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

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

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作者：S.D. Yangasup> ; sup>shaodanyang@pku.edu.cn" class="auth_mail" title="E-mail the corresponding authorsup> ; 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 mmlsi1" class="mathmlsrc">mulatext stixSupport mathImg" 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">102×106sup>ϒ(1S)mathContainer hidden">mathCode"><math altimg="si1.gif" overflow="scroll"><mn>102mn><mo>×mo><msup><mrow><mn>10mn>mrow><mrow><mn>6mn>mrow>msup><mi mathvariant="normal">ϒmi><mo stretchy="false">(mo><mn>1mn><mi>Smi><mo stretchy="false">)mo>math> and mmlsi2" class="mathmlsrc">mulatext stixSupport mathImg" 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">158×106sup>ϒ(2S)mathContainer hidden">mathCode"><math altimg="si2.gif" overflow="scroll"><mn>158mn><mo>×mo><msup><mrow><mn>10mn>mrow><mrow><mn>6mn>mrow>msup><mi mathvariant="normal">ϒmi><mo stretchy="false">(mo><mn>2mn><mi>Smi><mo stretchy="false">)mo>math> events collected at Belle, several studies on mmlsi3" class="mathmlsrc">mulatext stixSupport mathImg" 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)mathContainer hidden">mathCode"><math altimg="si3.gif" overflow="scroll"><mi mathvariant="normal">ϒmi><mo stretchy="false">(mo><mn>1mn><mi>Smi><mo stretchy="false">/mo><mn>2mn><mi>Smi><mo stretchy="false">)mo>math> decays have been performed recently. Charge-parity-even charmonium(-like) states, such as mmlsi4" class="mathmlsrc">mulatext stixSupport mathImg" 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">χc0,1,2sub>mathContainer hidden">mathCode"><math altimg="si4.gif" overflow="scroll"><msub><mrow><mi>χmi>mrow><mrow><mi>cmi><mn>0mn><mo>,mo><mn>1mn><mo>,mo><mn>2mn>mrow>msub>math>, mmlsi5" class="mathmlsrc">mulatext stixSupport mathImg" 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">ηcsub>mathContainer hidden">mathCode"><math altimg="si5.gif" overflow="scroll"><msub><mrow><mi>ηmi>mrow><mrow><mi>cmi>mrow>msub>math>, m>Xm>(3872), m>Xm>(3915), m>Ym>(4140), and m>X m>(4350) (only in mmlsi6" class="mathmlsrc">mulatext stixSupport mathImg" 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)mathContainer hidden">mathCode"><math altimg="si6.gif" overflow="scroll"><mi mathvariant="normal">ϒmi><mo stretchy="false">(mo><mn>2mn><mi>Smi><mo stretchy="false">)mo>math> data), are first searched in mmlsi3" class="mathmlsrc">mulatext stixSupport mathImg" 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)mathContainer hidden">mathCode"><math altimg="si3.gif" overflow="scroll"><mi mathvariant="normal">ϒmi><mo stretchy="false">(mo><mn>1mn><mi>Smi><mo stretchy="false">/mo><mn>2mn><mi>Smi><mo stretchy="false">)mo>math> radiative decays, though there are no significant signals observed. Among double-charmonium final states from mmlsi3" class="mathmlsrc">mulatext stixSupport mathImg" 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)mathContainer hidden">mathCode"><math altimg="si3.gif" overflow="scroll"><mi mathvariant="normal">ϒmi><mo stretchy="false">(mo><mn>1mn><mi>Smi><mo stretchy="false">/mo><mn>2mn><mi>Smi><mo stretchy="false">)mo>math> exclusive decays, the evidence for mmlsi7" class="mathmlsrc">mulatext stixSupport mathImg" 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/ψχc1sub>mathContainer hidden">mathCode"><math altimg="si7.gif" overflow="scroll"><mi mathvariant="normal">ϒmi><mo stretchy="false">(mo><mn>1mn><mi>Smi><mo stretchy="false">)mo><mo stretchy="false">→mo><mi>Jmi><mo stretchy="false">/mo><mi>ψmi><msub><mrow><mi>χmi>mrow><mrow><mi>cmi><mn>1mn>mrow>msub>math> was found first with a signal significance of 4.6m>σm>, and the branching fraction was measured to be (3.90 ± 1.21(stat.) ± 0.23(syst.)) × 10-6sup>. 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 mmlsi8" class="mathmlsrc">mulatext stixSupport mathImg" 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+sup>K−sup>mathContainer hidden">mathCode"><math altimg="si8.gif" overflow="scroll"><mi mathvariant="normal">ϒmi><mo stretchy="false">(mo><mn>1mn><mi>Smi><mo stretchy="false">)mo><mo stretchy="false">→mo><mi>ϕmi><msup><mrow><mi>Kmi>mrow><mrow><mo>+mo>mrow>msup><msup><mrow><mi>Kmi>mrow><mrow><mo>−mo>mrow>msup>math>, mmlsi9" class="mathmlsrc">mulatext stixSupport mathImg" 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+sup>π−sup>mathContainer hidden">mathCode"><math altimg="si9.gif" overflow="scroll"><mi>ωmi><msup><mrow><mi>πmi>mrow><mrow><mo>+mo>mrow>msup><msup><mrow><mi>πmi>mrow><mrow><mo>−mo>mrow>msup>math>, mmlsi10" class="mathmlsrc">mulatext stixSupport mathImg" 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⁎sup>(892)0sup>K−sup>π+sup>mathContainer hidden">mathCode"><math altimg="si10.gif" overflow="scroll"><msup><mrow><mi>Kmi>mrow><mrow><mo>⁎mo>mrow>msup><msup><mrow><mo stretchy="false">(mo><mn>892mn><mo stretchy="false">)mo>mrow><mrow><mn>0mn>mrow>msup><msup><mrow><mi>Kmi>mrow><mrow><mo>−mo>mrow>msup><msup><mrow><mi>πmi>mrow><mrow><mo>+mo>mrow>msup>math>, mmlsi11" class="mathmlsrc">mathImg" 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">mg 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">

