Back to Search Start Over

Evidence of a structure in $$\bar{K}^{0} \Lambda _{c}^{+}$$ <math><mrow><msup><mrow><mover><mrow><mi>K</mi></mrow><mrow><mo>¯</mo></mrow></mover></mrow><mn>0</mn></msup><msubsup><mi>Λ</mi><mrow><mi>c</mi></mrow><mo>+</mo></msubsup></mrow></math> consistent with a charged $$\Xi _c(2930)^{+}$$ <math><mrow><msub><mi>Ξ</mi><mi>c</mi></msub><msup><mrow><mo>(</mo><mn>2930</mn><mo>)</mo></mrow><mo>+</mo></msup></mrow></math> , and updated measurement of $$\bar{B}^{0} \rightarrow \bar{K}^{0} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}$$ <math><mrow><msup><mrow><mover><mrow><mi>B</mi></mrow><mrow><mo>¯</mo></mrow></mover></mrow><mn>0</mn></msup><mo>→</mo><msup><mrow><mover><mrow><mi>K</mi></mrow><mrow><mo>¯</mo></mrow></mover></mrow><mn>0</mn></msup><msubsup><mi>Λ</mi><mrow><mi>c</mi></mrow><mo>+</mo></msubsup><msubsup><mover><mrow><mi>Λ</mi></mrow><mrow><mo>¯</mo></mrow></mover><mrow><mi>c</mi></mrow><mo>-</mo></msubsup></mrow></math> at Belle

Authors :
Li, Y.
Shen, C.
Adachi, I.
Aihara, H.
Al Said, S.
Asner, D.
Aushev, T.
Ayad, R.
Babu, V.
Badhrees, I.
Bahinipati, S.
Ban, Y.
Bansal, V.
Behera, P.
Beleño, C.
Bhardwaj, V.
Bhuyan, B.
Biswal, J.
Bobrov, A.
Bozek, A.
Bračko, M.
Browder, T.
Cao, L.
Červenkov, D.
Chang, P.
Chekelian, V.
Chen, A.
Cheon, B.
Chilikin, K.
Cho, K.
Choi, S.K.
Choi, Y.
Choudhury, S.
Cinabro, D.
Cunliffe, S.
Dash, N.
Carlo, S.
Dingfelder, J.
Doležal, Z.
Dong, T.
Drásal, Z.
Eidelman, S.
Epifanov, D.
Fast, J.
Fulsom, B.
Garg, R.
Gaur, V.
Gabyshev, N.
Garmash, A.
Gelb, M.
Giri, A.
Goldenzweig, P.
Golob, B.
Haba, J.
Hayasaka, K.
Hirose, S.
Hou, W.S.
Iijima, T.
Inami, K.
Inguglia, G.
Ishikawa, A.
Itoh, R.
Iwasaki, M.
Iwasaki, Y.
Jacobs, W.
Jaegle, I.
Jeon, H.
Jia, S.
Jin, Y.
Joo, K.
Kaliyar, A.
Kang, K.
Kato, Y.
Kawasaki, T.
Kim, D.
Kim, J.
Kim, S.
Kinoshita, K.
Kodyš, P.
Korpar, S.
Kotchetkov, D.
Križan, P.
Kroeger, R.
Krokovny, P.
Kuhr, T.
Kwon, Y.J.
Lange, J.
Lee, I.
Lee, S.
Li, L.
Li Gioi, L.
Libby, J.
Liventsev, D.
Luo, T.
Matvienko, D.
Merola, M.
Miyata, H.
Mizuk, R.
Moon, H.
Mori, T.
Mussa, R.
Nakano, E.
Nanut, T.
Nath, K.
Natkaniec, Z.
Nayak, M.
Nisar, N.
Nishida, S.
Nishimura, K.
Ogawa, K.
Okuno, S.
Ono, H.
Pakhlov, P.
Pakhlova, G.
Pal, B.
Pardi, S.
Park, H.
Paul, S.
Pedlar, T.
Pestotnik, R.
Piilonen, L.
Popov, V.
Prencipe, E.
Rostomyan, A.
Russo, G.
Sakai, Y.
Salehi, M.
Sandilya, S.
Santelj, L.
Sanuki, T.
Savinov, V.
Schneider, O.
Schnell, G.
Schwanda, C.
Seino, Y.
Senyo, K.
Seon, O.
Sevior, M.
Shibata, T.A.
Shiu, J.G.
Solovieva, E.
Starič, M.
Strube, J.
Sumihama, M.
Sumiyoshi, T.
Takizawa, M.
Tamponi, U.
Tanida, K.
Tenchini, F.
Uchida, M.
Uglov, T.
Unno, Y.
Uno, S.
Usov, Y.
Hulse, C.
Tonder, R.
Varner, G.
Varvell, K.
Vorobyev, V.
Waheed, E.
Wang, B.
Wang, C.
Wang, M.Z.
Wang, P.
Wang, X.
Watanuki, S.
Widmann, E.
Won, E.
Ye, H.
Yelton, J.
Yin, J.
Yuan, C.
Yusa, Y.
Zhang, Z.
Zhilich, V.
Zhukova, V.
Zhulanov, V.
Source :
European Physical Journal
Publication Year :
2018
Publisher :
Springer, 2018.

