New Hadrons Newly observed D(2550), D(2610), and D(2760) as 2S and 1D charmed mesons “the same title”, Phys. Rev. D82 (2010) Observation of New Resonances Decaying to Dπ and D*π, ICHEP2010, Paris July 23, (2010) by Jose Benitez (SLAC) Observation of new resonances decaying to Dπ and D * π in inclusive e + e - collisions near √s=10.58 GeV, by P. Amo Sanchez et al., Phys. Rev. D82, (2010) Zhi-Feng Sun, Jie-Sheng Yu, Xiang Liu (Lanzhou Univ.) Takayuki Matsuki (Tokyo Kasei Univ.) Based on T. Matsuki 11/02/281

New Hadrons2 D(2550), D(2610), and D(2760) BaBar observed three new excited D mesons, D(2550), D(2610) and D(2760) –These are analyzed by experimentalists: D(2550) 0 and D*(2610) 0 as –D(2760) as L=2 state (L= internal angular momentum) : there are three L=2 states but not identified to be one We calculate the decay widths (also referring to the mass predictions) –D(2550) as but with much narrower decay width compared with the experiment –D(2610) as an admixture of –D(2760) as either an orthogonal partner of D(2610) or Competition with Xian-Hui Zhong (arXiv: /PhysRevD ); also with Zhi-Gang Wang (arXiv: /PhysRevD )

BaBar Experiment T. Matsuki 11/02/28New Hadrons3

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T. Matsuki 11/02/28New Hadrons11 Observation:D(2610),D(2760) Sanchez et al., PRD D82, (2010)

T. Matsuki 11/02/28New Hadrons12 Observation:D(2550) total Sanchez et al., PRD D82, (2010)

T. Matsuki 11/02/28New Hadrons13 Summary of experiments

Spectroscopy QCD potential model predictions Observations of higher states have been hindered by poor statistics T. Matsuki 11/02/28New Hadrons14 Belle FOCUS (omitted from Summary Table)

Admixture of 1 - states D(2610) may be an admixture of D(2760) could be a cousin of this mixture Suggested by explanation due to Rosner (PRD64, (2001)) T. Matsuki 11/02/28New Hadrons15

Decay Channels T. Matsuki 11/02/28New Hadrons16

Allowed Decay Channels Use the QPC model for all the (OZI-allowed) channels below thresholds (taking into account phase space also) T. Matsuki 11/02/28New Hadrons17

T. Matsuki 11/02/28New Hadrons18 Summary of experiments

Width for D(2550) Far below the observed value – assumption ? – QPC model ? – assignment ? –Statistics ? T. Matsuki 11/02/28New Hadrons19

Widths for D(2610) and D(2760) Pure states are excluded Consistent with experiment with the mixing angle radian T. Matsuki 11/02/28New Hadrons20

T. Matsuki 11/02/28New Hadrons21 D(2760) and D-waves Too narrow –Experimental value = 60.9 MeV

Width for D(2 - ): prediction Far below the observed value – assumption ? T. Matsuki 11/02/28New Hadrons22

T. Matsuki 11/02/28New Hadrons23 Summary BaBar observed three new excited D mesons, D(2550), D(2610) and D(2760) –These are analyzed by experimentalists: D(2550) 0 and D*(2610) 0 as –D(2760) as L=2 state (L= internal angular momentum) : there are three L=2 states but not identified to be one We have calculated the decay widths (also referring to the mass predictions) –D(2550) as but with much narrower decay width compared with the experiment –D(2610) as an admixture of –D(2760) as either an orthogonal partner of D(2610) or