Abstract
To investigate the nature of the (3770) resonance and to measure the cross section for , a cross-section scan data sample, distributed among 41 center-of-mass energy points from 3.73 to 3.89 GeV, was taken with the BESIII detector operated at the BEPCII collider in the year 2010. By analyzing the large angle Bhabha scattering events, we measure the integrated luminosity of the data sample at each center-of-mass energy point. The total integrated luminosity of the data sample is , where the first uncertainty is statistical and the second systematic.
Highlights
The ψ(3770) is the lowest mass charmonium state above the DDthreshold, and is generally regarded as the 13D1 dominant charmonium state [1]
We present measurements of the integrated luminosity of the ψ(3770) cross-section scan data at each Ecm by analyzing large angle Bhabha scattering events
Inserting the numbers of observed Bhabha scattering events, the contamination rates of backgrounds, the detection efficiencies and cross sections calculated with the Babayaga v3.5 generator [10] into Eq (1), we obtain the integrated luminosity at individual CM energy points for the ψ(3770) cross-section scan data
Summary
The ψ(3770) is the lowest mass charmonium state above the DDthreshold, and is generally regarded as the 13D1 dominant charmonium state [1]. To investigate the nature of the ψ(3770) resonance, the BESIII Collaboration performed a cross-section scan experiment, in which e+e− data at 41 center-of-mass (CM) energy (Ecm) points from 3.73 to 3.89 GeV were collected. This data sample, referred to as the “ψ(3770) cross-section scan data,” was collected during the time period from June 1st to June 16th, 2010. The ψ(3770) cross-section scan data can be used to study the line-shapes of the cross sections for various hadronic final states produced in e+e− annihilation in the energy region around the ψ(3770) Amplitude analyses of these line-shapes of cross sections will provide crucial information to explore the anomalous line-shape observed by the BESII experiment in 2008 [2]. The luminosities are checked with an independent measurement by analyzing e+e− →(γ)γγ events
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