Observation of a near-threshold enhancement in the e+e- →Λc+Λc- Cross section using initial-state radiation

G. Pakhlova; I. Adachi; H. Aihara; K. Arinstein; V. Aulchenko; T. Aushev; A. M. Bakich; V. Balagura; I. Bedny; V. Bhardwaj; U. Bitenc; A. Bondar; A. Bozek; M. Bračko; J. Brodzicka; T. E. Browder; P. Chang; A. Chen; B. G. Cheon; C. C. Chiang; R. Chistov; I. S. Cho; S. K. Choi; Y. Choi; J. Dalseno; M. Danilov; M. Dash; S. Eidelman; N. Gabyshev; H. Ha; J. Haba; K. Hayasaka; M. Hazumi; D. Heffernan; Y. Hoshi; W. S. Hou; Y. B. Hsiung; H. J. Hyun; T. Iijima; K. Inami; A. Ishikawa; H. Ishino; R. Itoh; M. Iwasaki; Y. Iwasaki; D. H. Kah; J. H. Kang; N. Katayama; H. Kawai; T. Kawasaki; H. Kichimi; H. J. Kim; H. O. Kim; S. K. Kim; Y. I. Kim; Y. J. Kim; K. Kinoshita; P. Križan; P. Krokovny; R. Kumar; A. Kuzmin; Y. J. Kwon; S. H. Kyeong; J. S. Lange; J. S. Lee; S. E. Lee; T. Lesiak; J. Li; A. Limosani; C. Liu; D. Liventsev; F. Mandl; A. Matyja; K. Miyabayashi; H. Miyata; Y. Miyazaki; R. Mizuk; T. Mori; E. Nakano; M. Nakao; Z. Natkaniec; S. Nishida; O. Nitoh; S. Noguchi; S. Ogawa; T. Ohshima; S. Okuno; S. L. Olsen; H. Ozaki; P. Pakhlov; H. Palka; C. W. Park; H. Park; H. K. Park; L. S. Peak; L. E. Piilonen; A. Poluektov; H. Sahoo; Y. Sakai; O. Schneider; K. Senyo; M. Shapkin; C. P. Shen; J. G. Shiu; B. Shwartz; J. B. Singh; A. Sokolov; S. Stanič; M. Starič; T. Sumiyoshi; M. Tanaka; G. N. Taylor; Y. Teramoto; I. Tikhomirov; S. Uehara; T. Uglov; Y. Unno; S. Uno; P. Urquijo; Y. Usov; G. Varner; C. H. Wang; M. Z. Wang; P. Wang; X. L. Wang; Y. Watanabe; R. Wedd; E. Won; B. D. Yabsley; Y. Yamashita; M. Yamauchi; C. Z. Yuan; C. C. Zhang; Z. P. Zhang; V. Zhilich; V. Zhulanov; T. Zivko; A. Zupanc; O. Zyukova

doi:10.1103/PhysRevLett.101.172001

Observation of a near-threshold enhancement in the e+e- →Λc+Λc- Cross section using initial-state radiation

