Observation of Cabibbo-Suppressed Two-Body Hadronic Decays and Precision Mass Measurement of the Ω_{c}^{0} Baryon

• Published in: Physical review letters Vol. 132; no. 8; p. 081802
• Main Authors: Baldini, W, Barlow, R J, Barsuk, S, Bian, L, Bieker, M S, Bocharnikov, V, Braun, S, Buonincontri, L, Calvi, M, Cambon Bouzas, J, Chen, S, Ciezarek, G, Coco, V, Davidson, A, Davies, J E, Dey, B, Diachkov, I, Dobishuk, V, Egorychev, V, Eirea Orro, C, Ellbracht, J, Faria, M, Fleuret, F, Gabriel, E, Garcia Moreno, P, Gizdov, K, Gong, G, Guarise, M, Guittiere, M, Guseinov, A-K, Haimberger, J, Henderson, R D L, Henry, L, Horswill, J, Hu, W, Hulsbergen, W, Ilin, D, Inglessi, A, Jawahery, A, Jevtic, V, Johnson, D, Kolk, L, Kopciewicz, P, Kutsenko, B K, Lane, R, Langenbruch, C, Lazzari, F, Liu, Y, Lopez Huertas, A, López Soliño, S, Lucchesi, D, Manca, G, Manzari, C A, Marchand, J F, Marin Benito, C, Marshall, P J, Martelli, G, Mathad, A, Minard, M-N, Miralles, T, Moron, J, Mulder, M, Nakada, T, Nanut, T, Novoa Fernandez, J, Okamura, S, Pappenheimer, C, Pastore, A, Pellegrino, A, Petridis, K, Pham, H, Philippov, A, Pisani, F, Polycarpo, E, Qin, N, Ricciardi, S, Ruf, T, Ryzka, J, Salomoni, M, Sarpis, M, Schindler, H, Schulte, S, Schune, M H, Shang, Y, Shields, E B, Simi, G, Skuza, R, Slater, M W, Solovyev, I, Strekalina, D, Sun, J, Sun, L, Swientek, K, T'Jampens, S, Volle, F C, Wang, N W, Westhenry, B D C, Witola, L, Xie, Y, Yang, X
• Format: Journal Article
• Language: English
• Published: United States 23.02.2024
• ISSN: 1079-7114
• DOI: 10.1103/PhysRevLett.132.081802

The first observation of the singly Cabibbo-suppressed Ω_{c}^{0}→Ω^{-}K^{+} and Ω_{c}^{0}→Ξ^{-}π^{+} decays is reported, using proton-proton collision data at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4  fb^{-1}, collected with the LHCb detector between 2016 and 2018. The branching fraction ratios are measured to be B(Ω_{c}^{0}→Ω^{-}K^{+})/B(Ω_{c}^{0}→Ω^{-}π^{+})=[6.08±0.51(stat)±0.40(syst)]%,B(Ω_{c}^{0}→Ξ^{-}π^{+})/B(Ω_{c}^{0}→Ω^{-}π^{+})=[15.81±0.87(stat)±0.44(syst)±0.16(ext)]%. In addition, using the Ω_{c}^{0}→Ω^{-}π^{+} decay channel, the Ω_{c}^{0} baryon mass is measured to be M(Ω_{c}^{0})=2695.28±0.07(stat)±0.27(syst)±0.30(ext)  MeV, improving the precision of the previous world average by a factor of 4.