Observation of the χc2(2P) meson in the reaction γγ→ DD̄ at BABAR

BABAR Collaboration

Research output: Contribution to journalArticle

Abstract

A search for the Z(3930) resonance in γγ production of the DD̄ 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 DD̄ 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)→DD̄) is found to be (0.24±0.05±0.04)keV.

Original languageEnglish (US)
Article number092003
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume81
Issue number9
DOIs
StatePublished - May 19 2010

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parity
mesons
mass distribution
positrons
luminosity
tensors
electron energy
decay

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Observation of the χc2(2P) meson in the reaction γγ→ DD̄ at BABAR. / BABAR Collaboration.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 81, No. 9, 092003, 19.05.2010.

Research output: Contribution to journalArticle

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title = "Observation of the χc2(2P) meson in the reaction γγ→ DD̄ at BABAR",
abstract = "A search for the Z(3930) resonance in γγ production of the DD̄ 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 DD̄ 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)→DD̄) 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 D. Kirkby",
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AU - BABAR Collaboration

AU - Aubert, B.

AU - Karyotakis, Y.

AU - Lees, J. P.

AU - Poireau, V.

AU - Prencipe, E.

AU - Prudent, X.

AU - Tisserand, V.

AU - Garra Tico, J.

AU - Grauges, E.

AU - Martinelli, M.

AU - Palano, A.

AU - Pappagallo, M.

AU - Eigen, G.

AU - Stugu, B.

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AU - Brown, D. N.

AU - Hooberman, B.

AU - Kerth, L. T.

AU - Kolomensky, Yu G.

AU - Lynch, G.

AU - Osipenkov, I. L.

AU - Tackmann, K.

AU - Tanabe, T.

AU - Hawkes, C. M.

AU - Soni, N.

AU - Watson, A. T.

AU - Koch, H.

AU - Schroeder, T.

AU - Asgeirsson, D. J.

AU - Hearty, C.

AU - Mattison, T. S.

AU - McKenna, J. A.

AU - Barrett, M.

AU - Khan, A.

AU - Randle-Conde, A.

AU - Blinov, V. E.

AU - Bukin, A. D.

AU - Buzykaev, A. R.

AU - Druzhinin, V. P.

AU - Golubev, V. B.

AU - Onuchin, A. P.

AU - Serednyakov, S. I.

AU - Skovpen, Yu I.

AU - Solodov, E. P.

AU - Todyshev, K. Yu

AU - Bondioli, M.

AU - Curry, S.

AU - Eschrich, I.

AU - Kirkby, D.

PY - 2010/5/19

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N2 - A search for the Z(3930) resonance in γγ production of the DD̄ 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 DD̄ 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)→DD̄) is found to be (0.24±0.05±0.04)keV.

AB - A search for the Z(3930) resonance in γγ production of the DD̄ 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 DD̄ 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)→DD̄) is found to be (0.24±0.05±0.04)keV.

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