pith. sign in

arxiv: 2606.20797 · v1 · pith:SFM7HU5Znew · submitted 2026-06-18 · ✦ hep-ex

Measurement of mixing-induced CP violation in the decay B⁰ to π⁰ π⁰

Belle II Collaboration: M. Abumusabh , I. Adachi , K. Adamczyk , A. Aggarwal , Y. Ahn , H. Aihara , M. Akdag , N. Akopov
show 431 more authors
S. Alghamdi M. Alhakami N. Althubiti K. Amos M. Angelsmark N. Anh Ky C. Antonioli K. Arai H. Atmacan T. Aushev V. Aushev R. Ayad V. Babu H. Bae N. K. Baghel S. Bahinipati P. Bambade Sw. Banerjee S. Bansal M. Barrett M. Bartl J. Baudot A. Beaubien F. Becherer J. Becker G. F. Benfratello J. V. Bennett F. U. Bernlochner V. Bertacchi M. Bertemes E. Bertholet M. Bessner S. Bettarini V. Bhardwaj B. Bhuyan F. Bianchi T. Bilka D. Biswas A. Bobrov D. Bodrov A. Bondar G. Bonvicini J. Borah A. Boschetti A. Bozek M. Bra\v{c}ko P. Branchini N. Brenny R. A. Briere T. E. Browder A. Budano S. Bussino F. Callet Q. Campagna M. Campajola L. Cao M. Carminati G. Casarosa C. Cecchi M.-C. Chang P. Cheema C. Chen L. Chen B. G. Cheon C. Cheshta H. Chetri K. Chilikin K. Chirapatpimol H.-E. Cho K. Cho S.-J. Cho S.-K. Choi S. Choudhury S. Chutia J. Cochran J. A. Colorado-Caicedo I. Consigny L. Corona H. Crotte Ledesma S. Cuccuini J. X. Cui S. Das E. De La Cruz-Burelo S. A. De La Motte G. de Marino G. De Nardo G. De Pietro R. de Sangro M. Destefanis S. Dey R. Dhayal A. Di Canto J. Dingfelder Z. Dole\v{z}al X. Dong M. Dorigo K. Dugic G. Dujany P. Ecker D. Epifanov J. Eppelt R. Farkas P. Feichtinger T. Ferber T. Fillinger C. Finck G. Finocchiaro F. Forti A. Frey B. G. Fulsom A. Gabrielli P. Gagneja E. Ganiev M. Garcia-Hernandez R. Garg G. Gaudino V. Gaur V. Gautam A. Gaz A. Gellrich G. Ghevondyan D. Ghosh H. Ghumaryan R. Giordano A. Giri P. Gironella Gironell A. Glazov B. Gobbo R. Godang O. Gogota W. Gradl E. Graziani D. Greenwald Y. Guan K. Gudkova I. Haide Y. Han K. Hara K. Hayasaka H. Hayashii S. Hazra C. Hearty M. T. Hedges A. Heidelbach G. Heine I. Heredia de la Cruz M. Hern\'andez Villanueva T. Higuchi M. Hoek M. Hohmann R. Hoppe P. Horak X. T. Hou C.-L. Hsu T. Humair T. Iijima K. Inami N. Ipsita A. Ishikawa R. Itoh M. Iwasaki P. Jackson D. Jacobi W. W. Jacobs D. E. Jaffe E.-J. Jang Q. P. Ji S. Jia Y. Jin A. Johnson K. K. Joo H. Kakuno D. Kalita K. H. Kang G. Karyan F. Keil C. Kiesling C. Kim D. Y. Kim H. Kim J.-Y. Kim K.-H. Kim H. Kindo K. Kinoshita P. Kody\v{s} T. Koga S. Kohani A. Korobov S. Korpar E. Kovalenko R. Kowalewski P. Kri\v{z}an P. Krokovny T. Kuhr Y. Kulii R. Kumar K. Kumara T. Kunigo A. Kuzmin Y.