mg height="20" border="0" style="vertical-align:bottom" width="110" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S2405601416000262-si11.gif">

mathContainer hidden">mathCode"><math altimg="si11.gif" overflow="scroll"><msubsup><mrow><mi>Kmi>mrow><mrow><mi>Smi>mrow><mrow><mn>0mn>mrow>msubsup><msup><mrow><mi>Kmi>mrow><mrow><mo>+mo>mrow>msup><msup><mrow><mi>πmi>mrow><mrow><mo>−mo>mrow>msup><mo>+mo><mi>cmi><mo>.mo><mi>cmi><mo>.mo>math>, mmlsi12" class="mathmlsrc">mulatext stixSupport mathImg" 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+sup>π−sup>π0sup>π0sup>mathContainer hidden">mathCode"><math altimg="si12.gif" overflow="scroll"><msup><mrow><mi>πmi>mrow><mrow><mo>+mo>mrow>msup><msup><mrow><mi>πmi>mrow><mrow><mo>−mo>mrow>msup><msup><mrow><mi>πmi>mrow><mrow><mn>0mn>mrow>msup><msup><mrow><mi>πmi>mrow><mrow><mn>0mn>mrow>msup>math>, mmlsi13" class="mathmlsrc">mathImg" 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">mg 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">

mg height="20" border="0" style="vertical-align:bottom" width="137" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S2405601416000262-si13.gif">