Abstract

We report evidence for the charged charmed-strange baryon $$\Xi _{c}(2930)^+$$ Ξc(2930)+ with a signal significance of 3.9$$\sigma $$ σ with systematic errors included. The charged $$\Xi _{c}(2930)^+$$ Ξc(2930)+ is found in its decay to $$K_{S}^{0} \Lambda _{c}^+$$ KS0Λc+ in the substructure of $$\bar{B}^{0} \rightarrow K^{0}_{S} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}$$ B&#175;0→KS0Λc+Λ&#175;c- decays. The measured mass and width are $$[2942.3 \pm 4.4 ({\mathrm{stat.}}) \pm {1.5}({\mathrm{syst.}})]$$ [2942.3&#177;4.4(stat.)&#177;1.5(syst.)] MeV/$$c^{2}$$ c2 and $$[14.8 \pm 8.8({\mathrm{stat.}}) \pm {2.5}({\mathrm{syst.}})]$$ [14.8&#177;8.8(stat.)&#177;2.5(syst.)] MeV, respectively, and the product branching fraction is $$\mathcal{B}(\bar{B}^{0} \rightarrow \Xi _c(2930)^{+} \bar{\Lambda }_{c}^{-}) \mathcal{B}(\Xi _c(2930)^{+}\rightarrow \bar{K}^{0} \Lambda _{c}^{+})=[2.37 \pm 0.51 ({\mathrm{stat.}})\pm 0.31({\mathrm{syst.}})]\times 10^{-4}$$ B(B&#175;0→Ξc(2930)+Λ&#175;c-)B(Ξc(2930)+→K&#175;0Λc+)=[2.37&#177;0.51(stat.)&#177;0.31(syst.)]&#215;10-4 . We also measure $$\mathcal{B}(\bar{B}^{0} \rightarrow \bar{K}^{0} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}) = [3.99 \pm 0.76({\mathrm{stat.}}) \pm 0.51({\mathrm{syst.}})] \times 10^{-4}$$ B(B&#175;0→K&#175;0Λc+Λ&#175;c-)=[3.99&#177;0.76(stat.)&#177;0.51(syst.)]&#215;10-4 with greater precision than previous experiments, and present the results of a search for the charmonium-like state Y(4660) and its spin partner, $$Y_{\eta }$$ Yη , in the $$\Lambda _{c}^{+}\bar{\Lambda }_{c}^{-}$$ Λc+Λ&#175;c- invariant mass spectrum. No clear signals of the Y(4660) or $$Y_{\eta }$$ Yη 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 $$(772\pm 11)\times 10^{6} B\bar{B}$$ (772&#177;11)&#215;106BB&#175; pairs collected at the $$\Upsilon (4S)$$ Υ(4S) resonance by the Belle detector at the KEKB asymmetric energy electron-positron collider.

Details

Language :
English
Database :
OpenAIRE
Journal :
European Physical Journal
Accession number :
edsair.od......3000..beaca14eaeb925033548f54cb04ac415