First Observation of Λπ+ and Λπ- Signals near the K ¯ N (I=1) Mass Threshold in Λc+ → Λπ+π+π- Decay

Y. Ma; J. Yelton; K. Tanida; I. Adachi; J. K. Ahn; H. Aihara; S. Al Said; D. M. Asner; H. Atmacan; T. Aushev; R. Ayad; V. Babu; S. Bahinipati; Sw Banerjee; P. Behera; K. Belous; J. Bennett; M. Bessner; B. Bhuyan; T. Bilka; D. Biswas; A. Bobrov; D. Bodrov; J. Borah; A. Bozek; M. Bračko; P. Branchini; T. E. Browder; A. Budano; M. Campajola; D. Červenkov; M. C. Chang; 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. Das; G. De Nardo; G. De Pietro; R. Dhamija; F. Di Capua; J. Dingfelder; Z. DoleŽal; T. V. Dong; D. Epifanov; T. Ferber; D. Ferlewicz; B. G. Fulsom; R. Garg; V. Gaur; A. Garmash; A. Giri; P. Goldenzweig; B. Golob; E. Graziani; K. Gudkova; C. Hadjivasiliou; S. Halder; K. Hayasaka; H. Hayashii; M. T. Hedges; W. S. Hou; C. L. Hsu; K. Inami; N. Ipsita; A. Ishikawa; R. Itoh; M. Iwasaki; W. W. Jacobs; E. J. Jang; S. Jia; Y. Jin; A. B. Kaliyar; K. H. Kang; T. Kawasaki; C. Kiesling; C. H. Kim; D. Y. Kim; Y. K. Kim; K. Kinoshita; P. Kodyš; A. Korobov; S. Korpar; E. Kovalenko; P. KriŽan; P. Krokovny; R. Kumar; K. Kumara; Y. J. Kwon; T. Lam; J. S. Lange; S. C. Lee; P. Lewis; L. K. Li; Y. Li; L. Li Gioi; J. Libby; K. Lieret; Y. R. Lin; D. Liventsev; T. Luo; M. Masuda; T. Matsuda; D. Matvienko; S. K. Maurya; F. Meier; M. Merola; F. Metzner; K. Miyabayashi; G. B. Mohanty; R. Mussa; I. Nakamura; T. Nakano; M. Nakao; Z. Natkaniec; A. Natochii; L. Nayak; M. Nayak; N. K. Nisar; S. Nishida; S. Ogawa; H. Ono; P. Oskin; P. Pakhlov; G. Pakhlova; S. Pardi; H. Park; J. Park; S. Patra; S. Paul; R. Pestotnik; L. E. Piilonen; T. Podobnik; E. Prencipe; M. T. Prim; A. Rostomyan; N. Rout; G. Russo; S. Sandilya; L. Santelj; V. Savinov; G. Schnell; J. Schueler; C. Schwanda; Y. Seino; K. Senyo; M. E. Sevior; W. Shan; M. Shapkin; C. Sharma; C. P. Shen; J. G. Shiu; F. Simon; A. Sokolov; E. Solovieva; M. Starič; M. Sumihama; T. Sumiyoshi; W. Sutcliffe; M. Takizawa; U. Tamponi; F. Tenchini; M. Uchida; S. Uehara; T. Uglov; Y. Unno; K. Uno; S. Uno; P. Urquijo; Y. Usov; S. E. Vahsen; R. Van Tonder; G. Varner; A. Vinokurova; A. Vossen; D. Wang; M. Z. Wang; M. Watanabe; S. Watanuki; O. Werbycka; E. Won; X. Xu; B. D. Yabsley; W. Yan; S. B. Yang; J. H. Yin; C. Z. Yuan; L. Yuan; Z. P. Zhang; V. Zhilich; V. Zhukova

doi:10.1103/PhysRevLett.130.151903

First Observation of Λπ+ and Λπ- Signals near the K ¯ N (I=1) Mass Threshold in Λc+ → Λπ+π+π- Decay

