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 g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si1.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=df4e134eb9c4380fef4529b06a36f4a3" title="Click to view the MathML source">102×10⁶ϒ(1S)tainer hidden">gif" overflow="scroll">102×106variant="normal">ϒ(1S) and g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si2.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=4ec495d1722d6aadf76dba9a664b6c45" title="Click to view the MathML source">158×10⁶ϒ(2S)tainer hidden">gif" overflow="scroll">158×106variant="normal">ϒ(2S) events collected at Belle, several studies on g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si3.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=b186ab51169e32ce99215ac38678f1dc" title="Click to view the MathML source">ϒ(1S/2S)tainer hidden">gif" overflow="scroll">variant="normal">ϒ(1S/2S) decays have been performed recently. Charge-parity-even charmonium(-like) states, such as g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si4.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=414be7c32c1b4a0f3d3224e0d1f05fab" title="Click to view the MathML source">χ_c0,1,2tainer hidden">gif" overflow="scroll">χc0,1,2, g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si5.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=afeb091a71b32094c4aa3798f61345fa" title="Click to view the MathML source">η_ctainer hidden">gif" overflow="scroll">ηc, X(3872), X(3915), Y(4140), and X  (4350) (only in g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si6.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=493bee732759cd2f3a064b1a4093a6c8" title="Click to view the MathML source">ϒ(2S)tainer hidden">gif" overflow="scroll">variant="normal">ϒ(2S) data), are first searched in g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si3.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=b186ab51169e32ce99215ac38678f1dc" title="Click to view the MathML source">ϒ(1S/2S)tainer hidden">gif" overflow="scroll">variant="normal">ϒ(1S/2S) radiative decays, though there are no significant signals observed. Among double-charmonium final states from g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si3.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=b186ab51169e32ce99215ac38678f1dc" title="Click to view the MathML source">ϒ(1S/2S)tainer hidden">gif" overflow="scroll">variant="normal">ϒ(1S/2S) exclusive decays, the evidence for g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si7.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=059340f7a27dfe9b519ecc3da075e307" title="Click to view the MathML source">ϒ(1S)→J/ψχ_c1tainer hidden">gif" overflow="scroll">variant="normal">ϒ(1S)→J/ψχc1 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 g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si8.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=08919d3a32b227985e51e9c149271693" title="Click to view the MathML source">ϒ(1S)→ϕK⁺K⁻tainer hidden">gif" overflow="scroll">variant="normal">ϒ(1S)→ϕK+K−, g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si9.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=954aeebfe782a05feb9982bc7ae7c663" title="Click to view the MathML source">ωπ⁺π⁻tainer hidden">gif" overflow="scroll">ωπ+π−, g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si10.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=6367e1ca29d561c40847ffd55aadee42" title="Click to view the MathML source">K^⁎(892)⁰K⁻π⁺tainer hidden">gif" overflow="scroll">K⁎(892)0K−π+, g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si11.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=6e15139934f294d06d7d6593c7a6595a">g class="imgLazyJSB inlineImage" height="20" width="110" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S2405601416000262-si11.gif">tainer hidden">gif" overflow="scroll">KS0K+π−+c.c., g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si12.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=d3046b1c12ba7ef65646b03047cb343c" title="Click to view the MathML source">π⁺π⁻π⁰π⁰tainer hidden">gif" overflow="scroll">π+π−π0π0, g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si13.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=d4c9d1f2af667f4cbee2b573ab45271f">g class="imgLazyJSB inlineImage" height="20" width="137" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S2405601416000262-si13.gif">tainer hidden">gif" overflow="scroll">K⁎(892)0ver accent="true">K‾ver>2⁎(1430)0 and g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si14.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=ba77d2fe89e9604b3fecb578da176e6f" title="Click to view the MathML source">ϒ(2S)→ϕK⁺K⁻tainer hidden">gif" overflow="scroll">variant="normal">ϒ(2S)→ϕK+K−, g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si10.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=6367e1ca29d561c40847ffd55aadee42" title="Click to view the MathML source">K^⁎(892)⁰K⁻π⁺tainer hidden">gif" overflow="scroll">K⁎(892)0K−π+, g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si12.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=d3046b1c12ba7ef65646b03047cb343c" title="Click to view the MathML source">π⁺π⁻π⁰π⁰tainer hidden">gif" overflow="scroll">π+π−π0π0 decay modes, and evidence is found for the modes of g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si15.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=d2242c35d65ec59f3f57c3ea4c35d3c4" title="Click to view the MathML source">ϒ(1S)→π⁺π⁻π⁰tainer hidden">gif" overflow="scroll">variant="normal">ϒ(1S)→π+π−π0, g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si16.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=bd78ebb5a7ecdfbf8a5e9a8f495fc34b" title="Click to view the MathML source">K₁(1400)⁺K⁻tainer hidden">gif" overflow="scroll">K1(1400)+K−, g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si17.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=36bcad3d1c46400600a064412900655f">g class="imgLazyJSB inlineImage" height="18" width="128" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S2405601416000262-si17.gif">tainer hidden">gif" overflow="scroll">K⁎(892)0ver accent="true">K‾ver>0+c.c. and g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si18.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=26c7e65ad69221ec2e41eab1defeb17d">g class="imgLazyJSB inlineImage" height="20" width="177" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S2405601416000262-si18.gif">tainer hidden">gif" overflow="scroll">variant="normal">ϒ(2S)→KS0K+π−+c.c., g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si13.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=d4c9d1f2af667f4cbee2b573ab45271f">g class="imgLazyJSB inlineImage" height="20" width="137" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S2405601416000262-si13.gif">tainer hidden">gif" overflow="scroll">K⁎(892)0ver accent="true">K‾ver>2⁎(1430)0. In addition, the study of the hadronic transitions, g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si19.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=2bb65433396d451df01a42e55e68fdb6" title="Click to view the MathML source">ϒ(2S)→(η,π⁰)ϒ(1S)tainer hidden">gif" overflow="scroll">variant="normal">ϒ(2S)→(η,π0)variant="normal">ϒ(1S), is performed, and g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si20.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=ffbbb0b535e2f70308a2666434c48237" title="Click to view the MathML source">B(ϒ(2S)→ηϒ(1S))=(3.57±0.25(stat.)±0.21(syst.))×106−4tainer hidden">gif" overflow="scroll">variant="script">B(variant="normal">ϒ(2S)→ηvariant="normal">ϒ(1S))=(3.57±0.25(stat.)±0.21(syst.))×106−4 and g" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S2405601416000262&_mathId=si21.gif&_user=111111111&_pii=S2405601416000262&_rdoc=1&_issn=24056014&md5=22a2254e145ebad7b30f006d28fb3db8" title="Click to view the MathML source">B(ϒ(2S)→π⁰ϒ(1S))<4.1×10⁻⁵tainer hidden">gif" overflow="scroll">variant="script">B(variant="normal">ϒ(2S)→π0variant="normal">ϒ(1S))<4.1×10−5 (90%C.L.) are obtained.