000002040 001__ 2040
000002040 005__ 20200725142500.0
000002040 037__ $$aBELLE2-NOTE-PL-2020-017
000002040 041__ $$aeng
000002040 100__ $$aThe Belle II Collaboration
000002040 245__ $$aStudy of e+e−→J/ψ(→µ+µ−) via initial-state radiation at Belle II
000002040 260__ $$a$$c2020-07-25
000002040 300__ $$amult. p
000002040 520__ $$aWe study e+e−→J/ψ(→µ+µ−) via initial-state radiation (ISR) using a data sample of an integrated luminosity of 37.8 fb^-1 collected with the Belle II detector at the Υ(4S) resonance and nearby. The distributions which represent ISR characteristics between data and MC are consistent. The J/ψ signal yield in data is compatible with our expectation according to MC simulation. We also give the muon identification efficiency corrections as functions of momenta and polar angles of muons. This analysis helps to understand ISR performances at Belle II, and perform the follow-up analysis, i.e., e+e−→π+π−J/ψ.
000002040 8560_ $$fsen.jia@desy.de
000002040 8564_ $$uhttps://docs.belle2.org/record/2040/files/Study%20of%20e%2Be%E2%88%92%E2%86%92J%3A%CF%88%28%E2%86%92%C2%B5%2B%C2%B5%E2%88%92%29%20via%20initial-state%20radiation%20at%20Belle%20II.pdf