Observation of a narrow resonance at 9.46 GeV in electron - positron annihilations

1978 ◽  
Vol 76 (2) ◽  
pp. 246-248 ◽  
Author(s):  
C.W. Darden ◽  
H. Hasemann ◽  
A. Krolzig ◽  
W. Schmidt-Parzefall ◽  
H. Schröder ◽  
...  
Keyword(s):  
Narrow Resonance ◽  
Electron Positron

Evidence for a narrow resonance at 10.01 GeV in electron-positron annihilations

1978 ◽  
Vol 78 (2-3) ◽  
pp. 364-365 ◽  
Author(s):  
C.W. Darden ◽  
H. Hasemann ◽  
A. Krolzig ◽  
W. Schmidt-Parzefall ◽  
H. Schröder ◽  
...  
Keyword(s):  
Narrow Resonance ◽  
Electron Positron

Major Upgrade of the Beijing Electron-Positron Collider

2009 ◽  
Vol 2009 (3) ◽  
pp. 275-281 ◽  
Author(s):  
Hesheng Chen ◽  
Chuang Zhang ◽  
Weiguo Li
Keyword(s):  
Electron Positron

scholarly journals Search for the rare semi-leptonic decay J/ψ → D−e+νe + c.c.

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
◽  
M. Ablikim ◽  
M. N. Achasov ◽  
P. Adlarson ◽  
S. Ahmed ◽  
...  
Keyword(s):  
Confidence Level ◽  
Branching Fraction ◽  
Center Of Mass ◽  
Leptonic Decay ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Upper Limit ◽  
Electron Positron

Abstract Using 10.1 × 109J/ψ events produced by the Beijing Electron Positron Collider (BEPCII) at a center-of-mass energy $$ \sqrt{s} $$ s = 3.097 GeV and collected with the BESIII detector, we present a search for the rare semi-leptonic decay J/ψ → D−e+νe + c.c. No excess of signal above background is observed, and an upper limit on the branching fraction ℬ(J/ψ → D−e+νe + c. c.) < 7.1 × 10−8 is obtained at 90% confidence level. This is an improvement of more than two orders of magnitude over the previous best limit.

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