Y. Ma, J. Yelton, K. Tanida, I. Adachi, J. K. Ahn, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, T. Aushev, R. Ayad, V. Babu, S. Bahinipati, Sw Banerjee, P. Behera, K. Belous, J. Bennett, M. Bessner, B. Bhuyan, T. BilkaD. Biswas, A. Bobrov, D. Bodrov, J. Borah, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, M. Campajola, D. Červenkov, M. C. Chang, 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. Das, G. De Nardo, G. De Pietro, R. Dhamija, F. Di Capua, J. Dingfelder, Z. DoleŽal, T. V. Dong, D. Epifanov, T. Ferber, D. Ferlewicz, B. G. Fulsom, R. Garg, V. Gaur, A. Garmash, A. Giri, P. Goldenzweig, B. Golob, E. Graziani, K. Gudkova, C. Hadjivasiliou, S. Halder, K. Hayasaka, H. Hayashii, M. T. Hedges, W. S. Hou, C. L. Hsu, K. Inami, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, E. J. Jang, S. Jia, Y. Jin, A. B. Kaliyar, K. H. Kang, T. Kawasaki, C. Kiesling, C. H. Kim, D. Y. Kim, Y. K. Kim, K. Kinoshita, P. Kodyš, A. Korobov, S. Korpar, E. Kovalenko, P. KriŽan, P. Krokovny, R. Kumar, K. Kumara, Y. J. Kwon, T. Lam, J. S. Lange, S. C. Lee, P. Lewis, L. K. Li, Y. Li, L. Li Gioi, J. Libby, K. Lieret, Y. R. Lin, D. Liventsev, T. Luo, M. Masuda, T. Matsuda, D. Matvienko, S. K. Maurya, F. Meier, M. Merola, F. Metzner, K. Miyabayashi, G. B. Mohanty, R. Mussa, I. Nakamura, T. Nakano, M. Nakao, Z. Natkaniec, A. Natochii, L. Nayak, M. Nayak, N. K. Nisar, S. Nishida, S. Ogawa, H. Ono, P. Oskin, P. Pakhlov, G. Pakhlova, S. Pardi, H. Park, J. Park, S. Patra, S. Paul, R. Pestotnik, L. E. Piilonen, T. Podobnik, E. Prencipe, M. T. Prim, A. Rostomyan, N. Rout, G. Russo, S. Sandilya, L. Santelj, V. Savinov, G. Schnell, J. Schueler, C. Schwanda, Y. Seino, K. Senyo, M. E. Sevior, W. Shan, M. Shapkin, C. Sharma, C. P. Shen, J. G. Shiu, F. Simon, A. Sokolov, E. Solovieva, M. Starič, M. Sumihama, T. Sumiyoshi, W. Sutcliffe, M. Takizawa, U. Tamponi, F. Tenchini, M. Uchida, S. Uehara, T. Uglov, Y. Unno, K. Uno, S. Uno, P. Urquijo, Y. Usov, S. E. Vahsen, R. Van Tonder, G. Varner, A. Vinokurova, A. Vossen, D. Wang, M. Z. Wang, M. Watanabe, S. Watanuki, O. Werbycka, E. Won, X. Xu, B. D. Yabsley, W. Yan, S. B. Yang, J. H. Yin, C. Z. Yuan, L. Yuan, Z. P. Zhang, V. Zhilich, V. Zhukova

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

Using the data sample of 980 fb-1 collected with the Belle detector operating at the KEKB asymmetric-energy e+e- collider, we present the results of an investigation of the Λπ+ and Λπ- invariant mass distributions looking for substructure in the decay Λc+→Λπ+π+π-. We find a significant signal in each mass distribution. When interpreted as resonances, we find for the Λπ+ (Λπ-) combination a mass of 1434.3±0.6(stat)±0.9(syst) MeV/c2 [1438.5±0.9(stat)±2.5(syst) MeV/c2], an intrinsic width of 11.5±2.8(stat)±5.3(syst) MeV/c2 [33.0±7.5(stat)±23.6(syst) MeV/c2] with a significance of 7.5σ (6.2σ). As these two signals are very close to the K̄N threshold, we also investigate the possibility of a K̄N cusp, and find that we cannot discriminate between these two interpretations due to the limited size of the data sample.

Original language	English
Article number	151903
Journal	Physical Review Letters
Volume	130
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevLett.130.151903
State	Published - 14 Apr 2023

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10.1103/PhysRevLett.130.151903

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Ma, Y., Yelton, J., Tanida, K., Adachi, I., Ahn, J. K., Aihara, H., Al Said, S., Asner, D. M., Atmacan, H., Aushev, T., Ayad, R., Babu, V., Bahinipati, S., Banerjee, S., Behera, P., Belous, K., Bennett, J., Bessner, M., Bhuyan, B., ... Zhukova, V. (2023). First Observation of Λπ+ and Λπ- Signals near the K ¯ N (I=1) Mass Threshold in Λc+ → Λπ+π+π- Decay. Physical Review Letters, 130(15), Article 151903. https://doi.org/10.1103/PhysRevLett.130.151903

