Journal of High Energy Physics (Jun 2021)

Measurements of branching fractions and asymmetry parameters of Ξ c 0 → Λ K ¯ ∗ 0 $$ {\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0} $$ , Ξ c 0 → Σ 0 K ¯ ∗ 0 $$ {\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0} $$ , and Ξ c 0 → Σ + K ∗ − $$ {\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -} $$ decays at Belle

  • The Belle collaboration,
  • S. Jia,
  • S. S. Tang,
  • C. P. Shen,
  • I. Adachi,
  • H. Aihara,
  • S. Al Said,
  • D. M. Asner,
  • V. Aulchenko,
  • T. Aushev,
  • R. Ayad,
  • V. Babu,
  • S. Bahinipati,
  • P. Behera,
  • J. Bennett,
  • M. Bessner,
  • T. Bilka,
  • J. Biswal,
  • A. Bobrov,
  • G. Bonvicini,
  • A. Bozek,
  • M. Bračko,
  • T. E. Browder,
  • M. Campajola,
  • D. Červenkov,
  • M.-C. Chang,
  • V. Chekelian,
  • A. Chen,
  • B. G. Cheon,
  • K. Chilikin,
  • H. E. Cho,
  • K. Cho,
  • S.-J. Cho,
  • S.-K. Choi,
  • Y. Choi,
  • S. Choudhury,
  • D. Cinabro,
  • S. Cunliffe,
  • S. Das,
  • G. De Nardo,
  • R. Dhamija,
  • F. Di Capua,
  • Z. Doležal,
  • T. V. Dong,
  • S. Eidelman,
  • D. Epifanov,
  • T. Ferber,
  • K. Flood,
  • B. G. Fulsom,
  • R. Garg,
  • V. Gaur,
  • N. Gabyshev,
  • A. Garmash,
  • A. Giri,
  • P. Goldenzweig,
  • O. Hartbrich,
  • K. Hayasaka,
  • H. Hayashii,
  • W.-S. Hou,
  • C.-L. Hsu,
  • T. Iijima,
  • K. Inami,
  • A. Ishikawa,
  • R. Itoh,
  • M. Iwasaki,
  • Y. Iwasaki,
  • W. W. Jacobs,
  • Y. Jin,
  • K. K. Joo,
  • G. Karyan,
  • Y. Kato,
  • H. Kichimi,
  • C. H. Kim,
  • D. Y. Kim,
  • K.-H. Kim,
  • S. H. Kim,
  • Y.-K. Kim,
  • K. Kinoshita,
  • P. Kodyš,
  • T. Konno,
  • A. Korobov,
  • S. Korpar,
  • E. Kovalenko,
  • P. Križan,
  • R. Kroeger,
  • P. Krokovny,
  • T. Kuhr,
  • K. Kumara,
  • A. Kuzmin,
  • Y.-J. Kwon,
  • K. Lalwani,
  • J. S. Lange,
  • S. C. Lee,
  • J. Li,
  • L. K. Li,
  • Y. B. Li,
  • L. Li Gioi,
  • J. Libby,
  • K. Lieret,
  • D. Liventsev,
  • C. MacQueen,
  • M. Masuda,
  • T. Matsuda,
  • D. Matvienko,
  • J. T. McNeil,
  • M. Merola,
  • F. Metzner,
  • K. Miyabayashi,
  • H. Miyata,
  • R. Mizuk,
  • G. B. Mohanty,
  • R. Mussa,
  • M. Nakao,
  • A. Natochii,
  • L. Nayak,
  • M. Nayak,
  • M. Niiyama,
  • N. K. Nisar,
  • S. Nishida,
  • K. Nishimura,
  • K. Ogawa,
  • S. Ogawa,
  • H. Ono,
  • Y. Onuki,
  • P. Oskin,
  • P. Pakhlov,
  • G. Pakhlova,
  • S. Pardi,
  • H. Park,
  • S.-H. Park,
  • S. Patra,
  • S. Paul,
  • R. Pestotnik,
  • L. E. Piilonen,
  • T. Podobnik,
  • V. Popov,
  • E. Prencipe,
  • M. T. Prim,
  • A. Rostomyan,
  • N. Rout,
  • G. Russo,
  • D. Sahoo,
  • S. Sandilya,
  • A. Sangal,
  • V. Savinov,
  • G. Schnell,
  • C. Schwanda,
  • Y. Seino,
  • K. Senyo,
  • M. E. Sevior,
  • C. Sharma,
  • J.-G. Shiu,
  • A. Sokolov,
  • E. Solovieva,
  • M. Starič,
  • Z. S. Stottler,
  • M. Sumihama,
  • T. Sumiyoshi,
  • M. Takizawa,
  • K. Tanida,
  • F. Tenchini,
  • K. Trabelsi,
  • S. Uehara,
  • T. Uglov,
  • Y. Unno,
  • K. Uno,
  • S. Uno,
  • P. Urquijo,
  • Y. Usov,
  • R. Van Tonder,
  • G. Varner,
  • E. Waheed,
  • C. H. Wang,
  • M.-Z. Wang,
  • P. Wang,
  • M. Watanabe,
  • O. Werbycka,
  • E. Won,
  • B. D. Yabsley,
  • W. Yan,
  • S. B. Yang,
  • H. Ye,
  • J. Yelton,
  • J. H. Yin,
  • C. Z. Yuan,
  • Y. Yusa,
  • Z. P. Zhang,
  • V. Zhilich,
  • V. Zhukova

