Search for CP violation in D s + $$ {D}_{(s)}^{+} $$ → K − K + K + decays

• Published in: The journal of high energy physics 2023-07, Vol.2023 (7), p.1-25
• Main Authors: The LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, B. Adeva, M. Adinolfi, P. Adlarson, H. Afsharnia, C. Agapopoulou, C. A. Aidala, Z. Ajaltouni, S. Akar, K. Akiba, P. Albicocco, J. Albrecht, F. Alessio, M. Alexander, A. Alfonso Albero, Z. Aliouche, P. Alvarez Cartelle, R. Amalric, S. Amato, J. L. Amey, Y. Amhis, L. An, L. Anderlini, M. Andersson, A. Andreianov, M. Andreotti, D. Andreou, D. Ao, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, M. Atzeni, B. Audurier, I. B Bachiller Perea, S. Bachmann, M. Bachmayer, J. J. Back, A. Bailly-reyre, P. Baladron Rodriguez, V. Balagura, W. Baldini, J. Baptista de Souza Leite, M. Barbetti, R. J. Barlow, S. Barsuk, W. Barter, M. Bartolini, F. Baryshnikov, J. M. Basels, G. Bassi, B. Batsukh, A. Battig, A. Bay, A. Beck, M. Becker, F. Bedeschi, I. B. Bediaga, A. Beiter, S. Belin, V. Bellee, K. Belous, I. Belov, I. Belyaev, G. Benane, G. Bencivenni, E. Ben-Haim, A. Berezhnoy, R. Bernet, S. Bernet Andres, D. Berninghoff, H. C. Bernstein, C. Bertella, A. Bertolin, C. Betancourt, F. Betti, Ia. Bezshyiko, J. Bhom, L. Bian, M. S. Bieker, N. V. Biesuz, P. Billoir, A. Biolchini, M. Birch, F. C. R. Bishop, A. Bitadze, A. Bizzeti, M. P. Blago, T. Blake, F. Blanc, J. E. Blank, S. Blusk, D. Bobulska, J. A. Boelhauve, O. Boente Garcia
• Format: Article
• Language: English
• Subjects: Charm Physics; CP Violation; Flavour Physics; Hadron-Hadron Scattering
• ISSN: 1029-8479
• DOI: 10.1007/JHEP07(2023)067

Abstract A search for direct CP violation in the Cabibbo-suppressed decay D s + $$ {D}_s^{+} $$ → K − K + K + and in the doubly Cabibbo-suppressed decay D + → K − K + K + is reported. The analysis is performed with data collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.6 fb −1. The search is conducted by comparing the D s + $$ {D}_{(s)}^{+} $$ and D s − $$ {D}_{(s)}^{-} $$ Dalitz-plot distributions through a model-independent binned technique, based on fits to the K − K + K + invariant-mass distributions, with a total of 0.97 (1.27) million D s + $$ {D}_s^{+} $$ (D +) signal candidates. The results are given as p-values for the hypothesis of CP conservation and are found to be 13.3% for the D s + $$ {D}_s^{+} $$ → K − K + K + decay and 31.6% for the D + → K − K + K + decay. No evidence for CP violation is observed in these decays.