@article{56455b1db360467eb69a657b84038b9b,

title = "First Observation of Λπ+ and Λπ- Signals near the K ¯ N (I=1) Mass Threshold in Λc+ → Λπ+π+π- Decay",

abstract = "Using the data sample of 980 fb-1 collected with the Belle detector operating at the KEKB asymmetric-energy e+e- collider, we present the results of an investigation of the Λπ+ and Λπ- invariant mass distributions looking for substructure in the decay Λc+→Λπ+π+π-. We find a significant signal in each mass distribution. When interpreted as resonances, we find for the Λπ+ (Λπ-) combination a mass of 1434.3±0.6(stat)±0.9(syst) MeV/c2 [1438.5±0.9(stat)±2.5(syst) MeV/c2], an intrinsic width of 11.5±2.8(stat)±5.3(syst) MeV/c2 [33.0±7.5(stat)±23.6(syst) MeV/c2] with a significance of 7.5σ (6.2σ). As these two signals are very close to the {\=K}N threshold, we also investigate the possibility of a {\=K}N cusp, and find that we cannot discriminate between these two interpretations due to the limited size of the data sample.",

author = "Y. Ma and J. Yelton and K. Tanida and I. Adachi and Ahn, {J. K.} and H. Aihara and {Al Said}, S. and Asner, {D. M.} and H. Atmacan and T. Aushev and R. Ayad and V. Babu and S. Bahinipati and Sw Banerjee and P. Behera and K. Belous and J. Bennett and M. Bessner and B. Bhuyan and T. Bilka and D. Biswas and A. Bobrov and D. Bodrov and J. Borah and A. Bozek and M. Bra{\v c}ko and P. Branchini and Browder, {T. E.} and A. Budano and M. Campajola and D. {\v C}ervenkov and Chang, {M. C.} and A. Chen and Cheon, {B. G.} and K. Chilikin and Cho, {H. E.} and K. Cho and Cho, {S. J.} and Choi, {S. K.} and Y. Choi and S. Choudhury and D. Cinabro and S. Das and {De Nardo}, G. and {De Pietro}, G. and R. Dhamija and {Di Capua}, F. and J. Dingfelder and Z. Dole{\v Z}al and Dong, {T. V.} and D. Epifanov and T. Ferber and D. Ferlewicz and Fulsom, {B. G.} and R. Garg and V. Gaur and A. Garmash and A. Giri and P. Goldenzweig and B. Golob and E. Graziani and K. Gudkova and C. Hadjivasiliou and S. Halder and K. Hayasaka and H. Hayashii and Hedges, {M. T.} and Hou, {W. S.} and Hsu, {C. L.} and K. Inami and N. Ipsita and A. Ishikawa and R. Itoh and M. Iwasaki and Jacobs, {W. W.} and Jang, {E. J.} and S. Jia and Y. Jin and Kaliyar, {A. B.} and Kang, {K. H.} and T. Kawasaki and C. Kiesling and Kim, {C. H.} and Kim, {D. Y.} and Kim, {Y. K.} and K. Kinoshita and P. Kody{\v s} and A. Korobov and S. Korpar and E. Kovalenko and P. Kri{\v Z}an and P. Krokovny and R. Kumar and K. Kumara and Kwon, {Y. J.} and T. Lam and Lange, {J. S.} and Lee, {S. C.} and P. Lewis and Li, {L. K.} and Y. Li and {Li Gioi}, L. and J. Libby and K. Lieret and Lin, {Y. R.} and D. Liventsev and T. Luo and M. Masuda and T. Matsuda and D. Matvienko and Maurya, {S. K.} and F. Meier and M. Merola and F. Metzner and K. Miyabayashi and Mohanty, {G. B.} and R. Mussa and I. Nakamura and T. Nakano and M. Nakao and Z. Natkaniec and A. Natochii and L. Nayak and M. Nayak and Nisar, {N. K.} and S. Nishida and S. Ogawa and H. Ono and P. Oskin and P. Pakhlov and G. Pakhlova and S. Pardi and H. Park and J. Park and S. Patra and S. Paul and R. Pestotnik and Piilonen, {L. E.} and T. Podobnik and E. Prencipe and Prim, {M. T.} and A. Rostomyan and N. Rout and G. Russo and S. Sandilya and L. Santelj and V. Savinov and G. Schnell and J. Schueler and C. Schwanda and Y. Seino and K. Senyo and Sevior, {M. E.} and W. Shan and M. Shapkin and C. Sharma and Shen, {C. P.} and Shiu, {J. G.} and F. Simon and A. Sokolov and E. Solovieva and M. Stari{\v c} and M. Sumihama and T. Sumiyoshi and W. Sutcliffe and M. Takizawa and U. Tamponi and F. Tenchini and M. Uchida and S. Uehara and T. Uglov and Y. Unno and K. Uno and S. Uno and P. Urquijo and Y. Usov and Vahsen, {S. E.} and {Van Tonder}, R. and G. Varner and A. Vinokurova and A. Vossen and D. Wang and Wang, {M. Z.} and M. Watanabe and S. Watanuki and O. Werbycka and E. Won and X. Xu and Yabsley, {B. D.} and W. Yan and Yang, {S. B.} and Yin, {J. H.} and Yuan, {C. Z.} and L. Yuan and Zhang, {Z. P.} and V. Zhilich and V. Zhukova",