-J. Kwon S. Lacaprara T. Lam J. S. Lange T. S. Lau R. Leboucher H. Lee M. J. Lee P. Leo P. M. Lewis C. Li L. K. Li Q. M. Li S. X. Li W. Z. Li Y. Li Y. B. Li Y. P. Liao J. Libby J. Lin S. Lin Z. Liptak V. Lisovskyi C. Liu G. Liu M. H. Liu Q. Y. Liu Z. Q. Liu D. Liventsev S. Longo A. Lozar T. Lueck J. L. Ma Y. Ma M. Maggiora S. P. Maharana R. Maiti G. Mancinelli R. Manfredi E. Manoni M. Mantovano D. Marcantonio S. Marcello M. Marfoli C. Marinas C. Martellini A. Martens T. Martinov L. Massaccesi M. Masuda T. Matsuda D. Matvienko S. K. Maurya M. Maushart J. A. McKenna Z. Mediankin Gruberov\'a R. Mehta F. Meier D. Meleshko M. Merola C. Miller M. Mirra K. Miyabayashi H. Miyake R. Mizuk G. B. Mohanty S. Moneta A. L. Moreira de Carvalho H.-G. Moser N. Mudgal Th. Muller H. Murakami R. Mussa K. R. Nakamura M. Nakao H. Nakazawa Y. Nakazawa Z. Natkaniec A. Natochii M. Neu M. Niiyama S. Nishida R. Nomaru A. Novosel S. Ogawa R. Okubo H. Ono Y. Onuki G. Pakhlova S. Pardi J. Park K. Park S.-H. Park A. Passeri S. Patra T. K. Pedlar R. Pestotnik M. Piccolo L. E. Piilonen P. L. M. Podesta-Lerma T. Podobnik L. Polat A. Prakash V. Prasad C. Praz S. Prell E. Prencipe M. T. Prim S. Privalov I. Prudiiev H. Purwar P. Rados S. Raiz K. Ravindran J. U. Rehman M. Reif S. Reiter M. Remnev L. Reuter D. Ricalde Herrmann I. Ripp-Baudot G. Rizzo S. H. Robertson J. M. Roney A. Rostomyan N. Rout G. Russo S. Saha Y. Sakai L. Salutari D. A. Sanders S. Sandilya L. Santelj V. Savinov B. Scavino C. Schmitt J. Schmitz S. Schneider K. Schoenning C. Schwanda Y. Seino K. Senyo J. Serrano M. E. Sevior C. Sfienti W. Shan X. D. Shi T. Shillington T. Shimasaki J.-G. Shiu D. Shtol B. Shwartz A. Sibidanov F. Simon J. B. Singh J. Skorupa A. Soffer A. Sokolov E. Solovieva S. Spataro K. \v{S}penko B. Spruck M. Stari\v{c} P. Stavroulakis S. Stefkova R. Stroili M. Sumihama K. Sumisawa M. Takahashi M. Takizawa U. Tamponi K. Tanida F. Testa A. Thaller D. V. Thanh T. Tien Manh O. Tittel R. Tiwary D. Tonelli E. Torassa K. Trabelsi F. F. Trantou I. Tsaklidis M. Uchida I. Ueda T. Uglov K. Unger Y. Unno K. Uno S. Uno P. Urquijo Y. Ushiroda S. E. Vahsen R. van Tonder K. E. Varvell M. Veronesi A. Vinokurova V. S. Vismaya L. Vitale V. Vobbilisetti R. Volpe M. Wakai S. Wallner M.-Z. Wang A. Warburton M. Watanabe S. Watanuki C. Wessel X. P. Xu B. D. Yabsley S. Yamada W. Yan W. P. Yan J. Yelton K. Yi J. H. Yin K. Yoshihara C. Z. Yuan J. Yuan L. Yuan Y. Yusa L. Zani F. Zeng M. Zeyrek B. Zhang X. Zhao V. Zhilich J. S. Zhou Q. D. Zhou X. Y. Zhou L. Zhu R. \v{Z}leb\v{c}\'ik
This is my paper

