Observation of a near-threshold enhancement in the e+e- →Λc+Λc- Cross section using initial-state radiation
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.; Chiang, C.-C.; Chistov, R.; Cho, I.-S.; Choi, S.-K.; 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, W.-S.; Hsiung, Y.B.; Hyun, H.J.; Iijima, T.; Inami, K.; Ishikawa, A.; Ishino, H.; Itoh, R.; Iwasaki, M.; Iwasaki, Y.; Kah, D.H.; Kang, J.H.; Katayama, N.; Kawai, H.; Kawasaki, T.; Kichimi, H.; Kim, H.J.; Kim, H.O.; Kim, S.K.; Kim, Y.I.; Kim, Y.J.; Kinoshita, K.; Križan, P.; Krokovny, P.; Kumar, R.; Kuzmin, A.; Kwon, Y.-J.; Kyeong, S.-H.; Lange, J.S.; Lee, J.S.; Lee, S.E.; 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, S.L.; Ozaki, H.; Pakhlov, P.; Palka, H.; Park, C.W.; Park, H.; Park, H.K.; Peak, L.S.; Piilonen, L.E.; Poluektov, A.; Sahoo, H.; Sakai, Y.; Schneider, O.; Senyo, K.; Shapkin, M.; Shen, C.P.; Shiu, J.-G.; Shwartz, B.; Singh, J.B.; Sokolov, A.; Stanič, S.; Starič, M.; Sumiyoshi, T.; Tanaka, M.; Taylor, G.N.; Teramoto, Y.; Tikhomirov, I.; Uehara, S.; Uglov, T.; Unno, Y.; Uno, S.; Urquijo, P.; Usov, Y.; Varner, G.; Wang, C.H.; Wang, M.-Z.; Wang, P.; Wang, X.L.; Watanabe, Y.; Wedd, R.; Won, E.; Yabsley, B.D.; Yamashita, Y.; Yamauchi, M.; Yuan, C.Z.; Zhang, C.C.; Zhang, Z.P.; Zhilich, V.; Zhulanov, V.; Zivko, T.; Zupanc, A.; Zyukova, O.
2008
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. © 2008 The American Physical Society.
Details
Title
Observation of a near-threshold enhancement in the e+e- →Λc+Λc- Cross section using initial-state radiation
Author(s)
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. ; Chiang, C.-C. ; Chistov, R. ; Cho, I.-S. ; Choi, S.-K. ; 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, W.-S. ; Hsiung, Y.B. ; Hyun, H.J. ; Iijima, T. ; Inami, K. ; Ishikawa, A. ; Ishino, H. ; Itoh, R. ; Iwasaki, M. ; Iwasaki, Y. ; Kah, D.H. ; Kang, J.H. ; Katayama, N. ; Kawai, H. ; Kawasaki, T. ; Kichimi, H. ; Kim, H.J. ; Kim, H.O. ; Kim, S.K. ; Kim, Y.I. ; Kim, Y.J. ; Kinoshita, K. ; Križan, P. ; Krokovny, P. ; Kumar, R. ; Kuzmin, A. ; Kwon, Y.-J. ; Kyeong, S.-H. ; Lange, J.S. ; Lee, J.S. ; Lee, S.E. ; 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, S.L. ; Ozaki, H. ; Pakhlov, P. ; Palka, H. ; Park, C.W. ; Park, H. ; Park, H.K. ; Peak, L.S. ; Piilonen, L.E. ; Poluektov, A. ; Sahoo, H. ; Sakai, Y. ; Schneider, O. ; Senyo, K. ; Shapkin, M. ; Shen, C.P. ; Shiu, J.-G. ; Shwartz, B. ; Singh, J.B. ; Sokolov, A. ; Stanič, S. ; Starič, M. ; Sumiyoshi, T. ; Tanaka, M. ; Taylor, G.N. ; Teramoto, Y. ; Tikhomirov, I. ; Uehara, S. ; Uglov, T. ; Unno, Y. ; Uno, S. ; Urquijo, P. ; Usov, Y. ; Varner, G. ; Wang, C.H. ; Wang, M.-Z. ; Wang, P. ; Wang, X.L. ; Watanabe, Y. ; Wedd, R. ; Won, E. ; Yabsley, B.D. ; Yamashita, Y. ; Yamauchi, M. ; Yuan, C.Z. ; Zhang, C.C. ; Zhang, Z.P. ; Zhilich, V. ; Zhulanov, V. ; Zivko, T. ; Zupanc, A. ; Zyukova, O.
Published in
Physical Review Letters
Volume
101
Issue
17
Pages
172001
Date
2008
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Laboratories
LPHE
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Scientific production and competences > SB - School of Basic Sciences > IPHYS - Institute of Physics > LPHE - High Energy Physics Laboratory
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Work produced at EPFL
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Peer-reviewed publications
Work produced at EPFL
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Record creation date
2010-11-05