mathContainer hidden">mathCode"><math altimg="si13.gif" overflow="scroll"><msup><mrow><mi>Kmi>mrow><mrow><mo>⁎mo>mrow>msup><msup><mrow><mo stretchy="false">(mo><mn>892mn><mo stretchy="false">)mo>mrow><mrow><mn>0mn>mrow>msup><msubsup><mrow><mover accent="true"><mrow><mi>Kmi>mrow><mo>‾mo>mover>mrow><mrow><mn>2mn>mrow><mrow><mo>⁎mo>mrow>msubsup><msup><mrow><mo stretchy="false">(mo><mn>1430mn><mo stretchy="false">)mo>mrow><mrow><mn>0mn>mrow>msup>math> and mmlsi14" class="mathmlsrc">mulatext stixSupport mathImg" 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+sup>K−sup>mathContainer hidden">mathCode"><math altimg="si14.gif" overflow="scroll"><mi mathvariant="normal">ϒmi><mo stretchy="false">(mo><mn>2mn><mi>Smi><mo stretchy="false">)mo><mo stretchy="false">→mo><mi>ϕmi><msup><mrow><mi>Kmi>mrow><mrow><mo>+mo>mrow>msup><msup><mrow><mi>Kmi>mrow><mrow><mo>−mo>mrow>msup>math>, mmlsi10" class="mathmlsrc">mulatext stixSupport mathImg" 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⁎sup>(892)0sup>K−sup>π+sup>mathContainer hidden">mathCode"><math altimg="si10.gif" overflow="scroll"><msup><mrow><mi>Kmi>mrow><mrow><mo>⁎mo>mrow>msup><msup><mrow><mo stretchy="false">(mo><mn>892mn><mo stretchy="false">)mo>mrow><mrow><mn>0mn>mrow>msup><msup><mrow><mi>Kmi>mrow><mrow><mo>−mo>mrow>msup><msup><mrow><mi>πmi>mrow><mrow><mo>+mo>mrow>msup>math>, mmlsi12" class="mathmlsrc">mulatext stixSupport mathImg" 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+sup>π−sup>π0sup>π0sup>mathContainer hidden">mathCode"><math altimg="si12.gif" overflow="scroll"><msup><mrow><mi>πmi>mrow><mrow><mo>+mo>mrow>msup><msup><mrow><mi>πmi>mrow><mrow><mo>−mo>mrow>msup><msup><mrow><mi>πmi>mrow><mrow><mn>0mn>mrow>msup><msup><mrow><mi>πmi>mrow><mrow><mn>0mn>mrow>msup>math> decay modes, and evidence is found for the modes of mmlsi15" class="mathmlsrc">mulatext stixSupport mathImg" 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+sup>π−sup>π0sup>mathContainer hidden">mathCode"><math altimg="si15.gif" overflow="scroll"><mi mathvariant="normal">ϒmi><mo stretchy="false">(mo><mn>1mn><mi>Smi><mo stretchy="false">)mo><mo stretchy="false">→mo><msup><mrow><mi>πmi>mrow><mrow><mo>+mo>mrow>msup><msup><mrow><mi>πmi>mrow><mrow><mo>−mo>mrow>msup><msup><mrow><mi>πmi>mrow><mrow><mn>0mn>mrow>msup>math>, mmlsi16" class="mathmlsrc">mulatext stixSupport mathImg" 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">K1sub>(1400)+sup>K−sup>mathContainer hidden">mathCode"><math altimg="si16.gif" overflow="scroll"><msub><mrow><mi>Kmi>mrow><mrow><mn>1mn>mrow>msub><msup><mrow><mo stretchy="false">(mo><mn>1400mn><mo stretchy="false">)mo>mrow><mrow><mo>+mo>mrow>msup><msup><mrow><mi>Kmi>mrow><mrow><mo>−mo>mrow>msup>math>, mmlsi17" class="mathmlsrc">mathImg" 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">mg 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">

mg height="18" border="0" style="vertical-align:bottom" width="128" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S2405601416000262-si17.gif">

mathContainer hidden">mathCode"><math altimg="si17.gif" overflow="scroll"><msup><mrow><mi>Kmi>mrow><mrow><mo>⁎mo>mrow>msup><msup><mrow><mo stretchy="false">(mo><mn>892mn><mo stretchy="false">)mo>mrow><mrow><mn>0mn>mrow>msup><msup><mrow><mover accent="true"><mrow><mi>Kmi>mrow><mo>‾mo>mover>mrow><mrow><mn>0mn>mrow>msup><mo>+mo><mi>cmi><mo>.mo><mi>cmi><mo>.mo>math> and mmlsi18" class="mathmlsrc">mathImg" 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">mg 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">

mg height="20" border="0" style="vertical-align:bottom" width="177" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S2405601416000262-si18.gif">

