Measurement of the e⁺e^-→ΛΛ cross section from threshold to 3.00 GeV using events with initial-state radiation

2023/03/14 by BESIII Collaboration, Ablikim, M., Achasov, M. N. +600
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2303.07629

Abstract

Using initial-state radiation events from a total integrated luminosity of 11.957 fb^-1 of e⁺e^- collision data collected at center-of-mass energies between 3.773 and 4.258 GeV with the BESIII detector at BEPCII, the cross section for the process e⁺e^-→ΛΛ is measured in 16 ΛΛ invariant mass intervals from the production threshold up to 3.00 GeV/c². The results are consistent with previous results from BaBar and BESIII, but with better precision and with narrower ΛΛ invariant mass intervals than BaBar.

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