G. Pakhlova, I. Adachi, H. Aihara, K. Arinstein, V. Aulchenko, T. Aushev, A. M. Bakich, V. Balagura, I. Bedny, V. Bhardwaj, U. Bitenc, A. Bondar, A. Bozek, M. Bračko, J. Brodzicka, T. E. Browder, P. Chang, A. Chen, B. G. Cheon, C. C. ChiangR. Chistov, I. S. Cho, S. K. Choi, Y. Choi, J. Dalseno, M. Danilov, M. Dash, S. Eidelman, N. Gabyshev, H. Ha, J. Haba, K. Hayasaka, M. Hazumi, D. Heffernan, Y. Hoshi, W. S. Hou, Y. B. Hsiung, H. J. Hyun, T. Iijima, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, M. Iwasaki, Y. Iwasaki, D. H. Kah, J. H. Kang, N. Katayama, H. Kawai, T. Kawasaki, H. Kichimi, H. J. Kim, H. O. Kim, S. K. Kim, Y. I. Kim, Y. J. Kim, K. Kinoshita, P. Križan, P. Krokovny, R. Kumar, A. Kuzmin, Y. J. Kwon, S. H. Kyeong, J. S. Lange, J. S. Lee, S. E. Lee, T. Lesiak, J. Li, A. Limosani, C. Liu, D. Liventsev, F. Mandl, A. Matyja, K. Miyabayashi, H. Miyata, Y. Miyazaki, R. Mizuk, T. Mori, E. Nakano, M. Nakao, Z. Natkaniec, S. Nishida, O. Nitoh, S. Noguchi, S. Ogawa, T. Ohshima, S. Okuno, S. L. Olsen, H. Ozaki, P. Pakhlov, H. Palka, C. W. Park, H. Park, H. K. Park, L. S. Peak, L. E. Piilonen, A. Poluektov, H. Sahoo, Y. Sakai, O. Schneider, K. Senyo, M. Shapkin, C. P. Shen, J. G. Shiu, B. Shwartz, J. B. Singh, A. Sokolov, S. Stanič, M. Starič, T. Sumiyoshi, M. Tanaka, G. N. Taylor, Y. Teramoto, I. Tikhomirov, S. Uehara, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Usov, G. Varner, C. H. Wang, M. Z. Wang, P. Wang, X. L. Wang, Y. Watanabe, R. Wedd, E. Won, B. D. Yabsley, Y. Yamashita, M. Yamauchi, C. Z. Yuan, C. C. Zhang, Z. P. Zhang, V. Zhilich, V. Zhulanov, T. Zivko, A. Zupanc, O. Zyukova

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Abstract

We report a measurement of the exclusive e+e-→Λc+Λc- cross section as a function of center-of-mass energy near the Λc+Λc- threshold. A clear peak with a significance of 8.2σ is observed in the Λc+Λc- invariant mass distribution just above threshold. With an assumption of a resonance origin for the observed peak, a mass and width of M=[4634-7+8(stat)-8+5(syst)]MeV/c2 and Γtot=[92- 24+40(stat)-21+10(syst)]MeV are determined. The analysis is based on a study of events with initial-state-radiation photons in a data sample collected with the Belle detector at the Υ(4S) resonance and nearby continuum with an integrated luminosity of 695fb-1 at the KEKB asymmetric-energy e+e- collider.

Original language	English
Article number	172001
Journal	Physical Review Letters
Volume	101
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevLett.101.172001
State	Published - 24 Oct 2008

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10.1103/PhysRevLett.101.172001

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Pakhlova, G., Adachi, I., Aihara, H., Arinstein, K., Aulchenko, V., Aushev, T., Bakich, A. M., Balagura, V., Bedny, I., Bhardwaj, V., Bitenc, U., Bondar, A., Bozek, A., Bračko, M., Brodzicka, J., Browder, T. E., Chang, P., Chen, A., Cheon, B. G., ... Zyukova, O. (2008). Observation of a near-threshold enhancement in the e+e- →Λc+Λc- Cross section using initial-state radiation. Physical Review Letters, 101(17), Article 172001. https://doi.org/10.1103/PhysRevLett.101.172001

@article{3338b9da3e664dd0aabbc8d4f86d99fa,

title = "Observation of a near-threshold enhancement in the e+e- →Λc+Λc- Cross section using initial-state radiation",

abstract = "We report a measurement of the exclusive e+e-→Λc+Λc- cross section as a function of center-of-mass energy near the Λc+Λc- threshold. A clear peak with a significance of 8.2σ is observed in the Λc+Λc- invariant mass distribution just above threshold. With an assumption of a resonance origin for the observed peak, a mass and width of M=[4634-7+8(stat)-8+5(syst)]MeV/c2 and Γtot=[92- 24+40(stat)-21+10(syst)]MeV are determined. The analysis is based on a study of events with initial-state-radiation photons in a data sample collected with the Belle detector at the Υ(4S) resonance and nearby continuum with an integrated luminosity of 695fb-1 at the KEKB asymmetric-energy e+e- collider.",

