Another tetraquark structure in the π + χ c 1 invariant mass distribution
نویسنده
چکیده
In this article, we assume that the mesons in the πχc1 invariant mass distribution are scalar hidden charmed tetraquark states and study their masses with the QCD sum rules. The numerical result indicates that the mass is about MZ = (4.19 ± 0.17)GeV, which is consistent with the experimental data. The hidden charmed mesons Z1 and Z2 may be tetraquark states, other possibilities, such as hadro-charmonium resonances, P -wave D+D̄0 molecular states, and D 1 D̄ 0 +D+D̄0 1 molecular states are not excluded. PACS number: 12.39.Mk, 12.38.Lg
منابع مشابه
A ug 2 00 8 Another tetraquark structure in the π + χ c 1 invariant mass distribution
In this article, we assume that the mesons in the πχc1 invariant mass distribution are scalar hidden charmed tetraquark states and calculate their masses with the QCD sum rules. The numerical result indicates that the masses are about MZ = (4.48 ± 0.12)GeV. In previous work, we observe that the masses of the vector hidden charmed tetraquark states are about MZ = (4.81±0.11)GeV or MZ = (4.83±0.1...
متن کاملar X iv : 0 80 7 . 45 92 v 1 [ he p - ph ] 2 9 Ju l 2 00 8 Another tetraquark structure in the π + χ c 1 invariant mass distribution Zhi -
In this article, we interpolate the vector hidden charmed tetraquark state with the Cγ5 − Cγμγ5 type current, and calculate its mass with the QCD sum rules. The numerical result indicates that the mass is about MZ = (4.09 ± 0.11)GeV, while the C − Cγμ type interpolating current leads to the mass aboutMZ = (4.22±0.10)GeV; they are consistent with the experimental data on the πχc1 invariant mass ...
متن کاملar X iv : 0 80 7 . 25 81 v 1 [ he p - ph ] 1 6 Ju l 2 00 8 Possible tetraquark state in the π + χ c 1 invariant mass distribution Zhi -
In this article, we take the point of view that there exists a hidden charmed tetraquark state with spin-parity J = 1, and calculate its mass with the QCD sum rules. The numerical result indicates that the mass of the vector hidden charmed tetraquark state is about MZ = (4.22 ± 0.10)GeV, which is consistent with the experimental data on the πχc1 invariant mass distribution. The hidden charmed m...
متن کاملPossibility of Exotic States in the Upsilon system
Recent data from Belle show unusually large partial widths Υ(5S) → Υ(1S)ππ and Υ(5S) → Υ(2S)ππ. The Z(4430) narrow resonance also reported by Belle in ψπ spectrum has the properties expected of a c̄cud̄ charged isovector tetraquark T c̄c . The analogous state T b̄b in the bottom sector might mediate anomalously large cascade decays in the Upsilon system, Υ(mS) → T b̄b π → Υ(nS)ππ, with a tetraquark-...
متن کاملf 0 ( 500 ) , f 0 ( 980 ) , and a 0 ( 980 ) production in the χ c 1 → ηπ + π − reaction
We study the χc1 → ηπ+π− decay, paying attention to the production of f0(500), f0(980), and a0(980) from the final state interaction of pairs of mesons that can lead to these three mesons in the final state, which is implemented using the chiral unitary approach. Very clean and strong signals are obtained for the a0(980) excitation in the ηπ invariant mass distribution and for the f0(500) in th...
متن کامل