni, M.

AU - Audurier, B.

AU - Bachmann, S.

AU - Bachmayer, M.

AU - Back, J. J.

AU - Baker, S.

AU - Baladron Rodriguez, P.

AU - Balagura, V.

AU - Baldini, W.

AU - Baptista Leite, J.

AU - Barlow, R. J.

AU - Barsuk, S.

AU - Barter, W.

AU - Bartolini, M.

AU - Baryshnikov, F.

AU - Basels, J. M.

AU - Bassi, G.

AU - Batsukh, B.

AU - Battig, A.

AU - Bay, A.

AU - Becker, M.

AU - Bedeschi, F.

AU - Bediaga, I.

AU - Beiter, A.

AU - Belavin, V.

AU - Belin, S.

AU - Bellee, V.

AU - Belous, K.

AU - Belov, I.

AU - Belyaev, I.

AU - Bencivenni, G.

AU - Ben-Haim, E.

AU - Berezhnoy, A.

AU - Bernet, R.

AU - Berninghoff, D.

AU - Bernstein, H. C.

AU - Bertella, C.

AU - Bertholet, E.

AU - Bertolin, A.

AU - Betancourt, C.

AU - Betti, F.

AU - Bezshyiko, Ia

AU - Bhasin, S.

AU - Bhom, J.

AU - Bian, L.

AU - Bieker, M. S.

AU - Bifani, S.

AU - Billoir, P.

AU - Birch, M.

AU - Bishop, F. C.R.

AU - Bizzeti, A.

AU - Bjørn, M.

AU - Blago, M. P.

AU - Blake, T.

AU - Blanc, F.

AU - Blusk, S.

AU - Bobulska, D.

AU - Boelhauve, J. A.

AU - Boente Garcia, O.

AU - Boettcher, T.

AU - Boldyrev, A.

AU - Bondar, A.

AU - Bondar, N.

AU - Borghi, S.

AU - Borisyak, M.

AU - Borsato, M.

AU - Borsuk, J. T.

AU - Bouchiba, S. A.

AU - Bowcock, T. J.V.

AU - Boyer, A.

AU - Bozzi, C.

AU - Bradley, M. J.

AU - Braun, S.

AU - Brea Rodriguez, A.

AU - Brodski, M.

AU - Brodzicka, J.

AU - Brossa Gonzalo, A.

AU - Brundu, D.

AU - Buonaura, A.

AU - Burr, C.

AU - Bursche, A.

AU - Butkevich, A.

AU - Butter, J. S.

AU - Buytaert, J.

AU - Byczynski, W.

AU - Cadeddu, S.

AU - Cai, H.

AU - Calabrese, R.

AU - Calefice, L.

AU - Calero Diaz, L.

AU - Cali, S.

AU - Calladine, R.

AU - Calvi, M.

AU - Calvo Gomez, M.

AU - Camargo Magalhaes, P.

AU - Camboni, A.

AU - Campana, P.

AU - Campoverde Quezada, A. F.

AU - Capelli, S.

AU - Capriotti, L.

AU - Carbone, A.

AU - Carboni, G.

AU - Cardinale, R.

AU - Cardini, A.

AU - Carli, I.

AU - Carniti, P.

AU - Carus, L.

AU - Carvalho Akiba, K.

AU - Casais Vidal, A.

AU - Casse, G.

AU - Cattaneo, M.

AU - Cavallero, G.

AU - Celani, S.

AU - Cerasoli, J.

AU - Chadwick, A. J.

AU - Chapman, M. G.

AU - Charles, M.

AU - Charpentier, Ph

AU - Chatzikonstantinidis, G.

AU - Chavez Barajas, C. A.

AU - Chefdeville, M.

AU - Chen, C.

AU - Chen, S.

AU - Chernov, A.

AU - Chitic, S. G.

AU - Chobanova, V.

AU - Cholak, S.

AU - Chrzaszcz, M.

AU - Chubykin, A.

AU - Chulikov, V.

AU - Ciambrone, P.

AU - Cicala, M. F.

AU - Cid Vidal, X.

AU - Ciezarek, G.

AU - Clarke, P. E.L.

AU - Clemencic, M.

AU - Cliff, H. V.

AU - Closier, J.

AU - Cobbledick, J. L.

AU - Coco, V.

AU - Coelho, J. A.B.

AU - Cogan, J.

AU - Cogneras, E.

AU - Cojocariu, L.

AU - Collins, P.

AU - Colombo, T.

AU - Congedo, L.

AU - Contu, A.

AU - Cooke, N.

AU - Coombs, G.

AU - Corti, G.

AU - Costa Sobral, C. M.

AU - Couturier, B.

AU - Craik, D. C.

AU - Crkovská, J.

AU - Cruz Torres, M.

AU - Currie, R.

AU - Da Silva, C. L.

AU - Dall'Occo, E.

AU - Dalseno, J.

AU - D'Ambrosio, C.

AU - Danilina, A.

AU - D'Argent, P.

AU - Davis, A.

AU - De Aguiar Francisco, O.

AU - De Bruyn, K.

AU - De Capua, S.

AU - De Cian, M.

AU - De Miranda, J. M.

AU - De Paula, L.

AU - De Serio, M.

AU - De Simone, D.

AU - De Simone, P.

AU - De Vries, J. A.

AU - Dean, C. T.

AU - Dean, W.

AU - Decamp, D.

AU - Del Buono, L.

AU - Delaney, B.

AU - Dembinski, H. P.

AU - Dendek, A.

AU - Denysenko, V.

AU - Derkach, D.

AU - Deschamps, O.

AU - Desse, F.

AU - Dettori, F.

AU - Dey, B.

AU - Di Nezza, P.

AU - Didenko, S.

AU - Dieste Maronas, L.

AU - Dijkstra, H.

AU - Dobishuk, V.

AU - Donohoe, A. M.

AU - Dordei, F.

AU - Dos Reis, A. C.

AU - Douglas, L.

AU - Dovbnya, A.

AU - Downes, A. G.

AU - Dreimanis, K.

AU - Dudek, M. W.

AU - Dufour, L.

AU - Duk, V.

AU - Durante, P.

AU - Durham, J. M.

AU - Dutta, D.

AU - Dziewiecki, M.

AU - Dziurda, A.

AU - Dzyuba, A.

AU - Easo, S.

AU - Egede, U.

AU - Egorychev, V.

AU - Eidelman, S.

AU - Eisenhardt, S.

AU - Ek-In, S.

AU - Eklund, L.

AU - Ely, S.

AU - Ene, A.

AU - Epple, E.

AU - Escher, S.

AU - Eschle, J.

AU - Hadavizadeh, T.

AU - Williams, Mike P.

AU - Lane, Jake J.

AU - The LHCb Collaboration

PY - 2021/3/5

Y1 - 2021/3/5

N2 - A measurement of CP violation in the decay B+→K+π0 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 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 B0→K+π- and B+→K+π0 decays, known as the Kπ puzzle.

AB - A measurement of CP violation in the decay B+→K+π0 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 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 B0→K+π- and B+→K+π0 decays, known as the Kπ puzzle.

UR - https://www.scopus.com/pages/publications/85102178120

U2 - 10.1103/PhysRevLett.126.091802

DO - 10.1103/PhysRevLett.126.091802

M3 - Article

C2 - 33750182

AN - SCOPUS:85102178120

SN - 0031-9007

VL - 126

JO - Physical Review Letters

JF - Physical Review Letters

IS - 9

M1 - 091802

ER -

Measurement of CP Violation in the Decay B+ →k+π0

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