Observation of a Near-Threshold Enhancement in thee+e−→Λc+Λc−Cross Section Using Initial-State Radiation

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

doi:10.1103/physrevlett.101.172001

Observation of a Near-Threshold Enhancement in thee+e−→Λc+Λc−Cross Section Using Initial-State Radiation

G Pakhlova, K Miyabayashi + Show 135 more

Open Access

https://doi.org/10.1103/physrevlett.101.172001

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Journal: Physical Review Letters	Publication Date: Oct 24, 2008
Citations: 246

Affiliation: Nara Women's University, Sungkyunkwan University, Kyungpook National University, Budker Institute of Nuclear Physics, University of Sydney, Nagoya University, National United University, University of Cincinnati, Niigata University, Toho University, Tokyo University of Agriculture and Technology, Osaka City University, Polish Academy of Sciences, University of Giessen, Tohoku Gakuin University, University of Maribor, Virginia Tech, Korea University, École Polytechnique Fédérale de Lausanne, Tokyo Metropolitan University, Saga University, University of Ljubljana, Yonsei University, University of Science and Technology of China, Kanagawa University, Austrian Academy of Sciences, University of Melbourne, Chiba University, The University of Tokyo, Panjab University, Hanyang University, Osaka University, National Taiwan University, National Central University

#Nearby Continuum #Invariant Mass Distribution + Show 8 more

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Abstract

We report a measurement of the exclusive e+ e- -->Lambda+_(c)Lambda-_(c) cross section as a function of center-of-mass energy near the Lambda+_(c)Lambda-_(c) threshold. A clear peak with a significance of 8.2sigma is observed in the Lambda+_(c)Lambda-_(c) invariant mass distribution just above threshold. With an assumption of a resonance origin for the observed peak, a mass and width of M=[4634 (+8)_(-7)(stat)(+5)_(-8)(syst)] MeV/c(2) and Gamma_(tot)=[92 (+40)_(-24)(stat)(+10)_(-21)(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 Upsilon(4S) resonance and nearby continuum with an integrated luminosity of 695 fb(-1) at the KEKB asymmetric-energy e+ e- collider.

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