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Observation of Ξ c ( 2930 ) 0 and updated measurement of B - → K - Λ c + Λ ¯ c - at Belle

by Kulasiri, R , Karyan, G , Li, L K , Jia, S , Epifanov, D , Chilikin, K , Kawasaki, T , Nakano, E , Pardi, S , Fulsom, B G , Shen, C P , S-K, Choi , Cheon, B G , Sandilya, S , Aihara, H , Russo, G , Fast, J E , Kichimi, H , Yuan, C Z , Jacobs, W W , Biswal, J , H Ye , Guido, E , Inami, K , Popov, V , Kinoshita, K , Schneider, O , Piilonen, L E , Cinabro, D , Chekelian, V , Mussa, R , Inguglia, G , Mohanty, G B , Berger, M , Tanida, K , S Di Carlo , Shwartz, B , Ban, Y , Widmann, E , W-S Hou , Kuzmin, A , Adachi, I , Watanabe, M , Libby, J , Zakharov, S , Wang, B , Kim, J B , Babu, V , Eidelman, S , Kodyš, P , Watanabe, Y , Strube, J F , Hayashii, H , Kumita, T , Ishikawa, A , Jin, Y , Lubej, M , Salehi, M , Wang, P , Dash, N , Miyata, H , Solovieva, E , Uglov, T , Lee, I S , Hayasaka, K , Iwasaki, M , Červenkov, D , Doležal, Z , Mori, T , Bhardwaj, V , Cunliffe, S , Seino, Y , Gabyshev, N , Mizuk, R , Shebalin, V , Nayak, M , Nanut, T , Ayad, R , Browder, T E , C Van Hulse , Waheed, E , Goldenzweig, P , Julius, T , Uno, S , Sanuki, T , Joo, K K , Giri, A , Bozek, A , Nakao, M , Unno, Y , Wang, X L , MacNaughton, J , Pedlar, T K , Kotchetkov, D , Merola, M , Nishida, S , Garg, R , Kim, S H , Kroeger, R , Kim, K T

in Charm (particle physics)

2018

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Observation of Ξ c ( 2930 ) 0 and updated measurement of B - → K - Λ c + Λ ¯ c - at Belle

in Charm (particle physics)

2018

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Observation of Ξ c ( 2930 ) 0 and updated measurement of B - → K - Λ c + Λ ¯ c - at Belle

in Charm (particle physics)

2018

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Journal Article

Observation of Ξ c ( 2930 ) 0 and updated measurement of B - → K - Λ c + Λ ¯ c - at Belle

Kulasiri, R,

Karyan, G,

Li, L K,

Jia, S,

Epifanov, D,

Chilikin, K,

Kawasaki, T,

Nakano, E,

Pardi, S,

Fulsom, B G,

Shen, C P,

S-K, Choi,

Cheon, B G,

Sandilya, S,

Aihara, H,

Russo, G,

Fast, J E,

Kichimi, H,

Yuan, C Z,

Jacobs, W W,

Biswal, J,

H Ye,

Guido, E,

Inami, K,

Popov, V,

Kinoshita, K,

Schneider, O,

Piilonen, L E,

Cinabro, D,

Chekelian, V,

Mussa, R,

Inguglia, G,

Mohanty, G B,

Berger, M,

Tanida, K,

S Di Carlo,

Shwartz, B,

Ban, Y,

Widmann, E,

W-S Hou,

Kuzmin, A,

Adachi, I,

Watanabe, M,

Libby, J,

Zakharov, S,

Wang, B,

Kim, J B,

Babu, V,

Eidelman, S,

Kodyš, P,

Watanabe, Y,

Strube, J F,

Hayashii, H,

Kumita, T,

Ishikawa, A,

Jin, Y,

Lubej, M,

Salehi, M,

Wang, P,

Dash, N,

Miyata, H,

Solovieva, E,

Uglov, T,

Lee, I S,

Hayasaka, K,

Iwasaki, M,

Červenkov, D,

Doležal, Z,

Mori, T,

Bhardwaj, V,

Cunliffe, S,

Seino, Y,

Gabyshev, N,

Mizuk, R,

Shebalin, V,

Nayak, M,

Nanut, T,

Ayad, R,

Browder, T E,

C Van Hulse,

Waheed, E,

Goldenzweig, P,

Julius, T,

Uno, S,

Sanuki, T,

Joo, K K,

Giri, A,

Bozek, A,

Nakao, M,

Unno, Y,

Wang, X L,

MacNaughton, J,

Pedlar, T K,

Kotchetkov, D,

Merola, M,

Nishida, S,

Garg, R,

Kim, S H,

Kroeger, R,

Kim, K T

2018

Overview

We report the first observation of the Ξc(2930)0 charmed-strange baryon with a significance greater than 5σ. The Ξc(2930)0 is found in its decay to K-Λc+ in B-→K-Λc+Λ¯c- decays. The measured mass and width are [2928.9±3.0(stat.)-12.0+0.9(syst.)] MeV/c2 and [19.5±8.4(stat.)-7.9+5.9(syst.)] MeV, respectively, and the product branching fraction is B(B-→Ξc(2930)0Λ¯c-)B(Ξc(2930)0→K-Λc+)=[1.73±0.45(stat.)±0.21(syst.)]×10-4. We also measure B(B-→K-Λc+Λ¯c-)=[4.80±0.43(stat.)±0.60(syst.)]×10-4 with improved precision, and search for the charmonium-like state Y(4660) and its spin partner, Yη, in the Λc+Λ¯c- invariant mass spectrum. No clear signals of the Y(4660) nor its spin partner are observed and the 90% credibility level (C.L.) upper limits on their production rates are determined. These measurements are obtained from a sample of (772±11)×106BB¯ pairs collected at the Υ(4S) resonance by the Belle detector at the KEKB asymmetric energy electron–positron collider.

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Publisher

Springer Nature B.V

Subject

Charm (particle physics)