Evidence of a New Excited Charmed Baryon Decaying to Σ c (2455 ) 0,++ π ±

Journal Article · Fri Jan 20 00:00:00 EST 2023 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.130.031901· OSTI ID:2424154

Li, Y.  B.; Shen, C.  P.; Adachi, I.; Aihara, H.; Asner, D.  M.; Atmacan, H.; Aushev, T.; Ayad, R.; Babu, V.; Bahinipati, S.; Behera, P.; Belous, K.; Bennett, J.; Bessner, M.; Bhardwaj, V.; Bhuyan, B.; Bilka, T.; Bodrov, D.; Borah, J.; Bozek, A. ; Bračko, M.; Branchini, P.; Browder, T.  E.; Budano, A.; Campajola, M.; Červenkov, D.; Chang, M. -C.; Chang, P.; Cheon, B.  G.; Chilikin, K.; Cho, H.  E.; Cho, K.; Cho, S. -J.; Choi, S. -K.; Choi, Y.; Choudhury, S.; Cinabro, D.; Das, S.; De Pietro, G.; Dhamija, R.; Di Capua, F.; Dingfelder, J.; Doležal, Z.; Dong, T.  V.; Dossett, D.; Epifanov, D.; Fulsom, B.  G.; Garg, R.; Gaur, V.; Garmash, A.; Giri, A.; Goldenzweig, P.; Graziani, E.; Gu, T.; Guan, Y.; Gudkova, K.; Hadjivasiliou, C.; Hayasaka, K.; Hayashii, H.; Hou, W. -S.; Hsu, C. -L.; Iijima, T.; Inami, K.; Ipsita, N.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Iwasaki, Y.; Jacobs, W.  W.; Jang, E. -J.; Ji, Q.  P.; Jia, S.; Jin, Y.; Joo, K.  K.; Karyan, G.; Kawasaki, T.; Kichimi, H.; Kiesling, C.; Kim, C.  H.; Kim, D.  Y.; Kim, K. -H.; Kim, Y. -K.; Kindo, H.; Kinoshita, K.; Kodyš, P.; Konno, T.; Korobov, A.; Korpar, S.; Kovalenko, E.; Križan, P.; Krokovny, P.; Kumar, M.; Kumar, R.; Kumara, K.; Kwon, Y. -J.; Lam, T.; Lange, J.  S.; Laurenza, M.; Lee, S.  C.; Li, C.  H.; Li, J.; Li, L.  K.; Li, Y.; Li Gioi, L.; Libby, J.; Lieret, K.; Liventsev, D.; Masuda, M.; Matsuda, T.; Matvienko, D.; Maurya, S.  K.; Meier, F.; Merola, M.; Metzner, F.; Miyabayashi, K.; Mizuk, R.; Mohanty, G.  B.; Nakamura, I.; Nakao, M.; Natkaniec, Z.; Natochii, A.; Nayak, L.; Niiyama, M.; Nisar, N.  K.; Nishida, S.; Ogawa, S.; Ono, H.; Oskin, P.; Pakhlov, P.; Pakhlova, G.; Pardi, S.; Park, H.; Park, S. -H.; Patra, S.; Paul, S.; Pedlar, T.  K.; Pestotnik, R.; Piilonen, L.  E.; Podobnik, T.; Prencipe, E.; Prim, M.  T.; Rout, N.; Russo, G.; Sandilya, S.; Santelj, L.; Savinov, V.; Schnell, G.; Schueler, J.; Schwanda, C.; Seino, Y.; Senyo, K.; Sevior, M.  E.; Shapkin, M.; Sharma, C.; Shiu, J. -G.; Singh, J.  B.; Sokolov, A.; Solovieva, E.; Starič, M.; Stottler, Z.  S.; Sumihama, M.; Sumiyoshi, T.; Sutcliffe, W.; Takizawa, M.; Tamponi, U.; Tanida, K.; Tenchini, F.; Trabelsi, K.; Tsuboyama, T.; Uchida, M.; Uglov, T.; Unno, Y.; Uno, S.; Usov, Y.; van Tonder, R.; Varner, G.; Varvell, K.  E.; Waheed, E.; Wang, E.; Wang, M. -Z.; Watanabe, M.; Watanuki, S.; Werbycka, O.; Wiechczynski, J.; Won, E.; Yabsley, B.  D.; Yan, W.; Yang, S.  B.; Yelton, J.; Yin, J.  H.; Yuan, C.  Z.; Yusa, Y.; Zhai, Y.; Zhang, Z.  P.; Zhilich, V.; Zhukova, V.

We present the study of $$\overline{B}$$⁰→Σ_c⁢(2455)^0,++⁢π^± $$\overline{p}$$ decays based on 772×10⁶ B$$\overline{B}$$ events collected with the Belle detector at the KEKB asymmetric-energy e⁺⁢e^- collider. The Σ_c⁢(2455)^0,++ candidates are reconstructed via their decay to Λ$$^{+}_{c}$$π^∓ and Λ$$^{+}_{c}$$ decays to pK^⁢-π⁺, pK$$^{0}_{S}$$, and Λ⁢π⁺ final states. The corresponding branching fractions are measured to be $$\mathscr{B}$$⁡($$\overline{B}$$⁰→Σ_c⁢(2455)^0⁢π⁺$$\overline{p}$$)=(1.09±0.06±0.07)×10^-4 and $$\mathscr{B}$$⁡($$\overline{B}$$⁰→Σ_c⁢(2455)⁺⁺⁢π^-⁢$$\overline{p}$$)=(1.84±0.11±0.12)×10^-4, which are consistent with the world average values with improved precision. A new structure is found in the M_{Σc(2455)^0,++⁢π±} spectrum with a significance of 4.2⁢σ including systematic uncertainty. The structure is possibly an excited Λ$$^{+}_{c}$$ and is tentatively named Λ_c⁢(2910)⁺. Its mass and width are measured to be (2913.8±5.6±3.8) MeV/c² and (51.8±20.0±18.8) MeV, respectively. The products of branching fractions for the Λ_c⁢(2910)⁺ are measured to be $$\mathscr{B}$$⁡($$\overline{B}$$ ⁰→Λ_c(2910)⁺$$\overline{p}$$) × $$\mathscr{B}$$⁡(Λ_c⁢(2910)⁺→Σ_c⁢(2455)⁰π⁺)=(9.5±3.6±1.6) x 10^-6 and $$\mathscr{B}$$($$\overline{B}$$⁰→Λ_c⁢(2910)⁺⁢ $$\overline{p}$$) × $$\mathscr{B}$$⁡(Λ_c(2910)⁺→Σ_c(2455⁾⁺⁺π^-)=(1.24±0.35±0.10)×10^-5. Here, the first and second uncertainties are statistical and systematic, respectively.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• Contributing Organization: Belle Collaboration
• Grant/Contract Number: AC05-76RL01830
• OSTI ID: 2424154
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 3 Vol. 130; ISSN 0031-9007
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

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