TY - JOUR

T1 - Search for ηc(2S)→2(π+π−) and improved measurement of χcJ→2(π+π−)

AU - BESIII Collaboration

AU - Ablikim, M.

AU - Achasov, M. n.

AU - Николаев, Иван Борисович

AU - Мучной, Николай Юрьевич

PY - 2024/10/15

Y1 - 2024/10/15

N2 - We search for the hadronic decay ηc(2S)→2(π+π-) in the ψ(3686)→γηc(2S) radiative decay using (27.12±0.14)×108 ψ(3686) events collected by the BESIII detector at the BEPCII collider. No significant signal is found, and the upper limit of B[ψ(3686)→γηc(2S)]B[ηc(2S)→2(π+π-)] is determined to be 1.43×10-6 at the 90% confidence level. Using ψ(3686)→γχcJ transitions, we also measure the branching fractions of B[χcJ(J=0,1,2)→2(π+π-)], which are B[χc0→2(π+π-)]=(2.127±0.002(stat)±0.101(syst))%, B[χc1→2(π+π-)]=(0.685±0.001(stat)±0.031(syst))%, and B[χc2→2(π+π-)]=(1.153±0.001(stat)±0.063(syst))%.

AB - We search for the hadronic decay ηc(2S)→2(π+π-) in the ψ(3686)→γηc(2S) radiative decay using (27.12±0.14)×108 ψ(3686) events collected by the BESIII detector at the BEPCII collider. No significant signal is found, and the upper limit of B[ψ(3686)→γηc(2S)]B[ηc(2S)→2(π+π-)] is determined to be 1.43×10-6 at the 90% confidence level. Using ψ(3686)→γχcJ transitions, we also measure the branching fractions of B[χcJ(J=0,1,2)→2(π+π-)], which are B[χc0→2(π+π-)]=(2.127±0.002(stat)±0.101(syst))%, B[χc1→2(π+π-)]=(0.685±0.001(stat)±0.031(syst))%, and B[χc2→2(π+π-)]=(1.153±0.001(stat)±0.063(syst))%.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85207123305&origin=inward&txGid=576a0686963c5b249cd192f31c97bc69

U2 - 10.1103/PhysRevD.110.072009

DO - 10.1103/PhysRevD.110.072009

M3 - Article

VL - 110

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 7

M1 - 072009

ER -