TY - JOUR
T1 - Precision Measurement of the e+e−→Λc+¯Λc− Cross Section Near Threshold
AU - BESIII Collaboration
AU - Ablikim, M.
AU - Achasov, M. N.
AU - Ahmed, S.
AU - Albrecht, M.
AU - Alekseev, M.
AU - Amoroso, A.
AU - Haddadi, Zahra
AU - Kalantar-Nayestanaki, Nasser
AU - Kavatsyuk, Myroslav
AU - Messchendorp, Johannes
AU - Tiemens, Marcel
PY - 2018/3/29
Y1 - 2018/3/29
N2 - The cross section of the e+e−→Λ+c¯Λ−c process is measured with unprecedented precision using data collected with the BESIII detector at √s=4574.5, 4580.0, 4590.0 and 4599.5 MeV. The nonzero cross section near the Λ+c¯Λ−c production threshold is cleared. At center-of-mass energies √s=4574.5 and 4599.5 MeV, the higher statistics data enable us to measure the Λc polar angle distributions. From these, the Λc electric over magnetic form-factor ratios (|GE/GM|) are measured for the first time. They are found to be 1.14±0.14±0.07 and 1.23±0.05±0.03, respectively, where the first uncertainties are statistical and the second are systematic.
AB - The cross section of the e+e−→Λ+c¯Λ−c process is measured with unprecedented precision using data collected with the BESIII detector at √s=4574.5, 4580.0, 4590.0 and 4599.5 MeV. The nonzero cross section near the Λ+c¯Λ−c production threshold is cleared. At center-of-mass energies √s=4574.5 and 4599.5 MeV, the higher statistics data enable us to measure the Λc polar angle distributions. From these, the Λc electric over magnetic form-factor ratios (|GE/GM|) are measured for the first time. They are found to be 1.14±0.14±0.07 and 1.23±0.05±0.03, respectively, where the first uncertainties are statistical and the second are systematic.
U2 - 10.1103/PhysRevLett.120.132001
DO - 10.1103/PhysRevLett.120.132001
M3 - Article
SN - 0031-9007
VL - 120
JO - Physical Review Letters
JF - Physical Review Letters
IS - 13
M1 - 132001
ER -