@article{b1b016c361b04e2a96efbf0a7c73ae5d,

title = "Observation of the χc2(2P) meson in the reaction γγ→ D{\=D} at BABAR",

abstract = "A search for the Z(3930) resonance in γγ production of the D{\=D} system has been performed using a data sample corresponding to an integrated luminosity of 384fb-1 recorded by the BABAR experiment at the PEP-II asymmetric-energy electron-positron collider. The D{\=D} invariant mass distribution shows clear evidence of the Z(3930) state with a significance of 5.8σ. We determine mass and width values of (3926.7±2. 7±1.1)MeV/c2 and (21.3±6.8±3.6)MeV, respectively. A decay angular analysis provides evidence that the Z(3930) is a tensor state with positive parity and C parity (JPC=2++); therefore we identify the Z(3930) state as the χc2(2P) meson. The value of the partial width Γγγ×B(Z(3930)→D{\=D}) is found to be (0.24±0.05±0.04)keV.",

author = "{BABAR Collaboration} and B. Aubert and Y. Karyotakis and Lees, {J. P.} and V. Poireau and E. Prencipe and X. Prudent and V. Tisserand and {Garra Tico}, J. and E. Grauges and M. Martinelli and A. Palano and M. Pappagallo and G. Eigen and B. Stugu and L. Sun and M. Battaglia and Brown, {D. N.} and B. Hooberman and Kerth, {L. T.} and Kolomensky, {Yu G.} and G. Lynch and Osipenkov, {I. L.} and K. Tackmann and T. Tanabe and Hawkes, {C. M.} and N. Soni and Watson, {A. T.} and H. Koch and T. Schroeder and Asgeirsson, {D. J.} and C. Hearty and Mattison, {T. S.} and McKenna, {J. A.} and M. Barrett and A. Khan and A. Randle-Conde and Blinov, {V. E.} and Bukin, {A. D.} and Buzykaev, {A. R.} and Druzhinin, {V. P.} and Golubev, {V. B.} and Onuchin, {A. P.} and Serednyakov, {S. I.} and Skovpen, {Yu I.} and Solodov, {E. P.} and Todyshev, {K. Yu} and M. Bondioli and S. Curry and I. Eschrich and A. Soffer",

year = "2010",

month = may,

day = "19",

doi = "10.1103/PhysRevD.81.092003",

language = "אנגלית",

volume = "81",

journal = "Physical Review D - Particles, Fields, Gravitation and Cosmology",

issn = "1550-7998",

publisher = "American Physical Society",

number = "9",

}