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Adachi, I.; Aihara, H.; Atmacan, H.; Ayad, R.; Belous, K.; Bilka, T.; Bodrov, D.; Bonvicini, G.; Borah, J.; Branchini, P.; Browder, T. E.; Chang, M.-C.; Chang, P.; Chekelian, V.; Chilikin, K.; Cho, K.; Cho, S.-J.; Choi, S.-K.; Cinabro, D.; Das, S.; Dash, N.; Dhamija, R.; Doležal, Z.; Dong, T. V.; Ferlewicz, D.; Fulsom, B. G.; Garg, R.; Gaur, V.; Gabyshev, N.; Giri, A.; Goldenzweig, P.; Golob, B.; Hara, T.; Hayasaka, K.; Hou, W.-S.; Inami, K.; Iwasaki, M.; Iwasaki, Y.; Jia, S.; Kahn, J.; Kang, K. H.; Kichimi, H.; Kim, Y.-K.; Kinoshita, K.; Kodyš, P.; Konno, T.; Korobov, A.; Korpar, S.; Kovalenko, E.; Kroeger, R.; Krokovny, P.; Kumar, R.; Kwon, Y.-J.; Lee, S. C.; Li, J.; Liventsev, D.; Martini, A.; Masuda, M.; Maurya, S. K.; Merola, M.; Narwal, D.; Natochii, A.; Nayak, L.; Nisar, N. K.; Ogawa, K.; Ogawa, S.; Pakhlova, G.; Pang, T.; Patra, S.; Pestotnik, R.; Piilonen, L. E.; Podobnik, T.; Popov, V.; Prim, M. T.; Röhrken, M.; Rostomyan, A.; Rout, N.; Sangal, A.; Sanuki, T.; Schnell, G.; Schwartz, A. J.; Senyo, K.; Sevior, M. E.; Shapkin, M.; Stanič, S.; Starič, M.; Sumiyoshi, T.; Takizawa, M.; Tamponi, U.; Trabelsi, K.; Unno, Y.; Uno, K.; Urquijo, P.; Vinokurova, A.; Waheed, E.; Wang, E.; Won, E.; Yabsley, B. D.; Ye, H.; Yusa, Y.
The journal of high energy physics, 03/2022, Letnik: 2022, Številka: 3Journal Article
A bstract We present the first measurement of the branching fraction of the singly Cabibbo-suppressed (SCS) decay $$ {\Lambda}_c^{+} $$ Λ c + → pη ′ with η ′ → ηπ + π − , using a data sample corresponding to an integrated luminosity of 981 fb − 1 , collected by the Belle detector at the KEKB e + e − asymmetric-energy collider. A significant $$ {\Lambda}_c^{+} $$ Λ c + → pη ′ signal is observed for the first time with a signal significance of 5.4 σ . The relative branching fraction with respect to the normalization mode $$ {\Lambda}_c^{+} $$ Λ c + → pK − π + is measured to be $$ \frac{\mathcal{B}\left({\Lambda}_c^{+}\to p\eta^{\prime}\right)}{\mathcal{B}\left({\Lambda}_c^{+}\to {pK}^{-}{\pi}^{+}\right)}=\left(7.54\pm 1.32\pm 0.73\right)\times {10}^{-3}, $$ B Λ c + → pη ′ B Λ c + → pK − π + = 7.54 ± 1.32 ± 0.73 × 10 − 3 , where the uncertainties are statistical and systematic, respectively. Using the world-average value of $$ \mathcal{B}\left({\Lambda}_c^{+}\to {pK}^{-}{\pi}^{+}\right) $$ B Λ c + → pK − π + = (6 . 28 ± 0 . 32) × 10 − 2 , we obtain $$ \mathcal{B}\left({\Lambda}_c^{+}\to p\eta^{\prime}\right)=\left(4.73\pm 0.82\pm 0.46\pm 0.24\right)\times {10}^{-4}, $$ B Λ c + → pη ′ = 4.73 ± 0.82 ± 0.46 ± 0.24 × 10 − 4 , where the uncertainties are statistical, systematic, and from $$ \mathcal{B}\left({\Lambda}_c^{+}\to {pK}^{-}{\pi}^{+}\right) $$ B Λ c + → pK − π + , respectively.
