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Observation of the decay
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The rc">rce" class="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">View the MathML sou<font color=rce" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269316302325-si1.gif">ript>rder="0" style="vertical-align:bottom" width="60" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269316302325-si1.gif">ript>r hidden">rflow="scroll">row>Λrow>row>brow>row>0row>retchy="false">&rarr;Λϕ decay is observed using data corresponding to an integrated luminosity of rc">rmulatext 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−1r hidden">rflow="scroll">3.0row> fbrow>row>1row> recorded by the LHCb experiment. The decay proceeds at leading order via a rc">rce" class="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">View the MathML sou<font color=rce" 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">ript>rder="0" style="vertical-align:bottom" width="48" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269316302325-si4.gif">ript>r hidden">rflow="scroll">bretchy="false">&rarr;sr accent="true">row>srow>r>s 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 rc">rce" class="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">View the MathML sou<font color=rce" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269316302325-si5.gif">ript>rder="0" style="vertical-align:bottom" width="201" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0370269316302325-si5.gif">ript>r hidden">rflow="scroll">retchy="false">(5.18±1.04±row>0.35row>row>0.62row>row>+0.67row>retchy="false">)×row>10row>row>6row>, 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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