Journal article

Production of new charmoniumlike states in e( )e(-)-> J/psi D-(*())(D)over-bar(()*()) at root s approximate to 10.6 GeV

P Pakhlov, I Adachi, H Aihara, K Arinstein, T Aushev, T Aziz, AM Bakich, V Balagura, E Barberio, I Bedny, K Belous, V Bhardwaj, U Bitenc, A Bondar, A Bozek, M Bracko, TE Browder, Y Chao, A Chen, K-F Chen Show all

Physical Review Letters | AMER PHYSICAL SOC | Published : 2008


We report a study of the processes e+e- -->J/psiD*D[over](*). In J/psiD*D[over]* we observe a significant enhancement in the D*D[over]* invariant mass spectrum, which we interpret as a new charmoniumlike state and denote X(4160). The X(4160) parameters are M=(4156(-20)+25+/-15) MeV/c2 and Gamma=(139(-61)+111+/-21) MeV. We also report a new measurement of the X(3940) mass and width: M=(3942(-6)+7+/-6) MeV/c2 and Gamma=(37(-15)+26+/-8) MeV. The analysis is based on a 693 fb(-1) data sample recorded near the Upsilon(4S) resonance by the Belle detector at the KEKB asymmetric-energy collider.