Search for CP violation in Ds →KS0K−π π decays using triple and quadruple products

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; H Bae; NK Baghel; S Bahinipati; P Bambade; S Banerjee; J Baudot; A Baur; A Beaubien; F Becherer; J Becker; JV Bennett; FU Bernlochner; V Bertacchi; M Bertemes; E Bertholet; M Bessner; S Bettarini; V Bhardwaj; F Bianchi; T Bilka; D Biswas; A Bobrov; D Bodrov; A Boschetti; A Bozek; M Bračko; P Branchini; RA Briere; TE Browder; A Budano; S Bussino; M Campajola; L Cao; G Casarosa; C Cecchi; J Cerasoli; MC Chang; P Chang; P Cheema; BG Cheon; K Chilikin; K Chirapatpimol; HE Cho; K Cho; SJ Cho; SK Choi; S Choudhury; J Cochran; L Corona; JX Cui; E De La Cruz-Burelo; SA De La Motte; G De Nardo; G De Pietro; R de Sangro; M Destefanis; R Dhamija; A Di Canto; F Di Capua; J Dingfelder; Z Doležal; TV Dong; M Dorigo; S Dubey; K Dugic; G Dujany; P Ecker; D Epifanov; J Eppelt; P Feichtinger; T Ferber; T Fillinger; C Finck; G Finocchiaro; A Fodor; F Forti; BG Fulsom; A Gabrielli; E Ganiev; M Garcia-Hernandez; R Garg; G Gaudino; V Gaur; A Gaz; A Gellrich; G Ghevondyan; D Ghosh

Journal article

Search for CP violation in Ds →KS0K−π π decays using triple and quadruple products

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, H Bae, NK Baghel, S Bahinipati, P Bambade, S Banerjee, J Baudot, A Baur Show all

Journal of High Energy Physics | Springer Science and Business Media LLC | Published : 2025

DOI: 10.1007/JHEP04(2025)036

Abstract

We perform the first search for CP violation in Ds+→KS0K−π+π+ decays. We use a combined data set from the Belle and Belle II experiments, which study e+e− collisions at center-of-mass energies at or near the Υ(4S) resonance. We use 980 fb−1 of data from Belle and 428 fb−1 of data from Belle II. We measure six CP-violating asymmetries that are based on triple products and quadruple products of the momenta of final-state particles, and also the particles’ helicity angles. We obtain a precision at the level of 0.5% for D+→KS0K−π+π+ decays, and better than 0.3% for Ds+→KS0K−π+π+ decays. No evidence of CP violation is found. Our results for the triple-product asymmetries are the most precise to d..

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