Observation of the χ_{c2}(2P) meson in the reaction γγ→DD[over ¯] at BABAR

B. Aubert,Y. Karyotakis,J. P. Lees,V. Poireau,E. Prencipe,X. Prudent,V. Tisserand,J. Garra Tico,E. Grauges,M. Martinelli,A. Palano,M. Pappagallo,G. Eigen,B. Stugu,L. Sun,M. Battaglia,D. N. Brown,B. Hooberman,L. T. Kerth,Yu. G. Kolomensky,G. Lynch,I. L. Osipenkov,K. Tackmann,T. Tanabe,C. M. Hawkes,N. Soni,A. T. Watson,H. Koch,T. Schroeder,D. J. Asgeirsson,C. Hearty,T. S. Mattison,J. A. McKenna,M. Barrett, A. Khan,A. Randle-Conde,V. E. Blinov,A. D. Bukin,A. R. Buzykaev,V. P. Druzhinin,V. B. Golubev,A. P. Onuchin,S. I. Serednyakov,Yu. I. Skovpen,E. P. Solodov,K. Yu. Todyshev,M. Bondioli,S. Curry,I. Eschrich,D. Kirkby,A. J. Lankford,P. Lund,M. Mandelkern,E. C. Martin,D. P. Stoker, H. Atmacan,J. W. Gary,F. Liu,O. Long,G. M. Vitug,Z. Yasin,V. Sharma,C. Campagnari,T. M. Hong,D. Kovalskyi,M. A. Mazur,J. D. Richman,T. W. Beck,A. M. Eisner,C. A. Heusch,J. Kroseberg,W. S. Lockman,A. J. Martinez,T. Schalk,B. A. Schumm,A. Seiden, L. O. Winstrom,C. H. Cheng,D. A. Doll,B. Echenard,F. Fang,D. G. Hitlin,I. Narsky,P. Ongmongkolkul,T. Piatenko,F. C. Porter,R. Andreassen,M. S. Dubrovin,G. Mancinelli,B. T. Meadows,K. Mishra,M. D. Sokoloff,P. C. Bloom,W. T. Ford,A. Gaz,J. F. Hirschauer,M. Nagel,U. Nauenberg,J. G. Smith, S. R. Wagner,R. Ayad,W. H. Toki,E. Feltresi,A. Hauke,H. Jasper,T. M. Karbach,J. Merkel,A. Petzold,B. Spaan,K. Wacker,M. J. Kobel,K. R. Schubert,R. Schwierz,D. Bernard,E. Latour,M. Verderi,P. J. Clark,S. Playfer,J. E. Watson,M. Andreotti,D. Bettoni,C. Bozzi,R. Calabrese,A. Cecchi,G. Cibinetto,E. Fioravanti,P. Franchini,E. Luppi,M. Munerato,M. Negrini,A. Petrella,L. Piemontese,V. Santoro,R. Baldini-Ferroli,A. Calcaterra,R. de Sangro,G. Finocchiaro,S. Pacetti,P. Patteri,I. M. Peruzzi,M. Piccolo,M. Rama,A. Zallo,R. Contri,E. Guido,M. Lo Vetere,M. R. Monge,S. Passaggio,C. Patrignani,E. Robutti,S. Tosi,M. Morii,A. Adametz,J. Marks,S. Schenk,U. Uwer,F. U. Bernlochner,H. M. Lacker,T. Lueck,A. Volk,P. D. Dauncey,M. Tibbetts,P. K. Behera,M. J. Charles,U. Mallik,C. Chen,J. 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PHYSICAL REVIEW D（2010）

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摘要

A search for the Z(3930) resonance in gamma gamma production of the D (D) over bar system has been performed using a data sample corresponding to an integrated luminosity of 384 fb(-1) recorded by the BABAR experiment at the PEP-II asymmetric-energy electron-positron collider. The D (D) over bar invariant mass distribution shows clear evidence of the Z(3930) state with a significance of 5.8 sigma. We determine mass and width values of (3926.7 +/- 2.7 +/- 1.1) MeV/c(2) 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 (J(PC) = 2(++)); therefore we identify the Z(3930) state as the chi(c2)(2P) meson. The value of the partial width Gamma(gamma gamma) x B(Z(3930) -> D (D) over bar) is found to be (0.24 +/- 0.05 +/- 0.04) keV.

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