note = "Publisher Copyright: {\textcopyright} 2023 authors. Published by the American Physical Society.",

year = "2023",

month = apr,

day = "14",

doi = "10.1103/PhysRevLett.130.151903",

language = "English",

volume = "130",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "15",

}

Ma, Y, Yelton, J, Tanida, K, Adachi, I, Ahn, JK, Aihara, H, Al Said, S, Asner, DM, Atmacan, H, Aushev, T, Ayad, R, Babu, V, Bahinipati, S, Banerjee, S, Behera, P, Belous, K, Bennett, J, Bessner, M, Bhuyan, B, Bilka, T, Biswas, D, Bobrov, A, Bodrov, D, Borah, J, Bozek, A, Bračko, M, Branchini, P, Browder, TE, Budano, A, Campajola, M, Červenkov, D, Chang, MC, Chen, A, Cheon, BG, Chilikin, K, Cho, HE, Cho, K, Cho, SJ, Choi, SK, Choi, Y, Choudhury, S, Cinabro, D, Das, S, De Nardo, G, De Pietro, G, Dhamija, R, Di Capua, F, Dingfelder, J, DoleŽal, Z, Dong, TV, Epifanov, D, Ferber, T, Ferlewicz, D, Fulsom, BG, Garg, R, Gaur, V, Garmash, A, Giri, A, Goldenzweig, P, Golob, B, Graziani, E, Gudkova, K, Hadjivasiliou, C, Halder, S, Hayasaka, K, Hayashii, H, Hedges, MT, Hou, WS, Hsu, CL, Inami, K, Ipsita, N, Ishikawa, A, Itoh, R, Iwasaki, M, Jacobs, WW, Jang, EJ, Jia, S, Jin, Y, Kaliyar, AB, Kang, KH, Kawasaki, T, Kiesling, C, Kim, CH, Kim, DY, Kim, YK, Kinoshita, K, Kodyš, P, Korobov, A, Korpar, S, Kovalenko, E, KriŽan, P, Krokovny, P, Kumar, R, Kumara, K, Kwon, YJ, Lam, T, Lange, JS, Lee, SC, Lewis, P, Li, LK, Li, Y, Li Gioi, L, Libby, J, Lieret, K, Lin, YR, Liventsev, D, Luo, T, Masuda, M, Matsuda, T, Matvienko, D, Maurya, SK, Meier, F, Merola, M, Metzner, F, Miyabayashi, K, Mohanty, GB, Mussa, R, Nakamura, I, Nakano, T, Nakao, M, Natkaniec, Z, Natochii, A, Nayak, L, Nayak, M, Nisar, NK, Nishida, S, Ogawa, S, Ono, H, Oskin, P, Pakhlov, P, Pakhlova, G, Pardi, S, Park, H, Park, J, Patra, S, Paul, S, Pestotnik, R, Piilonen, LE, Podobnik, T, Prencipe, E, Prim, MT, Rostomyan, A, Rout, N, Russo, G, Sandilya, S, Santelj, L, Savinov, V, Schnell, G, Schueler, J, Schwanda, C, Seino, Y, Senyo, K, Sevior, ME, Shan, W, Shapkin, M, Sharma, C, Shen, CP, Shiu, JG, Simon, F, Sokolov, A, Solovieva, E, Starič, M, Sumihama, M, Sumiyoshi, T, Sutcliffe, W, Takizawa, M, Tamponi, U, Tenchini, F, Uchida, M, Uehara, S, Uglov, T, Unno, Y, Uno, K, Uno, S, Urquijo, P, Usov, Y, Vahsen, SE, Van Tonder, R, Varner, G, Vinokurova, A, Vossen, A, Wang, D, Wang, MZ, Watanabe, M, Watanuki, S, Werbycka, O, Won, E, Xu, X, Yabsley, BD, Yan, W, Yang, SB, Yin, JH, Yuan, CZ, Yuan, L, Zhang, ZP, Zhilich, V & Zhukova, V 2023, 'First Observation of Λπ+ and Λπ- Signals near the K ¯ N (I=1) Mass Threshold in Λc+ → Λπ+π+π- Decay', Physical Review Letters, vol. 130, no. 15, 151903. https://doi.org/10.1103/PhysRevLett.130.151903