DOI
https://doi.org/10.1007/JHEP06(2021)160
Journal volume & issue
Vol. 2021, no. 6
pp. 1 – 17

Abstract

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Abstract Using a data sample of 980 fb −1 collected with the Belle detector at the KEKB asymmetric-energy e + e − collider, we study the processes of Ξ c 0 → Λ K ¯ ∗ 0 $$ {\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0} $$ , Ξ c 0 → Σ 0 K ¯ ∗ 0 $$ {\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0} $$ , and Ξ c 0 → Σ + K ∗ − $$ {\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -} $$ for the first time. The relative branching ratios to the normalization mode of Ξ c 0 → Ξ − π + $$ {\Xi}_c^0\to {\Xi}^{-}{\pi}^{+} $$ are measured to be B Ξ c 0 → Λ K ¯ ∗ 0 / B Ξ c 0 → Ξ − π + = 0.18 ± 0.02 stat . ± 0.01 syst . , B Ξ c 0 → Σ 0 K ¯ ∗ 0 / B Ξ c 0 → Ξ − π + = 0.69 ± 0.03 stat . ± 0.03 syst . , B Ξ c 0 → Σ + K ∗ − / B Ξ c 0 → Ξ − π + = 0.34 ± 0.06 stat . ± 0.02 syst . , $$ {\displaystyle \begin{array}{c}\mathcal{B}\left({\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0}\right)/\mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right)=0.18\pm 0.02\left(\mathrm{stat}.\right)\pm 0.01\left(\mathrm{syst}.\right),\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0}\right)/\mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right)=0.69\pm 0.03\left(\mathrm{stat}.\right)\pm 0.03\left(\mathrm{syst}.\right),\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -}\right)/\mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right)=0.34\pm 0.06\left(\mathrm{stat}.\right)\pm 0.02\left(\mathrm{syst}.\right),\end{array}} $$ where the uncertainties are statistical and systematic, respectively. We obtain B Ξ c 0 → Λ K ¯ ∗ 0 = 3.3 ± 0.3 stat . ± 0.2 syst . ± 1.0 ref . × 10 − 3 , B Ξ c 0 → Σ 0 K ¯ ∗ 0 = 12.4 ± 0.5 stat . ± 0.5 syst . ± 3.6 ref . × 10 − 3 , B Ξ c 0 → Σ + K ∗ 0 = 6.1 ± 1.0 stat . ± 0.4 syst . ± 1.8 ref . × 10 − 3 , $$ {\displaystyle \begin{array}{c}\mathcal{B}\left({\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0}\right)=\left(3.3\pm 0.3\left(\mathrm{stat}.\right)\pm 0.2\left(\mathrm{syst}.\right)\pm 1.0\left(\mathrm{ref}.\right)\right)\times {10}^{-3},\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0}\right)=\left(12.4\pm 0.5\left(\mathrm{stat}.\right)\pm 0.5\left(\mathrm{syst}.\right)\pm 3.6\left(\mathrm{ref}.\right)\right)\times {10}^{-3},\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast 0}\right)=\left(6.1\pm 1.0\left(\mathrm{stat}.\right)\pm 0.4\left(\mathrm{syst}.\right)\pm 1.8\left(\mathrm{ref}.\right)\right)\times {10}^{-3},\end{array}} $$ where the uncertainties are statistical, systematic, and from B Ξ c 0 → Ξ − π + $$ \mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right) $$ , respectively. The asymmetry parameters α Ξ c 0 → Λ K ¯ ∗ 0 $$ \alpha \left({\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0}\right) $$ and α Ξ c 0 → Σ + K ∗ − $$ \alpha \left({\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -}\right) $$ are 0.15 ± 0.22(stat.) ± 0.04(syst.) and −0.52 ± 0.30(stat.) ± 0.02(syst.), respectively, where the uncertainties are statistical followed by systematic.

Keywords