Recent results on hadronic ϒ(1S/2S) decays at Belle

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• 作者：S.D. Yang^a ; ^{shaodanyang@pku.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; on behalf of Belle Collaboration
• 关键词：ϒ(1S/2S)ϒ(1S/2S) decays ; charmonium-(like) productions ; light hadrons ; hadronic transitions
• 刊名：Nuclear and Particle Physics Proceedings
• 出版年：2016
• 出版时间：January-March 2016
• 年：2016
• 卷：270-272
• 期：Complete
• 页码：118-122
• 全文大小：1558 K

文摘

Using the data samples of issn=24056014&md5=df4e134eb9c4380fef4529b06a36f4a3" title="Click to view the MathML source">102×10⁶ϒ(1S)$102\times {10}^6\mathrm{\Upsilon }(1S)$ and issn=24056014&md5=4ec495d1722d6aadf76dba9a664b6c45" title="Click to view the MathML source">158×10⁶ϒ(2S)$158\times {10}^6\mathrm{\Upsilon }(2S)$ events collected at Belle, several studies on issn=24056014&md5=b186ab51169e32ce99215ac38678f1dc" title="Click to view the MathML source">ϒ(1S/2S)$\mathrm{\Upsilon }(1S/2S)$ decays have been performed recently. Charge-parity-even charmonium(-like) states, such as issn=24056014&md5=414be7c32c1b4a0f3d3224e0d1f05fab" title="Click to view the MathML source">χ_c0,1,2${\chi }_{c0,1,2}$, issn=24056014&md5=afeb091a71b32094c4aa3798f61345fa" title="Click to view the MathML source">η_c${\eta }_c$, X(3872), X(3915), Y(4140), and X  (4350) (only in issn=24056014&md5=493bee732759cd2f3a064b1a4093a6c8" title="Click to view the MathML source">ϒ(2S)$\mathrm{\Upsilon }(2S)$ data), are first searched in issn=24056014&md5=b186ab51169e32ce99215ac38678f1dc" title="Click to view the MathML source">ϒ(1S/2S)$\mathrm{\Upsilon }(1S/2S)$ radiative decays, though there are no significant signals observed. Among double-charmonium final states from issn=24056014&md5=b186ab51169e32ce99215ac38678f1dc" title="Click to view the MathML source">ϒ(1S/2S)$\mathrm{\Upsilon }(1S/2S)$ exclusive decays, the evidence for issn=24056014&md5=059340f7a27dfe9b519ecc3da075e307" title="Click to view the MathML source">ϒ(1S)→J/ψχ_c1$\mathrm{\Upsilon }(1S)\to J/\psi {\chi }_{c1}$ was found first with a signal significance of 4.6σ, and the branching fraction was measured to be (3.90 ± 1.21(stat.) ± 0.23(syst.)) × 10^-6. Some exclusive light hadronic decays are also searched for the first time, including the intermediate vector-tensor, axial-vector-pseudoscaler, and vector-pseudoscaler processes. Signals are observed in the issn=24056014&md5=08919d3a32b227985e51e9c149271693" title="Click to view the MathML source">ϒ(1S)→ϕK⁺K⁻$\mathrm{\Upsilon }(1S)\to \varphi K^{+}{K}^{-}$, issn=24056014&md5=954aeebfe782a05feb9982bc7ae7c663" title="Click to view the MathML source">ωπ⁺π⁻$\omega {\pi }^{+}{\pi }^{-}$, issn=24056014&md5=6367e1ca29d561c40847ffd55aadee42" title="Click to view the MathML source">K^⁎(892)⁰K⁻π⁺$K^{⁎}{(892)}^0{K}^{-}{\pi }^{+}$, issn=24056014&md5=6e15139934f294d06d7d6593c7a6595a">$K_S^0{K}^{+}{\pi }^{-}+c.c.$, issn=24056014&md5=d3046b1c12ba7ef65646b03047cb343c" title="Click to view the MathML source">π⁺π⁻π⁰π⁰${\pi }^{+}{\pi }^{-}{\pi }^0{\pi }^0$, issn=24056014&md5=d4c9d1f2af667f4cbee2b573ab45271f">$K^{⁎}{(892)}^0{\bar{K}}_2^{⁎}{(1430)}^0$ and issn=24056014&md5=ba77d2fe89e9604b3fecb578da176e6f" title="Click to view the MathML source">ϒ(2S)→ϕK⁺K⁻$\mathrm{\Upsilon }(2S)\to \varphi K^{+}{K}^{-}$, issn=24056014&md5=6367e1ca29d561c40847ffd55aadee42" title="Click to view the MathML source">K^⁎(892)⁰K⁻π⁺$K^{⁎}{(892)}^0{K}^{-}{\pi }^{+}$, issn=24056014&md5=d3046b1c12ba7ef65646b03047cb343c" title="Click to view the MathML source">π⁺π⁻π⁰π⁰${\pi }^{+}{\pi }^{-}{\pi }^0{\pi }^0$ decay modes, and evidence is found for the modes of issn=24056014&md5=d2242c35d65ec59f3f57c3ea4c35d3c4" title="Click to view the MathML source">ϒ(1S)→π⁺π⁻π⁰$\mathrm{\Upsilon }(1S)\to {\pi }^{+}{\pi }^{-}{\pi }^0$, issn=24056014&md5=bd78ebb5a7ecdfbf8a5e9a8f495fc34b" title="Click to view the MathML source">K₁(1400)⁺K⁻$K_1{(1400)}^{+}{K}^{-}$, issn=24056014&md5=36bcad3d1c46400600a064412900655f">$K^{⁎}{(892)}^0{\bar{K}}^0+c.c.$ and issn=24056014&md5=26c7e65ad69221ec2e41eab1defeb17d">$\mathrm{\Upsilon }(2S)\to K_S^0{K}^{+}{\pi }^{-}+c.c.$, issn=24056014&md5=d4c9d1f2af667f4cbee2b573ab45271f">$K^{⁎}{(892)}^0{\bar{K}}_2^{⁎}{(1430)}^0$. In addition, the study of the hadronic transitions, issn=24056014&md5=2bb65433396d451df01a42e55e68fdb6" title="Click to view the MathML source">ϒ(2S)→(η,π⁰)ϒ(1S)$\mathrm{\Upsilon }(2S)\to (\eta ,{\pi }^0)\mathrm{\Upsilon }(1S)$, is performed, and issn=24056014&md5=ffbbb0b535e2f70308a2666434c48237" title="Click to view the MathML source">B(ϒ(2S)→ηϒ(1S))=(3.57±0.25(stat.)±0.21(syst.))×106−4$\mathcal{B}(\mathrm{\Upsilon }(2S)\to \eta \mathrm{\Upsilon }(1S))=(3.57\pm 0.25(\text{stat.})\pm 0.21(\text{syst.}))\times 106-4$ and issn=24056014&md5=22a2254e145ebad7b30f006d28fb3db8" title="Click to view the MathML source">B(ϒ(2S)→π⁰ϒ(1S))<4.1×10⁻⁵$\mathcal{B}(\mathrm{\Upsilon }(2S)\to {\pi }^0\mathrm{\Upsilon }(1S))<4.1\times {10}^{-5}$ (90%C.L.) are obtained.