Abstract
The measurements of hadronic form factors of three modes using the data samples collected with the BESIII detector at BEPCII collider are presented. The cross section of e+e- → p p̅ at 12 energies from 2232.4 to 3671.0 MeV are measured, the electromagnetic form factor is deduced, and the ratio |GE/GM| is extracted by fitting the polar angle distribution. The preliminary results about the form factors of e+e- → ∧c+ ⊼c- will also be described. The cross section of e+e- → π+ π-between effective center-of-mass energy 600 and 900 MeV is measured by the ISR return method using the data set with the integrated luminosity of 2.93 fb-1 taken at ψ(3773) peak, the pion form factor is extracted.
Highlights
The standard model (SM) is the basic theory of elementary particles, its one of the main subjects is to explore the inner structure of hadrons
The results for σbare(e+e− → π+π−(γFSR)) measured with m√ethod I and II are consistent within errors
The result for |Fπ|2 which includes vacuum polarizations, but final state radiation effects are excluded, and the exactly the same fit formula and fit procedure are applied as described in Ref. [4]
Summary
The standard model (SM) is the basic theory of elementary particles, its one of the main subjects is to explore the inner structure of hadrons (mesons and baryons). Λ+c and Λ −c are the grounds of the lightest singly charmed baryons, the properties of the cross section of the process e+e− → Λ+c Λ −c and Λ±c decay branch fractions were known less, BESIII did some preliminary measurements using the newly collected data. The form factor of charmed baryon in the process e+e− → Λ+c Λ−c near its production threshold is of interested in theory, which leads to various models [14]. BESIII measured the form factor as well as the branching fractions of 12 hadronic decay modes and the semi-leptonic decay Λ+c → Λe+νe and Λ+c → Λμ+νμ at center-of-mass energy 4574.5, 4580.0, 4590.0 and 4599.5 MeV, the detailed description can be found in references [7]
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