Journal Article

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

Hsu, C.-L., Althubiti, N., de Sangro, R., Di Canto, A., Hayashii, H., Lemettais, C., Mantovano, M., Chirapatpimol, K., Gaur, V., Zeng, F., Kinoshita, K., Wang, Z., Lin, J., Kawasaki, T., Hazra, S., Mancinelli, G., Chilikin, K., Praz, C., Di Capua, F., Gaudino, G., Ahmed, H., Hoppe, R., Bertholet, E., Mirra, M., Fodor, A., Itoh, R., Unno, Y., Natkaniec, Z., Yuan, C. Z., Gruberová, Z., Xu, X. P., De Pietro, G., Dhamija, R., Bozek, A., Soffer, A., Dugic, K., Fillinger, T., Marcello, S., Nakamura, I., Bianchi, F., Li, C., Mondal, S., Schwanda, C., Cui, J. X., Jang, E.-J., Kumara, K., Nazaryan, G., Ghevondyan, G., Nishida, S., Graziani, E., Moneta, S., De Nardo, G., Jacobs, W. W., Podobnik, T., Maurya, S. K., Bilka, T., Gobbo, B., Junkerkalefeld, H., Tiwary, R., Bhardwaj, V., Oxford, E. R., Destefanis, M., Ji, Q. P., Kovalenko, E., Križan, P., Asner, D. M., Massaccesi, L., Jackson, P., Lyu, C., Dingfelder, J., Park, H., Hohmann, M., Horak, P., Higuchi, T., Martinov, T., Roehrken, M., Casarosa, G., Aversano, M., Giordano, R., Kojima, K., Cecchi, C., Tamponi, U., Joo, K. K., Ueda, I., Peruzzi, I., Pakhlova, G., Senyo, K., Ripp-Baudot, I., Sobotzik, M., Dujany, G., Svid

2025

Overview

A bstract We perform the first search for CP violation in D s + → K S 0 K − 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(4 S ) 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 + → K S 0 K − π + π + decays, and better than 0.3% for D s + → K S 0 K − 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.

• Publisher: Springer Berlin Heidelberg,Springer Nature B.V
• Subject: Asymmetry / Classical and Quantum Gravitation / CP violation / Elementary Particles / Helicity / High energy physics / Physics / Physics and Astronomy / Quantum Field Theories / Quantum Field Theory / Quantum Physics / Regular Article - Experimental Physics / Relativity Theory / String Theory