Measurement of CP asymmetry in $$ {D}^0\to {K}_{\textrm{S}}^0{K}_{\textrm{S}}^0 $$ decays with Run 3 data

A bstract A measurement of CP asymmetry in $$ {D}^0\to {K}_{\textrm{S}}^0{K}_{\textrm{S}}^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>D</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mo>→</mml:mo> <mml:msubsup> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> <mml:msubsup> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> decays is reported, based on a data sample of proton-proton collisions collected with the LHCb detector in 2024 at a centre-of-mass energy of 13.6 TeV, corresponding to an integrated luminosity of 6.2 fb − 1 . The $$ {D}^0\to {K}_{\textrm{S}}^0{\pi}^{+}{\pi}^{-} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>D</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mo>→</mml:mo> <mml:msubsup> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>−</mml:mo> </mml:msup> </mml:math> decay is used as calibration channel to cancel residual detection and production asymmetries. The time-integrated CP asymmetry for the $$ {D}^0\to {K}_{\textrm{S}}^0{K}_{\textrm{S}}^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>D</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mo>→</mml:mo> <mml:msubsup> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> <mml:msubsup> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> mode is measured to be $$ {\mathcal{A}}^{CP}\left({D}^0\to {K}_{\textrm{S}}^0{K}_{\textrm{S}}^0\right)=\left(1.86\pm 1.04\pm 0.41\right)\%, $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>A</mml:mi> <mml:mi>CP</mml:mi> </mml:msup> <mml:mfenced> <mml:mrow> <mml:msup> <mml:mi>D</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mo>→</mml:mo> <mml:msubsup> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> <mml:msubsup> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:mrow> </mml:mfenced> <mml:mo>=</mml:mo> <mml:mfenced> <mml:mrow> <mml:mn>1.86</mml:mn> <mml:mo>±</mml:mo> <mml:mn>1.04</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.41</mml:mn> </mml:mrow> </mml:mfenced> <mml:mo>%</mml:mo> <mml:mo>,</mml:mo> </mml:math> where the first uncertainty is statistical, and the second is systematic. This measurement represents the most precise single-experiment determination of this quantity to date.

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Apollo (University of Cambridge)
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2025-10-21
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Particle physics theoretical and experimental studies
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article

Measurement of CP asymmetry in $$ {D}^0\to {K}_{\textrm{S}}^0{K}_{\textrm{S}}^0 $$ decays with Run 3 data

JS Butter, TH Mcgrath, P.A. Günther, ZM Mu et al.
Apollo (University of Cambridge)
Particle physics theoretical and experimental studies
article

Measurement of CP asymmetry in $$ {D}^0\to {K}_{\textrm{S}}^0{K}_{\textrm{S}}^0 $$ decays with Run 3 data

JS Butter, TH Mcgrath, P.A. Günther, ZM Mu, Ir. Diana Barbosa, J.E. Blank, NV Biesuz, Fcr Bishop, A. C. Wren, VS Kirsebom, JT Borsuk, F. M. Meng, S. L. Zhang, J. A. Teijeiro Jimenez, R. A. Ruiz Fernandez, F. L. Souza De Almeida, J. S. Ordonez Soto, E. F. Molina Cardenas, K. M. Sowa, D. K. Klekots, A. F. Campoverde Quezada, ASW Abdelmotteleb, G. M. Ma, F. L. Liu, R. I. Rabadan Trejo, KL Fischer, C. B. Van Hulse, A. L. Gilman, L. R. Madhan Mohan, J.A. Authier, R.D. Moise, Y.S. Song, Y.J. Jiang, M.M. Duras, I.V. Gorelov, R.H. O’Neil, V.M. Placinta, W.S. Shi, P.B. Battista, M.K. Kazanecki, R.B. Bonacci, I.B. Bediaga, C.S. Bolognani, K.G. Garg, R.N. Pilato, N.A. Behling, J.P. Grabowski, N.T. McHugh, J.A. Gooding, O.D. Durmus, L.N. 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Abstract