author = "G. Pakhlova and I. Adachi and H. Aihara and K. Arinstein and V. Aulchenko and T. Aushev and Bakich, {A. M.} and V. Balagura and I. Bedny and V. Bhardwaj and U. Bitenc and A. Bondar and A. Bozek and M. Bra{\v c}ko and J. Brodzicka and Browder, {T. E.} and P. Chang and A. Chen and Cheon, {B. G.} and Chiang, {C. C.} and R. Chistov and Cho, {I. S.} and Choi, {S. K.} and Y. Choi and J. Dalseno and M. Danilov and M. Dash and S. Eidelman and N. Gabyshev and H. Ha and J. Haba and K. Hayasaka and M. Hazumi and D. Heffernan and Y. Hoshi and Hou, {W. S.} and Hsiung, {Y. B.} and Hyun, {H. J.} and T. Iijima and K. Inami and A. Ishikawa and H. Ishino and R. Itoh and M. Iwasaki and Y. Iwasaki and Kah, {D. H.} and Kang, {J. H.} and N. Katayama and H. Kawai and T. Kawasaki and H. Kichimi and Kim, {H. J.} and Kim, {H. O.} and Kim, {S. K.} and Kim, {Y. I.} and Kim, {Y. J.} and K. Kinoshita and P. Kri{\v z}an and P. Krokovny and R. Kumar and A. Kuzmin and Kwon, {Y. J.} and Kyeong, {S. H.} and Lange, {J. S.} and Lee, {J. S.} and Lee, {S. E.} and T. Lesiak and J. Li and A. Limosani and C. Liu and D. Liventsev and F. Mandl and A. Matyja and K. Miyabayashi and H. Miyata and Y. Miyazaki and R. Mizuk and T. Mori and E. Nakano and M. Nakao and Z. Natkaniec and S. Nishida and O. Nitoh and S. Noguchi and S. Ogawa and T. Ohshima and S. Okuno and Olsen, {S. L.} and H. Ozaki and P. Pakhlov and H. Palka and Park, {C. W.} and H. Park and Park, {H. K.} and Peak, {L. S.} and Piilonen, {L. E.} and A. Poluektov and H. Sahoo and Y. Sakai and O. Schneider and K. Senyo and M. Shapkin and Shen, {C. P.} and Shiu, {J. G.} and B. Shwartz and Singh, {J. B.} and A. Sokolov and S. Stani{\v c} and M. Stari{\v c} and T. Sumiyoshi and M. Tanaka and Taylor, {G. N.} and Y. Teramoto and I. Tikhomirov and S. Uehara and T. Uglov and Y. Unno and S. Uno and P. Urquijo and Y. Usov and G. Varner and Wang, {C. H.} and Wang, {M. Z.} and P. Wang and Wang, {X. L.} and Y. Watanabe and R. Wedd and E. Won and Yabsley, {B. D.} and Y. Yamashita and M. Yamauchi and Yuan, {C. Z.} and Zhang, {C. C.} and Zhang, {Z. P.} and V. Zhilich and V. Zhulanov and T. Zivko and A. Zupanc and O. Zyukova",

