First Measurements of Absolute Branching Fractions of the $\Xi_c^0$ Baryon at Belle

Y.B. Li C.P. Shen C.Z. Yuan I. Adachi H. Aihara S. Al Said D.M. Asner T. Aushev R. Ayad I. Badhrees Y. Ban V. Bansal C. Beleño M. Berger V. Bhardwaj B. Bhuyan T. Bilka J. Biswal A. Bondar A. Bozek M. Bračko L. Cao D. Červenkov A. Chen B.G. Cheon K. Chilikin K. Cho S.-K. Choi Y. Choi D. Cinabro S. Cunliffe S. Di Carlo 1 Z. Doležal T.V. Dong Z. Drásal S. Eidelman J.E. Fast B.G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig D. Greenwald B. Grube K. Hayasaka H. Hayashii C.-L. Hsu T. Iijima K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W.W. Jacobs S. Jia Y. Jin D. Joffe K.K. Joo G. Karyan T. Kawasaki H. Kichimi D.Y. Kim H.J. Kim J.B. Kim K.T. Kim S.H. Kim K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan R. Kroeger P. Krokovny T. Kumita A. Kuzmin Y.-J. Kwon J.Y. Lee S.C. Lee L.K. Li L. Li Gioi J. Libby D. Liventsev M. Lubej J. Macnaughton M. Masuda T. Matsuda M. Merola K. Miyabayashi H. Miyata R. Mizuk G.B. Mohanty R. Mussa E. Nakano M. Nakao K.J. Nath M. Nayak M. Niiyama S. Nishida H. Ono Y. Onuki P. Pakhlov G. Pakhlova B. Pal S. Pardi S.-H. Park S. Paul T.K. Pedlar R. Pestotnik L.E. Piilonen V. Popov E. Prencipe G. Russo Y. Sakai M. Salehi S. Sandilya L. Santelj T. Sanuki V. Savinov O. Schneider G. Schnell J. Schueler C. Schwanda A.J. Schwartz Y. Seino K. Senyo M.E. Sevior T.-A. Shibata J.-G. Shiu B. Shwartz E. Solovieva M. Starič M. Sumihama T. Sumiyoshi W. Sutcliffe M. Takizawa K. Tanida Y. Tao F. Tenchini K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo R. van Tonder G. Varner B. Wang C.H. Wang M.-Z. Wang P. Wang X.L. Wang E. Won S.B. Yang H. Ye J. Yelton J.H. Yin Y. Yusa Z.P. Zhang V. Zhilich V. Zhukova
Abstract : We present the first measurements of absolute branching fractions of Ξc0 decays into Ξ-π+, ΛK-π+, and pK-K-π+ final states. The measurements are made using a dataset comprising (772±11)×106 BB¯ pairs collected at the ϒ(4S) resonance with the Belle detector at the KEKB e+e- collider. We first measure the absolute branching fraction for B-→Λ¯c-Ξc0 using a missing-mass technique; the result is B(B-→Λ¯c-Ξc0)=(9.51±2.10±0.88)×10-4. We subsequently measure the product branching fractions B(B-→Λ¯c-Ξc0)B(Ξc0→Ξ-π+), B(B-→Λ¯c-Ξc0)B(Ξc0→ΛK-π+), and B(B-→Λ¯c-Ξc0)B(Ξc0→pK-K-π+) with improved precision. Dividing these product branching fractions by the result for B-→Λ¯c-Ξc0 yields the following branching fractions: B(Ξc0→Ξ-π+)=(1.80±0.50±0.14)%, B(Ξc0→ΛK-π+)=(1.17±0.37±0.09)%, and B(Ξc0→pK-K-π+)=(0.58±0.23±0.05)%. For the above branching fractions, the first uncertainties are statistical and the second are systematic. Our result for B(Ξc0→Ξ-π+) can be combined with Ξc0 branching fractions measured relative to Ξc0→Ξ-π+ to yield other absolute Ξc0 branching fractions.
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Submitted on : Wednesday, December 12, 2018 - 12:47:54 PM
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Y.B. Li, C.P. Shen, C.Z. Yuan, I. Adachi, H. Aihara, et al.. First Measurements of Absolute Branching Fractions of the $\Xi_c^0$ Baryon at Belle. Phys.Rev.Lett., 2019, 122 (8), pp.082001. ⟨10.1103/PhysRevLett.122.082001⟩. ⟨hal-01952704⟩

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