A bstract A measurement of CP asymmetry in $$ {D}^0\to {K}_{\textrm{S}}^0{K}_{\textrm{S}}^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>D</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mo>→</mml:mo> <mml:msubsup> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> <mml:msubsup> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> decays is reported, based on a data sample of proton-proton collisions collected with the LHCb detector in 2024 at a centre-of-mass energy of 13.6 TeV, corresponding to an integrated luminosity of 6.2 fb − 1 . The $$ {D}^0\to {K}_{\textrm{S}}^0{\pi}^{+}{\pi}^{-} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>D</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mo>→</mml:mo> <mml:msubsup> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>−</mml:mo> </mml:msup> </mml:math> decay is used as calibration channel to cancel residual detection and production asymmetries. The time-integrated CP asymmetry for the $$ {D}^0\to {K}_{\textrm{S}}^0{K}_{\textrm{S}}^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>D</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mo>→</mml:mo> <mml:msubsup> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> <mml:msubsup> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> mode is measured to be $$ {\mathcal{A}}^{CP}\left({D}^0\to {K}_{\textrm{S}}^0{K}_{\textrm{S}}^0\right)=\left(1.86\pm 1.04\pm 0.41\right)\%, $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>A</mml:mi> <mml:mi>CP</mml:mi> </mml:msup> <mml:mfenced> <mml:mrow> <mml:msup> <mml:mi>D</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mo>→</mml:mo> <mml:msubsup> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> <mml:msubsup> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:mrow> </mml:mfenced> <mml:mo>=</mml:mo> <mml:mfenced> <mml:mrow> <mml:mn>1.86</mml:mn> <mml:mo>±</mml:mo> <mml:mn>1.04</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.41</mml:mn> </mml:mrow> </mml:mfenced> <mml:mo>%</mml:mo> <mml:mo>,</mml:mo> </mml:math> where the first uncertainty is statistical, and the second is systematic. This measurement represents the most precise single-experiment determination of this quantity to date.

Apollo (University of Cambridge)
National Science Foundation, U.S. Department of Energy, CERN, De La Salle University, UK Research and Innovation, Ministerul Cercetării, Inovării şi Digitalizării, Institutul National de Cercetare-Dezvoltare pentru Fizica si Inginerie Nucleara 'Horia Hulubei', Leverhulme Trust, University of Warwick, Imperial College London, European Commission, University of Glasgow, University of Bristol, University College Dublin, Deutsche Forschungsgemeinschaft, Universität Heidelberg, Agence Nationale de la Recherche, École Polytechnique Fédérale de Lausanne, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, National Natural Science Foundation of China, Vrije Universiteit Amsterdam, National Science Council, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Albert-Ludwigs-Universität Freiburg, Nederlandse Organisatie voor Wetenschappelijk Onderzoek, Generalitat Valenciana, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Max-Planck-Gesellschaft, Ministerstwo Edukacji i Nauki, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, National Academy of Sciences of Ukraine, Centre National de la Recherche Scientifique, Financiadora de Estudos e Projetos, Universitat de Barcelona, Université de Fribourg, Universität Zürich, RWTH Aachen University, Rheinische Friedrich-Wilhelms-Universität Bonn, Universitat Ramon Llull, Région Auvergne-Rhône-Alpes, Universidade de Santiago de Compostela, CAS Center for Excellence in Particle Physics, Technische Universität Dortmund, Max Planck Institute for Nuclear Physics, Sorbonne Université, Australian Research Data Commons, Science and Technology Facilities Council, Deutsches Elektronen-Synchrotron, Agencia Estatal de Investigación, Institute of High Energy Physics, Fundamental Research Funds for the Central Universities, Institut National de Physique Nucléaire et de Physique des Particules, Institut de Ciències del Cosmos, Nuclear Physics, H2020 Marie Skłodowska-Curie Actions
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Particle physics theoretical and experimental studies
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