DOE OSTI · 2564533
Search for D 0 meson decays to π + π − e + e − and K + K − e + e − final states
Abstract
A search for D 0 meson decays to the π + π − e + e − and K + K − e + e − final states is reported using a sample of proton-proton collisions collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb − 1 . The decay D 0 → π + π − e + e − is observed for the first time when requiring that the two electrons are consistent with coming from the decay of a ϕ or ρ 0 / ω meson. The corresponding branching fractions are measured relative to the D 0 → K − π − [ e + e − ] ρ 0 / ω decay, where the two electrons are consistent with coming from the decay of a ρ 0 or ω meson. No evidence is found for the D 0 → K + K − e + e − decay and world-best limits are set on its branching fraction. The results are compared to, and found to be consistent with, the branching fractions of the D 0 → π + π − μ + μ − and D 0 → K + K − μ + μ − decays recently measured by LHCb and confirm lepton universality at the current precision. © 2025 CERN, for the LHCb Collaboration 2025 CERN
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Aaij, R. (ORCID:0000000305331952), Abdelmotteleb, A. S. W. (ORCID:0000000179050542), Abellan Beteta, C., Abudinén, F. (ORCID:0000000267373528), Ackernley, T. (ORCID:0000000259513498), Adefisoye, A. A. (ORCID:0000000324481550), Adeva, B. (ORCID:0000000197563712), Adinolfi, M. (ORCID:0000000213261264), Adlarson, P. (ORCID:0000000162803851), Agapopoulou, C. (ORCID:0000000223680147), Aidala, C. A. (ORCID:0000000195404988), Ajaltouni, Z., Akar, S. (ORCID:0000000302889694), Akiba, K. (ORCID:000000026736471X), Albicocco, P. (ORCID:0000000164301038), Albrecht, J. (ORCID:0000000186361621), Alessio, F. (ORCID:0000000153171098), Alexander, M. (ORCID:0000000281482392), Aliouche, Z. (ORCID:0000000308974160), Alvarez Cartelle, P. (ORCID:0000000316522834), Amalric, R. (ORCID:0000000345952729), Amato, S. (ORCID:0000000232770662), Amey, J. L. (ORCID:0000000225973808), Amhis, Y. (ORCID:0000000342821512), An, L. (ORCID:0000000232745627), Anderlini, L. (ORCID:0000000168082418), Andersson, M. (ORCID:0000000335949163), Andreianov, A. (ORCID:0000000262730506), Andreola, P. (ORCID:000000023923431X), Andreotti, M. (ORCID:0000000329181311), Andreou, D. (ORCID:0000000162880558), Anelli, A. (ORCID:000000026191934X), Ao, D. (ORCID:0000000316474238), Archilli, F. (ORCID:0000000217796813), Argenton, M. (ORCID:0009000631690077), Arguedas Cuendis, S. (ORCID:0000000342347005), Artamonov, A. (ORCID:0000000227852233), Artuso, M. (ORCID:0000000259917273), Aslanides, E. (ORCID:000000033286683X), Ataíde Da Silva, R. (ORCID:0009000516672666), Atzeni, M. (ORCID:0000000232083336), Audurier, B. (ORCID:0000000190904254), Bacher, D. (ORCID:000000021249367X), Bachiller Perea, I. (ORCID:0000000237214876), Bachmann, S. (ORCID:0000000211863894), Bachmayer, M. (ORCID:0000000159962747), Back, J. J. (ORCID:0000000177914490), Baladron Rodriguez, P. (ORCID:0000000342402094), Balagura, V. (ORCID:0000000216117188), Balboni, A. (ORCID:000900038872976X), Baldini, W. (ORCID:0000000176588777), Balzani, L. (ORCID:0009000652411452), Bao, H. (ORCID:000900027027021X), Baptista de Souza Leite, J. (ORCID:0000000244425372), Barbero Pretel, C. (ORCID:0009000118056219), Barbetti, M. (ORCID:0000000267046914), Barbosa, I. R. (ORCID:0000000232268672), Barlow, R. J. (ORCID:0000000282958612), Barnyakov, M. (ORCID:0009000001020482), Barsuk, S. (ORCID:0000000208986551), Barter, W. (ORCID:0000000292644799), Bartz, J. (ORCID:0000000226464124), Basels, J. M. (ORCID:0000000158608770), Bashir, S. (ORCID:0000000198618922), Bassi, G. (ORCID:0000000221453805), Batsukh, B. (ORCID:0000000310202549), Battista, P. B., Bay, A. (ORCID:0000000248629399), Beck, A. (ORCID:0000000348721213), Becker, M. (ORCID:0000000279728760), Bedeschi, F. (ORCID:0000000283152119), Bediaga, I. B. (ORCID:0000000178065283), Behling, N. A. (ORCID:0000000347507872), Belin, S. (ORCID:0000000171541304), Belous, K. (ORCID:0000000300142589), Belov, I. (ORCID:0000000316999202), Belyaev, I. (ORCID:0000000274587030), Benane, G. (ORCID:0000000281768315), Bencivenni, G. (ORCID:0000000251070610), Ben-Haim, E. (ORCID:0000000295108414), Berezhnoy, A. (ORCID:0000000244317582), Bernet, R. (ORCID:0000000248568063), Bernet Andres, S. (ORCID:0000000245157541), Bertolin, A. (ORCID:0000000313934315), Betancourt, C. (ORCID:0000000198867427), Betti, F. (ORCID:000000022395235X), Bex, J. (ORCID:0000000228568074), Bezshyiko, Ia. (ORCID:0000000243156414), Bhom, J. (ORCID:000000029709903X), Bieker, M. S. (ORCID:0000000171137862), Biesuz, N. V. (ORCID:0000000330040946), Billoir, P. (ORCID:0000000154339876), Biolchini, A. (ORCID:0000000160649993), Birch, M. (ORCID:0000000191574461), Bishop, F. C. R. (ORCID:0000000200233897), Bitadze, A. (ORCID:0000000179791092), Bizzeti, A. (ORCID:0000000157295530), Blake, T. (ORCID:0000000202595891), Blanc, F. (ORCID:0000000157753132), Blank, J. E. (ORCID:0000000265465605). 2025-05-05. Search for D 0 meson decays to π + π − e + e − and K + K − e + e − final states. https://doi.org/10.1103/physrevd.111.l091101
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