6533b85ffe1ef96bd12c1dfc
RESEARCH PRODUCT
Evidence for the direct two-photon transition from ψ(3686) to J/ψ.
Ablikim MAchasov M NAmbrose D JAn F FAn QAn Z HBai J ZFerroli R BBan YBecker JBerger NBertani M BBian J MBoger EBondarenko OBoyko IRoy A. BriereBytev VCai XCalcaterra A CCao G FChang J FChelkov GChen GChen H SChen J CChen M LChen S JChen YChen Y BCheng H PChu Y PCronin-hennessy DDai H LDai J PDedovich DDeng Z YDenig ADenysenko IDestefanis MDing W MDing YDong L YDong M YDu S XFang JFang S SFava LFeldbauer FFeng C QFu C DFu J LGao YGeng CGoetzen KGong W XGradl WGreco MGu M HGu Y TGuan Y HGuo A QGuo L BGuo Y PHan Y LHao X QHarris F AHe K LHe MHe Z YHeld THeng Y KHou Z LHu H MHu J FHu THuang BHuang G MHuang J SHuang X THuang Y PHussain TJi C SJi QJi X BJi X LJia L KJiang L LJiang X SJiao J BJiao ZJin D PJin SJing F FKalantar-nayestanaki NKavatsyuk MKuehn WLai WLange J SLeung J K CLi C HLi ChengLi CuiLi D MLi FLi GLi H BLi J CLi KLi LeiLi N BLi Q JLi S LLi W DLi W GLi X LLi X NLi X QLi X RLi Z BLiang HLiang Y FLiang Y TLiao G RLiao X TLiu B JLiu B JLiu C LLiu C XLiu C YLiu F HLiu FangLiu FengLiu HLiu H BLiu H HLiu H MLiu H WLiu J PLiu KunLiu KaiLiu K YLiu P LLiu S BLiu XLiu X HLiu Y BLiu YLiu Z ALiu ZhiqiangLiu ZhiqingLoehner HLu G RLu H JLu J GLu Q WLu X RLu Y PLuo C LLuo M XLuo TLuo X LLv MMa C LMa F CMa H LMa Q MMa SMa TMa X YMa YMaas F EMaggiora MMalik Q AMao HMao Y JMao Z PMesschendorp J GMin JMin T JMitchell R EMo X HMorales Morales CMotzko CMuchnoi N YuNefedov YNicholson CNikolaev I BNing ZOlsen S LOuyang QPacetti S PPark J WPelizaeus MPeters KPing J LPing R GPoling RPrencipe EPun C S JQi MQian SQiao C FQin X SQin YQin Z HQiu J FRashid K HRong GRuan X DSarantsev ASchulze JShao MShen C PShen X YSheng H YShepherd M RSong X YSpataro SSpruck BSun D HSun G XSun J FSun S SSun X DSun Y JSun Y ZSun Z JSun Z TTang C JTang XThorndike E HTian H LToth DUlrich M UVarner G SWang BWang B QWang KWang L LWang L SWang MWang PWang P LWang QWang Q JWang S GWang X FWang X LWang Y DWang Y FWang Y QWang ZWang Z GWang Z YWei D HWeidenkaff PWen Q GWen S PWerner M WWiedner UWu L HWu NWu S XWu WWu ZXia L GXiao Z JXie Y GXiu Q LXu G FXu G MXu HXu Q JXu X PXu YXu Z RXue FXue ZYan LYan W BYan Y HYang H XYang TYang YYang Y XYe HYe MYe M HYu B XYu C XYu J SYu S PYuan C ZYuan W LYuan YZafar A AZallo A ZZeng YZhang B XZhang B YZhang C CZhang D HZhang H HZhang H YZhang JZhang J GZhang J QZhang J WZhang J YZhang J ZZhang LZhang S HZhang T RZhang X JZhang X YZhang YZhang Y HZhang Y SZhang Z PZhang Z YZhao GZhao H SZhao J WZhao K XZhao LeiZhao LingZhao M GZhao QZhao S JZhao T CZhao X HZhao Y BZhao Z GZhemchugov AZheng BZheng J PZheng Y HZheng Z PZhong BZhong JZhou LZhou X KZhou X RZhu CZhu KZhu K JZhu S HZhu X LZhu X WZhu Y MZhu Y SZhu Z AZhuang JZou B SZou J HZuo J Xsubject
PhysicsParticle physicsBranching fractionElectron–positron annihilationGeneral Physics and Astronomydescription
The two-photon transition ψ(3686)→γγJ/ψ is studied in a sample of 1.06×10(8) ψ(3686) decays collected by the BESIII detector. The branching fraction is measured to be (3.1±0.6(stat)(-1.0)(+0.8)(syst))×10(-4) using J/ψ→e(+)e(-) and J/ψ→μ(+)μ(-) decays, and its upper limit is estimated to be 4.5×10(-4) at the 90% confidence level. This work represents the first measurement of a two-photon transition among charmonium states. The orientation of the ψ(3686) decay plane and the J/ψ polarization in this decay are also studied. In addition, the product branching fractions of sequential E1 transitions ψ(3686)→γχ(cJ) and χ(cJ)→γJ/ψ(J=0,1,2) are reported.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-10-24 | Physical review letters |