학술논문
Search for $C\!P$ violation using $T$-odd correlations in $D_{(s)}^{+}\to K^{+} K^{-}\pi^{+}\pi^{0}$, $D_{(s)}^{+}\to K^{+} \pi^{-}\pi^{+}\pi^{0}$, and $D^{+}\to K^{-}\pi^{+}\pi^{+}\pi^{0}$ decays
Document Type
Working Paper
Author
Belle Collaboration; Li, L. K.; Schwartz, A. J.; Won, E.; Kinoshita, K.; Adachi, I.; Aihara, H.; Said, S. Al; Asner, D. M.; Aulchenko, V.; Aushev, T.; Babu, V.; Banerjee, Sw.; Behera, P.; Belous, K.; Bennett, J.; Bessner, M.; Bilka, T.; Biswas, D.; Bobrov, A.; Bodrov, D.; Bonvicini, G.; Borah, J.; Bračko, M.; Branchini, P.; Budano, A.; Červenkov, D.; Chang, M. -C.; Cheon, B. G.; Cho, H. E.; Cho, K.; Choi, S. -K.; Choi, Y.; Choudhury, S.; Cinabro, D.; Cochran, J.; Das, S.; De Nardo, G.; De Pietro, G.; Dhamija, R.; Di Capua, F.; Dingfelder, J.; Doležal, Z.; Dong, T. V.; Dubey, S.; Epifanov, D.; Frey, A.; Fulsom, B. G.; Gaur, V.; Giri, A.; Goldenzweig, P.; Gong, G.; Graziani, E.; Greenwald, D.; Gu, T.; Guan, Y.; Gudkova, K.; Hadjivasiliou, C.; Hara, T.; Hayasaka, K.; Hayashii, H.; Herrmann, D.; Hou, W. -S.; Hsu, C. -L.; Ipsita, N.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Jacobs, W. W.; Jang, E. -J.; Ji, Q. P.; Jia, S.; Jin, Y.; Joo, K. K.; Kahn, J.; Kaliyar, A. B.; Kiesling, C.; Kim, C. H.; Kim, D. Y.; Kim, K. -H.; Kim, Y. J.; Kim, Y. -K.; Kindo, H.; Kodyš, P.; Korobov, A.; Korpar, S.; Kovalenko, E.; Križan, P.; Krokovny, P.; Kumar, M.; Kumar, R.; Kumara, K.; Kwon, Y. -J.; Lai, Y. T.; Lam, T.; Lee, S. C.; Li, Y.; Libby, J.; Lieret, K.; Lin, Y. -R.; Liventsev, D.; Ma, Y.; Masuda, M.; Matsuda, T.; Matvienko, D.; Maurya, S. K.; Meier, F.; Merola, M.; Metzner, F.; Mizuk, R.; Mohanty, G. B.; Nakao, M.; Narwal, D.; Natkaniec, Z.; Natochii, A.; Nayak, L.; Nisar, N. K.; Nishida, S.; Ogawa, S.; Ono, H.; Oskin, P.; Pakhlova, G.; Pardi, S.; Park, H.; Park, J.; Park, S. -H.; Passeri, A.; Patra, S.; Paul, S.; Pestotnik, R.; Piilonen, L. E.; Podobnik, T.; Prencipe, E.; Prim, M. T.; Russo, G.; Sandilya, S.; Sangal, A.; Santelj, L.; Savinov, V.; Schnell, G.; Schwanda, C.; Seino, Y.; Sevior, M. E.; Shan, W.; Shapkin, M.; Sharma, C.; Shiu, J. -G.; Shwartz, B.; Solovieva, E.; Starič, M.; Stottler, Z. S.; Sumihama, M.; Takizawa, M.; Tanida, K.; Tenchini, F.; Uchida, M.; Uglov, T.; Unno, Y.; Uno, K.; Uno, S.; Varner, G.; Varvell, K. E.; Vinokurova, A.; Wang, D.; Wang, E.; Wang, X. L.; Watanuki, S.; Werbycka, O.; Xu, X.; Yabsley, B. D.; Yan, W.; Yang, S. B.; Yin, J. H.; Yook, Y.; Zhang, Z. P.; Zhilich, V.; Zhukova, V.
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Abstract
We search for $C\!P$ violation using $T$-odd correlations in five $D_{(s)}^{+}$ and $D_{(s)}^{-}$ four-body decays. Our analysis is based on 980 $\rm fb^{-1}$ of data collected by the Belle detector at the KEKB energy-asymmetric $e^+e^-$ collider. Our results for the $T$-odd $C\!P$-violating parameter $a^{T\text{-odd}}_{C\!P}$ are: $a^{T\text{-odd}}_{C\!P}({D^{+}\to K^{-}K^{+}\pi^{+}\pi^{0}}) = (+2.6\pm 6.6\pm 1.3 )\times10^{-3}$, $a^{T\text{-odd}}_{C\!P}({D^{+}\to K^{+}\pi^{-}\pi^{+}\pi^{0}}) = (-1.3\pm 4.2\pm 0.1 )\times10^{-2}$, $a^{T\text{-odd}}_{C\!P}({D^{+}\to K^{-}\pi^{+}\pi^{+}\pi^{0}}) = (+0.2\pm 1.5\pm 0.8 )\times10^{-3}$, $a^{T\text{-odd}}_{C\!P}({D_s^{+}\to K^{+}\pi^{-}\pi^{+}\pi^{0}}) = (-1.1\pm 2.2\pm 0.1 )\times10^{-2}$, and $a^{T\text{-odd}}_{C\!P}({D_s^{+}\to K^{-}K^{+}\pi^{+}\pi^{0}}) = (+2.2\pm 3.3\pm 4.3 )\times10^{-3}$, where the uncertainties are statistical and systematic, respectively. These results are the first such measurements and are all consistent with zero. They include the first measurement for a $D^+_s$ singly Cabibbo-suppressed decay, and the first measurement for a $D$ meson doubly Cabibbo-suppressed decay. We also measure $a^{T\text{-odd}}_{C\!P}$ in different subregions of phase space, where the decays are dominated by different intermediate resonance states such as $D^+\to\phi\rho^+$, $\bar{K}^{*0}K^{*+}$, and $\bar{K}^{*0}\rho^+$; and $D_s^+\to K^{*+}\rho^{0}$, $K^{*0}\rho^{+}$, $\phi\rho^+$, and $\bar{K}^{*0}K^{*+}$. No evidence for $C\!P$ violation is found.
Comment: 10 pages, 5 figures
Comment: 10 pages, 5 figures