TY - JOUR

T1 - First Observation of Λπ+ and Λπ- Signals near the K ¯ N (I=1) Mass Threshold in Λc+ → Λπ+π+π- Decay

AU - Ma, Y.

AU - Yelton, J.

AU - Tanida, K.

AU - Adachi, I.

AU - Ahn, J. K.

AU - Aihara, H.

AU - Al Said, S.

AU - Asner, D. M.

AU - Atmacan, H.

AU - Aushev, T.

AU - Ayad, R.

AU - Babu, V.

AU - Bahinipati, S.

AU - Banerjee, Sw

AU - Behera, P.

AU - Belous, K.

AU - Bennett, J.

AU - Bessner, M.

AU - Bhuyan, B.

AU - Bilka, T.

AU - Biswas, D.

AU - Bobrov, A.

AU - Bodrov, D.

AU - Borah, J.

AU - Bozek, A.

AU - Bračko, M.

AU - Branchini, P.

AU - Browder, T. E.

AU - Budano, A.

AU - Campajola, M.

AU - Červenkov, D.

AU - Chang, M. C.

AU - Chen, A.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Cho, H. E.

AU - Cho, K.

AU - Cho, S. J.

AU - Choi, S. K.

AU - Choi, Y.

AU - Choudhury, S.

AU - Cinabro, D.

AU - Das, S.

AU - De Nardo, G.

AU - De Pietro, G.

AU - Dhamija, R.

AU - Di Capua, F.

AU - Dingfelder, J.

AU - DoleŽal, Z.

AU - Dong, T. V.

AU - Epifanov, D.

AU - Ferber, T.

AU - Ferlewicz, D.

AU - Fulsom, B. G.

AU - Garg, R.

AU - Gaur, V.

AU - Garmash, A.

AU - Giri, A.

AU - Goldenzweig, P.

AU - Golob, B.

AU - Graziani, E.

AU - Gudkova, K.

AU - Hadjivasiliou, C.

AU - Halder, S.

AU - Hayasaka, K.

AU - Hayashii, H.

AU - Hedges, M. T.

AU - Hou, W. S.

AU - Hsu, C. L.

AU - Inami, K.

AU - Ipsita, N.

AU - Ishikawa, A.

AU - Itoh, R.

AU - Iwasaki, M.

AU - Jacobs, W. W.

AU - Jang, E. J.

AU - Jia, S.

AU - Jin, Y.

AU - Kaliyar, A. B.

AU - Kang, K. H.

AU - Kawasaki, T.

AU - Kiesling, C.

AU - Kim, C. H.

AU - Kim, D. Y.

AU - Kim, Y. K.

AU - Kinoshita, K.

AU - Kodyš, P.

AU - Korobov, A.

AU - Korpar, S.

AU - Kovalenko, E.

AU - KriŽan, P.

AU - Krokovny, P.

AU - Kumar, R.

AU - Kumara, K.

AU - Kwon, Y. J.

AU - Lam, T.

AU - Lange, J. S.

AU - Lee, S. C.

AU - Lewis, P.

AU - Li, L. K.

AU - Li, Y.

AU - Li Gioi, L.

AU - Libby, J.

AU - Lieret, K.

AU - Lin, Y. R.

AU - Liventsev, D.

AU - Luo, T.

AU - Masuda, M.

AU - Matsuda, T.

AU - Matvienko, D.

AU - Maurya, S. K.

AU - Meier, F.

AU - Merola, M.

AU - Metzner, F.

AU - Miyabayashi, K.

AU - Mohanty, G. B.

AU - Mussa, R.

AU - Nakamura, I.

AU - Nakano, T.

AU - Nakao, M.

AU - Natkaniec, Z.

AU - Natochii, A.

AU - Nayak, L.

AU - Nayak, M.

AU - Nisar, N. K.

