Light meson spectroscopy from Dalitz plot analyses of η c decays to η ′ K + K − , η ′ π + π − , and η π + π − produced in two-photon interactions

We study the processes γγ → ηc → η′K+K- , η′π+π- , and ηπ+π- using a data sample of 519 fb-1 recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e+e- collider at center-of-mass energies at and near the ϒ ( nS ) ( n=2 , 3, 4) resonances. This is the first observation of t...

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Veröffentlicht in:	Physical review. D 2021-10, Vol.104 (7), Article 072002
Hauptverfasser:	Lees, J. P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., Brown, D. N., Kolomensky, Yu. G., Fritsch, M., Koch, H., Schroeder, T., Cheaib, R., Hearty, C., Mattison, T. S., McKenna, J. A., So, R. Y., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., Golubev, V. B., Kozyrev, E. A., Kravchenko, E. A., Onuchin, A. P., Serednyakov, S. I., Skovpen, Yu. I., Solodov, E. P., Todyshev, K. Yu, Lankford, A. J., Dey, B., Gary, J. W., Long, O., Eisner, A. M., Lockman, W. S., Panduro Vazquez, W., Chao, D. S., Cheng, C. H., Echenard, B., Flood, K. T., Hitlin, D. G., Kim, J., Li, Y., Lin, D. X., Miyashita, T. S., Ongmongkolkul, P., Oyang, J., Porter, F. C., Röhrken, M., Huard, Z., Meadows, B. T., Pushpawela, B. G., Sokoloff, M. D., Sun, L., Smith, J. G., Wagner, S. R., Bernard, D., Verderi, M., Bettoni, D., Bozzi, C., Calabrese, R., Cibinetto, G., Fioravanti, E., Garzia, I., Luppi, E., Santoro, V., Calcaterra, A., de Sangro, R., Finocchiaro, G., Martellotti, S., Patteri, P., Peruzzi, I. M., Piccolo, M., Rotondo, M., Zallo, A., Passaggio, S., Patrignani, C., Shuve, B. J., Lacker, H. M., Bhuyan, B., Mallik, U., Chen, C., Cochran, J., Prell, S., Gritsan, A. V., Arnaud, N., Davier, M., Le Diberder, F., Lutz, A. M., Wormser, G., Lange, D. J., Wright, D. M., Coleman, J. P., Gabathuler, E., Hutchcroft, D. E., Payne, D. J., Touramanis, C., Bevan, A. J., Di Lodovico, F., Sacco, R., Cowan, G., Banerjee, Sw
Format:	Artikel
Sprache:	eng
Schlagworte:	High Energy Physics - Experiment Physics
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Zusammenfassung:	We study the processes γγ → ηc → η′K+K- , η′π+π- , and ηπ+π- using a data sample of 519 fb-1 recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e+e- collider at center-of-mass energies at and near the ϒ ( nS ) ( n=2 , 3, 4) resonances. This is the first observation of the decay ηc → η′K+K- and we measure the branching fraction Γ ( ηc → η′K+K- ) / ( Γ ( ηc → η′π+π- ) = 0.644±0.039stat±0.032sys . Significant interference is observed between γγ → ηc → ηπ+π- and the nonresonant two-photon process γγ → ηπ+π- . A Dalitz plot analysis is performed of ηc decays to η′K+K- , η′π+π- , and ηπ+π- . Combined with our previous analysis of ηc → K K ¯ π , we measure the K0* ( 1430 ) parameters and the ratio between its η′K and πK couplings. The decay ηc → η′π+π- is dominated by the f0 ( 2100 ) resonance, also observed in J/ψ radiative decays. A new a0 ( 1700 ) → ηπ resonance is observed in the ηc → ηπ+π- channel. We also compare ηc decays to η and η′ final states in association with scalar mesons as they relate to the identification of the scalar glueball.
ISSN:	2470-0010 2470-0029
DOI:	10.1103/PhysRevD.104.072002