Cross section measurement of e+e- → KS0 KL0 at s =2.00-3.08 GeV

(BESIII Collaboration)

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The cross sections of the process e+e-→KS0KL0 are measured at fifteen center-of-mass energies s from 2.00 to 3.08 GeV with a total integrated luminosity of 582 pb-1 and using the BESIII detector at the Beijing Electron Positron Collider. The results are found to be consistent with those obtained by BABAR. A resonant structure around 2.2 GeV is observed, with a mass and width of 2273.7±5.7±19.3 MeV/c2 and 86±44±51 MeV, respectively, where the first uncertainties are statistical and the second ones are systematic. The product of its radiative width (Γe+e-) with its branching fraction to KS0KL0 (BrKS0KL0) is 0.9±0.6±0.7 eV.

Original languageEnglish (US)
Article number092014
JournalPhysical Review D
Issue number9
StatePublished - Nov 1 2021

Bibliographical note

Funding Information:
We appreciate Prof. Dianyong Chen from Southeast University (SEU) for the important discussions and suggestions. The BESIII Collaboration thanks the staff of BEPCII and the IHEP computing center and the supercomputing center of USTC for their strong support. This work is supported in part by National Key R&D Program of China under Contracts No. 2020YFA0406400, No. 2020YFA0406300, No. 2015CB856700; National Natural Science Foundation of China (NSFC) under Contracts No. 11625523, No. 11635010, No. 11735014, No. 11822506, No. 11835012, No. 11935015, No. 11935016, No. 11935018, No. 11961141012; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No. U1732263, No. U1832207 and No. U2032115; CAS Key Research Program of Frontier Sciences under Contracts No. QYZDJ-SSW-SLH003, No. QYZDJ-SSW-SLH040; 100 Talents Program of CAS; The Institute of Nuclear and Particle Physics (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; ERC under Contract No. 758462; German Research Foundation DFG under Contract No. 443159800. Collaborative Research Center CRC 1044, FOR 2359; Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Science and Technology fund; STFC (United Kingdom); The Knut and Alice Wallenberg Foundation (Sweden) under Contract No. 2016.0157; The Royal Society, UK under Contracts No. DH140054, No. DH160214; The Swedish Research Council; U.S. Department of Energy under Contracts No. DE-FG02-05ER41374, No. DE-SC-0012069. This paper is also supported by the NSFC under Contracts No. 11605074, No. 11335008, No. 12105276.

Publisher Copyright:
© 2021 authors. Published by the American Physical Society.


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