Pith reviewed 2026-06-26 14:49 UTC · model grok-4.3

classification ✦ hep-ex
keywords CP violationB0 to pi0 pi0mixing-induced CPquantum entanglementphi2CKM matrixBelle IItime-dependent analysis
0
0 comments X

The pith

Quantum entanglement of B0 Bbar0 pairs enables the first measurement of mixing-induced CP violation in B0 to pi0 pi0 decays

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper reports the first extraction of the mixing-induced CP-violating coefficient S in B0 decays to two neutral pions. A new technique uses the quantum entanglement of the B0 Bbar0 pair created at the Upsilon(4S) to perform a time-dependent analysis even though the signal decay position cannot be reconstructed. With 190 million events the measurement reaches S = 0.61 with statistical errors +0.75 and -0.79 plus 0.11 systematic, a precision that conventional vertex reconstruction would require twenty times more data to match. The same data also give the direct CP coefficient C = 0.05 with statistical error 0.28 and systematic 0.07. These numbers tighten the constraints that B to pi pi decays place on the CKM angle phi2.

Core claim

We report the first measurement of mixing-induced CP violation in B0 to pi0 pi0 decays. The measurement uses 190 million Upsilon(4S) to B0 Bbar0 events collected with Belle II. A new approach that exploits the quantum entanglement of the B0 Bbar0 pair enables a decay-time-dependent analysis without reconstructing the B0 to pi0 pi0 decay position. We measure the mixing-induced CP-violating coefficient to be S_pi0 pi0 = 0.61 +0.75 -0.79 (stat) plus or minus 0.11 (syst). We also measure the direct CP-violating coefficient to be C_pi0 pi0 = 0.05 plus or minus 0.28 (stat) plus or minus 0.07 (syst). These results substantially improve the constraints from B to pi pi decays on the CP-violating phas

What carries the argument

Quantum entanglement of the B0 Bbar0 pair produced at the Upsilon(4S), which supplies the decay-time information needed for a time-dependent CP analysis without reconstructing the signal decay vertex

If this is right

  • The measured values of S and C tighten the constraints that B to pi pi decays place on the CKM angle phi2.
  • The reported precision on S equals what a standard vertex-reconstruction analysis would achieve only with twenty times more integrated luminosity.
  • This constitutes the first experimental determination of mixing-induced CP violation in the B0 to pi0 pi0 channel.
  • Both the direct CP coefficient C and the mixing-induced coefficient S are extracted simultaneously from the same data set.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The entanglement technique could be adapted to other neutral B decay modes that produce only neutral particles and are therefore hard to vertex.
  • Accumulating more data at SuperKEKB with the same method would reduce the uncertainty on phi2 without requiring proportionally larger data sets.
  • If the method scales cleanly, it lowers the luminosity threshold needed for competitive CP-violation measurements in modes with low reconstruction efficiency.

Load-bearing premise

The quantum entanglement between the two B mesons allows the decay time of the signal B to be inferred accurately even when its decay position is not reconstructed.

What would settle it

A conventional vertex-reconstructed analysis performed on a data set twenty times larger that returns a value of S outside the reported statistical and systematic uncertainties would show the entanglement method does not deliver the claimed precision.

read the original abstract

Measurements of charge-parity (CP) violation in quark transitions provide stringent tests of the current theory and sensitive probes of particles or interactions beyond it. We report the first measurement of mixing-induced CP violation in $B^0\to\pi^0\pi^0$ decays. The measurement uses 190 million $\Upsilon(4S)\to B^{0}\overline{B}{}^0$ events collected with the Belle II experiment at the SuperKEKB asymmetric-energy electron-positron collider. A new approach that exploits the quantum entanglement of the $B^{0}\overline{B}{}^0$ pair enables a decay-time-dependent analysis without reconstructing the $B^0 \to \pi^0\pi^0$ decay position. We measure the mixing-induced CP-violating coefficient to be $S_{\pi^{0}\pi^{0}} = 0.61^{+0.75}_{-0.79}\,(\mathrm{stat}) \pm 0.11\,(\mathrm{syst})$, attaining a precision that would require a data set twenty times as large with a conventional analysis. We also measure the direct CP-violating coefficient to be $C_{\pi^{0}\pi^{0}} = 0.05 \pm 0.28\,(\mathrm{stat}) \pm 0.07\,(\mathrm{syst})$. These results substantially improve the constraints from $B \to \pi\pi$ decays on the CP-violating phase $\phi_2$ of the quark-mixing matrix using far less data than had previously been assumed necessary.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

0 major / 2 minor

Summary. The manuscript reports the first measurement of mixing-induced CP violation in B^0 → π^0 π^0 decays, using 190 million Υ(4S) → B^0 B̄^0 events collected by Belle II. A novel method exploiting quantum entanglement of the B^0 B̄^0 pair enables a time-dependent analysis without reconstructing the signal decay vertex, inferring Δt from tag-side vertex and beam-spot information. The measured values are S_π⁰π⁰ = 0.61^{+0.75}_{-0.79} (stat) ± 0.11 (syst) and C_π⁰π⁰ = 0.05 ± 0.28 (stat) ± 0.07 (syst), with the claim that this precision would require a data set twenty times larger using conventional methods, thereby improving constraints on the CKM angle φ₂.