year = "2008",

month = oct,

day = "24",

doi = "10.1103/PhysRevLett.101.172001",

language = "English",

volume = "101",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "17",

}

Pakhlova, G, Adachi, I, Aihara, H, Arinstein, K, Aulchenko, V, Aushev, T, Bakich, AM, Balagura, V, Bedny, I, Bhardwaj, V, Bitenc, U, Bondar, A, Bozek, A, Bračko, M, Brodzicka, J, Browder, TE, Chang, P, Chen, A, Cheon, BG, Chiang, CC, Chistov, R, Cho, IS, Choi, SK, Choi, Y, Dalseno, J, Danilov, M, Dash, M, Eidelman, S, Gabyshev, N, Ha, H, Haba, J, Hayasaka, K, Hazumi, M, Heffernan, D, Hoshi, Y, Hou, WS, Hsiung, YB, Hyun, HJ, Iijima, T, Inami, K, Ishikawa, A, Ishino, H, Itoh, R, Iwasaki, M, Iwasaki, Y, Kah, DH, Kang, JH, Katayama, N, Kawai, H, Kawasaki, T, Kichimi, H, Kim, HJ, Kim, HO, Kim, SK, Kim, YI, Kim, YJ, Kinoshita, K, Križan, P, Krokovny, P, Kumar, R, Kuzmin, A, Kwon, YJ, Kyeong, SH, Lange, JS, Lee, JS, Lee, SE, Lesiak, T, Li, J, Limosani, A, Liu, C, Liventsev, D, Mandl, F, Matyja, A, Miyabayashi, K, Miyata, H, Miyazaki, Y, Mizuk, R, Mori, T, Nakano, E, Nakao, M, Natkaniec, Z, Nishida, S, Nitoh, O, Noguchi, S, Ogawa, S, Ohshima, T, Okuno, S, Olsen, SL, Ozaki, H, Pakhlov, P, Palka, H, Park, CW, Park, H, Park, HK, Peak, LS, Piilonen, LE, Poluektov, A, Sahoo, H, Sakai, Y, Schneider, O, Senyo, K, Shapkin, M, Shen, CP, Shiu, JG, Shwartz, B, Singh, JB, Sokolov, A, Stanič, S, Starič, M, Sumiyoshi, T, Tanaka, M, Taylor, GN, Teramoto, Y, Tikhomirov, I, Uehara, S, Uglov, T, Unno, Y, Uno, S, Urquijo, P, Usov, Y, Varner, G, Wang, CH, Wang, MZ, Wang, P, Wang, XL, Watanabe, Y, Wedd, R, Won, E, Yabsley, BD, Yamashita, Y, Yamauchi, M, Yuan, CZ, Zhang, CC, Zhang, ZP, Zhilich, V, Zhulanov, V, Zivko, T, Zupanc, A & Zyukova, O 2008, 'Observation of a near-threshold enhancement in the e+e- →Λc+Λc- Cross section using initial-state radiation', Physical Review Letters, vol. 101, no. 17, 172001. https://doi.org/10.1103/PhysRevLett.101.172001

TY - JOUR

T1 - Observation of a near-threshold enhancement in the e+e- →Λc+Λc- Cross section using initial-state radiation

AU - Pakhlova, G.

AU - Adachi, I.

AU - Aihara, H.

AU - Arinstein, K.

AU - Aulchenko, V.

AU - Aushev, T.

AU - Bakich, A. M.

AU - Balagura, V.

AU - Bedny, I.

AU - Bhardwaj, V.

AU - Bitenc, U.

AU - Bondar, A.

AU - Bozek, A.

AU - Bračko, M.

AU - Brodzicka, J.

AU - Browder, T. E.

AU - Chang, P.

AU - Chen, A.

AU - Cheon, B. G.

AU - Chiang, C. C.

AU - Chistov, R.

AU - Cho, I. S.

AU - Choi, S. K.

AU - Choi, Y.

AU - Dalseno, J.

AU - Danilov, M.

AU - Dash, M.

AU - Eidelman, S.

AU - Gabyshev, N.

AU - Ha, H.

AU - Haba, J.

AU - Hayasaka, K.

AU - Hazumi, M.

AU - Heffernan, D.

AU - Hoshi, Y.

AU - Hou, W. S.

AU - Hsiung, Y. B.

AU - Hyun, H. J.

AU - Iijima, T.

AU - Inami, K.

AU - Ishikawa, A.

AU - Ishino, H.

AU - Itoh, R.

AU - Iwasaki, M.

AU - Iwasaki, Y.

AU - Kah, D. H.

AU - Kang, J. H.

AU - Katayama, N.

AU - Kawai, H.

AU - Kawasaki, T.

AU - Kichimi, H.

AU - Kim, H. J.

AU - Kim, H. O.

AU - Kim, S. K.

AU - Kim, Y. I.

AU - Kim, Y. J.

AU - Kinoshita, K.

AU - Križan, P.

AU - Krokovny, P.

AU - Kumar, R.

AU - Kuzmin, A.

AU - Kwon, Y. J.

AU - Kyeong, S. H.

AU - Lange, J. S.

AU - Lee, J. S.

AU - Lee, S. E.

