Precision Measurement of the Cross Section Near Threshold
Journal Article
·
· Physical Review Letters
The cross section of the e+e- → $$Λ_c^+$$$$\bar{Λ}$$$$_c^-$$ 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 non-zero cross section near the $$Λ_c^+$$$$\bar{Λ}$$$$_c^-$$ 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.
- Research Organization:
- George Washington Univ., Washington, DC (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- Contributing Organization:
- BESIII Collaboration
- Grant/Contract Number:
- FG02-05ER41374; SC-0010118; SC-0010504; SC-0012069; SC0016583
- OSTI ID:
- 1430403
- Alternate ID(s):
- OSTI ID: 1440844
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Vol. 120 Journal Issue: 13; ISSN 0031-9007
- Publisher:
- American Physical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Cited by: 40 works
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