Significance. If the result holds, the measurement is significant as the first determination of the mixing-induced CP parameter S in this mode, providing new input to φ₂ constraints from B → ππ decays. The entanglement-based technique is a methodological advance that circumvents vertex reconstruction challenges and yields an effective 20× luminosity gain, as supported by the paper's likelihood construction, resolution modeling, and MC validation. Systematic uncertainties are evaluated via standard control samples and remain sub-dominant, strengthening the extraction of S and C.

minor comments (2)
  1. Abstract: the statement that the result 'substantially improve[s] the constraints ... using far less data than had previously been assumed necessary' would benefit from a quantitative comparison to prior limits on S_π⁰π⁰ or to the expected precision from other B → ππ modes.
  2. The manuscript should include an explicit statement in the results section on how the 20× effective luminosity gain is propagated from the resolution model and efficiency, even if the central extraction remains unchanged.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive assessment of our manuscript, which accurately summarizes the first measurement of the mixing-induced CP violation parameter S in B^0 → π^0 π^0 decays and recognizes the significance of the quantum-entanglement method. The report correctly notes the achieved precision and its implications for φ2 constraints. No major comments were raised in the report.

Circularity Check

0 steps flagged

No significant circularity; direct experimental measurement

full rationale

This is an experimental measurement paper reporting S_π⁰π⁰ and C_π⁰π⁰ extracted from 190 million Υ(4S) events via a time-dependent fit that infers Δt from tag-side information. The likelihood construction, resolution modeling, and MC validation are described in the full text without any reduction of the extracted parameters to fitted inputs by construction, self-citation chains, or ansatz smuggling. The entanglement-based method is presented as a technical innovation with explicit validation against conventional approaches, and systematic uncertainties are evaluated externally via control samples. No load-bearing step equates the reported result to its own inputs or prior author work by definition. This is the expected outcome for a data-driven collider analysis.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The measurement rests on standard assumptions of B meson physics and the validity of the described entanglement method; no additional free parameters or invented entities are introduced beyond the reported fit results.

axioms (1)
  • domain assumption Standard assumptions of the Standard Model for B meson mixing and CP violation hold for the interpretation of the measured coefficients.
    The result is presented as a test of the CKM matrix within the existing framework.

pith-pipeline@v0.9.1-grok · 8212 in / 1360 out tokens · 29336 ms · 2026-06-26T14:49:19.584183+00:00 · methodology

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.

Reference graph

Works this paper leans on

43 extracted references · 2 canonical work pages

  1. [1]

    Kobayashi, M., Maskawa, T.:CP-Violation in the Renormalizable Theory of Weak Inter- action. Progr. Theor. Phys.49, 652 (1973)

    1973

  2. [2]

    Gronau, M., London, D.: Isospin analysis of CPasymmetries inBdecays. Phys. Rev. Lett. 65, 3381 (1990)

    1990

  3. [3]

    Charles, J., Deschamps, O., Descotes-Genon, S., Niess, V.: Isospin analysis of charmlessB- meson decays. Eur. Phys. J. C77, 574 (2017)

    2017

  4. [4]

    Akai, K., Furukawa, K., Koiso, H.: SuperKEKB collider. Nucl. Instrum. Methods Phys. Res. A907, 188 (2018)

    2018

  5. [5]

    Preprint at https://arxiv.org/abs/ 1011.0352 (2010)

    Abe, T., et al.: Belle II Technical Design Report. Preprint at https://arxiv.org/abs/ 1011.0352 (2010)

    Pith/arXiv arXiv 2010

  6. [6]

    Miyabayashi, K.: Belle II electromagnetic calorimeter and its performance during early SuperKEKB operation. J. Instrum.15, 10016 (2020)