AU - Lesiak, T.

AU - Li, J.

AU - Limosani, A.

AU - Liu, C.

AU - Liventsev, D.

AU - Mandl, F.

AU - Matyja, A.

AU - Miyabayashi, K.

AU - Miyata, H.

AU - Miyazaki, Y.

AU - Mizuk, R.

AU - Mori, T.

AU - Nakano, E.

AU - Nakao, M.

AU - Natkaniec, Z.

AU - Nishida, S.

AU - Nitoh, O.

AU - Noguchi, S.

AU - Ogawa, S.

AU - Ohshima, T.

AU - Okuno, S.

AU - Olsen, S. L.

AU - Ozaki, H.

AU - Pakhlov, P.

AU - Palka, H.

AU - Park, C. W.

AU - Park, H.

AU - Park, H. K.

AU - Peak, L. S.

AU - Piilonen, L. E.

AU - Poluektov, A.

AU - Sahoo, H.

AU - Sakai, Y.

AU - Schneider, O.

AU - Senyo, K.

AU - Shapkin, M.

AU - Shen, C. P.

AU - Shiu, J. G.

AU - Shwartz, B.

AU - Singh, J. B.

AU - Sokolov, A.

AU - Stanič, S.

AU - Starič, M.

AU - Sumiyoshi, T.

AU - Tanaka, M.

AU - Taylor, G. N.

AU - Teramoto, Y.

AU - Tikhomirov, I.

AU - Uehara, S.

AU - Uglov, T.

AU - Unno, Y.

AU - Uno, S.

AU - Urquijo, P.

AU - Usov, Y.

AU - Varner, G.

AU - Wang, C. H.

AU - Wang, M. Z.

AU - Wang, P.

AU - Wang, X. L.

AU - Watanabe, Y.

AU - Wedd, R.

AU - Won, E.

AU - Yabsley, B. D.

AU - Yamashita, Y.

AU - Yamauchi, M.

AU - Yuan, C. Z.

AU - Zhang, C. C.

AU - Zhang, Z. P.

AU - Zhilich, V.

AU - Zhulanov, V.

AU - Zivko, T.

AU - Zupanc, A.

AU - Zyukova, O.

PY - 2008/10/24

Y1 - 2008/10/24

N2 - We report a measurement of the exclusive e+e-→Λc+Λc- cross section as a function of center-of-mass energy near the Λc+Λc- threshold. A clear peak with a significance of 8.2σ is observed in the Λc+Λc- invariant mass distribution just above threshold. With an assumption of a resonance origin for the observed peak, a mass and width of M=[4634-7+8(stat)-8+5(syst)]MeV/c2 and Γtot=[92- 24+40(stat)-21+10(syst)]MeV are determined. The analysis is based on a study of events with initial-state-radiation photons in a data sample collected with the Belle detector at the Υ(4S) resonance and nearby continuum with an integrated luminosity of 695fb-1 at the KEKB asymmetric-energy e+e- collider.

AB - We report a measurement of the exclusive e+e-→Λc+Λc- cross section as a function of center-of-mass energy near the Λc+Λc- threshold. A clear peak with a significance of 8.2σ is observed in the Λc+Λc- invariant mass distribution just above threshold. With an assumption of a resonance origin for the observed peak, a mass and width of M=[4634-7+8(stat)-8+5(syst)]MeV/c2 and Γtot=[92- 24+40(stat)-21+10(syst)]MeV are determined. The analysis is based on a study of events with initial-state-radiation photons in a data sample collected with the Belle detector at the Υ(4S) resonance and nearby continuum with an integrated luminosity of 695fb-1 at the KEKB asymmetric-energy e+e- collider.

UR - http://www.scopus.com/inward/record.url?scp=55149107430&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.101.172001

DO - 10.1103/PhysRevLett.101.172001

M3 - Article

AN - SCOPUS:55149107430

SN - 0031-9007

VL - 101

JO - Physical Review Letters

JF - Physical Review Letters

IS - 17

M1 - 172001

ER -

Observation of a near-threshold enhancement in the e+e- →Λc+Λc- Cross section using initial-state radiation

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