Measurement of CP asymmetry in D0 → K S0 K S0 decays

Roel Aaij,C. Abellán Beteta,Thomas Ackernley, B. Adeva, M. Adinolfi,Hossein Afsharnia, C. A. Aidala,Salvatore Aiola,Ziad Ajaltouni,Simon Akar, J. Albrecht,Federico Alessio, M. Alexander,A. Alfonso Albero, Zakariya Aliouche, G. Alkhazov,P. Alvarez Cartelle,Sandra Amato,Yasmine Amhis,Liupan An,Lucio Anderlini, Aleksei Andreianov, M. Andreotti,Flavio Archilli, A. Artamonov,Marina Artuso, Kenenbek Arzymatov,Elie Aslanides,Michele Atzeni,Benjamin Audurier,Sebastian Bachmann,Marie Bachmayer,J. J. Back, S. Baker,P. Baladron Rodriguez, Balagura,W. Baldini,J. Baptista Leite,R. J. Barlow,Sergey Barsuk,William Barter,Matteo Bartolini,Fedor Baryshnikov, Jan-Marc Basels,Giovanni Bassi, Baasansuren Batsukh,Alexander Battig, A. Bay,Maurice Becker,Franco Bedeschi,Ignacio Bediaga,Andrew Beiter, Belavin,Samuel Belin, Bellee, K. Belous,Ilia Belov,Ivan Belyaev, G. Bencivenni, E. Ben-Haim,Alexander Berezhnoy,Roland Bernet,Daniel Berninghoff, Harris Conan Bernstein,Claudia Bertella,A. Bertolin,Christopher Betancourt,Federico Betti, Iaroslava Bezshyiko,Srishti Bhasin,Jihyun Bhom, L. Bian,Martin Stefan Bieker,Simone Bifani,Pierre Billoir, Matthew Birch, Fionn Caitlin Ros Bishop,A. Bitadze,Andrea Bizzeti,Mikkel Bjørn,Michele Piero Blago,Thomas Blake,F. Blanc,S. Blusk, Dana Bobulska, Julian Alexander Boelhauve,O. Boente Garcia, T. Boettcher,Alexey Boldyrev, A.E. Bondar,Nikolay Bondar, S. Borghi,Maxim Borisyak,Martino Borsato,Jozef Tomasz Borsuk, Sonia Amina Bouchiba,T. J. V. Bowcock,Alexandre Boyer, C. Bozzi,Matthew John Bradley

Physical Review D（2021）

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摘要

A measurement of the CP asymmetry in D0 → K0 SK S decays is reported, based on a data sample of proton-proton collisions collected by the LHCb experiment from 2015 to 2018, corresponding to an integrated luminosity of 6 fb−1. The flavor of the D0 candidate is determined using the charge of the D∗± meson, from which the decay is required to originate. The D0 → K+K− decay is used as a calibration channel. The time-integrated CP asymmetry for the D0 → K0 SK S mode is measured to be: A (D → K SK S) = (−3.1± 1.2± 0.4± 0.2)%, where the first uncertainty is statistical, the second is systematic, and the third is due to the uncertainty on the CP asymmetry of the calibration channel. This is the most precise determination of this quantity to date. Published as a Letter in Phys. Rev. D 104, 031102 (2021) © 2021 CERN for the benefit of the LHCb collaboration. CC BY 4.0 licence. †Authors are listed at the end of this Letter. ar X iv :2 10 5. 01 56 5v 2 [ he pex ] 1 5 Se p 20 21

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