    2020

  7. [7]

    PTEP2019, 123–01 (2019)

    Altmannshofer, W.,et al.: The Belle II Physics Book. PTEP2019, 123–01 (2019). [Erratum: PTEP 2020, 029201 (2020)]

    2019

  8. [8]

    Foland, A.D.: Measurement ofCPviolation at the Υ(4S) without time ordering or ∆t. Phys. Rev. D60, 111301 (1999)

    1999

  9. [9]

    Dorigo, M., Raiz, S., Tonelli, D., ˇZlebˇ c´ ık, R.: Unlocking time-dependentCPviolation without signal vertexing atBfactories. Phys. Rev. D112, 032011 (2025)

    2025

  10. [10]

    Ye, H.,et al.: Commissioning and perfor- mance of the Belle II pixel detector. Nucl. Instrum. Meth. A987, 164875 (2021)

    2021

  11. [11]

    Adachi, I.,et al.: Measurement of the branch- ing fraction andCP-violating asymmetry of the decayB 0 →π 0π0 using 387 million Υ(4S) decays in Belle II data. Phys. Rev. D 111, 071102 (2025)

    2025

  12. [12]

    Efron, B.: Bootstrap methods: Another look at the jackknife. Ann. Statist.7, 1 (1979)

    1979

  13. [13]

    Adachi, I.,et al.: New graph-neural-network flavor tagger for Belle II and measurement of sin 2ϕ1 inB 0 →J/ψK 0 S decays. Phys. Rev. D110, 012001 (2024)

    2024

  14. [14]

    Oliver and Boyd, Edinburgh (1959)

    Fisher, R.A.: Statistical Methods and Scien- tific Inference. Oliver and Boyd, Edinburgh (1959)

    1959

  15. [15]

    Pivk, M., Le Diberder, F.R.:sPlot: a statis- tical tool to unfold data distributions. Nucl. Instrum. Methods Phys. Res. A555, 356 (2005)

    2005

  16. [16]

    Navas, S.,et al.: Review of particle physics. Phys. Rev. D110, 030001 (2024)

    2024

  17. [17]

    Charles, J., Hocker, A., Lacker, H., Laplace, S., Le Diberder, F.R., Malcles, J., Ocariz, J., Pivk, M., Roos, L.: CP violation and the CKM matrix: Assessing the impact of the asymmetricBfactories. Eur. Phys. J. C41, 1 (2005). Updated results and plots available at:http://ckmfitter.in2p3.fr

    2005

  18. [18]

    Adachi, I.,et al.: Measurement of the branching fraction, polarization, and time- dependent CP asymmetry inB 0 →ρ +ρ− decays and constraint on the CKM angleϕ 2. Phys. Rev. D111, 092001 (2025)

    2025

  19. [19]

    Keck, T.: FastBDT: A Speed-Optimized Mul- tivariate Classification Algorithm for the Belle II Experiment. Comput. Softw. Big Sci. 1, 2 (2017)

    2017

  20. [20]

    Fox, G.C., Wolfram, S.: Observables for the Analysis of Event Shapes ine +e− Annihila- tion and Other Processes. Phys. Rev. Lett. 41, 1581 (1978)

    1978

  21. [21]

    Abe, K.,et al.: A measurement of the branch- ing fraction for the inclusiveB→X sγdecays with the Belle detector. Phys. Lett. B511, 151 (2001)

    2001

  22. [22]

    Abe, K.,et al.: Measurement of Branching Fractions forB→ππ, KπandKKDecays. Phys. Rev. Lett.87, 101801 (2001)

    2001

  23. [23]

    Bjorken, J.D., Brodsky, S.J.: Statistical model for electron-positron annihilation into 19 hadrons. Phys. Rev. D1, 1416 (1970)

    1970

  24. [24]

    Farhi, E.: A QCD Test for Jets. Phys. Rev. Lett.39, 1587 (1977)

    1977

  25. [25]

    An Attempt to analyze high-energy collisions as two-body processes

    Brandt, S., Peyrou, C., Sosnowski, R., Wrob- lewski, A.: The Principal axis of jets. An Attempt to analyze high-energy collisions as two-body processes. Phys. Lett.12, 57 (1964)

    1964

  26. [26]

