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Measurement of $e^+e^- \to \gamma\chi_{cJ}$ via initial state radiation at Belle

The Belle collaboration Han, Y.L. ; Wang, X.L. ; Yuan, C.Z. ; et al.
Phys.Rev.D 92 (2015) 012011, 2015.
Inspire Record 1376480 DOI 10.17182/hepdata.73745

The process $e^+e^- \to \gamma\chi_{cJ}$ ($J$=1, 2) is studied via initial state radiation using 980 fb$^{-1}$ of data at and around the $\Upsilon(nS)$ ($n$=1, 2, 3, 4, 5) resonances collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. No significant signal is observed except from $\psi(2S)$ decays. Upper limits on the cross sections between $\sqrt{s}=3.80$ and $5.56~{\rm GeV}$ are determined at the 90% credibility level, which range from few pb to a few tens of pb. We also set upper limits on the decay rate of the vector charmonium [$\psi(4040$), $\psi(4160)$, and $\psi(4415)$] and charmoniumlike [$Y(4260)$, $Y(4360)$, and $Y(4660)$] states to $\gamma\chi_{cJ}$.

3 data tables
Table 1

Upper limits on the $e^+e^-\to \gamma\chi_{cJ}$ cross sections.

Table 2

Upper limits on $\Gamma_{ee} \times \mathcal{B}$ at the 90$\%$ C.L.

Table 3

Upper limits on branching fractions $\mathcal{B}(R \to \gamma \chi_{cJ})$ at the 90$\%$ C.L.


Amplitude analysis of e+e- => Y(nS)pi+pi- at sqrt(s)=10.865 GeV

The Belle collaboration Garmash, A. ; Bondar, A. ; Kuzmin, A. ; et al.
Phys.Rev.D 91 (2015) 072003, 2015.
Inspire Record 1283743 DOI 10.17182/hepdata.64697

We report results on studies of the e+e- annihilation into three-body Y(nS)pi+pi- (n=1,2,3) final states including measurements of cross sections and the full amplitude analysis. The cross sections measured at sqrt(s)=10.865 GeV and corrected for the initial state radiation are sigma(e+e-=>Y(1S)pi+pi-)=(2.27+-0.12+-0.14) pb, sigma(e+e-=>Y(2S)pi+pi-)=(4.07+-0.16+-0.45) pb, and sigma(e+e-=>Y(3S)pi+pi-)=(1.46+-0.09+-0.16) pb. Amplitude analysis of the three-body Y(nS)pi+pi- final states strongly favors I^G(J^P)=1^+(1^+) quantum-number assignments for the two bottomonium-like Zb+- states, recently observed in the Y(nS)pi+- and hb(mP)pi+- (m=1,2) decay channels. The results are obtained with a $121.4 1/fb data sample collected with the Belle detector at the KEKB asymmetric-energy e+e- collider.

9 data tables
Table 1

The measured cross section and visible cross section for the three-body transition E+ E- --> UPSILON(1S) PI+ PI-.

Table 2

The measured cross section and visible cross section for the three-body transition E+ E- --> UPSILON(2S) PI+ PI-.

Table 3

The measured cross section and visible cross section for the three-body transition E+ E- --> UPSILON(3S) PI+ PI-.

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