Measurement of e⁺e^-→ϕπ⁺π^- cross sections at center-of-mass energies from 2.00 to 3.08 GeV

2021/12/25 by BESIII Collaboration, Ablikim, M., Achasov, M. N. +600
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.2112.13219

Abstract

Using data corresponding to an integrated luminosity of 651~pb^-1 accumulated at 22 center-of-mass energies from 2.00 to 3.08 GeV by the BESIII experiment, the process e⁺e^-→ϕπ⁺π^- is studied. The cross sections for e⁺e^-→ϕπ⁺π^- are consistent with previous results, but with improved precision. To measure the mass and width of the structure observed in the cross section line shape, a combine fit is performed after enhancing the contribution from ϕf₀(980). The fit reveals a structure with the mass of M=2178±20±5~\rm MeV/c² and the width of \varGamma=140±36±16~\rm MeV, where the first uncertainties are statistical and the second ones are systematic.

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