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 date for singly-Cabibbo-suppressed D+ decays. Our results for the other asymmetries are the first such measurements performed for charm decays.

Search for CP violation in $$ {D}_{(s)}^{+}\to {K}_S^0{K}^{-}{\pi}^{+}{\pi}^{+} $$ decays using triple and quadruple products / Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., Aloisio, A., Althubiti, N., Anh Ky, N., Asner, D.M., Atmacan, H., Aushev, V., Aversano, M., Ayad, R., Babu, V., Bae, H., Baghel, N.K., Bahinipati, S., Bambade, P., Banerjee, Sw., Baudot, J., Baur, A., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2025:4(2025). [10.1007/jhep04(2025)036]

Search for CP violation in $$ {D}_{(s)}^{+}\to {K}_S^0{K}^{-}{\pi}^{+}{\pi}^{+} $$ decays using triple and quadruple products

Aloisio, A.;Campajola, M.;De Nardo, G.;Di Capua, F.;Gaudino, G.;Giordano, R.;Merola, M.;Mirra, M.;
2025

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 date for singly-Cabibbo-suppressed D+ decays. Our results for the other asymmetries are the first such measurements performed for charm decays.
2025
Search for CP violation in $$ {D}_{(s)}^{+}\to {K}_S^0{K}^{-}{\pi}^{+}{\pi}^{+} $$ decays using triple and quadruple products / Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., Aloisio, A., Althubiti, N., Anh Ky, N., Asner, D.M., Atmacan, H., Aushev, V., Aversano, M., Ayad, R., Babu, V., Bae, H., Baghel, N.K., Bahinipati, S., Bambade, P., Banerjee, Sw., Baudot, J., Baur, A., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2025:4(2025). [10.1007/jhep04(2025)036]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/1011939
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