AU - Nishida, S.

AU - Ogawa, S.

AU - Ono, H.

AU - Oskin, P.

AU - Pakhlov, P.

AU - Pakhlova, G.

AU - Pardi, S.

AU - Park, H.

AU - Park, J.

AU - Patra, S.

AU - Paul, S.

AU - Pestotnik, R.

AU - Piilonen, L. E.

AU - Podobnik, T.

AU - Prencipe, E.

AU - Prim, M. T.

AU - Rostomyan, A.

AU - Rout, N.

AU - Russo, G.

AU - Sandilya, S.

AU - Santelj, L.

AU - Savinov, V.

AU - Schnell, G.

AU - Schueler, J.

AU - Schwanda, C.

AU - Seino, Y.

AU - Senyo, K.

AU - Sevior, M. E.

AU - Shan, W.

AU - Shapkin, M.

AU - Sharma, C.

AU - Shen, C. P.

AU - Shiu, J. G.

AU - Simon, F.

AU - Sokolov, A.

AU - Solovieva, E.

AU - Starič, M.

AU - Sumihama, M.

AU - Sumiyoshi, T.

AU - Sutcliffe, W.

AU - Takizawa, M.

AU - Tamponi, U.

AU - Tenchini, F.

AU - Uchida, M.

AU - Uehara, S.

AU - Uglov, T.

AU - Unno, Y.

AU - Uno, K.

AU - Uno, S.

AU - Urquijo, P.

AU - Usov, Y.

AU - Vahsen, S. E.

AU - Van Tonder, R.

AU - Varner, G.

AU - Vinokurova, A.

AU - Vossen, A.

AU - Wang, D.

AU - Wang, M. Z.

AU - Watanabe, M.

AU - Watanuki, S.

AU - Werbycka, O.

AU - Won, E.

AU - Xu, X.

AU - Yabsley, B. D.

AU - Yan, W.

AU - Yang, S. B.

AU - Yin, J. H.

AU - Yuan, C. Z.

AU - Yuan, L.

AU - Zhang, Z. P.

AU - Zhilich, V.

AU - Zhukova, V.

PY - 2023/4/14

Y1 - 2023/4/14

N2 - Using the data sample of 980 fb-1 collected with the Belle detector operating at the KEKB asymmetric-energy e+e- collider, we present the results of an investigation of the Λπ+ and Λπ- invariant mass distributions looking for substructure in the decay Λc+→Λπ+π+π-. We find a significant signal in each mass distribution. When interpreted as resonances, we find for the Λπ+ (Λπ-) combination a mass of 1434.3±0.6(stat)±0.9(syst) MeV/c2 [1438.5±0.9(stat)±2.5(syst) MeV/c2], an intrinsic width of 11.5±2.8(stat)±5.3(syst) MeV/c2 [33.0±7.5(stat)±23.6(syst) MeV/c2] with a significance of 7.5σ (6.2σ). As these two signals are very close to the K̄N threshold, we also investigate the possibility of a K̄N cusp, and find that we cannot discriminate between these two interpretations due to the limited size of the data sample.

AB - Using the data sample of 980 fb-1 collected with the Belle detector operating at the KEKB asymmetric-energy e+e- collider, we present the results of an investigation of the Λπ+ and Λπ- invariant mass distributions looking for substructure in the decay Λc+→Λπ+π+π-. We find a significant signal in each mass distribution. When interpreted as resonances, we find for the Λπ+ (Λπ-) combination a mass of 1434.3±0.6(stat)±0.9(syst) MeV/c2 [1438.5±0.9(stat)±2.5(syst) MeV/c2], an intrinsic width of 11.5±2.8(stat)±5.3(syst) MeV/c2 [33.0±7.5(stat)±23.6(syst) MeV/c2] with a significance of 7.5σ (6.2σ). As these two signals are very close to the K̄N threshold, we also investigate the possibility of a K̄N cusp, and find that we cannot discriminate between these two interpretations due to the limited size of the data sample.

UR - http://www.scopus.com/inward/record.url?scp=85152903586&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.130.151903

DO - 10.1103/PhysRevLett.130.151903

M3 - Article

C2 - 37115880

AN - SCOPUS:85152903586

SN - 0031-9007

VL - 130

JO - Physical Review Letters

JF - Physical Review Letters

IS - 15

M1 - 151903

ER -

First Observation of Λπ+ and Λπ- Signals near the K ¯ N (I=1) Mass Threshold in Λc+ → Λπ+π+π- Decay

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