Abstract
The first search for double charged charmoniumlike state production in ϒ(1S) and ϒ(2S) decays and in e+e− annihilation at s=10.52, 10.58, and 10.867 GeV is conducted using data collected with the Belle detector at the KEKB asymmetric energy electron-positron collider. No significant signals are observed in any of the studied modes, and the 90% credibility level upper limits on their product branching fractions in ϒ(1S) and ϒ(2S) decays [B(ϒ(1S,2S)→Zc+Zc(′)−)×B(Zc+→π++cc¯) (cc¯=J/ψ, χc1(1P), ψ(2S))] and the product of Born cross section and branching fraction for e+e−→Zc+Zc(′)− (σ(e+e−→Zc+Zc(′)−)×B(Zc+→π++cc¯)) at s=10.52, 10.58, and 10.867 GeV are determined. Here, Zc refers to the Zc(3900) and Zc(4200) observed in the πJ/ψ final state, the Zc1(4050) and Zc2(4250) in the πχc1(1P) final state, and the Zc(4050) and Zc(4430) in the πψ(2S) final state.3 MoreReceived 6 May 2018DOI:https://doi.org/10.1103/PhysRevD.97.112004Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Physical SystemsExotic mesonsQuarkoniaParticles & Fields
Highlights
In the past decade, many experiments, at both lepton and hadron colliders, reported evidence for a large number of new particles having exotic properties that are difficult to accommodate within the conventional quark model, especially those that couple to heavy quarkonium and have nonzero charge [1]
Zc refers to the Zcð3900Þ and Zcð4200Þ observed in the πJ=ψ final state, the Zc1ð4050Þ and Zc2ð4250Þ in the πχc1ð1PÞ final state, and the Zcð4050Þ and Zcð4430Þ in the πψð2SÞ final state
Many experiments, at both lepton and hadron colliders, reported evidence for a large number of new particles having exotic properties that are difficult to accommodate within the conventional quark model, especially those that couple to heavy quarkonium and have nonzero charge [1]
Summary
Many experiments, at both lepton and hadron colliders, reported evidence for a large number of new particles having exotic properties that are difficult to accommodate within the conventional quark model, especially those that couple to heavy quarkonium and have nonzero charge [1]. Considerable efforts in theory have been devoted to interpreting these states as tetraquarks, molecules, hybrids, or hadrocharmonia [11–13] To distinguish among these explanations, experimental input is needed, such as that from the study of double ZÆc production in eþe− annihilation [14,15]. Zdeþcnðo4t0e5s0ÞZ, þcoðr39Z0þc0Þð,44Z30þcÞð.42In00Þth, esZeþc1sðe4a0r5c0hÞe,s, Zþc2ð4250Þ, the decay modes considered are Zþc ð3900Þ=Zþc ð4200Þ → πþJ=ψ, ZZþcþc1ðð44403500ÞÞ=→Zþcπ2þð4ψ2ð520SÞÞ→[1π6þ].χ c1ð1PÞ, and it is. Zc states, only both Zc states decaying into the same final states are currently studied in this study; the information of the other final-state combinations can be estimated from the results reported here
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