    Das, A.,et al.: Measurements of Branch- ing Fractions forB 0 →D + s π− and ¯B0 → D+ s K −. Phys. Rev. D82, 051103 (2010)

    2010

  27. [27]

    Aubert, B.,et al.: Measurement of the Branching Fractions of the Rare Decays B0 →D (∗) s π−,B 0 →D (∗) s ρ−, andB 0 → D(∗) s K(∗)+. Phys. Rev. D78, 032005 (2008)

    2008

  28. [28]

    Aaij, R.,et al.: Measurement of the branching fraction of theB 0→D+ s π− decay. Eur. Phys. J. C81, 314 (2021)

    2021

  29. [29]

    Amhis, Y.S.,et al.: Averages of b- hadron, c-hadron, andτ-lepton properties as of 2021. Phys. Rev.D107, 052008 (2023). With specific results from doi:10.5281/zenodo.19371140

    work page doi:10.5281/zenodo.19371140 2021

  30. [30]

    Long, O., Baak, M., Cahn, R.N., Kirkby, D.P.: Impact of tag side interference on time dependentC Pasymmetry measure- ments using coherentB 0B0 pairs. Phys. Rev. D68, 034010 (2003)

    2003

  31. [31]

    Banerjee, S.,et al.: Averages ofb-hadron,c- hadron, andτ-lepton properties as of 2023. Phys. Rev.D113, 012008 (2026)

    2023

  32. [32]

    Banerjee, S.,et al.: Averages ofb- hadron,c-hadron, andτ-lepton properties as of 2023. Phys. Rev.D113, 012008 (2026). With specific results from doi:10.5281/zenodo.19210609

    work page doi:10.5281/zenodo.19210609 2023

  33. [33]

    Duh, Y.-T.,et al.: Measurements of branch- ing fractions and direct CP asymmetries for B→Kπ,B→ππandB→KKdecays. Phys. Rev. D87, 031103 (2013)

    2013

  34. [34]

    Adachi, I.,et al.: Measurement of branching fractions and direct CP asymmetries forB→ KπandB→ππdecays at Belle II. Phys. Rev. D109, 012001 (2024)

    2024

  35. [35]

    Aubert, B.,et al.: Observation ofB + → ¯K0K+ andB 0 →K 0 ¯K0. Phys. Rev. Lett. 97, 171805 (2006)

    2006

  36. [36]

    Bornheim, A.,et al.: Measurements of charm- less hadronic two bodyBmeson decays and the ratioB(B→DK)/B(B→Dπ). Phys. Rev. D68, 052002 (2003). [Erratum: Phys.Rev.D 75, 119907 (2007)]

    2003

  37. [37]

    JHEP10, 037 (2012)

    Aaij, R.,et al.: Measurement ofb-hadron branching fractions for two-body decays into charmless charged hadrons. JHEP10, 037 (2012)

    2012

  38. [38]

    Aaltonen, T.,et al.: Measurements of Direct CPViolating Asymmetries in Charmless Decays of Strange Bottom Mesons and Bot- tom Baryons. Phys. Rev. Lett.106, 181802 (2011)

    2011

  39. [39]

    Aubert, B.,et al.: Improved Measurements of the Branching Fractions forB 0 →π +π− and B0 →K +π−, and a Search forB0 →K +K −. Phys. Rev. D75, 012008 (2007)

    2007

  40. [40]

    Julius, T.,et al.: Measurement of the branch- ing fraction andCPasymmetry inB 0 → π0π0 decays, and an improved constraint on ϕ2. Phys. Rev. D96, 032007 (2017)

    2017

  41. [41]

    Lees, J.P.,et al.: Measurement ofCPAsym- metries and Branching Fractions in Charm- less Two-BodyB-Meson Decays to Pions and Kaons. Phys. Rev. D87, 052009 (2013)

    2013

  42. [42]

    Adachi, I.,et al.: Measurement of theCP violation parameters inB 0 →π +π− decays. Phys. Rev. D88, 092003 (2013)

    2013

  43. [43]

    JHEP03, 075 (2021) 20

    Aaij, R.,et al.: Observation ofCPviolation in two-bodyB 0 (s)-meson decays to charged pions and kaons. JHEP03, 075 (2021) 20

    2021