mathContainer hidden">mathCode"><math altimg="si18.gif" overflow="scroll"><mi mathvariant="normal">ϒmi><mo stretchy="false">(mo><mn>2mn><mi>Smi><mo stretchy="false">)mo><mo stretchy="false">→mo><msubsup><mrow><mi>Kmi>mrow><mrow><mi>Smi>mrow><mrow><mn>0mn>mrow>msubsup><msup><mrow><mi>Kmi>mrow><mrow><mo>+mo>mrow>msup><msup><mrow><mi>πmi>mrow><mrow><mo>−mo>mrow>msup><mo>+mo><mi>cmi><mo>.mo><mi>cmi><mo>.mo>math>, mmlsi13" class="mathmlsrc">mathImg" 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">mg 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">

mathContainer hidden">mathCode"><math altimg="si13.gif" overflow="scroll"><msup><mrow><mi>Kmi>mrow><mrow><mo>⁎mo>mrow>msup><msup><mrow><mo stretchy="false">(mo><mn>892mn><mo stretchy="false">)mo>mrow><mrow><mn>0mn>mrow>msup><msubsup><mrow><mover accent="true"><mrow><mi>Kmi>mrow><mo>‾mo>mover>mrow><mrow><mn>2mn>mrow><mrow><mo>⁎mo>mrow>msubsup><msup><mrow><mo stretchy="false">(mo><mn>1430mn><mo stretchy="false">)mo>mrow><mrow><mn>0mn>mrow>msup>math>. In addition, the study of the hadronic transitions, mmlsi19" class="mathmlsrc">mulatext stixSupport mathImg" 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,π0sup>)ϒ(1S)mathContainer hidden">mathCode"><math altimg="si19.gif" overflow="scroll"><mi mathvariant="normal">ϒmi><mo stretchy="false">(mo><mn>2mn><mi>Smi><mo stretchy="false">)mo><mo stretchy="false">→mo><mo stretchy="false">(mo><mi>ηmi><mo>,mo><msup><mrow><mi>πmi>mrow><mrow><mn>0mn>mrow>msup><mo stretchy="false">)mo><mi mathvariant="normal">ϒmi><mo stretchy="false">(mo><mn>1mn><mi>Smi><mo stretchy="false">)mo>math>, is performed, and mmlsi20" class="mathmlsrc">mulatext stixSupport mathImg" 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.))×106−4mathContainer hidden">mathCode"><math altimg="si20.gif" overflow="scroll"><mi mathvariant="script">Bmi><mo stretchy="false">(mo><mi mathvariant="normal">ϒmi><mo stretchy="false">(mo><mn>2mn><mi>Smi><mo stretchy="false">)mo><mo stretchy="false">→mo><mi>ηmi><mi mathvariant="normal">ϒmi><mo stretchy="false">(mo><mn>1mn><mi>Smi><mo stretchy="false">)mo><mo stretchy="false">)mo><mo>=mo><mo stretchy="false">(mo><mn>3.57mn><mo>±mo><mn>0.25mn><mo stretchy="false">(mo><mtext>stat.mtext><mo stretchy="false">)mo><mo>±mo><mn>0.21mn><mo stretchy="false">(mo><mtext>syst.mtext><mo stretchy="false">)mo><mo stretchy="false">)mo><mo>×mo><mn>106mn><mo>−mo><mn>4mn>math> and mmlsi21" class="mathmlsrc">mulatext stixSupport mathImg" 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)→π0sup>ϒ(1S))<4.1×10−5sup>mathContainer hidden">mathCode"><math altimg="si21.gif" overflow="scroll"><mi mathvariant="script">Bmi><mo stretchy="false">(mo><mi mathvariant="normal">ϒmi><mo stretchy="false">(mo><mn>2mn><mi>Smi><mo stretchy="false">)mo><mo stretchy="false">→mo><msup><mrow><mi>πmi>mrow><mrow><mn>0mn>mrow>msup><mi mathvariant="normal">ϒmi><mo stretchy="false">(mo><mn>1mn><mi>Smi><mo stretchy="false">)mo><mo stretchy="false">)mo><mo><mo><mn>4.1mn><mo>×mo><msup><mrow><mn>10mn>mrow><mrow><mo>−mo><mn>5mn>mrow>msup>math> (90%C.L.) are obtained.