Measurement of the time-integrated CP asymmetry in D0 → KS0 KS0 decays using Belle and Belle II data

I Adachi; L Aggarwal; H Ahmed; H Aihara; N Akopov; A Aloisio; N Althubiti; N Anh Ky; DM Asner; H Atmacan; V Aushev; M Aversano; R Ayad; V Babu; NK Baghel; S Bahinipati; P Bambade; S Banerjee; S Bansal; M Barrett; M Bartl; J Baudot; A Beaubien; J Becker; JV Bennett; V Bertacchi; M Bertemes; E Bertholet; M Bessner; S Bettarini; B Bhuyan; D Biswas; A Bobrov; D Bodrov; A Bolz; A Boschetti; A Bozek; M Bračko; P Branchini; RA Briere; TE Browder; A Budano; S Bussino; Q Campagna; M Campajola; G Casarosa; C Cecchi; J Cerasoli; MC Chang; P Chang; R Cheaib; P Cheema; C Chen; BG Cheon; K Chilikin; K Chirapatpimol; HE Cho; K Cho; SJ Cho; SK Choi; S Choudhury; J Cochran; L Corona; JX Cui; S Das; E De La Cruz-Burelo; SA De La Motte; G De Pietro; R De Sangro; M Destefanis; A Di Canto; F Di Capua; J Dingfelder; Z DoleŽal; TV Dong; M Dorigo; D Dossett; G Dujany; P Ecker; J Eppelt; P Feichtinger; T Ferber; T Fillinger; C Finck; G Finocchiaro; A Fodor; F Forti; BG Fulsom; A Gabrielli; E Ganiev; G Gaudino; V Gaur; A Gaz; A Gellrich; G Ghevondyan; D Ghosh; H Ghumaryan; G Giakoustidis; R Giordano; A Giri

Journal article

Measurement of the time-integrated CP asymmetry in D0 → KS0 KS0 decays using Belle and Belle II data

I Adachi, L Aggarwal, H Ahmed, H Aihara, N Akopov, A Aloisio, N Althubiti, N Anh Ky, DM Asner, H Atmacan, V Aushev, M Aversano, R Ayad, V Babu, NK Baghel, S Bahinipati, P Bambade, S Banerjee, S Bansal, M Barrett Show all

Physical Review D | American Physical Society (APS) | Published : 2025

DOI: 10.1103/PhysRevD.111.012015

Abstract

We measure the time-integrated CP asymmetry in D0→KS0KS0 decays reconstructed in e+e-→cc¯ events collected by the Belle and Belle II experiments. The corresponding data samples have integrated luminosities of 980 and 428 fb-1, respectively. The D0 decays are required to originate from the D∗+→D0π+ decay, which determines the charm flavor at production time. A control sample of D0→K+K- decays is used to correct for production and detection asymmetries. The result, (-1.4±1.3(stat)±0.1(syst))%, is consistent with previous determinations and with CP symmetry.