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Observation of the decay
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The mmlsi1" class="mathmlsrc">mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316302325&_mathId=si1.gif&_user=111111111&_pii=S0370269316302325&_rdoc=1&_issn=03702693&md5=3ace642fa170f76f54ddde3eaa0f9d48">mg class="imgLazyJSB inlineImage" height="18" width="60" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269316302325-si1.gif">mathContainer hidden">mathCode"><math altimg="si1.gif" overflow="scroll"><msubsup><mrow><mi>Λmi>mrow><mrow><mi>bmi>mrow><mrow><mn>0mn>mrow>msubsup><mo stretchy="false">→mo><mi>Λmi><mi>ϕmi>math> decay is observed using data corresponding to an integrated luminosity of mmlsi3" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316302325&_mathId=si3.gif&_user=111111111&_pii=S0370269316302325&_rdoc=1&_issn=03702693&md5=405ff4ba9285fdeaa8765bd025bcdfbb" title="Click to view the MathML source">3.0 fb&minus;1mathContainer hidden">mathCode"><math altimg="si3.gif" overflow="scroll"><mn>3.0mn><msup><mrow><mtext> fbmtext>mrow><mrow><mo>&minus;mo><mn>1mn>mrow>msup>math> recorded by the LHCb experiment. The decay proceeds at leading order via a mmlsi4" class="mathmlsrc">mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316302325&_mathId=si4.gif&_user=111111111&_pii=S0370269316302325&_rdoc=1&_issn=03702693&md5=0478a5da6ae961b8c054bb46a7348375">mg class="imgLazyJSB inlineImage" height="10" width="48" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269316302325-si4.gif">mathContainer hidden">mathCode"><math altimg="si4.gif" overflow="scroll"><mi>bmi><mo stretchy="false">→mo><mi>smi><mover accent="true"><mrow><mi>smi>mrow><mo>‾mo>mover><mi>smi>math> loop transition and is therefore sensitive to the possible presence of particles beyond the Standard Model. A first observation is reported with a significance of 5.9 standard deviations. The value of the branching fraction is measured to be mmlsi5" class="mathmlsrc">mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316302325&_mathId=si5.gif&_user=111111111&_pii=S0370269316302325&_rdoc=1&_issn=03702693&md5=69bac0455e71c4dce989969e9456293b">mg class="imgLazyJSB inlineImage" height="19" width="201" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269316302325-si5.gif">mathContainer hidden">mathCode"><math altimg="si5.gif" overflow="scroll"><mo stretchy="false">(mo><mn>5.18mn><mo>&plusmn;mo><mn>1.04mn><mo>&plusmn;mo><msubsup><mrow><mn>0.35mn>mrow><mrow><mspace width="0.2em">mspace><mo>&minus;mo><mn>0.62mn>mrow><mrow><mspace width="0.2em">mspace><mo>+mo><mn>0.67mn>mrow>msubsup><mo stretchy="false">)mo><mo>&times;mo><msup><mrow><mn>10mn>mrow><mrow><mo>&minus;mo><mn>6mn>mrow>msup>math>, where the first uncertainty is statistical, the second is systematic, and the third is related to external inputs. Triple-product asymmetries are measured to be consistent with zero.

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